– 4 –
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 have to be replaced, it must be replaced
with wiring material having a temperature rating of
at least 105° C.
REMARQUE : Dans le cas où un quelconque des
câbles livrés avec l'unité devait être remplacé, il
doit être remplacé avec des câbles prévus pour
résister à une chaleur d'au moins 105° C.
E. Field Piping
All gas piping must be in accordance with the require-
ments 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
N.P.T. plugged tapping, accessible for test gauge
connection, must be installed immediately upstream of
the gas supply connection to the unit.
WARNING: To avoid equipment damage or
possible personal injury, do not connect gas
piping to this unit until a supply line pressure/
leak test has been completed. Connecting the
unit before completing the pressure/leak test
may damage the unit gas valve and result in a
fire hazard.
DANGER: Never use an open flame to detect
gas leaks. Explosive conditions may exist
which would result in personal injury or death.
The gas line should be supported so that no strain is
placed on the unit. Pipe compounds which are not
soluble to liquid petroleum gases should be used on
threaded joints.
The appliance and its individual shutoff valve must be
disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of 1/2 PSIG.
The appliance must be isolated from the gas supply
piping system by closing its individual manual shutoff
valve during any pressure testing of the gas supply
piping system at test pressure equal to or less than 1/2
PSIG.
Refer to the heater's rating plate for determining the
minimum gas supply pressure for obtaining the
maximum gas capacity for which this heater is
specified.
C. Location of Accessories
Where applicable, standard or optional accessories will
be placed inside the fan section of the unit for shipment,
and must be removed and installed by the mechanical
or electrical contractor. Remotely located discharge or
inlet dampers must be equipped with an end switch and
interlocked to insure maximum design opening before
starting and running circuits may be energized.
Field constructed intake accessories should be properly
designed to minimize the entry of rain and snow.
Adequate building relief must be provided, so as to not
over-pressurize the building, when the heater is
operating at its rated capacity. This can be accom-
plished by taking into account, through standard
engineering methods, the structure’s designed infiltra-
tion rate, by providing properly sized relief openings,
by interlocking a powered exhaust system, or by a
combination of these methods.
D. Electrical Connections
WARNING: Open all disconnect switches and
secure in that position before wiring unit.
Failure to do so may result in personal injury or
death from electrical shock.
WARNING: Controls must be protected from
water. Do not allow water to drip on the ignition
system.
NOTE: Before installing any wiring, check the unit
rating plate for supply power rating.
All electrical connections must conform to the current
edition of: ANSI/NFPA No. 70 National Electrical Code
and applicable state and local codes; in Canada, to the
Canadian Electrical Code, Part 1 CSA Standard C22.1
and applicable provincial and local codes.
Since shipment of unit may require disassembly after
factory check and test, reconnection of some electrical
devices will be required in the field. Connect electrical
wires (supplied in factory furnished conduit) to appro-
priate terminals. All leads are tagged to facilitate field
connections. See wiring diagram provided with equip-
ment. Complete all wiring to any optional accessories
as shown on unit bill of material and electrical wiring
diagram as required before applying voltage to the unit.
Entry location for all field-installed and control wiring is
through the control panel.
If optional disconnect is not furnished with heater, the
field provided disconnect must be of the proper size
and voltage. Refer to 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.
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