COMPRESSORS
On some units the compressor is mounted on springs which
have been tightened down for shipment only.
After this unit is installed, back out the compressor bolts until
the sleeve clears the top grommet.
CAUTION: Do Not loosen compressor mounting bolts.
COMBUSTION DISCHARGE
The products of combustion are discharged horizontally
through a screened (hooded) opening on the gas heat access
panel.
GAS PIPING
Proper sizing of gas piping depends on the cubic feet per hour
of gas flow required, specific gravity of the gas and the length
of run. “National Fuel Gas Code” Z223.1 or CAN/CGA B149.1
or .2 should be followed in all cases unless superseded by local
codes or gas company requirements. Refer to Tables 4 and 5.
The heating value of the gas may differ with locality. The value
should be checked with the local gas utility.
NOTE: There may be a local gas utility requirement specifying
a minimum diameter for gas piping. All units require a
1/2 inch pipe connection at the gas valve.
GAS CONNECTION
The gas supply line can be routed through the hole located on
the right side of the unit. Refer to Figure 5 to locate these
access openings. Typical supply piping arrangements are
shown in Figure 3.
Gas piping recommendations:
1. A drip leg and a ground joint union must be installed in the
gas piping.
2. When required by local codes, a manual shut-off valve may
have to be installed outside of the unit.
3. Use wrought iron or steel pipe for all gas lines. Pipe dope
should be applied sparingly to male threads only.
WARNING:Natural gas may contain some propane. Propane,
being an excellent solvent, will quickly dissolve
white lead or most standard commercial com-
pounds. Therefore, a special pipe dope must be
applied when wrought iron or steel pipe is used.
Shellac base compounds such as Gaskolac or
Stalastic, and compounds such as Rectorseal #5,
Clyde’s or John Crane may be used.
Input
Capacity
(Mbh)
Output
Capacity
(Mbh)
Available
On
Models
Gas
Rate
1
Ft.
3
/Hr.
Temp. Rise
°
F
At Full Input
2
Min.
Max.
36
28
1
1
⁄
2
& 2 TON
37
15
45
36
28
2
1
⁄
2
TON
37
15
45
54
42
2 TON
56
20
50
54
42
2
1
⁄
2
TON
56
25
55
54
42
3 TON
56
20
50
75
60
2
1
⁄
2
3 TON
74
25
55
75
60
3
1
⁄
2
TON
74
25
55
90
70
3&3
1
⁄
2
TON
93
25
55
1
Based on 1075 BTU/Ft.
3
.
2
The air flow must be adjusted to obtain a temperature rise within the range shown.
TABLE 2 - NATURAL GAS APPLICATION DATA
Input
Capacity
(Mbh)
Output
Capacity
(Mbh)
Available
On
Models
Gas
Rate
1
Ft.
3
/Hr.
Temp. Rise
°
F
At Full Input
2
Min.
Max.
36
28
1
1
⁄
2
& 2 TON
16
15
45
36
28
2
1
⁄
2
TON
16
15
45
54
42
2 TON
24
20
50
54
42
2
1
⁄
2
TON
24
25
55
54
42
3 TON
24
20
50
75
60
2
1
⁄
2
3 TON
32
25
55
75
60
3
1
⁄
2
TON
32
25
55
90
70
3&3
1
⁄
2
TON
40
25
55
1
Based on 2500 BTU/Ft.
3
.
2
The air flow must be adjusted to obtain a temperature rise within the range shown.
TABLE 3 - PROPANE (LP) GAS APPLICATION DATA
Length
in
Feet
Nominal Inches Iron Pipe Size
1/2 in.
3/4 in.
1 in.
1-1/4 in.
10
132
278
520
1,050
20
92
190
350
730
30
73
152
285
590
40
63
130
245
500
50
56
115
215
440
60
50
105
195
400
70
46
96
180
370
80
43
90
170
350
90
40
84
160
320
100
38
79
150
305
Maximum Capacity of Pipe in Cubic Feet of Gas Per Hour (Based Upon A Pressure Drop
of 0.3 Inch Water Column and 0.6 Specific Gravity Gas).
TABLE 4 - NATURAL GAS PIPE SIZING CHART
Length
in
Feet
Nominal Inches Iron Pipe Size
1/2 in.
3/4 in.
1 in.
1-1/4 in.
10
275
567
1,071
2,205
20
189
393
732
1,496
30
152
315
590
1,212
40
129
267
504
1,039
50
114
237
448
913
60
103
217
409
834
70
96
196
378
771
80
89
185
346
724
90
83
173
322
677
100
78
162
307
630
Maximum Capacity of Pipe in Thousands of BTU Per Hour (Based Upon A Pressure Drop
of 0.5 Inch Water Column).
TABLE 5 - PROPANE (LP) GAS PIPE SIZING CHART
FIG. 3 - EXTERNAL SUPPLY CONNECTION
EXTERNAL SHUT-OFF
AUTOMATIC
GAS VALVE
1
⁄
2
-14 NPT
530.44-N5Y
Unitary Products Group
5
