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Page 26
mrcool.com
Unit Installation
Wiring Diagram of MDUOC18024E/MDUI18036E (2-3 Ton with Electric Heat Kit)
NOTE: For wiring diagram of 4-5 ton units with
electric heater please refer to the next page.
Optional: Heat Kit Installation Instructions
1. Remove the upper access panel from the air handler.
2. Remove the cover plate inside the upper access panel of the air handler.
3. Slide the heat kit into the slot and secure element plate with previously removed screws.
4. Make sure to insert the supporting poles of the heat kit into the supporting hole of the air handler.
5. Connect the quick connection plug and fasten the loose wires by using wire ties.
6. Install the circuit breaker into the mounting rail, break out appropriate area of the plastic circuit
breaker cover on the access panel of the air handler.
7. a. When installing MHK05U, MHK08U, or MHK10U, connect the power from the Circuit Breaker
Panel to L1 and L2 of the circuit breaker included with the electric heat kit.
b. When connecting the electric heat kit to the air handler, use the Molex Plug Wiring Harness
from the electric heat kit and attach it to the Molex Plug Wiring Harness coming from air
handler’s PCB board.
c. The Molex Plug Connection will power the air handler, so you will not need a separate source of
incoming power for the air handler itself.
d. Please see the chart below for proper sizing of panel.
Circuit Breaker Size in Panel for Air Handler + Heat Kit
Combination
MDUI 24K/36K + MHK05U
MDUI 24K/36K + MHK08U
MDUI 24K/36K + MHK10U
60 Amps
45 Amps
30 Amps
Max Amperage
NOTE: A Heat Kit
Installation is NOT
required for the unit to
function properly. It is
intended for Emergency
Heat Purposes ONLY.
Electrical Connection
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