Installation Instructions

3
SAFETY CONSIDERATIONS
Installing, starting up, and servicing air−conditioning equipment
can be hazardous due to system pressures, electrical components,
and equipment location (roofs, elevated structures, etc.).
Only trained, qualified installers and service mechanics should
install, start−up, and service this equipment.
Untrained personnel can perform basic maintenance functions such
as cleaning coils. All other operations should be performed by
trained service personnel.
When working on the equipment, observe precautions in the
literature and on tags, stickers, and labels attached to the
equipment.
Follow all safety codes. Wear safety glasses and work gloves. Keep
a quenching cloth and fire extinguisher nearby when brazing. Use
care in handling, rigging, and setting bulky equipment.
Read these instructions thoroughly and follow all warnings or
cautions included in literature and attached to the unit. Consult
local building codes and National Electrical Code (NEC) for
special requirements. Recognize safety information. This is the
safety−alert symbol
!
!
. When you see this symbol on the unit and
in instructions or manuals, be alert to the potential for personal
injury. Understand these signal words: DANGER, WARNING,
and CAUTION. These words are used with the safety−alert
symbol. DANGER identifies the most serious hazards which will
result in severe personal injury or death. WARNING signifies
hazards which could result in personal injury or death. CAUTION
is used to identify unsafe practices which may result in minor
personal injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced installation,
reliability, or operation.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF
position. There may be more than 1 disconnect switch.
Lock out and tag switch with a suitable warning label.
EXPLOSION HAZARD
Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.
Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors. Pressurized
mixtures of air or gases containing
oxygen can lead to an explosion.
!
WARNING
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Do not bury more than 36 in. (914 mm) of refrigerant pipe
in the ground. If any section of pipe is buried, there must be
a 6 in. (152 mm) vertical rise to the valve connections on
the outdoor units. If more than the recommended length is
buried, refrigerant may migrate to the cooler buried section
during extended periods of system shutdown. This causes
refrigerant slugging and could possibly damage the
compressor at start−up.
SYSTEM REQUIREMENTS
Allow sufficient space for airflow and servicing unit. See Fig. 3
and 4 for minimum required distances between unit and walls or
ceilings.
Piping
IMPORTANT: Both refrigerant lines must be insulated
separately.
S Minimum refrigerant line length between the indoor and outdoor
units is 10 ft. (3 m).
S The following maximum lengths are allowed:
Table 1 – Refrigerant Line Lengths
Unit Size Max Line Length
Max Elevation
(ID over OD)
Max Elevation
(OD over ID)
9K 82 (25) 32 (10) 32 (10)
12K 82 (25) 32 (10) 32 (10)
17K HP 98 (30) 65 (20) 65 (20)
18K AC 98 (30) 65 (20) 65 (20)
22K 131 (40) 65 (20) 65 (20)
S The following are the piping sizes.
Table 2 – Pipe Sizes (in)
Unit Size Mix Phase Vapor
9K 1/4 3/8
12K 1/4 1/2
17K HP 1/4 1/2
18K AC 1/4 1/2
22K 3/8 5/8
Refrigerant Charge
Table 3 – Refrigerant Charge lb. (kg)
Unit Size Air Conditioner (AC)
Heat Pump (HP)
9K 1.34 (0.61) 2.70 (1.18)
12K 1.43 (0.65) 2.70 (1.18)
17K HP NA 2.87 (1.30)
18K AC 1.87 (0.85) NA
22K 2.60 (1.18) 3.52 (1.60)
S Above charge is for piping runs up to 25 ft. (7.6 m).
S For piping runs greater than 25 ft. (7.6 m), add refrigerant up:
Table 4 – Additional Refrigerant Charge
Unit Size oz./ft. (g/m)
9K - 18K 0.16 (15)
22K 0.32 (30)
S Capillary tubes in outdoor unit are used as metering devices.