Electric Shock Hazard - International comfort products N9MP1 Installation Instructions Manual

Additional LP Connection Requirements
1. Have a licensed LP gas dealer make all connections at stor-
age tank and check all connections from tank to furnace.
2. If copper tubing is used, it MUST comply with limitation set in
National Fuel Gas Code or CGA codes.
3. Two--stage regulation of LP gas is recommended.
Alternate BTUH Input Ratings (USA Only)
The input rating of these furnaces can be changed from the stan-
dard input rating to the alternate input rating shown in Table 6, by
changing the main burner orifices. Changing of burner orifices
MUST be done by a qualified service technician. See section on
changing orifices or following page.
Table 6 Alternate Input Ratings, USA ONLY.
BTUH BTUH
Standard Alternate
Rating Rating
50,000 40,000
75,000 60,000
100,000 80,000
125,000
100,000
* See Table 9 for High Altitude.
** See Table 10 for High Altitude
Supply Pressure
WARNING
!
FIRE HAZARD
Failure to properly set input pressure could result in
death, personal injury and/or property damage.
Do NOT set input rating above that shown on rating
plate.
1
1. A / ² NPT plugged tapping, accessible for a test gauge
8
connection, must be installed immediately upstream of the
gas supply connection to the furnace.
2. Gas input to burners MUST NOT exceed the rated input
shown on rating plate.
3. Do NOT allow minimum gas supply pressure to vary down-
ward. Doing so will decrease input to furnace. Refer to
Table 6, Table 7, Table 8, Table 9 and Table 10 for normal
gas supply and manifold pressures.
Gas Supply Pressure
Gas supply pressure should be within minimum and maximum val-
ues listed on rating plate. Pressures are usually set by gas suppli-
ers.
440 01 1021 01
Natural LP
Gas Gas
Orifice* Orifice**
#44 #55
#44 #55
#44 #55
#44 #55
Manifold Gas Pressure Adjustment
NOTE: Make adjustment to manifold pressure with burners oper-
ating.
WARNING
!
ELECTRICAL SHOCK HAZARD.
Failure to do so could result in death or personal
injury.
Turn OFF power to furnace before changing speed
taps.
1. Remove the burner compartment door.
2. With gas OFF, connect manometer to tapped opening on
gas valve. See Figure 37. Use manometer with a 0 to 15²
water column range.
3. Turn gas ON. Operate the furnace by using a jumper wire on
the R to W thermostat connections on the control.
4. Remove manifold pressure adjustment screw cover on fur-
nace gas control valve. Turn adjusting screw counterclock-
wise to decrease manifold pressure and clockwise to
increase pressure.
Typical Gas Control Valve Honeywell
Figure 37
RegulatorAdjustment
Under Cap
V
T
INLET
Inlet
Pressure
1
Tap / NPT
8
NOTE: Adjustment screw cover MUST be replaced on gas control
valve before reading manifold pressure and operating furnace.
5. Set manifold pressure to value shown in Table 7, Table 8,
Table 9 or Table 10.
6. When the manifold pressure is properly set, replace the ad-
justment screw cover on the gas control valve.
7. Remove jumper wire from thermostat connection on fan
board. Remove manometer connection from manifold
pressure tap, and replace plug in manifold.
8. Check for leaks at plug.
9. Replace the burner compartment door.
Outlet
HONEYWELL
Pressure
Tap
1
/
8
OUTLET
ON
OFF
25--24--98a
NPT
33