Haier GE APPLIANCES NF80D045S3A, Service Manual, Page: 19 / 30

Page 19
31-5000736 Rev. 0
Proper Combustion
Furnace should operate a minimum 15 minutes with correct
manifold pressure and gas flow rate before checking
combustion. Take combustion sample beyond the flue
out let and compare to Table 8. The maximum carbon
monoxide reading should not exceed 100 ppm.
Capacity CO²% For Nat CO²% For LP
-045
7.2 - 7.8 7.5 - 9.0
-070
-090
-110
Table 8.
Table 9. Manifold Pressure Settings and Pressure Switch
Capacity Gas
Line Pressure
(in. w.c.)
0 - 4,500 ft. 4,501 - 7,500 ft. 7,501 - 10,000 ft.
Min. Max.
Orifice
Size
(in)
Manifold
Pressure
(in w.c.)
Pressure
Switch
Orifice
Size
(in)
Manifold
Pressure
(in w.c.)
Pressure
Switch
Orifice
Size
(in)
Manifold
Pressure
(in w.c.)
Pressure
Switch
045
Nat 4.5 10.0
No Change
0.0625”
3.5
No
Change
No Change
0.0625”
3.5
No
Change
11K45
0.032”
3.5
74W89
-0.55” w.c.
LP/Propane 11.0 13.0
11K50
0.034”
10.0
11K50
0.034
10.0 10.0
070
Nat 4.5 10.0
No Change
0.0625’
3.5
No Change
0.0625”
3.3
11K45
0.032”
3.5
LP/Propane 11.0 13.0
11K50
0.034”
10.0
11K50
0.034
10.0 10.0
090
Nat 4.5 10.0
No Change
0.0625’
3.5
No Change
0.0625”
3.3
11K45
0.032”
3.5
LP/Propane 11.0 13.0
11K50
0.034”
10.0
11K50
0.034
10.0 10.0
110
Nat 4.5 10.0
No Change
0.0625’
3.5
No Change
0.0625”
3.3
74W60
-0.60” w.c.
11K45
0.032”
3.5
LP/Propane 11.0 13.0
11K50
0.034”
10.0
11K50
0.034
10.0
74W60
-0.60” w.c.
10.0
NOTE : A natural to L.P. propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion procedure. NOTE :
High Altitude
The manifold pressure may require adjustment and
combustion air pressure switch may need replacing to
ensure proper combustion at higher altitudes. Refer to
Table 9 for manifold pressure and pressure switch change.
For safety, shut unit off and remove manometer as soon
as an accurate reading has been obtained. Take care to
replace pressure tap plug.
IMPORTANT