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Hi, I want to wire a Type 19/T Thermomess thermostat to my oil boiler at home. I am not too sure what wire I should connect to the terminals. On TR (the temp control) I have points 1, 2, P1 and on STB (reset switch unit) I have 1, 2, and P1. My mains power goes to the burner via the thermostat and I want to connect the wires correctly. Does the mains cable connect to TR (Live on 1, with Neutral on 2)? Do I connect burner cable to STB (Live on 1 and Neutral on 2)? What is P1 ? do I need to jumper across these 2 points on TR and STB? Need help?

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4 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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bobicehouse
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SOURCE: Thermostat wiring

Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} Thermostat wire color codes explained.
Please note. Not all installers use the proper color codes when they install or replace equipment. It may be necessary go go to the furnace or outdoor unit to verify what wires are for what purpose. Also be sure there are no splices in the wire that could change the wire colors between components.

  • R (red) or Rh (Red heat) 24 volts from equipment.
  • Rc (Red cooling) 24 volts from transformer in cooling equipment.
Note: If only furnace has a transformer and cooling equipment does not jumper Rc and Rh.
  • W (White) sends 24 volts to furnace control to start the heating cycle.
  • W2 (no standardized wire color, usually whatever wire color is available) controls second stage heat.
Note: W2 is most often used for heat pumps to control what is called emegency heat or Auxillary heat, and most often will use the white wire.
  • Y (yellow) often (blue) is used, controls cooling unit (outdoor condensing unit) also is used for heat pump heat.
  • Y2 (no standardized wire color, usually whatever wire color is available) controls second stage cooling.
  • G (Green) controls the fan "on" operation of the furnace/air handler. Also often is used to start the blower for many electric furnaces.
  • C (common) most often brown but can also be black or other color available to installer.
  • O (orange) Energizes heat pump reversing valve for cooling (Trane and most other brands).
  • B (Blue) Energizes heat pump reversing valve for heating (Rheem, Ruud and Weatherking).

Posted on Jun 02, 2009

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  • 30 Answers

SOURCE: need to connect 240 volt 60 amp breaker with 6.3 - 4 wire

Yes the red and black wires are both hot. As for the white and bare wire, they can both go on the neutral bus bar because ground and neutral are not separated. Actually you don't have to have the bare ground wire, but it is a good idea to connect it for inspection and code purposes. If you don't have a neutral bar in the subpanel, you can just connect the white and bare wires directly to the box and they will be ok.

Posted on Aug 13, 2009

  • 77 Answers

SOURCE: HELP!! New install of GMUH75-E3A

You need to find out if the problem is in the T-stat, T-stat wire or in the furnace you can do this in a few easy steps

 

Step 1- Unwire the low voltage from the furnace. Then turn the power back on and see if the blower comes on if it does then the problem is in the furnace and you will need to troubleshoot the furnace (see bottom of page for troubleshooting furnace) if it does not then proceed to step 2

 

Step 2- Wire the low voltage back up to the furnace (follow the wiring diagram below). And unwire the T-stat, make sure that no wires are touching each other, then turn the power back on to the furnace, if the blower starts then you have a short in the T-stat wire and you will need to pull a new wire. If it does not then proceed to step 3

 

Step 3- Turn the power back off at the furnace and wire the T-stat back up (follow the wiring diagram below). Turn the T-stat to auto heat 90 if the heat does not start but the blower just runs then you need to replace the T-stat.

 

 

troubleshooting furnace

 

http://www.hvac-for-beginners.com/furnace-troubleshooting.html

 

 

wiring diagram

 

 

 

 

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Posted on Nov 24, 2010

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