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HLV
Series
Thermostat
NOTE: Different thermostats operate according to their particular features. Refer to thermostat
specifications for details.
HLV Series heaters require a 24V, two stage thermostat to operate. The burner control box is equipped
with a round terminal strip that accepts three (3) 1/4" insulated female spade terminals. Do not supply
120V to the 24V connection.
Theoretical Example: The thermostat is set to 65° F. The thermostat's preset differential for
high fire mode is 3° F.
When the temperature drops below the setpoint of the thermostat (65° F), low fire will activate. If
the temperature continues to drop below the setpoint by another 3° F (62° F), high fire will activate
bringing the temperature back up to the thermostat's setpoint.
Diagnostics
The controls will automatically lockout the heater system when an external or system fault occurs.
Lockout: If proof of flame is not established, a component failure occurs or blockages are evident, the
heater will enter hard lockout. If lockout occurs, the control can be reset by briefly interrupting
the power source. Refer to Chart 4.1 below for a description of the control module diagnostic
indicator flash codes.
Chart 4.1 •
Control Module Diagnostic Flash Codes
LED Flash Code
Steady ON
1 Flash
2 Flashes
3 Flashes
NOTE: Flash code indicator light is located internally on the control module.
Figure 4.1 •
Operational Indicator Lights
3.0
Operation • Thermostat • Diagnostics • Operation Indicator Lights
Fault Status
Control Fault
Air Flow Fault
Flame - No call for heat
Ignition Lockout
Light 1* (amber)
*
Models with V-1SAO add-on are not equipped with high fire light.
Light 2 (amber)
Indicates High
Indicates Low
Fire Mode
Fire Mode
Operational Indicator Lights
43
Light 3 (amber)
Pressure Switch
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