Rooftop Installation & Recommendations; Indoor Coil Piston Selection; Refrigeration Line Sets - Allied Air 2HP13 Installation Manual

Elevate Unit
Accumulation of water and ice in base pan may
cause equipment damage.
Elevate unit per local climate and code requirements to
provide clearance above estimated snowfall level and
ensure adequate drainage of unit. Use snow stand in
areas where prolonged freezing temperatures are
encountered.
If conditions or local codes require the unit be attached
to pad or mounting frame, tie down bolts should be used
and fastened through knockouts provided in unit base pan.
Roof Top Installations
Mount on level platform or frame 6 inches above roof
surface. Place unit above a load-bearing wall and isolate
unit and tubing set from structure. Arrange supporting
members to adequately support unit and minimize
transmission of vibration to building. Ensure roof structure
and anchoring method is adequate for location. Consult
local codes governing rooftop applications.
Roof mounted units exposed to winds above 5 mph
may require wind baffles to achieve adequate defrost. A
sheet metal baffle should be spaced 6-1/2" from the fall of
the coil. The height should cover the face of the coil and
the length should be 6" from the access panel.
NOTE: Unit must be level to within ± 2 / (± 3/8 in./ft) per
compressor manufacturer specifications.
Clearance Requirements
When installing, allow sufficient space for airflow
clearance, wiring, refrigerant piping, and service.
proper airflow, quiet operation and maximum efficiency.
Position so water, snow, or ice from roof or eaves cannot
fall directly on unit.
100402-07
DO LOCATE THE UNIT:
!
With proper clearances on sides and top of unit
!
On a solid, level foundation or pad
!
To minimize refrigerant line lengths
DO NOT LOCATE THE UNIT:
!
On brick, concrete blocks or unstable surfaces
!
Near clothes dryer exhaust vents
!
Near sleeping area or near windows
!
Under eaves where water, snow or ice can fall
directly on the unit
!
with clearance less than 2 ft. from a second unit
!
with clearance less than 4 ft. on top of unit
Operating Ambient
The minimum outdoor operating ambient in cooling
mode is 55 / F, and the maximum outdoor operating ambient
in cooling mode is 125 / F. The maximum outdoor operating
ambient in heating mode is 66 / F.

Indoor Coil Piston Selection

The outdoor heat pump section must be matched to a
factory approved indoor section. It is mandatory that the
installer ensure that the correct piston is installed in the
indoor section. If necessary remove the existing piston and
replace it with the correct piston
instructions for details of changing the piston.
your distributor for accessory piston kits.
13 SEER Heat Pump Indoor Piston Sizes
Unit Size
18
24
30
36
42
For 48
60
The evaporator coil may use an expansion valve (TXV) in place of piston.
14 SEER Heat Pump Models
All 14 SEER heat pump models are only rated with TXV on
the indoor side.
14 SEER Heat Pump Indoor TXV
Unit Size
18 thru 36
42 thru 48

Refrigeration Line Sets

Use only refrigerant grade copper tubes.
systems may be installed with up to 50 feet of line set (no
more than 20 feet vertical) without special consideration
(see long line set guidelines).
Issue 0733
Indoor (Cooling) Piston Size
Piston Size
See indoor unit
Contact
.055
.063
.068
.076
.076
.082
.098
TXV Kit
TXV3
TXV5
Split
Page 3 of 18