Honeywell Heat/1Cool - T841A1563 Premier 2 Stage Thermostat User Manual page 77

Function
Existing Terminals
or or
Common
X2 –
Power
V R V/VR
Compressor
M W1 M1
1st Stage
– –
Heat
Auxiliary
Y W2
Heat
Fan
F G
C/O Valve
– –
Heat
C/O Valve
R Y1
Cool
System Monitor/
– –
System Defrost
Em. Heat
E –
Multiple Aux.
– –
Heat Loads
LED Indicator
– –
2nd Stage
– –
Compressor
Configure O/B (select models) in Installer Setup.
Both first stage heat and cool are connected to M terminal.
Terminal is for multiple auxiliary heat loads such as contactors, sequencers or
relays.
Terminal X (C) must be connected to transformer common.
Field-installed E to W2 (Aux) jumper required.
LED is energized when terminal is powered.
T872G1026/Q672E1019
T872R1040/Q672B1202 (P-8-11221)
T874G1014/Q674E1148 (24F5801)
T874G1022/Q674E1148 (24F5701)
Electromechanical
or
– – X X
V/VR R R
M Y1 Y1
R – W1 W1
Y Y W2 W2
F G G G
– – B B
– R O O
– – L –
– – E E
– – – W3
– – – X1 X2
– – – –
TYPICAL THERMOSTATS AND SUBBASES — HONEYWELL MODEL NUMBER
Electronic Replacement or Upgrade
Chronotherm ®
III
C C
R R
or
Y1 Y Y
W1 W1
W2 W2
G G
B B
O O
L L
E E
– –
X1 X2 –
– –
L terminal is powered continuously when thermostat is in Em. Ht. position.
If separate Y1 and W1 terminals are required, install R8222D1014; see
page 12.
If separate transformers are used, replace with one 75 VA transformer as
shown on page 78.
When replacing models with one compressor terminal (M), jumper Y1 to W1.
When W2 is not used, configure W2 cycle rate to NC.
T872G1067/Q672E1142 (P-8-11222)
T874R1024/Q674B1160
T874G1154/Q674E1015
LENNOX
TYPICAL HP6 (ALTERNATE)
Chronotherm
IV
C C C
R R R
Y1 Y Y1
W1 W1 W1
W2 W2 W2
G G G
or or
B O/B B B
or or
O O/B O O
L L L
E E E
– – –
– – X1 X2
– – –
C
R
Y1/W1
–
Aux.
G
O/B O/B
O/B O/B
L
E
–
–
W2
M13161
70-6627 • 75