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Natural Gas
Propane Gas
In. W.C.
kPa
In. W.C.
kPa
Max. 10
2.5
13
3.4
Min. 6.5
1.6
11
2.7
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.
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/NFPA 70. In
Canada, all electrical wiring to the heater should be
in accordance with the latest edition of CSA C22.1
Canadian Electrical Code, Part 1. Do not rely on the
gas or water piping to ground the metal parts of the
heater. Plastic pipe or dielectric unions often 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 ungrounded heater.
Wiring diagrams are included in the information
packet provided with each unit.
1.
All sizes/models of this pool heater must have
115V 60Hz supply voltage unless specifically
ordered otherwise.
2.
The 1825 models are supplied with 3/4 HP pump
motors. All other models are supplied with 1/2
HP pump motors. Consult the National Electrical
Code or the Canadian Electrical Code regarding
branch circuit requirements for equipment with
these motors.
Distance from Gas Meter
Heater
or Last Stage Regulator
Size
0-100'
100-200'
200-300'
0-30.5m 30.5-61m 61-91.4m
500
1½"
2"
2"
600
1½"
2"
2½"
715
2"
2"
2½"
850
2"
2½"
2½"
1010
2"
2½"
3"
1200
2½"
3"
3"
1430
2½"
3"
3"
1670
2½"
3"
3
1825
2½"
3"
3½"
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
Propane Gas
, reduce pipe diamter one size. An
average number of tees and elbows have been taken into account.
Table 3. Gas Piping Sizes.
Figure 8. Sediment Trap Installation.
gas by checking the rating plate. These heaters are
normally equipped to operate below a
2000 foot (609.6m) altitude. Heaters equipped
to operate at higher altitudes have appropriate
stickers or tags attached, also printed information
on rating plate.
2. Use the figures in Table 3 to provide adequate gas
piping from the gas meter to the heater.
3. A sediment 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 (3.5kPa). 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 piping system
at test pressures equal to or less than 1/2 psig
(3.5kPa).
5. Provide gas supply pressure to the heater as
follows:
LAARS Heating Systems
