4
SYSTEM REQUIREMENTS
Allow sufficient space for airflow and servicing unit. See Fig. 5 for minimum required distances between unit and walls or ceilings.
Piping
IMPORTANT
:
Both refrigerant lines must be insulated separately.
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Minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m).
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Table 1 lists the maximum lengths.
Table 1—Piping Lengths
SYSTEM SIZE
9K
12K
18K
Piping
Min. Piping Length
ft(m)
10 (3)
10 (3)
10 (3)
Standard Piping Length
ft(m)
25 (7.6)
25 (7.6)
25 (7.6)
Max. outdoor---indoor height difference
(OU higher than IU)
ft(m)
32 (10)
32 (10)
65 (20)
Max. outdoor---indoor height difference
(IU higher than OU)
ft(m)
32(10)
32(10)
65(20)
Max. Piping length with no additional refrigerant
charge
ft(m)
25 (7.6)
25 (7.6)
25 (7.6)
Max. Piping Length
ft(m)
82 (25)
82 (25)
98 (30)
Additional refrigerant charge
(between standard---Max piping length)
Oz/ft(g/m)
0.27 (25)
0.27 (25)
0.43 (40)
Gas Pipe (size---connection type)
in(mm)
3/8 (9.52)
1/2 (12.7)
1/2 (12.7)
Liquid Pipe (size---connection type)
in(mm)
1/4 (6.35)
1/4 (6.35)
1/4 (6.35)
Refrigerant Refrigerant Type
R410A
R410A
R410A
Charge Amount
Lbs(kg)
2.76 (1.25)
2.76 (1.25)
4.19 (1.90)
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Above charge is for piping runs up to 25 ft. (7.6 m).
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For piping runs greater than 25 ft. (7.6 m), add refrigerant up to the allowable length as specified in Table 1.
The outdoor unit has an electronic expansion valve to manage the refrigerant flow of the fan coil connected.
All wires must be sized per NEC (National Electrical Code) or
CEC (Canadian Electrical Code) and local codes. Use the
Electrical Data table MCA (minimum circuit amps) and MOCP
(maximum over current protection) to correctly size the wires and
the disconnect fuse or breakers respectively.
Per the caution note, only stranded copper conductors with a 600
volt rating and double insulated copper wire must be used. The
use of BX cable is not recommended.
IMPORTANT
: The use of BX cable is not recommended.
Recommended Connection Method for Power and
Communication Wiring -- Power and Communication Wiring:
The main power is supplied to the outdoor unit. The field
supplied 14/3 power/communication wiring from the outdoor unit
to indoor unit consists of four (4) wires and provides the power
for the indoor unit. Two wires are high voltage AC power. One
wire is communication wiring and the other is a ground wire.
Recommended Connection Method for Power and
Communication Wiring (To minimize communication wiring
interference)
Power Wiring:
The main power is supplied to the outdoor unit. The field
supplied connecting cable from the outdoor unit to the indoor unit
consists of three (3) wires and provides the power for the indoor
unit. Two wires are high voltage AC power and one is a ground
wire.
Communication Wiring:
A separate shielded stranded copper conductor only, with a 600
volt rating and double insulated copper wire, must be used as the
communication wire from the outdoor unit to the indoor unit.
Please use a separate shielded 16GA stranded control wire.
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
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Wires should be sized based on NEC and local codes.
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Use copper conductors only with a 600 volt rating and
double insulated copper wire.
