SPX Cooling Technologies 92-1322C - Manual (Page 11)

11
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
JUMPER
GREEN
Figure 3
Caution
Deicing
If the temperature/water level sensor assembly becomes encased in ice
the heaters will not operate. Ice provides inadequate conductivity for the
sensor probe to detect operational water level. To operate heaters in this
situation and melt the ice follow these procedures.
1. Disconnect power to the control panel using standard lockout proce-
dures for safety.
2. Remove the panel cover.
3. Install a jumper wire between relay terminals G1 and G2—see
Figure 3.
/ Operation /
4. Replace panel cover.
5. Energize the system and listen for contactor closing.
6. Operate the system until ice is melted around the sensor probe.
7. After ice is melted, de-energize the system, remove the jumper, check
all connections and place the system back in operation.
Do not leave the heating system unattended during this procedure.
There is no low water protection with this jumper in place.