34
Connect Gas Supply
The gas supply pipe
should enter the appliance
case through the opening
at the left side. The supply
pipe should be connected
to the appliance gas
inlet pipe situated
at the left side of the
control valve. Supply line
connection to the inlet
pipe is 3/8 inch NPT (female).
If the circulating fan is
to be installed, be aware that the supply pipe run
inside the case should be at the same height as
the appliance inlet pipe in order to clear the fan. If
intending to
fi
t an internal isolating valve, check
that it will be clear of the fan.
Use only new black iron or steel pipes, CSST, or
copper tubing if acceptable—check local codes.
Note
that in USA, copper tubing must be internally
tinned for protection against sulfur compounds.
Unions in gas lines should be of ground joint type.
The gas supply line must be sized and installed to
provide a supply of gas su
ffi
cient to meet the maximum
demand of the appliance without undue loss of
pressure.
Sealant used must be resistant to the action of all gas
constituents including propane gas. Sealant should be
applied lightly to male threads to ensure excess sealant
does not enter gas lines.
The supply line should include a
manual shut-o
ff
valve
to allow the appliance to be disconnected for servicing.
A plugged 1/8 inch NPT tapping must be installed in
the line. The tapping must be accessible for test gauge
connection and be immediately upstream of the gas
supply connection to the appliance.
Pressure test the supply line for leaks.
• The appliance and its individual shut-o
ff
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 appliance must be isolated from the gas
supply piping system by closing its individual
manual shut-o
ff
valve during any pressure
testing of the gas supply piping system at test
pressures equal to or less than 1/2 psig (3.5kPa).
Supply
pressure
test tapping
Manifold
pressure
test tapping
Pressure test tappings
X
X
• Failure to either disconnect or isolate the appliance
during pressure testing may result in regulator or
valve damage. Consult your dealer in this case.
The minimum supply pressure is given in the
Speci
fi
cations
section of this manual.
All piping and connections must be tested for leaks
after installation or servicing. All leaks must be
corrected immediately.
When testing for leaks:
• Make sure that the appliance is turned o
ff
.
• Open the manual shut-o
ff
valve.
• Test for leaks by applying a liquid detergent or soap
solution to all joints. Bubbles forming indicate a gas
leak.
Never use an open
fl
ame to check for leaks.
• Correct any leak detected immediately.
The pressure test tapping locations are shown on
below. A built-in non-adjustable regulator controls the
burner manifold pressure. The correct pressure range
is shown in the table in
Speci
fi
cations
section of this
manual. The pressure check should be made with the
burner alight and at its highest setting. See
Lighting
Instructions
section for full operating details.
Installation
Control
Valve
Manifold Pressure
Adjustment behind
Plastic Cap
QUALIFIED
INSTALLER
Содержание HORIZON H4 Series
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