Route and support all piping in a manner that
relieves stress caused by vibration, thermal expan-
sion, and gradual base or building movement.
Where piping is routed through a roof, construct
a pitch box.
Connecting to One Manifold
Route the discharge line directly to its respective
condenser inlet stub and install a purge valve at
the highest point in the line Route the liquid
return line in a manner providing free trapless
drainage from the condenser to the connection at
the compressor unit. Horizontal piping runs must
be pitched in direction of flow.
Connecting to Two Manifolds
When a compressor unit is served by two sets of
condenser circuits, an expansion loop must be
constructed between the manifolds.
Note: a connection is provided on the rack for
7
¼
8
inch equalizer line. The use of an equalizing
line is left to the discretion of the store engineer.
It is recommended that the condenser manufactur-
er’s installation instructions be consulted. When
used, the equalizing line should have a field sup-
plied check valve installed to prevent flow from
the condenser to the receiver. A shutoff valve
should be installed on the condenser side of the
check valve. Normally, equalizer lines are not
required unless the condensate lines are trapped
and/or undersized.
1. Discharge line: Connect the two inlet stubs
to the discharge line by forming an expan-
sion loop extending at least 12 inches away
from the manifolds. Do not route the dis-
charge line directly in front of the control
panel.
2. Liquid return line: Route each liquid return
line downward at least 6 feet between outlet
stubs before teeing into the main liquid
return line. (Note: If split condenser valving
is not used, drop may be reduced to 2 feet.)
After the tee, route the main liquid return
line in a manner providing free trapless
drainage from the condenser to the connec-
tion at the compressor unit.
Preliminary Electrical Check
Before working on any electric equipment, dis-
connect all power supplies to it and verify that
power is off.
After the condenser is connected to its power sup-
ply, check to see that the supply coming to the
condenser disconnect is acceptable according to
the serial plate. Be sure the disconnect is open and
jumper the fan controls. Close disconnect and
check the following:
• Volt drop and ampere draw
• Leg balance for volts and amperes
• Fan discharge from the top of the
condenser (To reverse, change L1 and L3 at
the motor.)
• (If equipped) Gravity dampers moving freely.
Preliminary Control Setting
Set controls according to the charts in “Control
Settings” for start-up. These settings will need to
be checked and adjusted once the
system is running. The settings listed are
general guidelines and may require some
variation because of local conditions or store
design.
NOTE:
Before starting any compressors be sure
the condenser serving that unit has power and that
all isolation valves are open.
September 1, 1997
P/N 401789
5 - 5
HUSSM ANN CORPORATION • BRIDGETON, M O 63044-2483 • Printed in USA
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