timer

Afterburner · Dec 16, 2003

To start with I purchased a window air
conditioner and installed it in a wall. It is very
difficult to remove and work on. It is important that
the a/c runs two hours a day to reduce humidity.The
previous a/c worked with an on/off switch. As a result
I could connect it to a mechanical timer and it would
turn on and off at certain times.
The new a/c has a key pad and a remote, but to my
dismay when I hooked it up to the timer it would not
start; a button on the keypad had to be physically
pushed to turn it on, or turned on by a TV type remote.
I found that I could wire into the remote and close
the remote circuit and the IR would trigger the a/c to
operate. I used a micro switch on a mechanical timer
to close the circuit and turn the a/c on and off.
This system works fine, except if the power goes off,
the timer can go out of sync and run for 22 hours day after day.
Long route to get to the point:
I need a circuit (or conversion) that will close the remote's circuit twice
a day that is battery operated (C cell or D cell). I was hoping someone
would have a diagram and/or a suggest on the conversion of a timer.
TUVM
Afterburner

Michael A. Terrell · Dec 17, 2003

Afterburner wrote:

To start with I purchased a window air
conditioner and installed it in a wall. It is very
difficult to remove and work on. It is important that
the a/c runs two hours a day to reduce humidity.The
previous a/c worked with an on/off switch. As a result
I could connect it to a mechanical timer and it would
turn on and off at certain times.
The new a/c has a key pad and a remote, but to my
dismay when I hooked it up to the timer it would not
start; a button on the keypad had to be physically
pushed to turn it on, or turned on by a TV type remote.
I found that I could wire into the remote and close
the remote circuit and the IR would trigger the a/c to
operate. I used a micro switch on a mechanical timer
to close the circuit and turn the a/c on and off.
This system works fine, except if the power goes off,
the timer can go out of sync and run for 22 hours day after day.
Long route to get to the point:
I need a circuit (or conversion) that will close the remote's circuit twice
a day that is battery operated (C cell or D cell). I was hoping someone
would have a diagram and/or a suggest on the conversion of a timer.
TUVM
Afterburner

Connect a relay from the timer to pulse the remote's power button.
--
9 days!

Michael A. Terrell
Central Florida

Ken Taylor · Dec 17, 2003

"Afterburner" <afterburner1@sbcglobal.net> wrote in message
news:Z0LDb.1218$N%5.434243788@newssvr11.news.prodigy.com...

To start with I purchased a window air
conditioner and installed it in a wall. It is very
difficult to remove and work on. It is important that
the a/c runs two hours a day to reduce humidity.The
previous a/c worked with an on/off switch. As a result
I could connect it to a mechanical timer and it would
turn on and off at certain times.
The new a/c has a key pad and a remote, but to my
dismay when I hooked it up to the timer it would not
start; a button on the keypad had to be physically
pushed to turn it on, or turned on by a TV type remote.
I found that I could wire into the remote and close
the remote circuit and the IR would trigger the a/c to
operate. I used a micro switch on a mechanical timer
to close the circuit and turn the a/c on and off.
This system works fine, except if the power goes off,
the timer can go out of sync and run for 22 hours day after day.
Long route to get to the point:
I need a circuit (or conversion) that will close the remote's circuit
twice
a day that is battery operated (C cell or D cell). I was hoping someone
would have a diagram and/or a suggest on the conversion of a timer.
TUVM
Afterburner

Make/model of aircon?

Ken

WEBPA · Dec 17, 2003

To start with I purchased a window air
conditioner and installed it in a wall. It is very
difficult to remove and work on. It is important that
the a/c runs two hours a day to red.....

Look for a programmable ("learning") IR remote control with a "timer" function.
I've seen them in various brands for <US$30. If necessary, power the remote
with D-cell(s) for a couple of years. Note that the remote's timer is then
independent of mains outages..

webpa

afterburner · Dec 19, 2003

"Ken Taylor" <ken123@xtra.co.nz> wrote in message news:<brocmm$5peno$1@ID-76636.news.uni-berlin.de>...

"Afterburner" <afterburner1@sbcglobal.net> wrote in message
news:Z0LDb.1218$N%5.434243788@newssvr11.news.prodigy.com...
To start with I purchased a window air
conditioner and installed it in a wall. It is very
difficult to remove and work on. It is important that
the a/c runs two hours a day to reduce humidity.The
previous a/c worked with an on/off switch. As a result
I could connect it to a mechanical timer and it would
turn on and off at certain times.
The new a/c has a key pad and a remote, but to my
dismay when I hooked it up to the timer it would not
start; a button on the keypad had to be physically
pushed to turn it on, or turned on by a TV type remote.
I found that I could wire into the remote and close
the remote circuit and the IR would trigger the a/c to
operate. I used a micro switch on a mechanical timer
to close the circuit and turn the a/c on and off.
This system works fine, except if the power goes off,
the timer can go out of sync and run for 22 hours day after day.
Long route to get to the point:
I need a circuit (or conversion) that will close the remote's circuit
twice
a day that is battery operated (C cell or D cell). I was hoping someone
would have a diagram and/or a suggest on the conversion of a timer.
TUVM
Afterburner

Make/model of aircon?

Ken

Model a/c is Maytag 12000 btu, window installation with heat. Model
number is in Florida,;I'm in Houston. Unit cost was $500.00, Home
Depot.

afterburner · Dec 19, 2003

webpa@aol.com (WEBPA) wrote in message news:<20031217093308.19816.00000415@mb-m01.aol.com>...

To start with I purchased a window air
conditioner and installed it in a wall. It is very
difficult to remove and work on. It is important that
the a/c runs two hours a day to red.....

Look for a programmable ("learning") IR remote control with a "timer" function.
I've seen them in various brands for <US$30. If necessary, power the remote
with D-cell(s) for a couple of years. Note that the remote's timer is then
independent of mains outages..

webpa

This sounds like a "brillant" solution, but I have never heard of a
timer on a programable remote. Give me a clue where to look for this
item. TUVM Afterburner

WEBPA · Dec 19, 2003

webpa@aol.com (WEBPA) wrote in message
news:<20031217093308.19816.00000415@mb-m01.aol.com>...
To start with I purchased a window air
conditioner and installed it in a wall. It is very
difficult to remove and work on. It is important that
the a/c runs two hours a day to red.....

Look for a programmable ("learning") IR remote control with a "timer"
function.
I've seen them in various brands for <US$30. If necessary, power the
remote
with D-cell(s) for a couple of years. Note that the remote's timer is then
independent of mains outages..

webpa

This sounds like a "brillant" solution, but I have never heard of a
timer on a programable remote. Give me a clue where to look for this
item. TUVM Afterburner

The one I'm currently using is a "RCA Home Theater Universal Remote; 8-Device",

Model RCU-810A. Cost US$50 at Best Buy in August, 2000. This is a "learning"
remote with a lot more functions that you need for your AC; I'm sure there are
simpler ones. In fact, I've seen TV adverts for a "remote for dummies" that has
two large clock-style dials on it that can work TVs and VCRs even if "flashing
12:00".

Best Buy, Circuit City, WalMart...etc. are likely to have similar current
models.
webpa

afterburner · Dec 20, 2003

"Ken Taylor" <ken123@xtra.co.nz> wrote in message news:<brocmm$5peno$1@ID-76636.news.uni-berlin.de>...

"Afterburner" <afterburner1@sbcglobal.net> wrote in message
news:Z0LDb.1218$N%5.434243788@newssvr11.news.prodigy.com...
To start with I purchased a window air
conditioner and installed it in a wall. It is very
difficult to remove and work on. It is important that
the a/c runs two hours a day to reduce humidity.The
previous a/c worked with an on/off switch. As a result
I could connect it to a mechanical timer and it would
turn on and off at certain times.
The new a/c has a key pad and a remote, but to my
dismay when I hooked it up to the timer it would not
start; a button on the keypad had to be physically
pushed to turn it on, or turned on by a TV type remote.
I found that I could wire into the remote and close
the remote circuit and the IR would trigger the a/c to
operate. I used a micro switch on a mechanical timer
to close the circuit and turn the a/c on and off.
This system works fine, except if the power goes off,
the timer can go out of sync and run for 22 hours day after day.
Long route to get to the point:
I need a circuit (or conversion) that will close the remote's circuit
twice
a day that is battery operated (C cell or D cell). I was hoping someone
would have a diagram and/or a suggest on the conversion of a timer.
TUVM
Afterburner

Make/model of aircon?

Ken

Thought I answered this question, but it didn't get on line: It's a
Maytag 12000 Btu with heater, costs $500 at Home Depot. Serial number
and unit is in Florida; I'm in Houston.

afterburner · Dec 20, 2003

webpa@aol.com (WEBPA) wrote in message news:<20031219103919.26136.00001150@mb-m15.aol.com>...

webpa@aol.com (WEBPA) wrote in message
news:<20031217093308.19816.00000415@mb-m01.aol.com>...
To start with I purchased a window air
conditioner and installed it in a wall. It is very
difficult to remove and work on. It is important that
the a/c runs two hours a day to red.....

Look for a programmable ("learning") IR remote control with a "timer"
function.
I've seen them in various brands for <US$30. If necessary, power the
remote
with D-cell(s) for a couple of years. Note that the remote's timer is then
independent of mains outages..

webpa

This sounds like a "brillant" solution, but I have never heard of a
timer on a programable remote. Give me a clue where to look for this
item. TUVM Afterburner

The one I'm currently using is a "RCA Home Theater Universal Remote; 8-Device",
Model RCU-810A. Cost US$50 at Best Buy in August, 2000. This is a "learning"
remote with a lot more functions that you need for your AC; I'm sure there are
simpler ones. In fact, I've seen TV adverts for a "remote for dummies" that has
two large clock-style dials on it that can work TVs and VCRs even if "flashing
12:00".

Best Buy, Circuit City, WalMart...etc. are likely to have similar current
models.
webpa

Tried to answer you by email, but no luck.
When the A/C shuts down after the cycle it will not turn on again
unless the start button on the pad is pushed or the remote is
activated. I activate the remote with an AC electrical timer that
closes a micro switch, mecanically, This switch closes the start
circuit on the remote and the remote turns on the A/C. In about two
hours the timer trips the microswitch and turns the A/C off. The
microswitch is bolted to the timer and the little green and red nubs
close and open the microswitch as the timer rotates. Not rocket
science just a $5.00 timer and a $1.00 microswitch. Works fine except
if the power goes out, it goes out of sync.
Are you telling me that rcu-810A comes on automatically every day and
would start and stop the Air conditioner functioning similar to the
the electromechanical setup I have now? I tuvm for your comments.

John Fields · Dec 20, 2003

On Tue, 16 Dec 2003 21:44:25 GMT, "Afterburner"
<afterburner1@sbcglobal.net> wrote:

To start with I purchased a window air
conditioner and installed it in a wall. It is very
difficult to remove and work on. It is important that
the a/c runs two hours a day to reduce humidity.The
previous a/c worked with an on/off switch. As a result
I could connect it to a mechanical timer and it would
turn on and off at certain times.
The new a/c has a key pad and a remote, but to my
dismay when I hooked it up to the timer it would not
start; a button on the keypad had to be physically
pushed to turn it on, or turned on by a TV type remote.
I found that I could wire into the remote and close
the remote circuit and the IR would trigger the a/c to
operate. I used a micro switch on a mechanical timer
to close the circuit and turn the a/c on and off.
This system works fine, except if the power goes off,
the timer can go out of sync and run for 22 hours day after day.
Long route to get to the point:
I need a circuit (or conversion) that will close the remote's circuit twice
a day that is battery operated (C cell or D cell). I was hoping someone
would have a diagram and/or a suggest on the conversion of a timer.

---
Cute problem.

Sounds like if the AC mains go off while the AC is on for its 2 hour
dehumidifying run and then the mains come back on before the remote
issues the OFF pulse, the AC won't come back on immediately when the
mains come back up, but will wait until it gets the OFF pulse from the
rempte, which it will interpret as an ON pulse and then turn on and run
until it gets the next pulse 22 hours later, go off for two hours and
then go back on for 22, no?

As I see it, there are basically two routes you can take to arrive at a
solution, the first being to put some smarts into the circuitry that's
running the remote, and the second being to put some extra smarts into
the AC itself. Since the AC is already wired to the mains and there
needs to be some awareness of what the mains are doing/have done, I'd
be tempted to start there insted of having to make the circuitry driving
the remote mains-aware. But since you say the AC is a beast to work
on, rigging the remote may well be the best way to go.

First, since you want something to keep time independently of what the
mains is doing you'll need a (crystal-controlled?) timer that runs on
batteries or runs off the mains and switches over to batteries in case
of mains failure. If you use the switchover scheme you can make the
batteries last for a _long_ time.

There are only five possible combinations of mains ON/OFF occurrences
interacting with timer ON/OFF siganls, only two of which result in
permanent ON/OFF time reversals:

First, normal operation:

____________________________________________
MAINS
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
______ ______
AC _____| ON |____OFF_____| ON |_____OFF____

Second, an ON/OFF time reversal occurs when a mains failure and
subsequent recovery brackets the timer's ON pulse:

___ ____________________________________
MAINS |___|
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
_____ ____________ __________
AC __X__|__OFF__| ON |__OFF__| ON

Third, an ON/OFF time reversal occurs when a mains failure occurs and
subsequent recovery occurs between the timer's ON and OFF pulses:

________ _________________________________
MAINS |_|
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
_________ ____________ __________
AC __X__|_X_|___| ON |__OFF__| ON

Fourth, when a mains failure and subsequent recovery brackets the
timer's OFF pulse, an ON/OFF time reversal doesn't occur.

_________ __________________________
MAINS |_______|
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
_________ _______
AC ___X_|_X_|______OFF_______| ON |___OFF____

Fifth, when a mains failure and subsequent recovery falls between the
timer's ON and OFF pulses, an ON/OFF time reversal doesn't occur.

________________ ____________________
MAINS |______|
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
_________________ _______
AC __X__|__X____|_X_|__OFF___| ON |___OFF____

Since we need only concern ourselves with the mains failures which cause
ON/OFF time reversals, we need only concern ourselves with the instance
where the mains failure and recovery brackets the timer's ON pulse and
with the instance when the mains failure and recovery occurs between the
timer's ON and OFF pulses.

With that in mind, we should be able to devise a strategy which will
keep the OFF pulse from turning ON the AC. Examining the timing
diagrams above makes it evident that the only time we'll run into
trouble is when a mains failure occurs and its recovery is followed by a
timer OFF pulse, so if we can suppress that next OFF pulse and allow the
ON pulse following that to turn on the AC and enable the following OFF
pulse(s), that ought to work.

IMO, the easiest way to do the whole thing would be to find out what the
remote was sending as an ON/OFF signal, then use a ľC to generate that
sequence and do everything else as well. To do it all in hardware and
get a contact closure to do the switching at the remote is pretty
straightforward, albeit somewhat time-consuming, but it might be fun and
I can help you with circuit design and schematics if you like...

--
John Fields

Robert Monsen · Dec 21, 2003

"John Fields" <jfields@austininstruments.com> wrote in message
news:ida9uvk6eed1eqfik11b1092eenu99t7kb@4ax.com...

On Tue, 16 Dec 2003 21:44:25 GMT, "Afterburner"
afterburner1@sbcglobal.net> wrote:

To start with I purchased a window air
conditioner and installed it in a wall. It is very
difficult to remove and work on. It is important that
the a/c runs two hours a day to reduce humidity.The
previous a/c worked with an on/off switch. As a result
I could connect it to a mechanical timer and it would
turn on and off at certain times.
The new a/c has a key pad and a remote, but to my
dismay when I hooked it up to the timer it would not
start; a button on the keypad had to be physically
pushed to turn it on, or turned on by a TV type remote.
I found that I could wire into the remote and close
the remote circuit and the IR would trigger the a/c to
operate. I used a micro switch on a mechanical timer
to close the circuit and turn the a/c on and off.
This system works fine, except if the power goes off,
the timer can go out of sync and run for 22 hours day after day.
Long route to get to the point:
I need a circuit (or conversion) that will close the remote's circuit
twice
a day that is battery operated (C cell or D cell). I was hoping someone
would have a diagram and/or a suggest on the conversion of a timer.

---
Cute problem.

Sounds like if the AC mains go off while the AC is on for its 2 hour
dehumidifying run and then the mains come back on before the remote
issues the OFF pulse, the AC won't come back on immediately when the
mains come back up, but will wait until it gets the OFF pulse from the
rempte, which it will interpret as an ON pulse and then turn on and run
until it gets the next pulse 22 hours later, go off for two hours and
then go back on for 22, no?

As I see it, there are basically two routes you can take to arrive at a
solution, the first being to put some smarts into the circuitry that's
running the remote, and the second being to put some extra smarts into
the AC itself. Since the AC is already wired to the mains and there
needs to be some awareness of what the mains are doing/have done, I'd
be tempted to start there insted of having to make the circuitry driving
the remote mains-aware. But since you say the AC is a beast to work
on, rigging the remote may well be the best way to go.

First, since you want something to keep time independently of what the
mains is doing you'll need a (crystal-controlled?) timer that runs on
batteries or runs off the mains and switches over to batteries in case
of mains failure. If you use the switchover scheme you can make the
batteries last for a _long_ time.

There are only five possible combinations of mains ON/OFF occurrences
interacting with timer ON/OFF siganls, only two of which result in
permanent ON/OFF time reversals:

First, normal operation:

____________________________________________
MAINS
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
______ ______
AC _____| ON |____OFF_____| ON |_____OFF____

Second, an ON/OFF time reversal occurs when a mains failure and
subsequent recovery brackets the timer's ON pulse:

___ ____________________________________
MAINS |___|
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
_____ ____________ __________
AC __X__|__OFF__| ON |__OFF__| ON

Third, an ON/OFF time reversal occurs when a mains failure occurs and
subsequent recovery occurs between the timer's ON and OFF pulses:

________ _________________________________
MAINS |_|
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
_________ ____________ __________
AC __X__|_X_|___| ON |__OFF__| ON

Fourth, when a mains failure and subsequent recovery brackets the
timer's OFF pulse, an ON/OFF time reversal doesn't occur.

_________ __________________________
MAINS |_______|
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
_________ _______
AC ___X_|_X_|______OFF_______| ON |___OFF____

Fifth, when a mains failure and subsequent recovery falls between the
timer's ON and OFF pulses, an ON/OFF time reversal doesn't occur.

________________ ____________________
MAINS |______|
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
_________________ _______
AC __X__|__X____|_X_|__OFF___| ON |___OFF____

Since we need only concern ourselves with the mains failures which cause
ON/OFF time reversals, we need only concern ourselves with the instance
where the mains failure and recovery brackets the timer's ON pulse and
with the instance when the mains failure and recovery occurs between the
timer's ON and OFF pulses.

With that in mind, we should be able to devise a strategy which will
keep the OFF pulse from turning ON the AC. Examining the timing
diagrams above makes it evident that the only time we'll run into
trouble is when a mains failure occurs and its recovery is followed by a
timer OFF pulse, so if we can suppress that next OFF pulse and allow the
ON pulse following that to turn on the AC and enable the following OFF
pulse(s), that ought to work.

IMO, the easiest way to do the whole thing would be to find out what the
remote was sending as an ON/OFF signal, then use a ľC to generate that
sequence and do everything else as well. To do it all in hardware and
get a contact closure to do the switching at the remote is pretty
straightforward, albeit somewhat time-consuming, but it might be fun and
I can help you with circuit design and schematics if you like...

The microchip website (manufacturers of PIC) has a technote on controlling
IR remote controls. IIRC, it actually records the IR signal in eeprom, and
plays it back when activated. Not a bad scheme, actually. Otherwise, you are
stuck with analyzing the remote control protocol, which isn't too hard, its
just a matter of determining which protocol it uses.

Also, there is a 'remote control' lamp controller design around that does
the same thing (records, then replays the signal) using a PIC.

http://www.mnsi.net/~boucher/LampCont.htm

--
John Fields

afterburner · Dec 21, 2003

John Fields <jfields@austininstruments.com> wrote in message news:<ida9uvk6eed1eqfik11b1092eenu99t7kb@4ax.com>...

On Tue, 16 Dec 2003 21:44:25 GMT, "Afterburner"
afterburner1@sbcglobal.net> wrote:

To start with I purchased a window air
conditioner and installed it in a wall. It is very
difficult to remove and work on. It is important that
the a/c runs two hours a day to reduce humidity.The
previous a/c worked with an on/off switch. As a result
I could connect it to a mechanical timer and it would
turn on and off at certain times.
The new a/c has a key pad and a remote, but to my
dismay when I hooked it up to the timer it would not
start; a button on the keypad had to be physically
pushed to turn it on, or turned on by a TV type remote.
I found that I could wire into the remote and close
the remote circuit and the IR would trigger the a/c to
operate. I used a micro switch on a mechanical timer
to close the circuit and turn the a/c on and off.
This system works fine, except if the power goes off,
the timer can go out of sync and run for 22 hours day after day.
Long route to get to the point:
I need a circuit (or conversion) that will close the remote's circuit twice
a day that is battery operated (C cell or D cell). I was hoping someone
would have a diagram and/or a suggest on the conversion of a timer.

---
Cute problem.

Sounds like if the AC mains go off while the AC is on for its 2 hour
dehumidifying run and then the mains come back on before the remote
issues the OFF pulse, the AC won't come back on immediately when the
mains come back up, but will wait until it gets the OFF pulse from the
rempte, which it will interpret as an ON pulse and then turn on and run
until it gets the next pulse 22 hours later, go off for two hours and
then go back on for 22, no?

As I see it, there are basically two routes you can take to arrive at a
solution, the first being to put some smarts into the circuitry that's
running the remote, and the second being to put some extra smarts into
the AC itself. Since the AC is already wired to the mains and there
needs to be some awareness of what the mains are doing/have done, I'd
be tempted to start there insted of having to make the circuitry driving
the remote mains-aware. But since you say the AC is a beast to work
on, rigging the remote may well be the best way to go.

First, since you want something to keep time independently of what the
mains is doing you'll need a (crystal-controlled?) timer that runs on
batteries or runs off the mains and switches over to batteries in case
of mains failure. If you use the switchover scheme you can make the
batteries last for a _long_ time.

There are only five possible combinations of mains ON/OFF occurrences
interacting with timer ON/OFF siganls, only two of which result in
permanent ON/OFF time reversals:

First, normal operation:

____________________________________________
MAINS
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
______ ______
AC _____| ON |____OFF_____| ON |_____OFF____

Second, an ON/OFF time reversal occurs when a mains failure and
subsequent recovery brackets the timer's ON pulse:

___ ____________________________________
MAINS |___|
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
_____ ____________ __________
AC __X__|__OFF__| ON |__OFF__| ON

Third, an ON/OFF time reversal occurs when a mains failure occurs and
subsequent recovery occurs between the timer's ON and OFF pulses:

________ _________________________________
MAINS |_|
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
_________ ____________ __________
AC __X__|_X_|___| ON |__OFF__| ON

Fourth, when a mains failure and subsequent recovery brackets the
timer's OFF pulse, an ON/OFF time reversal doesn't occur.

_________ __________________________
MAINS |_______|
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
_________ _______
AC ___X_|_X_|______OFF_______| ON |___OFF____

Fifth, when a mains failure and subsequent recovery falls between the
timer's ON and OFF pulses, an ON/OFF time reversal doesn't occur.

________________ ____________________
MAINS |______|
_ _ _ _
TIMER ____|1|_____|2|__________|1|_____|2|________
| | | |
22Hr -->|<-2Hr->|<---22Hr--->|<-2Hr->|<---22Hr..
_________________ _______
AC __X__|__X____|_X_|__OFF___| ON |___OFF____

Since we need only concern ourselves with the mains failures which cause
ON/OFF time reversals, we need only concern ourselves with the instance
where the mains failure and recovery brackets the timer's ON pulse and
with the instance when the mains failure and recovery occurs between the
timer's ON and OFF pulses.

With that in mind, we should be able to devise a strategy which will
keep the OFF pulse from turning ON the AC. Examining the timing
diagrams above makes it evident that the only time we'll run into
trouble is when a mains failure occurs and its recovery is followed by a
timer OFF pulse, so if we can suppress that next OFF pulse and allow the
ON pulse following that to turn on the AC and enable the following OFF
pulse(s), that ought to work.

IMO, the easiest way to do the whole thing would be to find out what the
remote was sending as an ON/OFF signal, then use a ľC to generate that
sequence and do everything else as well. To do it all in hardware and
get a contact closure to do the switching at the remote is pretty
straightforward, albeit somewhat time-consuming, but it might be fun and
I can help you with circuit design and schematics if you like...

John, thank you so much for your imput. Your identification of the
problum is "spot on!" The analysis does credit to your deductive
skill. I have also done some analysis in the area of failure and
determind the probability of failure at 8 per cent. I agree that the
simplist way to solve the problem is a shunt on the on/off switch and
a mechanical timer. The A/C is , as you say a beast to move, and
requires three people to move because of its high location. Right now
I am on hold, because I have located a timing devise that runs on two
"C" batteries and turns water on to a garden hose and shuts it down at
a specific interval. The inner workings are a small motor, gears, and
a cut off switch. All this is controled by some regulating chip and
other electronic parts. Problem is the one I have is defective and the
manufacturer no longer makes a Nelson 5700 control valve. I planned to
use the output to the motor to close a relay that closes the circuit
and fires the remote. simple and easy. The Nelson company may have the
parts, if they do: fine! If they don't I will look for another devise
that operates similarly on battery power.
For now I'm going to consentrate on Christmas and New Years. If I get
the job done with this type of arrangement I will let all know, same
if I don't!

Best to all of you on this New Year and a very grateful thanks!

Afterburner

CWatters · Dec 22, 2003

"Afterburner" <afterburner1@sbcglobal.net> wrote in message
news:Z0LDb.1218$N%5.434243788@newssvr11.news.prodigy.com...

The new a/c has a key pad and a remote, but to my
dismay when I hooked it up to the timer it would not
start; a button on the keypad had to be physically
pushed to turn it on,

What happens if you hold that button down when the unit is powered up by the
timer? eg could you just fix that button down all the time?

timer

Afterburner

Guest

Michael A. Terrell

Guest

Ken Taylor

Guest

WEBPA

Guest

afterburner

Guest

afterburner

Guest

WEBPA

Guest

afterburner

Guest

afterburner

Guest

John Fields

Guest

Robert Monsen

Guest

afterburner

Guest

CWatters

Guest

Welcome to EDABoard.com

Sponsor

Online statistics

Forum statistics

timer

Afterburner

Guest

Michael A. Terrell

Guest

Ken Taylor

Guest

WEBPA

Guest

afterburner

Guest

afterburner

Guest

WEBPA

Guest

afterburner

Guest

afterburner

Guest

John Fields

Guest

Robert Monsen

Guest

afterburner

Guest

CWatters

Guest

Log in

Welcome to EDABoard.com

Sponsor