Carrier 30HL - Cooler Head Bolt Tightening

Tube information:
in.
(mm)
Tube sheet hole diameter.
.... 0.631
(16.03)
Tube OD.
. 0.625
(15.87)
Tube ID after rolling.
. 0.581
(14.76 to
(includes expansion due
to
14.94)
to clearance)
0.588
NOTE: Tubes next to gasket webs must be Hush
with tube sheet (both ends).
Tightening Cooler Head Bolts
GASKET PREPARATION
When reassembling, use new gaskets. Com¬
pressed asbestos/ neoprene gaskets. Carrier Material
Specification ZAOO-24, are to be momentarily
dipped in compressor break-in oil prior to assembly.
Do not soak gaskets in oil as gasket deterioration
results. Use dipped gaskets within 30 minutes to
prevent deterioration.
BOLT TORQUES
Apply the following torques during bolt tighten¬
ing sequence described below:
1/2-in. diameter flange bolts. 70 - 90 lb ft
BOLT TIGHTENING SEQUENCE (Fig. 11)
The following is a recommended bolt tightening
sequence:
Step 1 — Tighten moderately (without torquing)
all the flange bolts in sequence shown.
Step 2 — Repeat Step 1, tightening bolts to speci¬
fied torque.
^ Fig. 11 —Tightening Sequence,
Cooler Head Bolts
Fig. 10 — Elliott Tube Plug
13
1090