Product Overview

24
W7100A-E
TABLE 6—W7100 CONTROLLER CHECKOUT, COOLING MODE (continued).
SYSTEM CHECKOUT
Step Action Verification
6 Return setpoint knob to 56° F [13° C]. If reset is used,
proceed to next step. If not, go to step 10.
Cooling LEDs should indicate staging on in
about ten seconds.
7 Adjust reset knob to 15° F [-9° C] cooling, the setpoint at
41° F [5° C], and replace the jumper at reset terminals
(6 and 7) with the 1780 ohm resistor (red leads) from
4074EDJ Bag Assembly to simulate a call for maximum
reset.
The cooling LEDs should remain on.
8 Adjust the setpoint knob to 49° F [9° C]. After
verification, immediately proceed to the next step.
The cooling LEDs should indicate all stages off
within one to two minutes.
9 Remove the 1780 ohm resistor (red leads) from reset
terminals 6 and 7 and replace with a jumper. Adjust
setpoint knob to 56° F [13° C].
The cooling LEDs should indicate all stages on
within one minute.
Economizer
10 Disconnect motor leads W, R, B, and Y. Jumper
terminals R-W and R-B on the economizer motor.
Remove jumper after verification.
Economizer motor should drive to mid position.
This verifies proper motor operation.
11 With all cooling LEDs on and motor leads disconnected,
measure the dc voltage at terminals R (negative) to W
(positive).
Voltage should measure 1.9 Vdc ± 0.2 Vdc.
12 Adjust setpoint knob to 64° F [18° C] to drive
economizer outputs to minimum position. Measure the dc
voltage at terminals R (negative) to W (positive) after
about five minutes.
The cooling LEDs should indicate all stages off
within one to two minutes.
The R-W voltage should drop to above 0.2 Vdc
after five minutes.
13 Disconnect power to W7100. —
14 Measure the resistance across terminals:
R-W
R-B
R-Y
Resistance should be as follows:
R-W: 226 ohms
R-B: 432 ohms
R-Y: 226 ohms
15 Reconnect economizer motor terminals W, R, B, and Y.
Remove 3400 ohm resistor (blue leads) from terminals
T-T1 and reconnect C7100 Sensor. Remove test plug and
reinsert red dust cover on bottom of W7100. Adjust
setpoint and reset (if used) to original settings.
—
16 Close electrical disconnects on compressors. —