Verify Manifold Pressure; Input Check And Adjustment - Trane 4YCZ6036A Installer's Manual

Single packaged gas/electric 16 seer convertible, 3 - 5 ton, 64 - 120 kbtu r-410a
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Installer's Guide
4. Before connecting the piping circuit to the unit, bleed the air
from the supply line and then cap or plug the line and test the
pressure at the tapped shut-off cock. The pressure reading
should not exceed 14 inches water column.
5. Using an appropriate backup wrench on the gas valve inlet boss,
connect the gas piping to the unit. Check the completed piping
for leaks using a soap and water solution or the equivalent.
6. After installation of the gas pipe in the unit, the pipe opening
should be closed with the filler/barrier plug provided.
Manifold Pressure
Check the manifold pressure at the unit gas valve. Do not exceed
the recommended pressure shown on the unit nameplate.

Input Check and Adjustment

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 (in cfh) Table 3, with the
time clocked.
4. Read the "Flow" column opposite the number of seconds
clocked.
5. Use the following factors if necessary.
For 1 Cu. Ft. Dial Gas Flow CFH =
For 1/2 Cu Ft. Dial Gas Flow CFH =
For 5 Cu. Ft. Dial Gas Flow CFH =
NOTE: For manifold pressures and orifice sizes for gas with other
BTU ratings, contact the local gas utility. Manifold
pressure should be 1.8 (low) to 3.5 (high) inches water column
(+0.1). Input for natural gas must not exceed the value shown on
the unit nameplate.
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.
7. Changes can be made by adjusting the manifold pressure.
Outlet Pressure Boss
Inlet Pres-
sure Boss
Gas Valve
ON/OFF
High Fire Coil
Toggle
Terminal (H)
Switch
Page 18
Chart Flow Reading
2
Chart Flow Reading
4
10X Chart Flow Reading
4
2nd Stage (HI)
Manifold Pressure
Adjustment
Regulator
Vent
1st Stage
(LO)
Manifold
Pressure
Adjustment
Coaxial Coil
Terminal (M)
Common
Terminal (C)
Figure 18. Burner and Valve
a. Attach a manifold pressure gauge.
b. Remove the slot screw on top of the gas valve for 1st stage
manifold pressure adjustment. Remove slot screw on outlet
side for 2nd stage adjustment (See Figure 18).
c. Turn the adjustment nut in to increase the gas flow rate, and
out to decrease the gas flow rate using a 3/32" hex wrench.
Table 3. Gas Flow in Cubic Feet Per Hour
2 Cubic Foot Dial
Sec.
Flow
Sec.
Flow
8
900
29
248
9
800
30
240
10
720
31
232
11
655
32
225
12
600
33
218
13
555
34
212
14
514
35
206
15
480
36
200
16
450
37
195
17
424
38
189
18
400
39
185
19
379
40
180
20
360
41
176
21
343
42
172
22
327
43
167
23
313
44
164
24
300
45
160
25
288
46
157
26
277
47
153
27
267
48
150
28
257
49
147
Sec.
Flow
Sec.
Flow
50
144
82
88
51
141
84
86
52
138
86
84
53
136
88
82
54
133
90
80
55
131
92
78
56
129
94
76
57
126
96
75
58
124
98
73
59
122
100
72
60
120
104
69
62
116
108
67
64
112
112
64
66
109
116
62
68
106
120
60
70
103
124
58
72
100
128
56
74
97
132
54
76
95
136
53
78
92
140
51
80
90
144
50

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