Table of Contents
Advertisement
Pressure
Gauge
Installation
NOTE: For natural gas installations, the incom-
ing gas line pressure at the gas valve inlet must
be between 4.5" WC and 10.0" WC. For LP gas
installations,
the incoming gas line pressure at
the gas valve inlet must be between 11.0" WC
and 14.0" WC. This pressure can be checked
at the inlet end of the gas valve using a pressure
gauge or U-tube manometer,
which must be
installed according to the manufacturer's
sup-
plied instructions.
LIGHTING AND ADJUSTMENT
OF
THEAPPLIANCE
1.
Turn ON the gas at the manual
valve,
outside of the unit.
2.
Check all gas connections
for leaks with
a soap and water solution.
If the solution
bubbles there is a gas leak which must be
corrected.
Do NOT use an open flame to
check for gas leaks.
3.
Turn ON the electrical
power to the appli-
ance.
4.
Move the gas valve lever/knob to the "ON"
position.
The lever/knob
must be moved
to the end of its range of motion to insure
the valve is completely
open.
Use only
your hand to push in or turn the gas control
valve.
Never use tools.
5.
Set the room thermostat
to a point above
room temperature
to begin the heating
cycle of the unit.
6.
Check that the unit ignites and operates
properly.
Refer to the installation instruc-
tions provided with your unit for the normal
operating
sequence.
7.
After the flame ignites, visually inspect the
burner assembly to ensure that the flame
is drawn directly into the center of the heat
exchanger
tube, as shown in Figure 23.
The end of the flame will be out of sight
around the bend of the heat exchanger
tube. In a properly adjusted burner assem-
bly, the flame color should be blue with
some light yellow streaks near the outer
portions of the flame.
Type of Fuel
Manifold
Pressure
in. WC
Natural Gas:
3.5
Propane (LP) Gas:
10.0
Table 7. Manifold Pressure
NOTE: Until all of the air is bled out of the gas
line, the hot surface ignitor may not ignite the
gas.
If the ignition control locks out, turn the
thermostat
to its lowest setting and wait one
minute then turn the thermostat to a point above
room temperature
and the ignitor will try again
to ignite the main burners.
This process may
have to be repeated several times before the
burners will ignite.
Once the burners are lit,
check all gas connections
for leaks again with
the soap and water solution.
If the solution
bubbles
there is a gas leak which
must be
corrected.
Do not use an open flame to check
for gas leaks.
Manifold Pressure
The gas valve for the M3 furnace
series is
equipped
with a special
conversion
pres-
sure regulator
cap. The pressure
regulator
cap is factory
set. if the gas valve
is con-
verted
from natural
gas to propane
gas or
vise versa, the manifold
pressure
of the gas
valve will be set to pressure
listed in Table 7.
COMPLETING
THE CONVERSION
1.
Affix the gas valve conversion
label found
in the package with the orifices to the unit
rating plate.
2.
Run the appliance
through
a complete
cycle to assure proper operation.
CAUTION:
To avoid
electric
shock,
personal
injury, or death, turn
off the power at
the disconnect
or the main
service
panel
before
making
any
electrical
connections,
ELECTRICAL
WIRING
General
Electrical connections
must be made in accor-
dance with all applicable
local codes and ordi-
nances, and with the current
revision of the
National Electric Code (ANSI/NFPA
70).
For Canadian
installations
electrical
connec-
tions and grounding
must be done in accor-
dance
with the current
Canadian
Electrical
Code (CSA C22.1 Part 1) and/or local codes.
If
24
Hide quick links:
Advertisement
Table of Contents
