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One of the most common problems in a water/glycol system is the presence of air in the
condenser water loop. Air vents must be installed in various locations the piping system
to purge the air.
Water/glycol system piping may include a centrifugal pump (or pumps for redundancy). Pumps
must be primed before operating per the pump manufacturer’s guidelines.
2.2.1 Field Piping, Glycol System
2.2.2 Connection Sizes, Water/Glycol Cooled Units
Model Number Water In Water Out
GTW or G*007 3/4” O.D. 3/4” O.D.
GTW or G*011 3/4” O.D. 3/4” O.D.
GTW or G*014 1-1/8” O.D. 1-1/8” O.D.
GTW or G*018 1-1/8” O.D. 1-1/8” O.D.
GTW or G*028 1-5/8” O.D. 1-5/8” O.D.
GTW or G*035 1-5/8” O.D. 1-5/8” O.D.
GTW or G*046 1-5/8” O.D. 1-5/8” O.D.
*-D-downow,U-upow
2.2.3 Connection Sizes, Fluid Coolers
Model Number Water In/Out Model Number Water In/Out
GHFC-21 1-5/8” O.D. GHFC-130 2-5/8” O.D.
GHFC-25 1-5/8” O.D. GHFC-141 2-5/8” O.D.
GHFC-32 1-5/8” O.D. GHFC-156 2-1/8” O.D.
GHFC-39 2-1/8” O.D. GHFC-176 2-5/8” O.D.
GHFC-53 2-1/8” O.D. GHFC-200 2-5/8” O.D.
GHFC-60 2-5/8” O.D. GHFC-215 2-5/8” O.D.
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