Operating instructions

6
At all altitudes, the manifold pressure must be within 0.3 inches
w.c. of that listed in the “Product Data Book applicable to your
model*” for the fuel used. At all altitudes and with either fuel,
the air temperature rise must be within the range listed on the
unit nameplate.
Refer to the following table for kit conversions from natural gas
to propane gas and for altitude adjustments.
Altitude
(Ft)
Gas Kit Orifice
Manifold
Pressure
Natural None #43 3.5" W.C
Propane LPTK09 #55 10.0" W.C.
Natural HANG07 #45 3.5" W.C
Propane HALP09 #56 10.0" W.C.
6001 - 11000
0 - 6000
HIGH ALTITUDE GAS ORIFICE CHART
NOTE: In Canada, gas furanceare are certified to 4500 feet only.
Manual
Shut-Off
Valve
Gas
Valve
Drip Leg
Ground Joint Union
(Installed Ahead Of Gas Valve)
Reduce coupling 1/2" x 1/8",
with 1/8" pipe plug to measure
line gas pressure.
General Layout at the Unit
Natural Gas Connection
Refer to the above figure for the general layout at the unit. The
following rules apply:
1. Use black iron or steel pipe and fittings for the supply piping.
2. Use pipe joint compound on male threads only. Pipe joint
compound must be resistant to the action of the fuel used.
3. Use ground joint unions.
4. Install a drip leg to trap dirt and moisture before it can enter
the gas valve. The drip leg must be a minimum of three
inches long.
5. Use two pipe wrenches when making connection to the gas
valve to keep it from turning.
6. Install a manual shut-off valve in a convenient location (within
six feet of unit) between the meter and the unit.
7. Tighten all joints securely.
8. The unit must be connected to the building piping by one of
the following methods:
• Rigid metallic pipe and fittings
• Semirigid metallic tubing and metallic fittings (Aluminum
alloy tubing must not be used in exterior locations)
• Listed gas appliance connectors used in accordance with
the terms of their listing that are completely in the same
room as the equipment
• In the prior two methods above the connector or tubing
must be protected from physical and thermal damage.
Aluminum alloy tubing and connectors must be coated to
protect against external corrosion when in contact with
masonry, plaster or insulation or are subject to repeated
wettings by liquids (water - not rain water, detergents or
sewage).
GAS PIPING CHECKS
CAUTION
T
O PREVENT PROPERTY DAMAGE OR PERSONAL INJURY DUE TO FIRE, THE
FOLLOWING INSTRUCTIONS MUST BE PERFORMED REGARDING GAS
CONNECTIONS AND PRESSURE TESTING:
•
T
HE UNIT AND ITS GAS CONNECTIONS MUST BE LEAK TESTED BEFORE
PLACING IN OPERATION.
B
ECAUSE OF THE DANGER OF EXPLOSION OR
FIRE, NEVER USE A MATCH OR OPEN FLAME TO TEST FOR LEAKS.
N
EVER
EXCEED SPECIFIED PRESSURES FOR TESTING.
H
IGHER PRESSURE MAY
DAMAGE GAS VALVE AND CAUSE OVERFIRING WHICH MAY RESULT IN
PREMATURE HEAT EXCHANGE FAILURE.
•
T
HIS UNIT AND ITS SHUT-OFF VALVE MUST BE DISCONNECTED FROM
THE GAS SUPPLY DURING ANY PRESSURE TESTING OF THAT SYSTEM AT
TEST PRESSURES IN EXCESS OF 1/2
PSIG
(3.48 K
P
A).
•
T
HIS UNIT MUST BE ISOLATED FROM THE GAS SUPPLY SYSTEM BY
CLOSING ITS MANUAL SHUT-OFF VALVE DURING ANY PRESSURE
TESTING OF THE GAS SUPPLY PIPING SYSTEM AT TEST PRESSURES
EQUAL TO OR LESS THAN 1/2
PSIG
(3.48 K
P
A).
WARNING
T
O AVOID PROPERTY DAMAGE OR PERSONAL INJURY, BE SURE THERE IS
NO OPEN FLAME IN THE VICINITY DURING AIR BLEEDING.
There will be air in the gas supply line after testing for leaks on
a new installation. Therefore the air must be bled from the line.
Follow the steps below to bleed air from the gas line.
1. Ensure there is no open flame in the vicinity.
2. Disconnect power to the unit.
3. Loosen the ground joint union until pure gas expels.
4. Tighten joint union and wait five minutes until gas is
dispersed.
5. Close the main electrical disconnect switch for the unit.
PROPANE GAS INSTALLATIONS
WARNING
TO AVOID PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO FIRE
OR EXPLOSION CAUSED BY A PROPANE GAS LEAK, INSTALL A GAS
DETECTING WARNING DEVICE.
S
INCE RUST CAN REDUCE THE LEVEL
OF ODORANT IN PROPANE GAS, A GAS DETECTING WARNING DEVICE
IS THE ONLY RELIABLE WAY TO DETECT A PROPANE GAS LEAK.
C
ONTACT A LOCAL PROPANE GAS SUPPLIER ABOUT INSTALLING A
GAS DETECTING WARNING DEVICE.
IMPORTANT NOTE: Propane gas conversion kits must be
installed to convert units to propane gas. See High Altitude Gas
Orifice chart for kit part number for this model.
All propane gas equipment must conform to the safety standards
of the National Board of Fire Underwriters (See NBFU Manual
58).
For satisfactory operation, propane gas supply pressure must
be 10 inch w.c. at the unit manifold with all gas appliances in
operation. Maintaining proper gas pressure depends on three
main factors:
1. Vaporization rate, which depends on (a) temperature of the
liquid, and (b) wetted surface area of the container or
containers.
2. Proper pressure regulation.
3. Pressure drop in lines between regulators, and between
second stage regulator and the appliance. Pipe size required