Hi-E2
Page 9
Supply Pressure Minimum Maximum
Natural Gas 5 inches WC
(125 mm WC)
10.5 inches WC
(265 mm WC)
LP Gas 11 inches WC
(280 mm WC)
14 inches WC
(350 mm WC)
Table 4. Gas Supply Pressure Requirements.
Gas piping must be large enough to provide the
required gas fl ow rate without excessive pres sure drop.
Table 5 specifi es pipe sizes which will limit pressure
drop to 0.5 In WC (125 Pa), based on the National
Fuel Gas Code, ANSI Z223.1/NFPA-54.
Model
Natural Gas LP Gas
0-50'
(0-15m)
50-100'
(15-30m)
100-200'
(30-60m)
0-80'
(0-15m)
50-100'
(15-30m)
100-200'
(30-60m)
220 1" 1-1/4" 1-1/4" 3/4" 1" 1-1/4"
350 1-1/4" 1-1/4" 1-1/2" 1" 1-1/4" 1-1/4"
Table 5. Required Gas Pipe Size.
Support gas piping properly so its weight
does not bear on the heater. Install a drip leg, a non-
restrictive shutoff valve and a union on the gas supply
line outside of the heater (see Figure 14).
Before operating the heater, test the gas supply
system, including all connections, for leaks using a
soap solution. Do not use a fl ame or any ignition
source for leak detection. Dis con nect the heater and its
individual gas shutoff valve during pressure testing if
the test pressure is higher than 1/2 psig (3.34 kPa). If
the pres sure is 1/2 psig (3.45 kPa) or lower, close the
manual valve on the heater gas control during testing.
When the heater is started, check the supply
pressure to verify that it is adequate during heater
operation. Undersize piping, a restrictive fi tting or an
undersize gas meter can cause low operating pressure.
High Elevation
To assure good combustion and general
op er a tion, gas appliances are normally de-rated when
installed at high elevation. This is not necessary
with the Hi-E
2 because it has a special venturi-type
combustion system which self-com pen sates for
changes in barometric pressure. Air fl ow through the
venturi pulls the correct fl ow of gas into the burner
regardless of air density. Good quality combustion and
high effi ciency are assured without special adjustment
or changes to the heater.
2J. Electric Wiring
WARNING
ELECTRICAL SHOCK HAZARD. This heater
contains wiring that carries high voltage. Con-
tact with these wires may result in severe injury
or death.
CAUTION
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
Verify proper operation after servicing.
2J-1. Electrical Power
Electrical wiring must be in accordance with the
latest edition of the National Electric Code (NEC),
ANSI/National Fire Protection Association (NFPA) 70,
unless local code requirements indicate otherwise; and
in Canada with latest edition of CSA C22.1 Canadian
Electrical Code.
The Hi-E
2 requires electrical power from a 115V,
60 Hz source. Wiring connections must be made
exactly as shown in the wiring diagram (see Figure
16). Grounding must be provided as required by the
prevailing electrical code.
Connect wiring inside the junction box , which is
on the right side of the heater and is accessible through
the door opening. Line voltage con nec tions must be
made within this box. A labeled green grounding screw
is provided in the junction box for a ground ing wire
(see Figure 15).
Figure 14. Gas piping at heater.
To
Heater
From
Supply
Figure 15. Field wiring connections.
ATTACH GROUND-
ING WIRE TO
GREEN GROUND-
ING SCREW
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