Heat Pump Systems - Emerson 1F97-1277 User Manual

Single Stage Connections
Refer to equipment manufacturers' instructions for specific system
wiring information .
This thermostat is designed to operate a single-transformer or two-
transformer system .
You can configure the thermostat for use with the following systems:
B
O
System
Single
Stage Energized Energiz-
(SS) in Heat ed in
Cool
or Off
Mode Mode
B
System
Single Energized Energized
Stage in Heat, in Cool
(SS) Off Mode Mode
NEUTRAL
24VAC
120VAC
HOT
HEATING
CLASS II
TRANSFORMER
B
O
Y G
System
Blower/
1st
Energiz- Circula-
Stage
tor Fan
ed in
Energized
Heat
Heat
Heat/ Energiz-
in Cool
Pump 1 & Cool
ed on
Emer-
& Off
(HP1)
(Com-
gency call for
Mode
pressor)
Heat or
Mode
**
Cool
NOTE ➀: Connection for Call for Service diagnostic indicator compatible with mechanical or electronic condenser control with Comfort Alert
Single Stage System with Single Transformer
To Remote Temperature Sensor
Jumper
Y G RC RH C*
Blower/
Circula-
Energized tor Fan
24 Volt
on call Energiz-
Com-
24 Volt
24 Volt
ed on
for Cool
(Hot) mon
(Hot)
call for
(Com-
Heat (option-
Cool
Cool &
pressor)
al)
for Heat
(if ELE
is sel-
ected)
*Common connection required for fault or
malfunction indication and remote sensor .
Single Stage with Two Transformers
Remove Jumper Wire
between RH & RC
Jumper
O Y G RC RH
Blower/
Circula-
Energized
tor Fan
on call
Energiz-
24 Volt
24 Volt
for Cool
ed on
(Hot)
(Hot)
(Com-
call for
Heat
Cool
pressor)
Heat or
Cool
(if ELE
is sel-
ected)
*Common connection required for fault or

Heat Pump Systems

To Remote Temperature Sensor
Jumper
RC RH
C* S
+
DC
supply
Remote
voltage
24 VAC 24 VAC 24 VAC Temp-
to re-
erature
(Hot) (Hot) Common
mote
Cool Heat (optional) Sensor
Temp-
signal
erature
Sensor
SINGLE STAGE gas, oil or electric .
HEAT PUMP TYPE 1 (HP 1). Single stage compressor system; gas
or electric backup .
After wiring, see INSTALLER CONFIGURATION section for proper
thermostat configuration.
S
+ - W
DC
DC
supply
Remote Return
Third
voltage
Temp- to
Energized
wire for
to re-
erature Remote
on call for
3-wire
mote
Sensor Temp-
Heat
zone
Temp-
erature
signal
valve
erature
Sensor
Sensor
To Remote Temperature Sensor
C* S - W
+
DC
DC
supply
Return
24 Volt Remote
voltage
to
Com- Temp-
Energized
to re-
mon erature Remote
on call for
mote
(option- Sensor Temp-
Heat
Temp-
al) signal erature
erature
Sensor
Sensor
malfunction indication and remote sensor .
- W 6
L
Power
DC Auxil-
Closed
Return iary &
Conn-
Diagnostic
to Emer-
ection Indicator
Remote gency
for
(See
Temp- Heat
Comfort
3-wire Note )
erature 1st
Alert II module
zone
Sensor Stage
or similar
valve
malfunction
module
NEUTRAL
24VAC
HOT
WIRING CONNECTIONS
6 L
Diagnostic
Indicator
(See
Note )
1
NEUTRAL
120VAC
24VAC
HOT
CLASS II
TRANSFORMER
NOTE: If continuous backlight or hardwired
power input are desired but do not function
in both HEAT and COOL modes, cut the
6 L
heating transformer 24V wires and tape off .
Connect the neutral circuit disconnected
from the heating transformer to the neutral
circuit of the cooling transformer . Discon-
nect the wire to the RH terminal and install
Diagnostic
a jumper between RH and RC . Depending
Third wire
Indicator
for 3-wire
on the system requirements, replace the
(See
zone valve
cooling transformer with a 75VA class II
Note )
1
transformer if needed .
NEUTRAL
24VAC
HOT
CLASS II
TRANSFORMER
*24 VAC common connection
optional for system operation .
Required for fault or malfunction indi-
cation, remote temperature sensor, or
for continuous backlight operation .
**Dual fuel de-energizes
compressor when auxiliary heat is
energized .
120VAC
CLASS II
TRANSFORMER
120VAC
COOLING
.
TM
3