International comfort products NAHB00101MH, Installation Instructions Manual

443 06 4003 00

15

Specifications  subject to change without notice.

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 required manifold pressure

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.

Table 2

Altitude Derate Multiplier for U.S.A.

ALTITUDE

PERCENT

OF

DERATE

 DERATE

MULTIPLIER

FACTOR*

FT.

 M

0–2000

 0

−

610

0

1.00

2001–3000

 610

−

914

4

−

6

0.95

3001–4000

 914

−

1219

6

−

8

0.93

4001–5000

 1219

−

1524

8

−

10

0.91

5001–6000

 1524

−

1829

10

−

12

0.89

6001–7000

 1829

−

2134

12

−

14

0.87

7001–8000

2134

−

2438

14

−

16

0.85

8001–9000

2438

−

2743

16

−

18

0.83

9001–10,000

2743

−

3048

18

−

20

0.81

*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.