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After removing all shipping brackets, level the fan using the
adjustment screws. On all 4 corners the dimension from cross
rail to fan sled should be as shown in Fig. 52.
Step 16 — Connect Gas Piping —
Unit is
equipped for use with natural gas only. Installation must con-
form with local building codes, or in the absence of local
codes, with the National Fuel Gas Code (NFGC), ANSI
Z223.1.
A
1
/
8
-in. NPT tapping plug, accessible for test gage connec-
tion, must be field installed immediately upstream of gas sup-
ply connection to unit, but after manual gas valve. See Fig. 53.
Natural gas pressure at unit gas connection must not be less
than 5 in. wg or greater than 13 in. wg.
Size gas supply piping for 0.5 in. wg maximum pressure
drop. Do not use supply pipe smaller than unit gas connection.
Step 17 — Configure Optional Staged Gas
or Modulating Gas Control —
The 48P Series large
rooftop units may be ordered with an optional factory-installed
staged gas or modulating gas control system that monitors
heating operation of the rooftop.
Refer to the Unit Controls and Troubleshooting book for in-
formation on configuring staged gas or modulating gas control.
Fig. 51 — Shipping Brackets (Sizes 075-100)
a48-8468
Fig. 52 — Optional Return
Fan Shipping Brackets
NOTE: All dimensions are in inches.
CAUTION
Disconnect gas piping from unit when leak testing at pres-
sures greater than 0.5 psig. Pressures greater than 0.5 psig
will cause gas valve damage resulting in a hazardous con-
dition. If gas valve is subjected to pressure greater than
0.5 psig, it must be replaced.
Summary of Contents for WEATHER MASTER 48P2
Page 10: ...10 Fig 1 Roof Curb Sizes 030 050...
Page 11: ...11 Fig 2 Roof Curb Sizes 055 060...
Page 12: ...12 Fig 3 Roof Curb Sizes 070 100...
Page 13: ...13 Fig 4 Condenser Section Roof Curb Sizes 070 and 075...
Page 14: ...14 Fig 5 Condenser Section Roof Curb Sizes 090 and 100...
Page 21: ...21 Fig 12 Base Unit Dimensional Drawing 48P2 P3030 035 Standard Chassis Unit Shown a48 8613...
Page 22: ...22 Fig 13 Base Unit Dimensional Drawing 48P4 P5030 035 Standard Chassis Unit Shown a48 8614...
Page 23: ...23 Fig 14 Base Unit Dimensional Drawing 48P2 P3040 050 Standard Chassis Unit Shown a48 8615...
Page 24: ...24 Fig 15 Base Unit Dimensional Drawing 48P4 P5040 050 Standard Chassis Unit Shown a48 8616...
Page 25: ...25 Fig 16 Base Unit Dimensional Drawing 48P2 P3055 060 Standard Chassis Unit Shown a48 8617...
Page 26: ...26 Fig 17 Base Unit Dimensional Drawing 48P4 P5055 060 Standard Chassis Unit Shown a48 8618...
Page 27: ...27 Fig 18 Base Unit Dimensional Drawing 48P2 P3070 Standard Chassis Unit Shown a48 8619...
Page 28: ...28 Fig 19 Base Unit Dimensional Drawing 48P4 P5070 Standard Chassis Unit Shown a48 8620...