Honeywell T7200 - Page 32

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T7200/T7300/Q7300
WIRING DIAGRAMS
L1
(HOT)
L2
2
3
4
7
4
8
5
3
4
6
7
8
9
5
2
1
M4409
RH
RC
R
G
FAN
COOL 3
COOL 1
COOL 2
W1
G
FAN
H1
C1
T7300
THERMOSTAT
Q7300 SUBBASE
HVAC EQUPIMENT
TERMINAL STRIP
SYSTEM
TRANSFORMER
COM
LED1
LED2
Y2
Y1
Y1
Y3
Y2
W1
HEAT 1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
24 VAC SECONDARY.
MUST BE ABLE TO CARRY ADDITIONAL 6 VA LOAD OF THERMOSTAT AND SUBBASE.
ENTHALPY CONTROL MAKES TERMINALS 2-1 ON ENTHALPY RISE AND 2-3 ON ENTHALPY FALL.
RELAY REQUIRED (R8222 OR SIMILAR).
IMPORTANT: MIXED AIR SENSOR MUST BE LOCATED DOWNSTREAM OF THE EVAPORATOR COIL
IN THE DISCHARGE AIR DUCT TO PROVIDE ECONOMIZER LOW LIMIT FUNCTION.
FIELD INSTALLED JUMPER.
ECONOMIZER MOTOR SPRING RETURNS CLOSED ANYTIME FAN IS NOT RUNNING.
24 VAC ONLY.
A3 TERMINAL AVAILABLE ON Q7300A,B,D,E, AND G MODELS ONLY.
9
4
1
8
AUXILIARY
RELAY
CONTACTS
A1
A2
A3
X
C2
Y3
12
3
3K
6K1
6K
5K
W
W
R
R
B
B1
W1
R1
T2
T1
B
RISE
W
R B
OPEN
4K
4K1
5K1
T875 LOW
AMBIENT
COMPRESSOR
LOCKOUT
VIOLET
VIOLET
2K1
2K2
2K
1K
BLUE
MODUTROL
MOTOR
MIXED AIR
TEMPERATURE
CONTROLLER
MINIMUM POSITION
POTENTIOMETER
YELLOW
BROWN
RED
L1
(HOT)
L2
OUTDOOR AIR
CHANGEOVER
SWITCH
BLACK
YELLOW
BLACK RED
TYPICAL W859D ECONOMIZER CONTROL PACKAGE
1K1 1K2
BLACK
3K1
EXISTING HVAC EQUIPMENT
Fig. 34—T7300/Q7300G with W859A Economizer package in 1-stage heat/3-stage cool system defeating
economizer minimum position during unoccupied period.