Sterling GG - Manuel (Page 2)

1. All work must be performed by a fully qualifi ed,
experienced, and trained service technician. It is the
responsibility of the installer to follow all instructions.
Failure to follow these instructions could result in
serious injury or property damage.
2. The qualifi ed agency performing the work assumes
responsibility for the conversion.
3. The gas supply shall be shut off prior
to disconnecting the electrical power, before proceeding
with the conversion.
4. Wear safety glasses.
5. Wear gloves when handling the burner.
6. Be sure of ladder placement. Do not allow people to
stand below or around the area where the work is being
performed.
7. Do not lean ladders or equipment against the heater at
any time during the conversion.
REPLACING THE ORIFICES (See Figure 1)
1. Remove the four hex head screws holding the access
panel and remove the panel.
2. Use the proper size wrench or socket to remove the
burner orifi ce. Remove the natural gas orifi ce and keep
it separated from the L.P. orifi ce at all times.
3. NOTICE: Install L.P. gas orifi ce in manifold, ensuring
that the number stamped on the orifi ce matches
the size listed on page one for the appliance being
converted. The orifi ce must be installed fi nger tight fi rst
to avoid cross threading and the possibility of leaking.
Tighten securely with wrench or socket. Do not over
tighten.
CONVERSION OF THE GAS VALVE
1. Follow all instructions provided with the valve conversion
kit. Be sure valve conversion kit is for the valve on the
appliance. If the instructions are lost or not in the kit
STOP. Call the Customer Service Department and the
instructions will be faxed to you.
OPERATION
1. A water-fi lled U-tube manometer must be used to
measure gas pressures. The gauge type is not reliable
and may give false readings.
2. Gas inlet pressure must be between 11.0 and 14.0
inches water column (2.7-3.5 kPa). Turn off the gas
supply to the heater, connect the manometer to the
pressure tap on the inlet side of the gas valve, turn on the
gas and observe the pressure with the heater not fi ring
and then fi ring. If the pressure is not within the specifi ed
range under both conditions, contact the gas supplier.
3. The manifold pressure must be adjusted to 10.0 inches
water column (2.5 kPa). This manifold pressure applied
to the main burner orifi ce assures that the input rating is
correct for altitudes up to 2000 feet (610 m). For altitudes
above 2000 feet (610 m), see (4) below. This is very
critical as overfi ring or underfi ring can cause problems.
Move the manual control on the gas valve to the “Off”
position, connect the manometer to the pressure tap on
the outlet side of the gas valve, turn the control on, fi re
the unit and adjust the pressure if necessary.
To adjust the pressure, remove the cap from the
pressure regulator on the gas valve, turn the regulator
screw clockwise to increase pressure or counter
clockwise to decrease pressure, then replace the cap.
4. For altitudes above 2000 feet (610 m), heater must be
derated 4% for each 1000 feet (305 m) above sea level.
Adjust manifold pressure according to the L.P. Gas High
Altitude Manifold Pressure Chart on page one.
5. After manometers have been removed and pressure
tap plugs have been reinstalled, fi re the heater and
check all joints for leaks using a soap solution. Never
use an open fl ame to check for gas leaks.
6. Allow the heater to operate for at least 5 minutes, then
observe the main burner fl ame. A hard blue fl ame
extending into the tube is normal. Slight yellow tipping is
acceptable. There is no air adjustment on burner.
7. After the heater is operating properly, cycle the system
using the thermostat to check out the normal operating
sequence of the ignition system. The normal sequence
is as follows:
- Thermostat calls for heat, draft inducer fan starts.
- After a purge period, main gas valve and ignitor are
energized.
- Main fl ame ignites.
- Sensing circuit senses fl ame, turns ignitor off.
When thermostat is satisfi ed, the gas valve is
de-energized, extinguishing the main burner fl ame.
CONVERSION PLATE
1. Apply conversion plate and label to heater jacket panel.
The conversion plate must be installed as closely as
possible to the existing heater rating plate.
2. Replace access panel.
Gas Tightness Of The Safety Shut-Off
Valves Must Be Checked On At Least An Annual Basis!
To check gas tightness of the safety shut-off valves, turn off
the manual valve upstream of the appliance combination
control. Remove the 1/8 inch pipe plug on the inlet side
of the combination control and connect a manometer to
that tapping. Turn the manual valve on to apply pressure
to the combination control. Note the pressure reading on
the manometer, then turn the valve off. A loss of pressure
indicates a leak. If a leak is detected, use a soap solution
to check all threaded connections. If no leak is found, the
combination control is faulty and must be replaced before
putting appliance back in service.
Figure 1