16
INSTALLER’S GUIDE
18-HE39D8-13A-EN
5B. Checkout - For Units with a Honeywell W7212 Control, Only. See 5A for W7459
Table 4. Checkout for W7212, W7213, W7214 Economizer Connected to Honeywell Actuator
Figure 18. Meter location for checkout and
troubleshooting (W7212 shown).
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. 18 for checkout.
W7212
M20612
N1
P1
T1
N
2V
2V
2V
B
A
SR
SO
AQ
C
D
Free
Cool
10V
EXH
DCV
EXH
Set
10V
DCV
Max
10V
DCV
Set
Min
Pos
Open
P
T
AQ1
SO+
SR+
1
2
DC VOLTMETER
+
S
+
C7400
1
2
620 OHM RESISTOR
INSERT DC VOLTMETER BETWEEN AQ AND AQ1 FOR
CHECKOUT AND TROUBLESHOOTING.
JUMPER USED FOR SINGLE ENTHALPY CONTROL.
CAUTION
Equipment Damage Hazard.
Excessive force can damage potentiometer
controls.
Use a small screwdriver when adjusting enthalpy
changeover and minimum damper position controls.
!
Step
Checkout Procedure
Proper Response
1.
CHECKOUT PREPARATION FOR ECONOMIZING ONLY
Disconnect power at TR and TR1
All LED are off; Exhaust Fan contacts are open
Disconnect devices at P and P1
Jumper P to P1 (defaults to on board MIN POS potentiometer).
Jumper TR to 1 (call for cooling from the thermostat).
Place 5.6K ohm resistor across T and T1 (Blue sleeve-provides input to
economizer that the MAT is between 50-55F).
W7212 only jumper TR to N (places economizer in occupied mode).
If connected, remove C7400 Enthalpy Sensor from terminals S
O
and +.
Connect 1.2K ohm, from 4074EJM Checkout Resistor kit, (purple sleeve)
across terminals S
O
and + (makes OA enthalpy high).
Place 620 ohm resistor (white sleeve) across S
R
and + (makes 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 approximately
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
