BEFORE PERFORMING ELECTRICAL
WORK, READ THESE REGULATIONS
DO NOT connect another appliance to
outlet dedicated to the unit. The unit
should be connected to an individual
branch circuit outlet.
DO NOT allow the wires to touch or rest
against the refrigerant piping, the
compressor, or any moving parts within
the unit.
1. All wiring must be installed by a licensed
electrician and comply with local and
national electrical codes.
2. All electrical connections must be made
according to the Electrical Connection
Diagram located on the panels of the
indoor and outdoor units.
3. If there is a serious safety issue with the
power supply, stop work immediately.
Explain your reasoning to the client, and
refuse to install the unit until the safety
issue is properly resolved.
4. Power voltage should be within 90-110% of
the rated voltage. An insufficient power
supply can cause a malfunction, electrical
shock, and/or fire.
5. If connecting to fixed wiring, a surge
protector and main power switch should
be installed. The qualified technician must
install and incorporate an approved circuit
breaker or switch that disconnects all
poles, and has a contact separation of at
least 1/8 in (3 mm), into the fixed wiring.
6. Circuits, including any switches, should
have 1.5 times the maximum unit current
(amps).
7. Ensure the unit is properly grounded.
8. Ensure every wire is firmly connected.
Loose wiring can cause the terminal to
overheat which could result in a
malfunction and/or fire.
9. If the unit is equipped with an auxiliary
heater, it must be installed at least 40 in
(1 m) away from combustible materials.
10. To avoid electrical shock, never touch the
electrical components directly after the
power supply has been turned off. Once
the power has been turned off, always
wait at least 10 minutes before touching
any electrical components.
Page 37 mrcool.com
Outdoor Unit Installation
Step 5: Connect Power and Signal Cables to
the Outdoor Unit
In this step, the power supply and the signal cable
from the indoor unit will be connected to the outdoor
unit. The terminal block of the outdoor condenser is
protected by an electrical wiring cover located on
the side of the unit. A comprehensive wiring diagram
is printed on the back side of the wiring cover.
BEFORE PERFORMING ANY ELECTRICAL WORK,
ENSURE THE MAIN POWER TO THE SYSTEM IS
TURNED OFF.
WARNING
SELECT THE RIGHT CABLE SIZE:
The size of the power supply cable, signal
cable, fuse, and switch needed is determined
by the maximum current rating of the unit.
This rating is indicated on the nameplate,
located on the side panel of the unit. Refer to
this nameplate to select the proper cable,
fuse, and/or switch. In North America, please
choose the right cable size according to the
Minimum Circuit Ampacity (MCA) indicated
on the nameplate of the unit and also in the
table below.
North America
Appliance
Amps (A)
Hyper-Heat
Condensers
Multi-Zone
Condensers
AWG
15
15
30
18K
12K
9K
Model
Capacity
(BTU/hr)
Minimum Wire Gauge for Power Cables
MCA MOP Min. Pref.
14
14
12
12
12
10
13
13
19
3024K 10 822
159K 14 1215
15
25
3524K
18K
12K 14
12
10
12
10
8
15
16
25
2518K (2-Zone) 12 1018
3027K (3-Zone) 10 824.5
4036K (4-Zone) 8 625
6048K (5-Zone) 8 640
E-Star
Condensers
1. Prepare the cable for connection.
a. Using wire strippers, strip the rubber jacket
from both ends of the signal cable to reveal
roughly 1.57 in (40 mm) of the wires inside.
b. Strip the insulation from the ends of the wires.
c. Using a wire crimper, crimp u-type lugs on the
ends of the wires.
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