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Page 27
mrcool.com
Unit Installation
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 MHK15U or MHK20U, connect two separate lines of power from the
Circuit Breaker Panel to L1 and L2 of the two circuit breakers 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 Max Amperage
MDUI 48K/60K+ MHK15U
60/30 Amps
60/60 Amps
MDUI 48K/60K + MHK20U
Wiring Diagram of MDUOC18048E/MDUI18060E (4-5 Ton with Electric Heat Kit)
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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