Checks And Adjustments - International comfort products N8MPN Installation Instructions Manual

(Figure 26). Insert filter into side clips first and push filter back until
it is fully engaged into back clip.
Top Mounted Internal Filter
Figure 31

12. Checks and Adjustments

Startup
NOTE: Refer to startup procedures in the Users Information
Manual.
WARNING
!
ELECTRICAL SHOCK, FIRE, OR EXPLOSION
HAZARD
Failure to follow this warning could result in
personal injury, death, and/or property damage.
If any sparks, odors or unusual noises occur,
immediately shut OFF gas and power to furnace.
Check for wiring errors or obstruction to blower.
Gas Supply Pressure
Gas supply pressure should be within minimum and maximum
values listed on rating plate. Pressures are usually set by gas
suppliers.
(See Propane Gas Conversion Kit instruction manual for furnaces
converted to Propane gas.)
Manifold Gas Pressure Adjustment
NOTE: Make adjustment to manifold pressure with burners
operating.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in
personal injury, death, and/or property damage.
Turn OFF gas at shut off before connecting
manometer.
1. With gas OFF, connect manometer to manifold pressure tap
on outlet of gas valve. See Figure 32. Use a manometer with
a 0 to 12 in wc range.
441 01 2613 05
9"
Center Clip
side-to-side
Specifications are subject to change without notice
Subject to change without notice.
NOTE: If filters are only suitable for heating application,
advise homeowner that filter size may need to be increased if
air conditioning is added.
Addition Of Air Conditioning
See Section 10.
Figure 32
Typical Gas Valve
Regulator Adjustment
Under Cap
INLET
Inlet
Pressure
1
Tap / NPT
8
2. Turn gas ON. Operate the furnace by using a jumper wire on
the R to W thermostat connection on the control board.
3. Remove manifold pressure adjustment screw cover on
furnace gas valve. Turn adjusting screw counterclockwise to
decrease manifold pressure and clockwise to increase
pressure.
NOTE: Adjustment screw cover MUST be replaced on gas valve
before reading manifold pressure and operating furnace.
4. Set manifold pressure to value shown in Table 6 or Table 7.
5. When the manifold pressure is properly set, replace the
adjustment screw cover on the gas valve.
6. Remove jumper wire from thermostat connection on control
board. Remove manometer connection from manifold
pressure tap, and replace plug in gas valve.
7. Check for leaks at plug.
National Excelsior Company
www.excelsiorhvac.com
Outlet
Pressure
Tap
1
/ NPT
8
OUTLET
27