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5B. CHECKOUT - For Units with a Honeywell W7212 Control, Only. See 5A for W7459
CHECKOUT AND TROUBLESHOOTING
Checkout requires a 9V battery, 620 ohm, 1.2K ohm, 5.6K ohm,
and 6.8K ohm resistors. Use Table 4 and Fig. 12 for checkout.
Equipment Damage Hazard.
Excessive force can damage potentiometer controls.
Use a small screwdriver when adjusting enthalpy
changeover and minimum damper position controls.
Table 4. Checkout for W7212, W7213, W7214 Economizer Connected to Honeywell Actuator
Step
CHECKOUT PREPARATION FOR ECONOMIZING ONLY
1.
Disconnect power at TR and TR1
Disconnect devices at P and P1
Jumper P to P1 (defaults to on board MIN POS potentiometer).
Place 5.6K ohm resistor across T and T1 (Blue sleeve-provides
input to economizer that the MAT is between 50-55F).
Jumper TR to 1 (call for cooling from the thermostat).
W7212 only jumper TR to N (places economizer in occupied
mode).
If connected, remove C7400 Enthalpy Sensor from terminals S
and +.
Connect 1.2K ohm, from 4074EJM Checkout Resistor kit, (purple
sleeve) across terminals S
Place 620 ohm resistor (white sleeve) across S
return enthalpy lower than OA).
Set MIN POS and DCV MAX potentiometers fully CCW.
Turn DCV setpoint potentiometer mid position (this sets the DCV
ventilation at approximately 1000 ppm).
Turn exhaust potentiometer to mid position (motor will be ap-
proximately 50% open when the exhaust fan contacts make).
Set enthalpy potentiometer to D.
W7214 only Jumper TR to O.
Apply power (24 Vac) to terminals TR and TR1
CAUTION
Checkout Procedure
and + (makes OA enthalpy high).
O
1
DC VOLTMETER
+
S
C7400
+
1
INSERT DC VOLTMETER BETWEEN AQ AND AQ1 FOR
CHECKOUT AND TROUBLESHOOTING.
2
JUMPER USED FOR SINGLE ENTHALPY CONTROL.
Fig. 12. Meter location for checkout
and troubleshooting (W7212 shown).
O
All LED are off; Exhaust Fan contacts are open
and + (makes
R
INSTALLER'S GUIDE
W7212
EXH
N1
Set
N
2V
10V
EXH
P1
P
Min
Pos
T1
Open
T
DCV
Max
2V
10V
AQ1
DCV
AQ
DCV
Set
SO+
2V
10V
SO
Free
SR+
Cool
B
C
SR
A
D
2
620 OHM RESISTOR
Proper Response
M20612
13
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