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Sound Attenuation Pad
For sound sensitive installations, a
vibration pad (field provided) should
be placed beneath the horizontal or
vertical equipment. For the horizontal
unit, the pad should be
approximately twice the size of the
unit foot print. For the vertical unit,
the pad should be 1/2" (12.7 mm)
thick, and equal to the overall unit
foot print.
Hanging the Horizontal
Unit
WARNING
Improper Unit Lift!
Test lift unit approximately 24 inches
to verify proper center of gravity lift
point. To avoid dropping of unit,
reposition lifting point if unit is not
level. Failure to properly lift unit
could result in death or serious injury
or possible equipment or property-
only damage.
To hang the horizontal configuration:
1.
Install the hanging isolators
(located in the return-air section
of the unit) into the four hanging
brackets.
2.
Secure the equipment to a joist,
concrete, etc. with the use of 3/8"
(9.7 mm) field provided (all-
thread) rod. Each corner should
contain field provided nuts and
washers to complete the
hanging installation.
3.
Slope horizontal units in two
directions. The unit should
contain a dual ¼ to 12-inch pitch
toward the drain connection.
This will insure proper drainage
of the unit. All plumbing to the
unit should conform per national
and local codes and is the
responsibility of the contractor.
Condensate Drain
Connection
Install proper trapping to the
equipment. The unit drain
connection is 3/4" (19 mm) for all
GEH and GEV models.
When designing the condensate trap
for the water-source system, it's
important to consider the unit's draw-
52
Installation
thru design requiring negative
pressure trapping.
In a properly trapped system, when
condensate forms during normal
operation, the water level in the trap
rises until there is a constant flow. It
is imperative to maintain water in the
trap and not allow the trap to dry out
during heating season. Keeping trap
primed at all times will enable the
water to flow properly. See
for appropriate dimensions required
in a negative pressure system.
RETURN-AIR
3/8" ALL-THREAD
(BY OTHERS)
3/8" WASHER / NUT
(BY OTHERS)
Figure 52.
Hanging the unit
NEGATIVE PRESSURE TRAPPING
1" (25.4 mm) FOR EVERY 1"
H =
(25.4 mm) OF MAXIMUM
NEGATIVE STATIC PRESSURE
+ 1" (25.4 mm).
J =
HALF OF H.
H + J + PIPE DIAMETER +
L =
INSULATION.
Figure 53.
Negative pressure
system
Supply/Return Pipe
Connections
Connect the supply and return hoses
to the water-inlet (from supply) and
water-outlet (to return) of the unit.
For vibration isolation, it is
recommended that flexible steel
braided hoses be installed instead of
hard piping the equipment to the
main loop system.
Figure 54
connection of a Hays Measurflo®
balancing hose kit to the water-in and
water-out of a vertical unit.
Note:
Figure 54
example
incorporates the Hays
Measurflo® balancing hose
kit and a 2-position isolation
valve into the system design.
An isolation valve is often
used in variable speed
pumping applications. The
isolation valve is designed to
stop water flow to the unit
during non operation times.
This allows the loop water
pumps to run only when a
requirement for pumping is
Figure 53
needed for greater energy
efficiency of the overall
system design.
SUPPLY-AIR
WATER-OUT
WATER-IN
AUTOMATIC BALANCING
HOSE KIT
Figure 54.
Types of Hose
Connections
Whether installing the units in a
central pump (main/auxiliary pump
for the entire zone) design, or as a
distributed pump (1-pump per unit)
design, a shut-off device and flexible
hose is recommended to transition
from the hard piping of the closed or
open loop water system to the unit.
There are multiple hose
combinations which may be used to
fit the design or specification criteria
for the installation.
1.
A steel braided hose without a
shut-off device is the least
expensive means of connecting
the heat pump to the supply/
return water loop.
shows
Figure 55.
RETURN
TO
LOOP
SUPPLY
FROM
CENTRAL
PUMP
Supply/return pipe
connections
RETURN
SUPPLY
Flexible hoses
WSHP-SVX01E-EN
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