Table of Contents
Advertisement
T7200/T7300/Q7300
WIRING DIAGRAMS
Fig. 34—T7300/Q7300G with W859A Economizer package in 1-stage heat/3-stage cool system defeating
economizer minimum position during unoccupied period.
T7300
Q7300 SUBBASE
THERMOSTAT
C1
H1
FAN
AUXILIARY
RELAY
CONTACTS
A1
A2
A3
8
9
63-4038—7
RH
RC
X
C2
Y2
Y1
Y3
W1
G
COM
6K1
LED1
8
LED2
TYPICAL W859D ECONOMIZER CONTROL PACKAGE
MIXED AIR
TEMPERATURE
MODUTROL
CONTROLLER
MOTOR
BLUE
B1
W
R
RISE
W1
R1
YELLOW
T2
W
R
T1
OPEN
MINIMUM POSITION
POTENTIOMETER
4K1
5K1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
4K
24 VAC SECONDARY.
2
MUST BE ABLE TO CARRY ADDITIONAL 6 VA LOAD OF THERMOSTAT AND SUBBASE.
4
3
ENTHALPY CONTROL MAKES TERMINALS 2-1 ON ENTHALPY RISE AND 2-3 ON ENTHALPY FALL.
1
4
RELAY REQUIRED (R8222 OR SIMILAR).
L1
L2
(HOT)
5
IMPORTANT: MIXED AIR SENSOR MUST BE LOCATED DOWNSTREAM OF THE EVAPORATOR COIL
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
4
1
2
3K
6K
3K1
5
BLACK
B
1K1 1K2
OUTDOOR AIR
CHANGEOVER
SWITCH
B
RED
32
HVAC EQUPIMENT
SYSTEM
TERMINAL STRIP
TRANSFORMER
R
3
3
Y2
COOL 3
Y3
Y1
HEAT 1
W1
5K
FAN
G
COOL 1
BLACK
YELLOW
COOL 2
2K1
W
2K2
R
B
T875 LOW
2K
AMBIENT
COMPRESSOR
LOCKOUT
1K
VIOLET
VIOLET
L1
(HOT)
L2
2
4
7
M4409
Advertisement
Table of Contents
