System Requirements - Carrier 40MBC/38MAQ Installation Instructions Manual

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.
S Minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m).
S Table 1 lists the maximum lengths.
Min. Piping Length
Standard Piping Length
Max. outdoor--- indoor height difference
(OU higher than IU)
Max. outdoor--- indoor height difference
(IU higher than OU)
Piping Max. Piping length with no additional refrigerant
charge
Max. Piping Length
Additional refrigerant charge
(between standard --- Max piping length)
Gas Pipe (size--- connection type)
Liquid Pipe (size--- connection type)
Refrigerant Type
Refrigerant
Charge Amount
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 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.
Table 1—Piping Lengths
SYSTEM SIZE 9K
ft(m) 10 (3)
ft(m) 25 (7.6)
ft(m) 32 (10)
ft(m) 32(10)
ft(m) 25 (7.6)
ft(m) 82 (25)
Oz/ft(g/m) 0.27 (25)
in(mm) 3/8 (9.52)
in(mm) 1/4 (6.35)
R410A
Lbs(kg) 2.76 (1.25)
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.
S Wires should be sized based on NEC and local codes.
S Use copper conductors only with a 600 volt rating and
double insulated copper wire.
4
12K 18K
10 (3) 10 (3)
25 (7.6) 25 (7.6)
32 (10) 65 (20)
32(10) 65(20)
25 (7.6) 25 (7.6)
82 (25) 98 (30)
0.27 (25) 0.43 (40)
1/2 (12.7) 1/2 (12.7)
1/4 (6.35) 1/4 (6.35)
R410A R410A
2.76 (1.25) 4.19 (1.90)