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Thermostat wiring reference chart - simplest case two-wire thermostat (C) Daniel Friedman How Wire a White Rodgers Room Thermostat
White Rodgers Thermostat Wiring Connection Tables
Hook-up Procedures for new & old White Rodgers Heating, Heat Pump, or Air Conditioning Thermostats

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Thermostat wiring details & connections for the White Rodgers brand of room thermostats. This article gives a table showing the proper wire connections nearly all types of White Rodgers room thermostats, new and old, used to control heating or air conditioning equipment, including the White Rodgers F90 2-wire and 3-wire thermostat installations.

Room thermostat installation & wiring guide: this article series explains the basics of wiring connections at the thermostat for heating, heat pump, or air conditioning systems. Our page top sketch, courtesy of Honeywell Controls, illustrates the wiring diagram for a traditional Honeywell T87F thermostat used for 2-wire single pole single throw control of heating only in a typical gas-fired heating system.



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White Rodgers Thermostat Wiring Guide

Article Contents

Thermostat Wiring Terminal Notes for White Rodgers 1F90 Low Voltage Programmable Digital Comfort-Set

White Rodgers 1F90 Used For 2-wire Heating Only Systems

(W)
White White wire coming to the thermostat from the heater or from the secondary (C) terminal on the transformer, routed through a White Rodgers isolation relay.
(RH)
Red Red wire coming to the thermostat from transformer secondary (R) terminal. The same transformer (R) terminal typically also feeds a gas valve or vent damper, but not through the thermostat. See Note 1 in the table above.

White Rodgers 1F90 Used For 3-Wire Series 10 Heating Systems

(W)
White White wire coming to the thermostat from the heater
(RH)
Red Red wire coming to the thermostat from the heater. From transformer secondary (R) terminal. Note 1
(B)
jumper wire Add a jumper between (R) and (B) on the primary control
(R)
jumper wire Add a jumper between (R) and (B) on the primary control. Note 1.

Notes:

1. The [Honeywell 5-2 Day Programmable Thermostat - RTH2300B1012] thermostat cannot be used if your old thermostat had and used any two of the following wires: R, RC, RH, 4 and V.[5]

2. Color: markings in the thermostat wall plate or in some models at other terminals on the thermostat body itself may indicate conventional wire colors that connect to this terminal, or the terminal ID with a letter such as "R" = red, as we illustrate above.

Watch out: the colors of the wires that you connect to these terminals do not necessarily match the nominal "terminal ID", as we illustrated above at "How Do I Install & Wire Up a Room Thermostat". To allow for someone not following thermostat wire color conventions, when replacing an existing wall thermostat we identify and label the wires according to the letters marked on the terminal block to which the wires were actually connected.

Lennox thermostat and equipment wiring color codes may vary significantly from common usage. Be sure to consult with Lennox and obtain the proper installation manual for your equipment.

These White Rodgers Tables Map Old Thermostat Wires to New (White Rodgers) Thermostat Terminals & Help Identify Old Thermostat Types

White Rodgers Thermostat Terminal Identification Table

Old Thermostat Terminal Marking or ID Old Thermostat Type
4
W
RC
Y
G
1
RH
W
RC
Y
G
2
M
H
V
C
F
3
RS
4
Y6
G
4
R
W
Y
G
5

Notes:

1. Source: White Rodgers 1F90 Low Voltage Digital Comfort Set Thermostat Installation Instructions [7]


Map of Old White Rodgers Thermostat Terminals (4 M R R5 RH H W) to New White Rodgers Thermostat Terminals

Old Thermostat Type New Old   New Old   New Old   New Old   New Old
1
RH 4 W W RC RC Y Y G G
2
RH RH W W RC RC Y Y G G
3
RH M W H RC V Y C G F
4
RH R5 W 4     Y Y6 G G
5
RH R W W     Y Y G G

Notes:

1. Source: White Rodgers 1F90 Low Voltage Digital Comfort Set Thermostat Installation Instructions [7]

White Rodgers Thermostat Wiring Diagrams & Drawings

The White Rodgers 1F90 and similar models will replace most 2-wire heating thermostats and many 3-wire & 4-wire thermostats used for both heating and cooling. It is not used on systems without a transformer or relay, hot water heat systems that use 3-wire zone valves, two-stage heating or cooling systems, and certain other applications. [See the installation instructions for other examples.] A nice feature of this system is that the user can adjust the heating or cooling cycle-on time, and provides features similar to adjusting the heat anticipator in older Honeywell thermostats.

White Rodgers 2-Wire Heat Only Thermostat wiring diagram

White Rodgers 4-wire 1F90 thermostat wiring diagram

2-Wire Heat-Only White Rodgers thermostat wiring detail for a White Rodgers 1F90 Low Voltage Digital Comfort-Set thermostat

Also see our tables of White Rodgers thermostat connections above at

White Rodgers 3-Wire 1F90 Heating Thermostat wiring diagram

White Rodgers 4-wire 1F90 thermostat wiring diagram

3-wire heating-only wiring details for a White Rodgers 1F90 Low Voltage Digital Comfort-Set thermostat

White Rodgers 4-Wire 1F90 Thermostat wiring diagram

White Rodgers 4-wire 1F90 thermostat wiring diagram

4-wire heating & cooling applications using a White Rodgers 1F90 thermostat

White Rodgers 5-Wire 1F90 Thermostat wiring diagrams

5-Wire heating & cooling control wiring using a White Rodgers 1F90 thermostat

White Rodgers 4-wire 1F90 thermostat wiring diagram White Rodgers 4-wire 1F90 thermostat wiring diagram

Reader Question: Wiring a non-programmable White Rodgers Thermostat

I have a 1f86 Non programmable White Rogers i matched up the R to Red W to White and O/B to Black But I Get nothing and unfortunately I stay in a condo with base floor panels so i cant really hear if the heat comes on or not. How do i wire this thermostat correctly - Anon 4/24/12

Reply:

Anon, see these White Rodgers Tables Map Old Thermostat Wires to New (White Rodgers) Thermostat Terminals & Help Identify Old Thermostat Types found in the article above.

We provide thermostat wiring connections for just about every type of residential heating or cooling room thermostat as well as a description of thermostat wiring color codes & conventions.

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