Combustion And Input Check; Gas Valve Adjustment - Trane A952V040BU3SB Installation, Operation And Maintenance Manual

F F u u r r n n a a c c e e G G e e n n e e r r a a l l I I n n s s t t a a l l l l a a t t i i o o n n

Combustion and Input Check

1. Make sure all gas appliances are off except the
furnace.
2. Clock the gas meter with the furnace operating
(determine the dial rating of the meter) for one
revolution.
3. Match the "Sec" column in the gas flow table with
the time clocked.
4. Read the "Flow" column opposite the number of
seconds clocked.
5. Use the following factors if necessary:
a. For 1 Cu. Ft. Dial Gas Flow CFH = Chart Flow
Reading ÷ 2
b. For 1/2 Cu Ft. Dial Gas Flow CFH = Chart Flow
Reading ÷ 4
c. For 5 Cu. Ft. Dial Gas Flow CFH = 10X Chart Flow
Reading ÷ 4
6. Multiply the final figure by the heating value of the
gas obtained from the utility company and compare
to the nameplate rating. This must not exceed the
nameplate rating.
Gas Flow in Cubic Feet Per Hour
2 Cubic Foot Dial
Sec. Flow Sec. Flow
10 732 31 236
11 666 32 229
12 610 33 222
13 563 34 215
14 523 35 209
15 488 36 203
16 458 37 198
17 431 38 193
18 407 39 188
19 385 40 183
20 366 41 179
21 349 42 174
22 333 43 170
23 318 44 166
24 305 45 163
25 293 46 159
26 282 47 156
27 271 48 153
28 262 49 149
29 253 50 146
30 244 51 144
36
Sec. Flow Sec. Flow
52 141 86 85
53 138 88 83
54 136 90 81
55 133 94 78
56 131 98 75
57 128 100 73
58 126 104 70
59 124 108 68
60 122 112 65
62 118 116 63
64 114 120 61
66 111 130 56
68 108 140 52
70 105 150 49
72 102 160 46
74 99 170 43
76 96 180 41
78 94 190 39
80 92 200 37
82 89
84 87

Gas Valve Adjustment

Changes can be made by adjusting the manifold
pressure, or changing orifices (orifice change may not
always be required). To adjust the manifold pressure:
1. Turn off all electrical power to the system.
2. Loosen (Do Not remove) the pressure tap test set
screw one turn with 3/32" hex wrench.
a. The pressure tap adjustment kit (KIT07611)
contains a 3/32" hex wrench, a 5/16" hose and a
connector and can be ordered through Global
Parts.
3. Attach a manifold pressure gauge with flexible
tubing to the outlet pressure boss marked "OUT P"
on White- Rodgers gas valve model 36J.
4. Turn on system power and energize valve.
I I m m p p o o r r t t a a n n t t : : Adjust 2nd stage on the gas valve before
attempting to adjust 1st stage.
5. Adjust 2nd stage gas heat by removing the high (HI)
adjustment regulator cover screw.
a. To increase outlet pressure, turn the regulator
adjust screw clockwise.
b. To decrease outlet pressure, turn the regulator
adjust screw counterclockwise.
c. Adjust regulator until pressure shown on
manometer matches the pressure specified in
the table.
The input of no more than nameplate rating and
no less than 93% of the nameplate rating, unless
the unit is derated for high altitude.
d. Replace and tighten the regulator cover screw
securely.
6. Adjust 1st stage gas heat by removing the low (LO)
adjustment regulator cover screw.
a. To increase outlet pressure, turn the regulator
adjust screw clockwise.
b. To decrease outlet pressure, turn the regulator
adjust screw counterclockwise.
c. Adjust regulator until pressure shown on
manometer matches the pressure specified in
the table.
The input of no more than nameplate rating and
no less than 93% of the nameplate rating, unless
the unit is derated for high altitude.
d. Replace and tighten the regulator cover screw
securely.
7. Cycle the valve several times to verify regulator
setting.
a. Repeat steps 5-7 if needed.
8. Turn off all electrical power to the system.
9. Remove the manometer and flexible tubing and
tighten the pressure tap screw.
A952V-SVX001-1B-EN