Home > WHITE RODGERS > WHITE-RODGERS 1F91-71 Multi Stage Electronic Digital Thermostat Installation Guide
WHITE-RODGERS 1F91-71 Multi Stage Electronic Digital Thermostat Installation Guide
NOTE
IF SAFETY CIRCUITS ARE IN ONLY ONE OF THE
SYSTEMS, REMOVE THE TRANSFORMER OF THE
SYSTEM WITH NO SAFETY CIRCUITS.
Thermostat
Control
Circuit
THERMOSTAT
SYSTEM
O
B
Y1
Y2
G
W1
W2
W3
R
C
Changeover
Energized
In Heat
Compressor
Contactor
Stage 2
Heat
Relay
Heat
Relay
CUT AND
TAPE OFF!
Stage 1
Stage 3
Limit or
Safety
Limit or
Safety
TRANSFORMER
Hot
Hot
Changeover
Energized
In Cool
Compressor
Contactor
Stage 1
Heat
Switches
Switches
120vAC
24vAC
Fan
24vAC
120vAC
Neutral
Relay
Relay
Neutral
TRANSFORMER
Stage 2
DEPENDING ON SYSTEM
REQUIREMENTS, REPLACE
WITH A 75VA TRANS-
FORMER, IF NEEDED
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Figure 5. Typical wiring diagram for two-transformer systems with NO safety circuits
NOTE
CAUTION
!
Relaycontactsshownarethermostaticallyoperated. The
accessory relay scheme is required when safety circuits
exist in both systems.
Polarity must be observed. If the HOT side of the
secondtransformerisjumperedtotheCOMMON
side of the first transformer, a short will be made.
Damage to equipment will occur when power is
restored.
Thermostat
Control
Circuit
THERMOSTAT
SYSTEM
O
B
Y1
Y2
G
W1
W2
W3
C
R
Limit or
Safety
Limit or
Safety
Changeover
Energized
In Heat
Compressor
Contactor
Stage 2
Heat
Relay
Heat
Relay
Hot
Switches
Switches
Stage 1
Stage 3
24vAC
120vAC
Neutral
Changeover
Energized
In Cool
Compressor
Contactor
Stage 1
Heat
HEATING
TRANSFORMER
24vAC
Fan
Accessory
Relay N.O.
Contact
Relay
Relay
Stage 2
Limit or
Safety
Limit or
Safety
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Hot
Switches
Switches
24vAC
120vAC
Neutral
COOLING
TRANSFORMER
Figure 6. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems
5
| General | Details |
|---|---|
| Name | WHITE-RODGERS 1F91-71 Multi Stage Electronic Digital Thermostat Installation Guide |
| Make | WHITE RODGERS |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.11 MB |
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