Stand Alone Bac Heater Control Panel (Optional); Operation - BAC Vertex VRC A-1012N Series Operation & Maintenance Manual

Stand Alone BAC Heater Control Panel (Optional)

The heater control system consists of a heater control panel and a combination temperature/water level sensor. The stainless
steel sensor probe with 1/2" NPT mounting fitting has an on/off relay output that de-energizes the heaters whenever the basin
water temperature is above 45°F (7.2°C), or whenever the sensor probe is not fully submersed. The control panel enclosure is
suitable for outdoor use.
The control system utilizes a combination temperature/low water level control sensor, which is powered by a transformer in the
control panel. When the sensor provides a signal to the control panel, the panel sends a control voltage to the magnetic
contactors. When energized, the magnetic contactors supply line voltage to the heaters. Annually inspect the heater control
system prior to the risk of reaching freezing operating conditions.
NOTICE: The stand alone BAC heater control panel temperature/low level control can only be
used with the supplied combination temperature/water level sensor probe. Please contact your
local BAC Representative for replacement parts.

Operation

NOTICE: For the stand alone BAC heater control panel, do not operate the system unattended
or for extended periods of time during test mode (resistor across terminals T1 and T2).
Operation in water temperatures above 45°F (7.2°C) could damage the unit.
NOTICE: For the stand alone BAC heater control panel, do not operate the system unattended
or for extended periods of time with terminals G1-G2 jumpered. A low liquid level condition could
occur, and the system will not shut off which could result in damage to the heater and unit.
Ensure that the element is completely submerged before energizing the main disconnect. The combination temperature/low
level control is preset to energize the heater at 40°F (4.5°C) but will not energize if the water level is too low or if the water
temperature is above 45°F (7.2°C).
Testing the heater when water temperatures are above 45°F (7.2°C):
•
Disconnect the heater control panel and tag out the circuit.
•
Remove the heater control panel cover.
•
Remove the sensor wires connected to terminals T1 and T2 on the combination temperature/low level control and isolate
them.
•
Install the 1.5K ohm test resistor supplied with the heater control panel (in bag on outside of cover) across terminals T1
and T2.
•
Install the heater control panel cover.
•
Energize the system and listen for the contactor closing.
•
After operation, de-energize the circuit, disconnect the heater control panel, and tag out the circuit.
Vertex™ Evaporative Condenser Operation & Maintenance Manual – Operation Considerations for Accessories
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