Installation
16 PRGF-SVN001B-EN
connection to the condenser must be the same. For this
reason, the vapor and liquid connections should be
located as closely together as possible to avoid problems
which can result from pressure gradients within the
condenser.
Use 3/8” refrigerant-grade copper tubing and pitch the line
at a mi
nimum rate of 2"/ft. (151 mm/m) toward the
condenser. Avoid vertical runs of copper tubing.
On units with internal purge pickup points, the liquid
return
shoul
d be located close to the corresponding
internal pickup location.
WARNING
Explosion Hazard and Deadly Gases!
Failure to follow all proper safe refrigerant handling
practices could result in death or serious injury. Never
solder, braze or weld on refrigerant lines or any unit
components that are above atmospheric pressure or
where refrigerant may be present. Always remove
refrigerant by following the guidelines established by
the EPA Federal Clean Air Act or other state or local
codes as appropriate. After refrigerant removal, use dry
nitrogen to bring system back to atmospheric pressure
before opening system for repairs. Mixtures of
refrigerants and air under pressure may become
combustible in the presence of an ignition source
leading to an explosion. Excessive heat from soldering,
brazing or welding with refrigerant vapors present can
form highly toxic gases and extremely corrosive acids.
Refrigerant Line Installation Procedure
The following procedure is recommended when making
EarthWise™ purge refrigerant line connections. Refer to
Figure 13.
1. Weld the 7/8” ID machined-s
teel coupling (for purge
vapor
line) to the condenser shell at the appropriate
point on the shell. Be sure to slope properly (refer to
“Purge Vapor Line Construction").
2. Weld the 3/8” pipe coupling (for liquid return line) to
the conde
nser
shell near the gas line outlet connection
(see Step 1 above).
3. Drill a 7/8” (22 mm) hole through the purg
e vapor line
coupling into the condenser shell.
CAUTION
Tube Damage!
To prevent condenser tube damage, use extreme
caution when enlarging outlet opening.
4. Drill a 3/8” (10 mm) hole through
the liquid line
coupling into the condenser shell.
CAUTION
Tube Damage!
Use extreme caution when drilling into condenser to
avoid damage to internal tubes.
5. Braze the 7/8” elbow into the coupling
and the 5/
8”
reducer into the elbow. Install 5/8” copper tubing and
the 5/8” ball valve. Be certain to maintain proper pitch
to the purge connection point (refer to “Purge Vapor
Line Construction").
6. Install the 3/8” angle valve on
the 3/8” liquid return
coupling.
7. Install the factory provided 3/8” liqui
d line, filter drier
and moisture indicating sight glass as shown in
Figure 7.
Note: The face of the
moisture indicati
ng sight glass
should be pointed slightly downward to assure
liquid contact with internal moisture sensor.
8. Install 3/8” copper tubing fr
om th
e purge to the 3/8”
liquid return angle valve.
Other hardware that may be provided
for alternate
installation setups can be used only if careful attention is
paid to the two major points discussed under “General
Recommendations,” p. 15.
In applications where the mechanical room is warm
en
ough to
cause liquid refrigerant in the liquid return line
to boil (causing vapor lock), it is advisable to insulate the
liquid return line. It is also advisable to insulate the liquid
return line for all duplex chillers and chillers with water
flow in series.
Figure 12. EarthWise™ purge gas and liquid lines, for
single c
ondenser chiller
Auxiliary Condenser and Heat
Recovery Units
Important: Be sure to follow all applicable codes when
installing discharge vent line.
When the EarthWise purge system is applied to a heat
recovery un
it or a unit with an auxiliary condenser, some
additional considerations must be taken into account.
Purge Tank
12”
2”
Condenser
Purge Gas
Line
5/8” Ball Valve
7/8” Elbow and
5/8” Reducer
7/8” Steel
Coupling
3/8” Angle
Valve
Maintain a Pitch
of 2”/12” (151 mm/m)
or more
SIDE VIEW
FRONT VIEW
5/8” Purge
Gas Line
3/8” Liquid
Return Line
Chiller
Condenser
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