Installation
56
WSHP-SVX01L-EN
Condensate Drain Connection
Install proper trapping to the equipment. The unit drain
connection is ¾ in. NPT for all GEV and ½ - 5 ton GEH and
EXH/V 1½-6 ton models. For 6-15 ton GEH models, the
drain connection is ½ in. PVC schedule 40 pipe.
When designing the condensate trap for the water-source
system, it is important to consider the unit draw-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 Figure 54, p. 59 for
appropriate dimensions required in a 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 55, p. 56
shows connection of a Hays Measurflo® balancing hose
kit to the water-in and water-out of a vertical unit.
Note:
Figure 55, p. 56
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
needed for greater energy efficiency of the overall
system design.
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.
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.
With the addition of a shut-off device on the supply and
return of the system, the unit may be isolated during
service or maintenance situation. This system may be
installed as a wide open (full water flow to the equipment)
design, or manually balanced by utilizing the pressure/
temperature ports on the top of the ball valve/shut-off
device.
Figure 54.
Negative pressure system
Figure 55.
Supply/return pipe connections
RETURN
TO
LOOP
SUPPLY
FROM
CENTRAL
PUMP
AUTOMATIC BALANCIN
G
HOSE KIT
WATER-IN
WATER-OUT
Flexible hoses
Deluxe ball valve hose kit
Supply
Return
B
a
ll V
a
lve w/PT
B
a
ll V
a
lve w/PT
Opt
i
on
a
l
Str
ai
ner/
Blowdown V
a
lve
w/Hose Conne
c
tor
V
a
lve Body
A
c
tu
a
tor
Summary of Contents for Axiom EXH018
Page 117: ......
