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Page 8
To
Equipment
Inlet
Nipple
Figure 8. T-Fitting Sediment Trap Installation.
2.
Use the figures in Table 3 to provide adequate
gas piping from the gas meter to the heater.
3.
A trap (drip leg) must be provided ahead of
the gas controls (see Figure 8 ). A manual gas
shutoff valve must also be provided for service
convenience and safety. Check the local codes.
4.
The heater 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 heater
must be isolated from the gas supply piping
system by closing its individual manual gas
shutoff valve during any pressure testing of the
gas supply piping system at test pressures equal
to or less than 1/2 psig.
5.
Provide gas supply pressure to the heater as
follows:
Min. (inches
water column)
Max. (inches
water column)
Note: The heater and all other gas appliances
sharing the heater gas supply line must be firing
at maximum capacity to properly measure the
inlet supply pressure. Low gas pressure could be
an indication of an undersized gas meter and/or
obstructed gas supply line.
6.
The correct burner manifold gas pressure is
stamped on the rating plate. The regulator is
preset at the factory and normally requires no
further adjustment.
7.
The gas manifold and control assembly was
tested and conform to the safe lighting and
other performance criteria specified in the latest
editions of ANSI Z21.13, Low Pressure Boiler
Standard.
Gas Supply
Inlet
Tee
Fitting
3" Min.
Cap
Natural Gas
LPG
Per Rating Plate
9
14
8.
Before operating the heater, the complete gas
supply system and all connections must be tested
for leaks using a soap solution. Do not use raw
flame.
Caution
Since some leak test solutions (including soap
and water) may cause corrosion or stress
cracking, the piping must be rinsed with water
after testing, unless it has been determined
that the leak test solution is noncorrosive.
2.5 Electrical Wiring
WARNING
The heater must be electrically grounded in
accordance with the most recent edition of
the National Electrical Code, ANSI/NPA 70.
In Canada, all electrical wiring to the heater
should be in accordance with the Canadian
Electrical Code, CSA C22.1 Part 1. Do not rely
on the gas or water piping to ground the metal
parts of the heater. Oftentimes, plastic pipe or
dielectric unions isolate the heater electrically.
Service and maintenance personnel who work
on or around the heater may be standing on
wet floors and could be electrocuted by an
underground heater.
1.
Check heater wiring and pump for correct
voltage, frequency and phase. If the pump circuit
is other than 115V, check to see that the heater is
provided with an appropriate transformer.
2.
Wire the heater and pump exactly as shown in
the wiring diagram supplied with the heater.
3.
The pump and heater must be electrically
interlocked so the heater cannot come on unless
the pump is running.
4.
All field installed electrical safety devices and
all field installed devices (draft switches, relays,
timers, outdoor temperature reset devices, etc.)
can be connected to the heater wiring at points
shown in the wiring diagram designated "Field
Interlock".
2.6 Water Piping of System
1.
Be sure to provide valves at the inlet and outlet
of the heater so it can be readily isolated for
service. A butterfly or similar type of valve is
recommended.
2.
The pressure relief valve installed in the tapped
opening provided in the outlet header (see
BRADFORD WHITE
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