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attached.
2. Use the figures in Table III to provide adequate
gas piping from the gas meter to the heater.
Table III. Gas Piping Sizes
Distance from Gas Meter
or Last Stage Regulator
Model
0-100'
500
1-1/2"
600
1-1/2"
715
2"
850
2"
1010
2"
1200
2-1/2"
1430
2-1/2"
1670
2-1/2"
1825
2-1/2"
Note: These figures are for Natural Gas (.65 Sp.
Gr.), and are based on 1/2" water column pressure
drop. Check supply pressure with a manometer, and
local code requirements for variations. For LPG,
reduce pipe diameter one size, but maintain a 1"
minimum diameter. A normal number of Tees and
elbows have been taken into allowance.
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 boiler 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 boiler 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.
Figure 8 – T-Fitting Sediment Trap Installation
100-200'
200-300'
2"
2"
2"
2-1/2"
2"
2-1/2"
2-1/2"
2-1/2"
2-1/2"
3"
3"
3"
3"
3"
3"
3"
3"
3-1/2"
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 and CGA 3.3 Low
Pressure Boiler Standard.
8. Before operating the boiler, 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.
2E. 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
8
Natural Gas
LPG
Per Rating Plate
9
14
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