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NOTE: All dimensions are in inches.
Fig. 52 — Optional Return
Fan Shipping Brackets
Fig. 51 — Shipping Brackets (Sizes 075-100)
61
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 —
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
/
-in. NPT tapping plug, accessible for test gage connec-
8
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.
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.
Step 17 — Configure Optional Staged Gas
or Modulating Gas Control —
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.
a48-8468
Unit is
The 48P Series large
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