14
Control Wiring
Thermostat wires should be used for control wiring between the
indoor and outdoor units. A two conductor cable is required for the
cooling only units and a four conductor cable is required for heat
pumps.
The control circuit is 24 volts AC (minimum 40VA) supplied from
the indoor unit.
1. Make sure you have enough control wires to cover the
distance between the indoor and outdoor unit.
2. Route one end of the control wiring through the opening
provided in the unit side panel and connect to the control
terminal strip using either Fig. 28 for AC units or Fig. 29
for Heat Pump units.
A150280
Fig. 28 – 40MKCB**F/24AHA4 or 124ANS Connecting
Diagram
A150282
Fig. 29 – 40MKQB**F/25HHA4 or 224ANS Connecting
Diagram
Strain Relief Bracket for Indoor Units
A strain relief is included within the indoor unit’s packaging. This
is required to be installed. The strain relief bracket and location to
where this should be affixed on the unit’s body is shown in Fig. 30
and 31.
Note: dimensions are in millimeters (mm)
A150308
Fig. 30 – Strain Relief Bracket
Strain Relief Bracket Location
A150307
Fig. 31 – Strain Relief Bracket Affixed to Under Ceiling Body
