Nortek PPH3RF Series, Руководство по установке

Страница: 5 / 20

5
HEAT PUMP INSTALLATION
Unpacking the Unit
It is recommended that the unit be unpacked at the
installation site to minimize damage due to handling.
CAUTION:
Do not tip the unit on its side. Oil may enter the
compressor cylinders and cause starting trouble.
If unit has been set on its side, restore to upright
position and do not run for several hours. Then
run unit for a few seconds. Do this three or four
times with five minutes between runs.
1. Remove the bands from around the unit.
2. Unfold the top and bottom cap flanges.
3. Carefully remove the top cap and tube.
Installing Return & Supply Air Collars
If the supply and return collars are supplied with the unit,
they will be located in the supply duct. They can be easily
positioned over the unit openings and secured with sheet
metal screws. See Figure 3 (page 6) .
• The diameter of the return duct collar is 14”.
NOTE:
2 ton units are designed with 12” returns.
• The diameter of the supply duct collar is 12”.
• Before permanently installing the collars, it is
recommended you pre-fit them over the openings first
to determine best fit and alignment.
Return Duct
1. Assemble the collar by overlapping the two ends.
NOTE: One end of the collar is slotted and the opposite
end has two small holes. Position the end with small
screw holes underneath the slotted end.
2. Fasten the collar ends with two self drilling sheet metal
screws.
3. Position the collar over the opening. Align the four holes
in the collar with the four dimples or holes (depending
on unit model) in the panel.
4. Secure the collar to the rear panel using self tapping
screws (10-16x.5).
Air Duct System
Air ducts should be installed in accordance with the
standards of the National Fire Protection Association
“Standard for Installation of Air Conditioning and Ventilation
Systems” (NFPA 90A), “Standard for Installation of
Residence Type Warm Air Heating and Air Conditioning
Systems” (NFPA 90B), these instructions, and all applicable
codes. NFPA publications are available by writing to:
National Fire Protection Association, Batterymarch Park,
Quincy, ME 02269 or visit www.NFPA.org on the web.
• Design the duct work according to methods described
by the Air Conditioning Contractors of America (ACCA).
• The supply duct system, including the number and
type of registers, will have much more effect on the
performance of the system than any other factor. The
duct must be sufficiently large to conduct an adequate
amount of air to each register. See Figure 2 .
• Duct work should be attached directly to the unit flanges
for horizontal applications.
• For highly resistive duct systems it may be necessary
to add an additional return air duct and or supply to
achieve maximum performance and prevent coil icing
and refrigerant flood back.
• The heat pump system will not cool or heat the home
if air is lost to the outside through leaks in the duct
system. Ducts that are collapsed or restricted by
foreign objects will also prevent adequate air flow.
• All duct work passing through unconditioned space
must be properly insulated to minimize duct losses
and prevent condensation. Use insulation with an outer
vapor barrier. Refer to local codes for insulation material
requirements.
Unconditioned Spaces
All duct work passing through unconditioned space must
be properly insulated to minimize duct losses and prevent
condensation. Use insulation with an outer vapor barrier.
Refer to local codes for insulation material requirements.
The heat pump system will not cool or heat the home
if air is lost to the outside through leaks in the duct
system. Ducts that are collapsed or restricted by
foreign objects will also prevent adequate air flow.
Figure 2. Typical Duct Applications
MULTIPLE DUCT APPLICATION SINGLE DUCT APPLICATION