Supplemental Manual
20
HE+ Series 1-Stage Supplemental Manual
(WIRING DIAGRAMS NEXT PAGES)
The heater must be electrically grounded in accordance with the Nation-
al Electrical Code. ANSI / NFPA 70.
Appliance and control wiring must be in accordance with all applicable local codes. The total load of
all heaters must be considered in determining the required contact rating of the controlling thermo-
stat or switch. Each tube heater requires 120V, 60 HZ electrical power sized for 145VA. Maximum
power flow for internal 24V burner components is 21VA.
The Fenwal ignition control includes a 24V/120V relay switch that provides a 45 second pre-purge
and 45 second post-purge of the system. To maintain function of the post-purge feature, any
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A line voltage Thermostat or an “ON/OFF” control switch installed in the 120VAC power supply will
disable the post-purge feature.
A maximum night set-back of 9°F (5°C) is recommended for optimum economy and comfort. To
maintain satisfactory comfort levels do not turn off the heating system over night/weekends.
INPUT FUEL TYPE
LINE PRESSURE
INCHES WATER COLUMN
MANIFOLD PRESSURE
(tap at gas valve outlet) INCHES WATER
COLUMN
MINIMUM MAXIMUM
SINGLE-STAGE
Natural Gas 5.0 14.0 3.5 (4.2 for 225 & 250 Btuh Models)
Propane 11.0 14.0 10.0
◼ Refer to General Manual for requirements on gas supply and flexible gas connection to the heater.
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