Hussmann Super Plus - Special Piping for Open Rooms; Connecting Parallel 3-Way Valves; Run Lengths and Equivalent Feet

For an expansion loop, multiply the “L” value
by 2 if hard copper and long radius elbows are
used. If the the expansion loop is formed in
soft copper, the loop diameter equals “L”.
Example:
For the same 84 foot run, a hard copper loop
is 42 by 42 inches. A soft copper loop is
21 inches.
Application
Do not exceed a 100 foot straight run without
constructing an offset or expansion loop.
Place the offset or loop in the middle of the
run to minimize pipe shift and joint stress.
SPECIAL PIPING FOR OPEN ROOMS
An open preparation room allows heat infiltra-
tion from the rest of the store at a rate which
may jeopardize total refrigeration perfor-
mance. Open preparation evaporators must be
piped with a Crankcase Pressure Regulating
Valve (CPR) to protect the rest of the refriger-
ation system.
The CPR is field installed in the suction
line(s) from the evaporator(s). The installer is
responsible for proper adjustment of the Valve
(see “Control Valve” Section for adjustment
procedures).
CONNECTING PARALLEL 3-WAY
VALVES
Due to the size limitations of 3-Way Va l v e s ,
some of the larger Koolgas systems will
require parallel connection to two suction
stubs at the header, using an offset tee con-
struction. Do not use a bull head tee.
RUN LENGTHS AND EQUIVA L E N T
FEET
When figuring run lengths angle valves and
elbow 90˚ are figured as additional straight
pipe. The chart below gives equivalent lengths
for these components.
COMPONENT PIPING Revised August 1, 1996
3 - 8
Table 3-2 Equivalent Feet for
Angle Valve and Elbow-90˚*
*ASHRAE Fundamentals Handbook
Tubing Angle Long Radius
Size Valve Elbow-90˚
1
⁄2 6 0.9
5
⁄8 7 1.0
7
⁄8 9 1.4
1
1
⁄8 12 1.7
1
3
⁄8 15 2.3
1
5
⁄8 18 2.6
2
1
⁄8 24 3.3
2
5
⁄8 29 4.1
3
1
⁄8 35 5.0
3
5
⁄8 41 5.9
4
1
⁄8 47 6.7
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA