Honeywell C7400 Manual page 26

SOLID STATE ECONOMIZER SYSTEM
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
Y1
Y2
W2
W1
3
A
G
R
RC
X
TB7220 OR TB8220
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
TB7220 - TERMINAL "A" IS POWERED BY THE COOLING TRANSFORMER (RC).
TB8220 - TERMINAL "A" IS POWERED BY THE HEATING TRANSFORMER (R).
IF POWERING THE ECONOMIZER TERMINAL "N" WITH THE THERMOSTAT TERMINAL "A", BE SURE THE ECONOMIZER IS POWERED BY THE
SAME TRANSFORMER AS TERMINAL "A". 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. 33. W7212 used with M7215 Damper Motor and TB7220 or TB8220 Thermostats.
63-2484—03
C7150B MIXED
AIR OR C7046A
DISCHARGE
AIR SENSOR
AQ1
–
0/2-10 VDC
INDOOR AIR
+
SENSOR SO+
SR+
+
4
620 OHM
S
RESISTOR
TR
N1
N
MINIMUM POSITION
24
P1
ADJUSTMENT Vac
HOT
P
T1
+
T
1
AQ
3
SO
EF
SR
W7212
C
Y1
Y2
W2
W1
A
G
R
HVAC EQUIPMENT
TERMINAL STRIP
26
TR1
24 VAC HOT
24 Vac
COM
24 VAC COM
–
2-10 VDC CONTROL
SIGNAL INPUT
2
5
4
EF1
M7215
5
L1
(HOT)
L2
EXHAUST
FAN
COOL 1
COOL 2
HEAT 2
HEAT 1
FAN
2
L2
1
L1
(HOT)
M13658