Additional Lp Connection Requirements; Lp Conversion; Gas Supply Pressure; Manifold Gas Pressure Adjustment - ICP 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 complywith limitation set in
National Fuel Gas Code or CGA codes.
3. Two-stage regulation of LP gas is recommended.
LP Conversion
An accessory kit shall be used to convert to propane gas use, see
the furnace rating plate for the LP conversion accessory kit part
number.
Do NOT allow minimum gas supply pressure to vary down-
ward. Doing so will decrease input to furnace. Refer to
Table 7, Table 8, Table 9, Table 10 and Table 11 for nor-
mal 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.
Manifold Gas Pressure Adjustment
NOTE: Make adjustment to manifold pressure with burners oper-
ating.
FIRE, EXPLOSION, UNIT DAMAGE HAZARD.
Failure to follow this warning can result in
death, property damage and/or personal
injury.
An LP conversion accessory kit is required
when operating the furnace with LP gas.
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 7, 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.
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Alternate Input Ratings, USA ONLY.
BTUH
Standard
Rating
50,000
75,000
100,000
125,000
BTUH
Alternate
Rating
40,000
60,000
80,000
100,000
Natural
Gas
Orifice*
#44
#44
#44
#44
LP
Gas
Orifice**
#55
#55
#55
#55
* See Table 10 for High Altitude.
** See Table 11 for High Altitude
Supply Pressure
ELECTRICAL SHOCK HAZARD.
Failure to do so could result in death or personal
injury.
Turn OFF power to furnace before changing speed
taps.
1,
2.
3.
4.
Remove the burner compartment door.
With gas OFF, connect manometer to tapped opening on
gas valve. See Figure 38. Use manometer with a 0 to 15"
water column range.
Turn gas ON. Operate the furnace by using a jumper wire on
the R to W thermostat connections on the control.
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.
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Typical Gas Control Valve Honeywell
Regulator Adjustment
Under Ca
Inlet
Pressure
Tap 1/8NPT
HONEYWELL
©o
b
Outlet
Pressure
Tap
1/8NPT
/
OUTLET
25-24-98a
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,
2,
A 1/8" NPT plugged tapping, accessible for a test gauge II
connection, must be installed immediately upstream of the
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gas supply connection to the furnace.
Gas input to burners MUST NOT exceed the rated input
shown on rating plate.
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 8, Table 9,
Table 10 or Table 11.
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 the
control board. Remove manometer connection from man-
ifold pressure tap, and replace plug in gas valve.
8. Check for leaks at plug.
9. Replace the burner compartment door.
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