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25
Table 5 — Natural Gas Manifold Pressure Ranges
Table 6 — LP Manifold Pressure Ranges
3
/
4
-in. NPT (National Pipe Thread) field sup-
plied pipe fittings required for Thru-Base gas supply, starting from
the unit gas valve (see Fig. 26).
Pipe gas supply into 90 degree elbow item 15 (see Table 7)
through the hole in the unit basepan.
For typical
3
/
4
-in. NPT field supplied fittings required for NON
Thru-Base gas supply starting from the unit gas valve, omit
items 14 and 15 from Table 7 and pipe gas supply into Tee. See
Fig. 26 — Gas Supply Line Piping with Thru-Base
Fig. 27 — Gas Supply Line Piping
Table 7 — Typical
3
/
4
-in. NPT Field Supplied Piping
Parts
Install a gas supply line that runs to the unit heating section. Refer
to the NFPA 54/NFGC or equivalent code for gas pipe sizing data.
Do not use a pipe smaller than the size specified. Size the gas sup-
ply line to allow for a maximum pressure drop of 0.5 in. wg
(124 Pa) between gas regulator source and unit gas valve connec-
tion when unit is operating at high-fire flow rate.
The gas supply line can approach the unit in two ways: horizontal-
ly from outside the unit (across the roof), or through unit basepan.
Observe clearance to gas line components per Fig. 28.
UNIT MODEL
UNIT SIZE
HIGH FIRE
LOW FIRE
48TC**
17, 20, 24,
28, 30
3.0 in.wg
(747 Pa)
2.0 in.wg
(498 Pa)
UNIT MODEL
UNIT SIZE
HIGH FIRE
LOW FIRE
48TC**
17, 20, 24,
28, 30
11.0 in.wg
(2737 Pa)
7.3 in.wg
(1816 Pa)
CAUTION
EQUIPMENT DAMAGE
Failure to follow this caution may result in equipment damage.
When connecting the gas line to the unit gas valve, the installer
MUST use a backup wrench to prevent damage to the valve.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
ITEM
QTY
DESCRIPTION
1
1
90° Street Elbow
2
1
5 in. Long Nipple
3
1
Ground - Joint Union
4
1
3 in. Long Nipple
5
1
90° Elbow
6
1
12 in. Long Nipple
7
1
90° Elbow
8
1
3 in. Long Nipple
9
1
Tee
10
1
4 in. Long Nipple (Sediment Trap)
11
1
Cap
12
1
3
1
/
2
in. Long Nipple
13
1
NIBCO
*
Ball Valve (PN: GB30)
14
1
8 in. Long Nipple
15
1
90° Elbow
13
12
11
10
9
8
7
6
5
4
3
2
1
Summary of Contents for 48TC D/E17 Series
Page 5: ...5 Fig 2 48TC 17 20 Vertical Airflow...
Page 6: ...6 Fig 3 48TC 17 20 Back View and Condensate Drain Location...
Page 7: ...7 Fig 4 48TC 17 20 Corner Weights and Clearances...
Page 8: ...8 Fig 5 48TC 17 20 Bottom View...
Page 9: ...9 Fig 6 48TC 24 28 Vertical Airflow...
Page 10: ...10 Fig 7 48TC 24 28 Back View and Condensate Drain Location...
Page 11: ...11 Fig 8 48TC 24 28 Corner Weights and Clearances...
Page 12: ...12 Fig 9 48TC 24 28 Bottom View...
Page 13: ...13 Fig 10 48TC 30 Vertical Airflow...
Page 14: ...14 Fig 11 48TC 30 Back View and Condensate Drain Location...
Page 15: ...15 Fig 12 48TC 30 Corner Weights and Clearances...
Page 16: ...16 Fig 13 48TC 30 Bottom View...
Page 19: ...19 Fig 16 Roof Curb Details 17 and 20 Size Units...
Page 20: ...20 Fig 17 Roof Curb Details 24 and 28 Size Units...
Page 21: ...21 Fig 18 Roof Curb Details 30 Size Units...
Page 47: ...47 Fig 52 PremierLink Wiring Diagram...
Page 48: ...48 Fig 53 PremierLink Wiring Diagram with Humidi MiZer System...
Page 49: ...49 Fig 54 Typical RTU Open System Control Wiring Diagram...
Page 50: ...50 Fig 55 Typical RTU Open System Control Wiring Diagram with Humidi MiZer System...
Page 51: ...51 Fig 56 48TC 17 30 Control Wiring Diagram...
Page 52: ...52 Fig 57 48TC 17 30 Power Wiring Diagram 208 230 3 60...
Page 53: ...53 Fig 58 48TC 17 30 Power Wiring Diagram 460 3 60...
Page 54: ...54 Fig 59 48TC 17 30 Power Wiring Diagram 575 3 60...
Page 55: ...55 Fig 60 48TC 17 30 Control Wiring Diagram with Humidi MiZer System...
Page 56: ...56 Fig 61 48TC 17 30 Power Wiring Diagram with Humidi MiZer System 208 230 3 60...
Page 57: ...57 Fig 62 48TC 17 30 Power Wiring Diagram with Humidi MiZer System 460 3 60...
Page 58: ...58 Fig 63 48TC 17 30 Power Wiring Diagram with Humidi MiZer System 575 3 60...