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3.0
Installation
•
Thermostat
This heater must be installed and serviced by trained gas installation and service
personnel only.
Do not bypass any safety features or the heater's built in safety mechanisms will be
compromised.
• This heater must be electrically grounded in accordance with the Canadian Electrical Code C22.1
(latest edition).
• Applications must conform to the Canadian Electrical Codes C22.1 (latest edition) when an external
electrical source is used.
• Refer to the rating label on heater for the required amperage rating.
• Under no circumstance is the electrical supply line to the heater to provide any assistance in the
suspension of the heater.
• Neither the electrical supply line nor sprinkler heads shall be located within the minimum clearances
to combustibles.
Thermostat
Connecting the thermostat with a voltage other than 24V may damage the heater. The HL2 Series
requires a 24V connection to the thermostat. This is either supplied by the heater internally (standard) or
by an external transformer (with optional relay board, P/N: HLRB). See Figure 3.34B.
NOTE: Different thermostats operate according to their particular features. Refer to thermostat
specifications for details.
HL2 Series heaters require a 24V, two-stage thermostat to operate. The burner control box is equipped
with either a round terminal strip that accepts three (3) 1/4-inch insulated female spade terminals or a
36-inch yellow 24VAC control wire. Do not supply 120VAC to the 24VAC connection.
The HL2 Series is equipped with or without a relay board (P/N: HLRB).
Standard Configuration
Without relay board (white terminal label*):
• Single burner control box.
• Single thermostat.
Optional Configuration
With relay board (orange terminal label*):
• Required when a single thermostat controls two or more burner control boxes or when heaters are
common vented.
NOTE: Units with a relay board installed must have an external transformer (field supplied), see wiring
diagram. (Figure 3.34B) Stainless steel heaters, with a relay board, are indicated with the suffix 'D' on
the heater's rating plate.
*A yellow control wire replaces the external terminal plug on stainless steel models or models with water
resistant upgrades.
!
WARNING
NOTICE
(must be factory installed)
46
HL2
Series
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