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Fig. 35—T7300/Q7300A,B with W859D economizer package in 2-stage heat/2-stage cool system defeating
economizer minimum position during unoccupied period.
T7300
Q7300 SUBBASE
THERMOSTAT
C2
C1
H2
H1
FAN
TYPICAL W859D ECONOMIZER CONTROL PACKAGE
MODUTROL
MOTOR
AUXILIARY
B1
RELAY
CONTACTS
W1
A1
R1
A2
T2
A3
T1
8
9
4K
4
1
(HOT)
RH
4
RC
3K
X
Y2
Y1
W2
W1
G
COM
LED1
8
3K1
LED2
MIXED AIR
5
BLACK
TEMPERATURE
CONTROLLER
BLUE
W
R
B
RISE
YELLOW
W
R
B
OPEN
MINIMUM POSITION
POTENTIOMETER
RED
4K1
5K1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
24 VAC SECONDARY.
2
MUST BE ABLE TO CARRY ADDITIONAL 6 VA LOAD OF THERMOSTAT AND SUBBASE.
3
ENTHALPY CONTROL MAKES TERMINALS 2-1 ON ENTHALPY RISE AND 2-3 ON ENTHALPY FALL.
4
RELAY REQUIRED (R8222 OR SIMILAR).
L1
L2
IMPORTANT: MIXED AIR SENSOR MUST BE LOCATED DOWNSTREAM OF THE EVAPORATOR COIL
5
IN THE DISCHARGE AIR DUCT TO PROVIDE ECONOMIZER LOW LIMIT FUNCTION.
6
FIELD INSTALLED JUMPER.
7
ECONOMIZER MOTOR SPRING RETURNS CLOSED ANYTIME FAN IS NOT RUNNING.
8
24 VAC ONLY.
9
A3 TERMINAL AVAILABLE ON Q7300A,B,D,E, AND G MODELS ONLY.
EXISTING HVAC EQUIPMENT
HVAC EQUPIMENT
TERMINAL STRIP
R
3
1
2
3
Y2
W2
Y1
W1
G
1K1 1K2
OUTDOOR AIR
CHANGEOVER
SWITCH
2K
1K
33
T7200/T7300/Q7300
WIRING DIAGRAMS
SYSTEM
TRANSFORMER
L1
(HOT)
L2
2
HEAT 2
HEAT 1.
4
5K
7
FAN
COOL 1
BLACK
YELLOW
COOL 2
2K1
W
2K2
R
B
T875 LOW
AMBIENT
COMPRESSOR
LOCKOUT
VIOLET
VIOLET
M4411
63-4038—7
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