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Make up air damper wiring 24v - Pentair Mastertemp Pool & Spa Heater Dual Electronic Ignition 400,000 Btu Lonox Propane 460737

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How do I bypass my Honeywell D896 vent dampner?


The furnace was probably originally equiped with a damper bypass plug that was removed to install the vent damper. Of course some were hardwired in as an accessory. But look inside the furnace vestibule or in the homeowner instruction envelop and see if the original installed tossed the plug in there during installation. That would be GREAT !!!!

Without the wiring diagram of the furnace AND the vent damper, I cannot give you specific input on the wiring. But the damper has to have 24v to operate it and there has to be a switch circuit for making and breaking the gas valve control circuit.

You may have to call a service company to get your issue safely resolved.

Dec 29, 2014 | Honeywell Heating & Cooling

1 Answer

Can i hook up a thermostat to my hot blast wood/coal stove to control the heat in my home


Yes, you most certainly can. It depends on how handy you are and to what extent you are willing to go to make this happen. A lot will depend on how comfortable you are with electrical wiring and understanding HVAC controls and their function.

First though, this is the typical way a wood fired forced air furnace is designed to operate. There is a control transformer and relay to control either a combustion air fan (that you do not have) OR a motorized damper for combustion air that you also do not have. The relay closes on a call for heat from the thermostat and opens the damper from its minimum position to allow combustion air into the firebox. As long as there is solid fuels (wood) in the heat chamber, the fresh supply of combustion air will allow the fire to burn or begin to burn very quickly.

As the temperature in the wood furnace plenum increases, the automatic fan control will start the fan and it will run as long as the bonnet temperature is higher than the fan'on' setpoint on the fan control... Now the house warms up and the thermostat satisfies which allows the combustion air damper to spring back to the minimum position, causing the hot fire to die down due to lack of combustion air.

The now smoldering fire will not generate enough heat to keep the fan running too long, so the automatic fan control shuts the fan off until the house cools approximately 2 degrees below thermostat setpoint. The thermostat calls for heat and opens the damper and on goes the cycle....

An important item to remember is that on the automatic fan control, there is a 'limit switch' function. The motorized combustion air damper or the combustion air fan must be wired through the limit switch in case the bonnet temperature exceeds 200 degrees F. This function will then allow the damper to go to the minimum position or the combustion air fan to go off, causing the fire to cool down due to lack of adequate combustion air.

You don't want the thermostat controlling the circulating fan directly, because of two things: 1). If the fire is out, there is no heat to circulate but the thermostat wouldn't know that and it would start and run the fan continuously until a fire is built. and ....
2). You would still be running up and down the stairs monitoring the fires burn rate by opening and closing the lower door manually.

ALL the components you need are readily available from WW Grainger....basically : a fan/limit control
a thermostat
a 110v x 24v 40 va control transformer
a 24v spdt relay
20 ga. two conductor thermostat wire
24v actuator and linkages to mount to the existing combustion air damper. A bit of creativity is required here. I would not recommend retro-fitting a combustion air fan.
14-2 wg romex for wiring the fan control

Again, it depends to what extent you are willing to go to achieve the end result. Will it be exactly like a new system?? No, but it will operate a lot better than that which you describe.

Oct 24, 2014 | Home

1 Answer

How do I connect a 24v damper motor with 6 colored wires red white yellow green blue black to NO COM NC terminals.


Choose two colors of the thermostat wire, and connect them to the NO and COM and connect them to the zone control board leads for the zone intended. Almost all zone valves spring return open when deenergized. So ensure the zone valve is open with the system is off. At the base of zone valve there is a set screw that needs to engage the damper valve shaft in the open position with the motor in the spring release position. Most zone valve are 90 degree moment from full open to full shut. If you have a Carrier zone valve, they go full open to full shut in 45 degrees of motion. Your open stop need to be set so the valve stops in the full stop position.
To help understand the operation of a zone system, say you have 2 zone system and zone 1 thermostat initiates a heat or cool demand. Zone 2 valves energizes and shuts and zone 1 stays open and allow air to heat/ cool zone 1. If zone 2 thermostat simultaniously initiates the same heat/cool demand, the zone 2 valve opens and both zone heat/cool. When either thermostat is satisfied the opposite zone valve closes and when both thermostat are satisfied both zone valves open.
Hope this helps you understand zone operation. The same works for higher multizone systems.

Jul 27, 2014 | Honeywell Motorized Small Rectangular Hvac...

1 Answer

I posted a question about the Ultra sx 90 (Armstrong) furnace not lighting and the combustion blower keeps running. I did clean the flame sensor and no change. I also changed the spark control moduleas...


When this problem has occurred on my York furnace, the temperature limit switch had to be replaced. You may have checked this in your troubleshooting but if not, it's worth a try

Jan 19, 2013 | Fasco Heating & Cooling

1 Answer

The ac wont come on.Just bought a new furnace control board.The transformer is giving out its 24v.The 'c' terminal is not getting energized but the 'y' terminal is.The t'sts is calling for cooling.The fuse...


Something you might check is on the base of thermostat see if it has a Rc terminal. On most t-stats there will be Y or B,G R ,W,and perhaps three others depending on accessories, such as humidifires,draft dampers etc. You might try jumper wire from R to Rc. Thanks

Nov 05, 2010 | Ruud UBHC Air Conditioner

1 Answer

My home a/c will not start. i have the therm set to cool and 10 deg cooler than room.the breakers are fine and i have power to the contactor.i can manualy start it by pushing on the contactor but as soon...


The contactor needs 2 power sources. 22ov sitting there waiting, and then 24v to close it. The 24v is referred tcoil wires. The 24 comes from the thermostat to the air handler inside, then leapfrogs outdoors to the condenser. Once in thecondenser it can run through low pressure switch also. The goal is to see where the 24v stops. Remove the 2strand wire from the unit (NOT the 220v) and see if 24v there. If not go back towards furnace...if it is there move on into the unit....if 24v is at contactor coil and it is not closed, then the contactor itself is bad.

May 11, 2010 | Carrier 38CKC042 Air Conditioner

1 Answer

I had power blink off for a couple of seconds and then came back on. The Amana air conditioner RCC30A2E seem to be On but no cool air was blowing. I check breaker it was ok. I preceeded to check...


Check for fuses in the 24v wiring. Was anything running outside? The 24V X-former is located in the air handling unit. check for voltage on the air handler. if present, check output voltage at X-former. You should have 24V

Oct 14, 2009 | Heating & Cooling

1 Answer

Low voltage wires


I just tested a mastercool control box and found these 4 control wire colors:

Red (24v supply)
White (pump)
Green (low blower)
Yellow (high blower)

The yellow acted as a common for testing when the blower was not on high.

Blower on low just green has 24v.
Blower on high green and yellow have 24v.

If there was a fifth wire added hopefully it would be a ground wire.

There was also the low gauge wires that were black, white, and ground that were not control wires and delivered power to the control box.

May 05, 2009 | Mastercool 67680 Evaporative Cooler Air...

1 Answer

Need wiring help for replacing trane model baystat 239 with a honeywell th8321u thermostat


I am not sure of what help you need on it but here are the most common wiring on a stat
W= heat
C=Common (24V)
R=Hot (24V)
G= Fan
RC=Hot (24v for Cooling)
RH= Hot (24v for Heat)
O= Reversing Valve (Heat Pumps Only)
Hope this helps

May 11, 2008 | Heating & Cooling

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