Trane DFIA, Установка, эксплуатация и обслуживание

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MUA-SVX01A-EN • Direct-Fired Make-up Air
39
Installation
If optional disconnect is not furnished with the heater, the field provided
disconnect must be of the proper size and voltage. Refer to the unit nameplate for
minimum circuit ampacity and voltage. The disconnect must be installed in
accordance with Article 430 of the current edition of ANSI/NFPA No. 70 National
Electrical Code. Check the supply voltage before energizing the unit. The
maximum voltage variation should not exceed ±10%. Phase voltage unbalance
must not exceed 2%.
Note: Should any original wire supplied with the heater require replacement, it
must be replaced with wiring materials having a temperature rating of at
least 105°C.
Field Piping
All gas piping must be in accordance with the requirements outlined in the
National Fuel Gas Code -ANSI Z223.1. It is required that a ground union be
installed adjacent to the manifold for easy servicing. A drip leg and/or filter
should be provided upstream of the unit’s inlet gas connection. An additional
shut-off must be located external of the unit’s enclosure. The location of this
valve must comply with all local codes. A 1/8-inch NPT plugged tapping,
accessible for test gauge connection, must be installed immediately upstream of
the gas supply connection to the unit.
WARNING
Equipment
Damage!
Disconnect gas piping to the unit when performing a gas supply line pressure/
leak test. Excessive pressure from leak testing could damage the gas valve. A
damaged or leaking gas valve could result in a fire hazard.
CAUTION
Equipment
Damage!
Do not rely on a shut-off valve to isolate the unit while conducting gas pressure/
leak tests. These valves may not completely shut off, exposing the gas valve to
excessive pressure and damages.
WARNING
Hazardous Gases
and Flammable
Vapors!
Never use an open flame to detect gas leaks. Explosive conditions may exist
which could result in death or personal injury.
Check all pipe joints for leakage using a soap solution or other approved
method.
The gas line should be supported as to place no strain on the unit. Pipe
compounds which are not soluble to liquid petroleum gases should be used on
threaded joints.
Refer to the heater’s rating plate for determining the minimum gas supply
pressure for obaining the maximum gas capacity for which this heater is
specified.
Refer to the heater’s rating plate for determining the maximum supply pressure
to the heater.
Correctly sized piping must be run to the unit. Please note that gas line pressure
must be as shown on the specification plate when unit is operating at full input.