International comfort products N9MP1 Installation Instructions Manual page 37

High Altitude Input Rate =
Nameplate Sea Level Input Rate x (Multiplier) [USA]
Elevation
ft (m)
Natural Gas
2001' - 3000'
(609.9 − 914.4)
3001' - 4000'
(914.7 − 1219.2)
4001' - 5000'
(1219.5 − 1524)
5001' - 6000'
(1524.3 − 1828.8)
6001' - 7000'
(1829.1 − 2133.6)
7001' - 8000'
(2133.9 − 2438.4)
* Based on mid−range of elevation.
4. In cases where Table 9 or Table 10 is not applicable, eg.
alternate input rate application, refer to
Table 12 for required high altitude input rate.
High Altitude Air Pressure Switch
Altitudes over 4,000' (1219.2m) may require a different air
pressure switch than the one installed at the factory. Check parts
list for pressure switch and consult your distributor for part number
and availability. In Canada, provincial codes may govern
installation of switch. Check with governing authorities.
Changing Orifices for High Altitude
WARNING
!
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow this warning could result in
personal injury, death, and/or property damage.
Turn OFF electric power at fuse box or service
panel and gas supply at manual valve in gas valve,
lockout and tag switch with a suitable warning
label, when installing orifices. Installation of
orifices requires a qualified service technician.
NOTE: Main burner orifices can be changed for high altitudes.
1. Disconnect gas line from gas valve.
2. Remove manifold from furnace.
3. Remove the orifices from the manifold and replace them
with properly sized orifices.
4. Tighten orifices so it is seated and gas tight. (See
Figure 33)
5. Reinstall manifold. Ensure burners do NOT bind on new
orifices.
Changing Orifices
Figure 33
1.11" (28.2mm)
1.21" (30.8mm)
440 01 1024 04
High Altitude Multiplier
Propane Gas
0.95 0.90
0.93 0.86
0.91 0.82
0.89 0.78
0.87 0.74
0.85 0.70
Table 11 or
Measure from face of orifice
to the back side of the
manifold.
Specifications are subject to change without notice
Natural Gas Input Rating Check
SEE CHECKS AND ADJUSTMENTS, Natural Gas Input Rating
Check in this manual.
Final Gas Piping Check
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in
personal injury, death, and/or property damage.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made
specifically for the detection of leaks to check all
connections. A fire or explosion could result
causing property damage, personal injury and/or
loss of life.
1. The furnace and the equipment shut off valve must be
disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess
1
of / " PSIG. Close the manual shut−off valve before testing
2
at such pressures.
2. When installation is complete, test all pipe connections for
leaks with the gas pressure less than
valve.
3. The furnace must be isolated from the gas supply system by
closing the equipment shut off valve during any pressure
testing of the gas supply system at test pressure equal to or
1
less than / " PSI.
2
4. Apply a commercial soap solution to all joints to test for
leaks. Correct any leaks indicated by bubbles.
5. Correct even the smallest leak at once.
6. Check for leaks at gas valve and orifice connections to the
burner manifold while the furnace is operating.
AVERTISSEMENT
!
RISQUE D'INDENDIE OU D'EXPLOSION
Le non−respect des avertissements de sécurité
pourrait d'entrainer des blessures graves, la mort
ou des dommages matériels.
Ne jamais utiliser une flamme nue por vérifier la
présence des fuites de gaz. Pour la vérification de
tous les joints, utiliser plutôt une solution
savonneuse commerciale
spécifiquement pur la détection des fuites de gaz.
Un incendie ou une explosion peut entrainer des
dommages matériels, des blessures ou la mort.
1
/ " PSIG to the gas
2
fabriquée
37