Honeywell C7400 Manual page 25

C7150B MIXED
AIR OR C7046A
DISCHARGE
AIR SENSOR
0/2-10 VDC
INDOOR AIR
SENSOR
C7400
+
OUTDOOR
AIR
ENTHALPY
S
SENSOR
Y1
Y2
W2
W1
3
AUX
G
RH
RC
X
T7350
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.
THE SAME TRANSFORMER CAN BE USED FOR THE THERMOSTAT AND ACTUATOR.
IF SEPARATE HEATING AND COOLING TRANSFORMERS ARE USED, REMOVE JUMPER AT THERMOSTAT.
3
T7350 - TERMINAL "AUX" IS POWERED BY THE HEATING TRANSFORMER (RH).
IF POWERING THE ECONOMIZER TERMINAL "N" WITH THE THERMOSTAT TERMINAL "AUX", BE SURE THE ECONOMIZER IS POWERED BY THE
SAME TRANSFORMER AS TERMINAL "AUX". IF NOT, USE AN ISOLATION RELAY TO POWER "N".
4
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.
5 EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.
Fig. 32. W7212 used with M7215 Damper Motor and T7350 Thermostat.
N1
N
MINIMUM POSITION
P1
ADJUSTMENT
P
T1
T
AQ1
–
AQ
+
SO+
SO
SR+
SR
W7212
4
620 OHM
RESISTOR
25
SOLID STATE ECONOMIZER SYSTEM
TR TR1
24 VAC HOT
24 24 Vac
Vac COM
24 VAC COM
HOT
+ –
2-10 VDC CONTROL
SIGNAL INPUT
1 2
5
3 4
EF EF1
5
C
COOL 1
Y1
Y2
COOL 2
HEAT 2
W2
HEAT 1
W1
A2
G FAN
R
HVAC EQUIPMENT
TERMINAL STRIP
M7215
L1
(HOT)
L2
EXHAUST
FAN
2
L2
1
L1
(HOT)
M13657
63-2484—03