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Single Stage Unitary Range
ES/ESH-LT209_10152019
GAS PIPING
General Requirements
•
The gas meter and service must be sufficiently large to supply gas to the connected building gas load
including the heating equipment and any other gas fired equipment. Additionally, the gas distribution piping
must be designed according to local and national ordinances. Generally (low pressure) systems designed
with a maximum ½" W.C. total pressure drop meet this requirement
•
Gas supply pipe sizing must be in accordance with the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) in
the US and CSA B149.1 and B149.2 Installation Codes in Canada.
•
Before connecting burners to the gas supply system, verify that high pressure testing of the system has
been completed. Failure to do so may expose the burner components to damaging high pressure, requiring
replacement of key components.
Flexible gas connectors of approved type must be installed as shown in Figure 29, in one plane, and without
sharp bends, kinks or twists. A smooth loop of approximately 12" (30 cm) in diameter is best. Failure to install
the gas connection in the approved manner will result in a hazardous and potentially deadly situation due to the
movement of the heat exchanger and burner in the normal course of operation.
SHUT-OFF VALVE
12"
AIR FLOW
DIRECTION
HEATER
MOVEMENT
0 - 180°
CORRECT POSITIONS
3" (7.62 cm) MAX.
DISPLACEMENT
HEATER
MOVEMENT
HEATER
MOVEMENT
HEATER
MOVEMENT
HEATER
MOVEMENT
INCORRECT POSITIONS
WRONG
WRONG
Figure 29: Flexible Gas Connections
ELECTRICAL WIRING
General Requirements
Heaters are normally controlled by line voltage (120V) or low voltage (24V) thermostats. They are both wired
directly. In all cases, heaters must be grounded in accordance with the National Electric Code, ANSI/NFPA 70
in the US, and the Canadian Electric Code, CSA C22.1 in Canada, and must comply with all local requirements.
Heaters may also be controlled with a manual line switch or timer switch in place of the thermostat. Refer to
Figures 30 - 32 on the following pages for guidance on electrical wiring of heaters.
◊
If any of the original wire as supplied with the heater must be replaced, it must be replaced with wiring
having a rating of at least 105°C temperature service and 600 volts capability.
◊
When connecting multi-fire burners to one low voltage thermostat relay kit S-CE176 must be installed.
Summary of Contents for ES/ESH Series
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