International comfort products NAHB00101MH Installation Instructions Manual page 15

When correct input is obtained, make sure cap that conceals
gas valve regulator adjustment screw is oriented properly for
natural (NAT) gas. The NAT arrow should be pointing toward
gas valve. (See Figure 23)
10. Remove jumper across R and W thermostat connections
to terminate call for heat.
11. Turn furnace gas valve control knob or switch to OFF
position.
12. Turn gas supply manual shutoff valve to OFF position.
13. Turn off furnace power supply.
14. Remove manometer and replace manifold pressure tab
plug. (See Figure 25)
15. Turn furnace gas−valve switch to ON position.
16. Turn on furnace power supply.
17. Set room thermostat to call for heat.
18. Check pressure tap plug for gas leaks when main
burners ignite.
19. Check for correct burner flame. (See Figure 22)
20. Observe unit operation through two complete heating
cycles.
21. See Sequence of Operation in furnace Installation,
Start−Up, and Operating Instructions.
22. Set room thermostat to desired temperature.
23. After making the
adjustments, check and adjust the furnace temperature
rise per the furnace installation instructions.
24. Verify Natural Gas Input Rate By Clocking Gas Meter.
NOTE: Be sure all pressure tubing, combustion-air and vent
pipes, and burner enclosure front are in place when checking
input by clocking gas meter.
a. Calculate high-altitude adjustment (if required).
UNITED STATES
At altitudes above 2000 ft, this furnace has been approved for a
2 percent derate for each 1000 ft above sea level. See Table 2
for derate multiplier factor.
CANADA
At installation altitudes from 2000 to 4500 ft, this furnace must
be derated 5 percent by an authorized Gas Conversion Station
or Dealer.
To determine correct input rate for altitude, see example above
and use 0.95 as derate multiplier factor.
b. Turn off all other gas appliances and pilots.
c. Start furnace and let operate for 3 minutes.
d. Measure time (in sec) for gas meter test dial to
complete one revolution.
e. Refer to Table 4 for cu ft of gas per hr.
f. Multiply gas rate (cu ft/hr) X heating value (Btu/cu ft)
using natural gas heating value from local gas
utility/supplier.
g. Fill in Conversion Responsibility Label (321102-101)
located on inside of main furnace door. Date, name,
and address of organization making the conversion is
required.
h. Check for gas leaks.
443 06 4003 00
required manifold pressure
Specifications subject to change without notice.
Table 2
Altitude Derate Multiplier for U.S.A.
ALTITUDE
FT. M
0–2000 0−610
2001–3000 610−914
3001–4000 914−1219
4001–5000 1219−1524
5001–6000 1524−1829
6001–7000 1829−2134
7001–8000 2134−2438
8001–9000 2438−2743
9001–10,000 2743−3048
*Derate multiplier factors are based on midpoint altitude for altitude range.
WARNING
!
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could result in personal injury
and/or death.
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 may result causing property damage, personal
injury or loss of life.
AVERTISSEMENT
!
RISQUE D'EXPLOSION ET D'INCENDIE
Le fait de ne pas suivre cet avertissement pourrait entraîner
des dommages corporels et / ou la mort.
Ne jamais examiner pour les fuites de gaz avec une flamme
vive. Utilisez plutôt un savon fait specifiquement pour la
détection des fuites de gaz pour verifier tous les connections.
Un incendie ou une explosion peut entrainer des dommages
matériels, des blessures ou la mort.
LABEL MODIFICATION
NOTE: See Figure 6, Figure 7 and Figure 8 for label location.
1. Fill in Conversion Responsibility Label (334973−101)
previously applied to inside of main furnace door by
installer. Date, name, and address of organization
making this conversion are required. Specify that unit is
now converted for use with natural gas.
2. Place ALL unused parts, adjusting key, and these
Installation Instructions in adhesive pouch attached to
outside of main furnace door or accessible side of
furnace.
3. Reinstall main furnace door.
PERCENT DERATE
MULTIPLIER
OF
FACTOR*
DERATE
0 1.00
4−6 0.95
6−8 0.93
8−10 0.91
10−12 0.89
12−14 0.87
14−16 0.85
16−18 0.83
18−20 0.81
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