Installation
14
WSHP-SVX02E-EN
Using Antifreeze
In areas of the country where entering water temperatures
drop below 45°F or where piping is being run through
areas subject to freezing, the loop must be freeze
protected by using an approved antifreeze solution to
prevent the earth loop water from freezing inside the heat
exchanger. Methanol and glycols are the most commonly
used antifreeze solutions. Consult your geothermal unit
supplier for locally approved solutions in your area.
Propylene glycol is not recommended in installations
where the water temperature are expected to fall below
30°F. At extreme temperatures, the viscosity increases to
the point where normal loop circulating pumps may not
maintain proper flow.
If propylene glycol is the only locally approved solution for
anti-freeze, good engineering practices should be used to
achieve the desired flow.
Calculate the approximate volume of water in the system
by using the requirements detailed in table Water volume
in Operating Data chapter. Add three gallons to this total
to allow for the water contained in the hose kit and
geothermal unit.
Table 2.
Antifreeze requirements based on volume
Type of
Antifreeze
Minimum Temperature for Freeze
Protection
10°F
15°F
20°F
25°F
30°F
Methanol
25%
21%
16%
10%
3%
Propylene Glycol
—
—
—
—
6%
Cleaning and Flushing the Water Loop
All installations must be thoroughly flushed to remove air
and dirt from the earth loop before running the system.
The loop must be flushed with a high volume of water at
a minimum velocity of (2 feet per second) in both
directions. Refer to the below table for flow rates required
to flush earth loops.
Table 3.
System flushing flow rates
Pipe
Gallons per
100 Ft.
Minimum Flush
GPM
¾” PE
3.02
3.8
1" PE
4.73
6.0
1¼” PE
7.55
9.5
1½ PE
9.93
13.0
2" PE
15.36
21.0
Field Installed Power Wiring
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury.
When it is necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been properly trained in
handling live electrical components perform these
tasks.
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as the equipment was not
designed or qualified to accept other types of
conductors.
Verify that the power supply available is compatible with
the unit’s nameplate. Use only copper conductors to
connect the power supply to the unit.
Main Unit Power Wiring
A field supplied disconnect switch must be installed at or
near the unit in accordance with the National Electric Code
(NEC latest edition).
Location of the applicable electric service entrance for
HIGH (line voltage) may be found on the unit submittal at
the front of this manual.
The high voltage connection is made at the 1TB1 terminal
block. The terminal block is located inside the unit control
box. Refer to the customer connection diagram that is
shipped with the unit for specific termination points.
Provide proper grounding for the unit in accordance with
the local and national codes.
