Honeywell CHRONOTHERM IV DELUXE T8624D Product Data page 5

Standard Alternate
Terminal Terminal
Designations Designations
B —
a
C B , C, X1, X2
G F
O R
OT, OT —
R V
RC —
W1 H1, R3
W2 H2, R4, W3, Y
Y1 C1, M, Y
Y2 C2, M, Y
a
Some OEM models label the terminal for transformer common B.
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
Fig. 4. Proper wiring technique.
Mounting Thermostat Wallplate
The thermostat mounts on the wallplate after they are
installed.
1. Engage tabs at the top of thermostat and wallplate.
See Fig. 5.
2. Press lower edge of case to latch.
NOTE: To remove the thermostat from the wall, first pull out
at the bottom of the thermostat; then remove the top.
T8624D CHRONOTHERM
Table 4. Terminal Designations and Descriptions.
Typical Connection
Heat damper or changeover valve
Common
Fan relay
Cool damper or changeover valve
Outdoor temperature sensor (C7089B)
24V system or heating transformer
24V cooling transformer
Stage 1 heating relay
Stage 2 heating relay
Stage 1 compressor contactor
Stage 2 compressor contactor
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).
M4826
®
IV DELUXE PROGRAMMABLE THERMOSTAT
Function
Output
Input
Output
Output
Input
Input
Input
Output
Output
Output
Output
A.
ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.
B.
PRESS LOWER EDGE OF CASE TO LATCH.
Fig. 5. Mounting thermostat on wallplate.
5
Terminal Type
24V powered contact
24V powered contact
24V powered contact
—
—
—
24V powered contact
24V powered contact
24V powered contact
24V powered contact
M15043
68-0166—1