Honeywell C7400 Manual page 28

SOLID STATE ECONOMIZER SYSTEM
~
1
2
+
3
4
F
5
MS7XXX
HONEYWELL
ACTUATOR
C7400
+
OUTDOOR
AIR
ENTHALPY
S
SENSOR
Y1
Y2
W2
8
W1
G
RH
RC
4
X
T7300 OR T874
THERMOSTAT
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA
LOAD OF THE ECONOMIZER AND ACTUATOR.
3
1S IS AN ELECTRONIC SWITCH THAT CLOSES WHEN POWERED
BY A 24 VAC INPUT.
4
FOR T7300 ONLY
5 FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD BE
REMOVED ONLY WHEN A C7400 ENTHALPY SENSOR IS ADDED TO
SR AND SR+ FOR DIFFERENTIAL ENTHALPY.
Fig. 35. W7212 used in two-stage cooling system with Honeywell Series 72 Actuator and time clock for occupancy.
63-2484—03
N1
N
P1
C7150B MIXED
P
AIR OR C7046A
T1
DISCHARGE
T
AIR SENSOR
AQ1
–
0/2-10 VDC
INDOOR AIR AQ
+
SENSOR SO+
SO
SR+
SR
5
620 OHM
RESISTOR
T6031 AMBIENT
W
LOCKOUT
CONTROL
R
50 F SETPOINT
TR TR1
MINIMUM POSITION
24 24 Vac
ADJUSTMENT Vac COM
HOT
+ –
1K
1S 1 2
3
2K
5
3 4
1S1
EF EF1
W7212
7
C
Y1
Y2
W2
W1
FDR
G
FDR
R
HVAC EQUIPMENT
TERMINAL STRIP
6
USE THE FOLLOWING CONTACTS INSTEAD OF TIMER
FOR T7300, USE A1 AND A2 TERMINALS.
FOR T7350 USE AUX TERMINAL.
FOR TB7220 OR TB8220 USE A TERMINAL
THE TERMINALS ARE CONNECTED WHEN THERMOSTAT IS IN THE OCCUPIED MODE.
7
EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.
8 SEE WIRING DIAGRAMS FOR T7350 AND TB7220/TB8220.
9 TIME CLOCK IS AN OPTION TO USING OCCUPIED CONTACTS ON THE THERMOSTAT.
28
L1
(HOT)
COOL 1
L2
EXHAUST
COOL 2
FAN
HEAT 2
UNOCCUPIED
6
HEAT 1
ST6008
TIMER
FAN
DELAY
OCCUPIED
RELAY
FAN
2
L2
1
L1
(HOT)
M24220
9