Installation
9
R e s i d e n t i a l S p l i t U n i t s - 6 0 H z P u r o n
®
R e v. : 6 D e c . , 2 0 1 1
The installation of water source heat pump units and all
associated components, parts and accessories which make
up the installation shall be in accordance with the regulations
of ALL authorities having jurisdiction and MUST conform to
all applicable codes. It is the responsibility of the installing
contractor to determine and comply with ALL applicable
codes and regulations.
Removing Existing Condensing Unit (Where Applicable)
1. Pump down condensing unit. Close the liquid line
service valve of existing condensing unit and start
compressor to pump refrigerant back into compressor
section. Then, close suction service valve while
compressor is still running to trap refrigerant in outdoor
section. Immediately kill power to the condensing unit.
2. Disconnect power and low voltage and remove old
condensing unit. Cut or unbraze line set from unit.
Remove condensing unit.
3. If condensing unit is not operational or will not pump
down, refrigerant should be recovered using appropriate
equipment.
4. Replace line set, especially if upgrading system from
R-22 to Puron
®
refrigerant. If line set cannot be replaced,
it must be thoroughly
Å
ushed before installing new
compressor section. Puron
®
compressors use POE
oil instead of mineral oil (R-22 systems). Mineral oil is
not compatible with POE oil, and could cause system
damage if not completely
Å
ushed from the line set.
“Indoor” Compressor Section Location
Both “indoor” and “outdoor” versions of the geothermal
split system compressor section are available. “Indoor”
version is not designed for outdoor installation. Locate the
unit in an INDOOR area that allows enough space for service
personnel to perform typical maintenance or repairs without
removing unit. Units are typically installed in a mechanical
room or closet. Never install units in areas subject to freezing
or where humidity levels could cause cabinet condensation
(such as unconditioned spaces subject to 100% outside air).
Consideration should be given to access for easy removal
of service access panels. Provide suf
Ä
cient room to make
water, electrical, and line set connections.
Any access panel screws that would be dif
Ä
cult to remove
after the unit is installed should be removed prior to setting
the unit. Refer to Figure 2 for an illustration of a typical
installation. Refer to “Physical Dimensions” section for
dimensional data. Conform to the following guidelines when
selecting unit location:
1. Install the unit on a piece of rubber, neoprene or other
mounting pad material for sound isolation. The pad should
be at least 3/8” [10mm] to 1/2” [13mm] in thickness.
Extend the pad beyond all four edges of the unit.
2. Provide adequate clearance for maintenance and
service. Do not block access panels with piping, conduit
or other materials.
3. Provide access for servicing the compressor and coils
without removing the unit.
4. Provide an unobstructed path to the unit within the
closet or mechanical room. Space should be suf
Ä
cient to
allow removal of the unit, if necessary.
5. Provide access to water valves and
Ä
ttings and
screwdriver access to the unit side panels and all
electrical connections.
“Outdoor” Compressor Section Location
Locate the unit in an outdoor area that allows easy loop
and lineset access and also has enough space for service
personnel to perform typical maintenance or repairs. The
“outdoor” compressor section is usually installed on a
condenser pad directly outside the lineset access into the
building. The loop access end should be located away from
the building. Conform to the following guidelines when
selecting unit location:
1. Provide adequate access for loop trench excavation.
2. Locate unit directly outside lineset penetration if
possible. Utilize existing condensor pad where
possible.
3. Provide access for servicing and maintenance.
“Outdoor” compressor section may be mounted on a
vibration isolation pad with loop access hole as shown
in Figure 3. When mounting on an existing concrete
condenser pad, 3” [76 mm] holes should be bored through
the pad to accommodate the pipe (1-
¼
” - 32mm) and
insulation (
½
” [13mm] wall thickness). Figure 3 illustrates
location and dimensions of the holes required.
Air Handler Installation
This manual speci
Ä
cally addresses the compressor section
of the system. Air handler location and installation should
be according to the instructions provided with the air
handling unit.