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6. GAS SUPPLY: MINIMUM / MAXIMUM & MANIFOLD PRESSURES
Refer to General Manual for requirements on gas supply and flexible gas connection to the heater.
◼
TABLE 5 MODULATING GAS SUPPLY — LINE AND MANIFOLD PRESSURES
INPUT
[BTUH]
80,000
115,000
155,000
205,000
250,000
7. ELECTRICAL AND THERMOSTAT WIRING
NOTICE
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 Ther-
mostat / control must be installed in the thermostat circuit from the terminal block (TR - TW).
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.
HE+ Series Modulating Supplemental Manual
LINE PRESSURE
GAS TYPE
[ INCHES W.C.]
NG
PROPANE
NG
PROPANE
NG
PROPANE
NG
PROPANE
NG
PROPANE
The heater must be electrically grounded in accordance with the Nation-
al Electrical Code. ANSI / NFPA 70.
5.0 — 14.0
11.0 — 14.0
5.0 — 14.0
11.0 — 14.0
5.0 — 14.0
11.0 — 14.0
5.0 — 14.0
11.0 — 14.0
6.5 — 14.0
11.0 — 14.0
(WIRING DIAGRAMS NEXT PAGES)
18
MANIFOLD PRESSURE
[ INCHES W.C.]
2.2 — 3.5
5.5 — 10.0
1.8 — 3.5
4.5 — 10.0
2.0 — 3.5
4.5 — 10.0
1.8 — 3.5
4.5 — 10.0
2.3 — 4.0
5.0 — 10.0
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