SPX Cooling Technologies 92-1322C - Manual (Page 9)

9
Testing above Freezing Temperatures
Under normal operating conditions the heaters will be turned on at a
water temperature between 40° and 45°F, and turned off when the water
temperature exceeds 45°F. For testing the system at temperatures above
45°F there are two methods as follows:
Method A
1. Disconnect power to the control panel using standard lockout proce-
dure for safety.
2. Remove the panel cover
3. Remove the sensor wires connected to terminals T1 and T2 on the
relay circuit board.
SOLID STATE RELAY CARD
PROBE
BASIN
RED CT
N
G2
G1
T2
T1
SH
120 RED
240 24
COM
NC NO
BLK
RED
BLK
SHIELD
RESISTOR
GREEN
Figure 2
/ Operation /
4. Connect a 1.5K ohm resistor (included in panel) across T1 and T2
terminals—see
Figure 2.
5. Replace panel cover and verify probe is submerged in tower basin
water.
6. With panel cover in place turn on power supply to the system. An au-
dible CLICK should be heard as the contactor engages. If this does not
happen, refer to the Troubleshooting section of this manual.
7. If the system tests OK turn off power, remove the panel cover and re-
move the resistor. Replace sensor wires T1 and T2 and replace the cover.
Turn system on.
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