Honeywell C7400 Manual page 27

~
1
2
+
3
4
F
5
MS7XXX
HONEYWELL
ACTUATOR
C7400
+
OUTDOOR
AIR
ENTHALPY
S
SENSOR
Y1
Y2
5
W2
W1
G
RH
RC
X
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
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD NOT BE REMOVED. DIFFERENTIAL ENTHALPY NOT RECOMMENDED FOR USE
WITH SINGLE-STAGE COOLING SYSTEMS OR SINGLE-STAGE COOLING THERMOSTATS.
4
EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.
5
SEE WIRING DIAGRAMS FOR T7350 AND TB7220/TB8220.
6 TIME CLOCK IS AN OPTION TO USING OCCUPIED CONTACTS ON THE THERMOSTAT.
Fig. 34. W7212 used in single-stage cooling system with single enthalpy changeover and Honeywell actuator and time
N1
N
P1
C7150B MIXED
P
AIR OR C7046A
T1
DISCHARGE
T
AIR SENSOR
AQ1
–
0/2-10 VDC
AQ
INDOOR AIR
+
SENSOR
SO+
SO
SR+
SR
3
620 OHM
RESISTOR
clock for occupancy.
TR1
TR
MINIMUM POSITION
24 24 Vac
ADJUSTMENT Vac COM
HOT
+ –
1 2
5
3 4
EF EF1
W7212
C
Y1
W2
W1
FDR
G
FDR
R
HVAC EQUIPMENT
TERMINAL STRIP
27
SOLID STATE ECONOMIZER SYSTEM
4
COOL 1
EXHAUST
FAN
HEAT 2
UNOCCUPIED
HEAT 1
ST6008
TIMER
FAN
DELAY OCCUPIED
RELAY
FAN
2
L2
L1
(HOT)
L1
(HOT)
L2
6
1
M24219
63-2484—03