Cycle Rate Adjustment; Battery Placement; Installing Batteries - Honeywell CHRONOTHERM III T8611G User Manual

Fig. 6—T8611R 2-stage heat/1-stage cool thermostat. Exact replacement for York model no. 2ET11700224.
POWER
SUPPLY
3
SUBBASE
THERMOSTAT
LOGIC/
LOGIC
CONTROL
CIRCUIT
CIRCUIT
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
REMOVE JUMPER FOR SYSTEM WITH ISOLATED STAGE 1 HEATING
AND COOLING CONNECTIONS.
3 DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
4
REMOVE JUMPER FOR SYSTEM WITH ISOLATED EMERGENCY HEAT.
5 TRANSFORMER COMMON IS CONNECTED TO B TERMINAL.
Fig. 7—Cycle rate adjustment.

CYCLE RATE ADJUSTMENT

To custom-tailor the thermostat's cycling performance to
different types of heating equipment, a cycle rate adjustment
screw is provided on the back of the thermostat. Correct
setting of this screw will provide optimum savings.
NOTE: Most applications will not require a change in
cycle rate.
The room air temperature will normally vary slightly from
the comfort temperature setting with the cycling of the heat
pump or auxiliary heater.
FAN
SWITCH
ON
AUTO
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
AUTO
HIGH
LIMIT
COOL
R
HIGH
LIMIT
B
EM. HEAT
LED (RED)
X
W2
HEAT 2
E
W1
G
O
H
HEAT 1
Y1
NOTE: THIS DIAGRAM IS FOR USE WHEN REPLACING ONLY YORK
THERMOSTAT MODEL NO. 2ET11700224. USING THIS
DRAWING FOR OTHER INSTALLATIONS CAN RESULT IN
DAMAGE TO THERMOSTAT.
Fig. 8—Battery placement.
The cycle rate of this thermostat is factory-set for heat
pumps. The heat pump compressor cycle rate can be adjusted
by turning the cycle rate adjustment screw located on the back
of the thermostat, see Fig. 7.

INSTALLING BATTERIES

Three AAA alkaline batteries are provided as backup to
prevent program loss in event of power outage. Batteries are
included with thermostat. Install batteries in back of thermo-
stat as shown in Fig. 8.
Without battery backup, the program will remain about 20
seconds in event of power loss. When batteries are first
installed, the display will flash 1:00 PM and 32°.
5
5
MONITOR
AUXILIARY
4
HEAT RELAY
EMERGENCY
HEAT RELAY
STAGE 1
HEAT RELAY
FAN RELAY
2
CHANGEOVER
RELAY (COOL)
CHANGEOVER
RELAY (HEAT)
COMPRESSOR
CONTACTOR
M3206

BATTERY PLACEMENT

(NOTE CORRECT PLUS
AND MINUS DIRECTION)
L1
(HOT)
1
L2
TRANSFORMER
M372A
69-0348—1