Armstrong Air Conditioning 4HP13, Installation & Start-Up Instructions

Page: 3 / 17

Page 3 of 17 506318-01 Issue 0946
Elevate Unit
CAUTION
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. For proper
airflow, quiet operation and maximum efficiency. Position
so water, snow, or ice from roof or eaves cannot fall directly
on unit.
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.
Refrigeration Line Sets
Use only refrigerant grade copper tubes. Split 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).
It is important that no tubing be cut or seals broken until
you are ready to actually make connections to the evaporator
and to the condenser section. DO NOT remove rubber plugs
or copper caps from the tube ends until ready to make
connections at evaporator and condenser. Under no
circumstances leave the lines open to the atmosphere for
any period of time, if so unit requires additional evacuation
to remove moisture.
Be extra careful with sharp bends. Tubing can “kink”
very easily, and if this occurs, the entire tube length will
have to be replaced.
Extra care at this time will eliminate
future service problems.
It is recommended that vertical suction risers not be
up-sized. Proper oil return to the compressor should be
maintained with suction gas velocity.
Recommended Liquid & Vapor Tube Diameters (In.)
Unit
Size
LIQUID VAPOR
Connections Dia. Connections Dia. Tube Dia.
Tube Dia.
018
024
030
036
042
048
060
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/8”
3/4”
3/4”
3/4”
3/4”
3/4”
3/4”
*1-1/8
7/8”
7/8”
7/8”
7/8”
7/8”
7/8”
7/8”
* FIELD SUPPLIED 7/8 X 1-1/8 CONNECTOR REQUIRED ON BOTH ENDS OF VAPOR TUBING.