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Honeywell T8090A User Manual

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69-0750—1
8
Fig. 14—Use of 104994A calibration wrench.
.35
.30
.25
.20
.10
M8583
ANTICIPATOR
SETTING 
LEVER
ANTICIPATOR 
SCALEPLATE
CALIBRATION
WRENCH
Typical Wiring Diagrams
Fig. 15—Typical hookup for clock powered by
separate 24 Vac transformer.
L1 
(HOT)
L2
1
1
POWER SUPPLY.  PROVIDE DISCONNECT MEANS 
AND OVERLOAD PROTECTION AS REQUIRED.
C
C
R
W
HEAT
RELAY
CLOCK
THERMOSTAT
SUBBASE
M1511A
BATTERY
Fig. 16—Typical hookup for clock powered by
two AAA alkaline batteries only.
L1 
(HOT)
L2
1
L1 
(HOT)
L2
1
C
C
R
W
HEAT
RELAY
CLOCK
THERMOSTAT
SUBBASE
1
2
2
POWER SUPPLY.  PROVIDE DISCONNECT MEANS 
AND OVERLOAD PROTECTION AS REQUIRED.
BATTERY BACKUP MAY BE USED IF POWER TO
CLOCK IF INTERRUPTED.
M1512B
BATTERY
Fig. 17—Typical hookup for clock powered by
system transformer. Clock powered by battery
when system is not powered (e.g., power to
system is off or interrupted).
L1 
(HOT)
L2
1
C
C
R
W
HEAT
RELAY
CLOCK
THERMOSTAT
SUBBASE
1
2
POWER SUPPLY.  PROVIDE DISCONNECT MEANS 
AND OVERLOAD PROTECTION AS REQUIRED.
M1513A
BATTERY
Fig. 18—Typical hookup for clock powered
through control system. Clock powered by
battery when heating or cooling equipment is
on; clock takes power from system when
heating equipment is off.
L1 
(HOT)
L2
1
1
L1 
(HOT)
L2
1
HEAT
RELAY
COMPRESSOR
CONTACTOR
CLOCK
POWER SUPPLY.  PROVIDE DISCONNECT MEANS AND 
OVERLOAD PROTECTION AS REQUIRED.
JUMPER RH-RC TERMINALS WHEN ONE TRANSFORMER 
POWERS BOTH HEATING AND COOLING.
FOR POWER STEALING ON HEATING, JUMPER 
C-RH AND C-W TERMINALS.
2
3
3
2
THERMOSTAT
BATTERY
SUBBASE
C
C
RH
RC
W
Y
M1514C