MRCOOL PRODIRECT Heat Kit Install Manual

Brand: MRCOOL

Model: PRODIRECT Heat Kit

Type: Install Manual

Please read this manual carefully before installation and keep it for future reference.

Owner & Installation

Manual

PRODIRECT

Electric Heat Kit

Model: PHK**H

Thank you for choosing MRCOOL. Please read this manual carefully before installation and keep it for future reference.

Due to updates and constantly improving performance, the information and instructions within this

manual are subject to change without notice. Please visit www.mrcool.com/documentation to

ensure you have the latest version of this manual.

Version Date: 6-22-22

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mrcool.com

Table Of Contents

Preperation Before Install ............................................................. 1

Install Electrical Heating Components ......................................... 2

Wiring Diagrams .............................................................................. 5

CAUTION

1. Ensure that all power supplies are disconnected prior to installing the heat kit.

2. Check heat kit for physical damage. Do not install a damaged heat kit.

3. A means of strain relief and conductor protection must be provided at the supply wire

entrance into cabinet.

4. Only use copper conductors.

5. Installation must follow National Electric Code (NEC) and other applicable codes.

IMPORTANT

You must use a compatible heat kit listed in the chart above. Using an

incorrectly sized heat kit could cause the unit to overheat and/or cause

equipment damage.

Compatible Heat Kits

PHK05H

PHK07H

5kW heat strip

7.5kW heat strip

PHK10H 10kW heat strip

Kit #. Description

18K/24K/30K/36K/42K/48K/60K

24K/30K/36K/42K/48K/60K

Unit Capacity Compatibility

PHK15H 15kW heat strip

PHK20H 20kW heat strip

36K/42K/48K/60K

48K/60K

MRCOOL® Electric Heat Kit

Page 1mrcool.com

Safety Precautions 1

Preparation Before Installation

1.) Remove the upper side panel of the air handler.

2.) Remove the air duct sealing plate by removing the 4 retaining screws.

3.) Knock out the covered hole on the front panel.

Remove the

4 screws

Page 2 mrcool.com

Install Electric Heating Components

1.) Insert the electric heat kit into the air duct installation hole and

align the 4 prongs on the end of the heat kit with the corresponding 4 holes

on the opposite side of the air duct hole.

2.) Reinstall screws to fasten the heat kit element to the air duct.

3.) Fasten heat kit electrical board bracket to air handler by installing 2 screws.

4 prongs

Reinstall

screws

Position

bracket and

install screws

Installing Electric Heating Components

Page 3mrcool.com

4.) Position the heat kit electrical board on the bracket and fasten with 4 screws.

NOTE: When installing the electrical installation board, pay attention to the

indoor unit power cord and make sure it does not hang or snag on the sharp

edges of the sheet metal heat kit bracket. Please refer to the image below.

Fasten electrical

board to bracket

with 4 screws

Installing Electric Heating Components

Page 4 mrcool.com

5.) Insert electric heat kit connector into the correct terminal on the air handler

main board.

6.) Reinstall the upper side panel. The switches for the heat kit should protrude

through the hole you knocked out of the panel. Then, turn on the power and

check operation.

Electric Heat Kit wiring

connector inserted into

correct terminal on air

handler main board

Page 1 mrcool.com

Wiring Diagrams

Page 5mrcool.com

Wiring Diagrams for each model with Heat Kit Installed

1.) 53 Model (18K/24K/30K/36K/42K)

2.) 140 Model (48K)

～24V

COM

208V

240V

RESISTOR

5kΩ

802036000348

CN7

C W1W2

HS-4

HS-3

HS-2

HS-1

Electric

heating

control

LS1-1

HS-1

HEAT 1

LS2-1

RD BK BK

HS-1

LS1-2

HS-2

HEAT2

LS2-2

RD BK BK

HS-2

LS1-3

HS-3

LS2-3

RD BK BK

HS-3

LS1-4

HS-4

LS2-4

RD BK BK

HS-4

HEAT3

HEAT4

Electric

heating

power

CB1

CB2

One-stage electric heating 5-10KW, using One CB, signal line W1，C

Two-stage electric heating 11-20KW, using CB1、CB2, signal line W1, W2,C

For the optional electric heat kit:

due to the difference of electric heating power purchased by customers,

the specific wiring shall be subject to the actual situation

Note 1: Please make ﬁeld

wiring according to actual

installation requirements.

Note 1: Please make ﬁeld

wiring according to actual

installation requirements.

～24V

COM

208V

240V

RESISTOR

5kΩ

802036000349

CN7

C W1W2

HS-4

HS-3

HS-2

HS-1

Electric

heating

control

LS1-1

HS-1

HEAT 1

LS2-1

RD BK BK

HS-1

LS1-2

HS-2

HEAT2

LS2-2

RD BK BK

HS-2

LS1-3

HS-3

LS2-3

RD BK BK

HS-3

LS1-4

HS-4

LS2-4

RD BK BK

HS-4

HEAT3

HEAT4

Electric

heating

power

CB1

CB2

One-stage electric heating 5-10KW, using One CB, signal line W1，C

Two-stage electric heating 11-20KW, using CB1、CB2, signal line W1, W2,C

For the optional electric heat kit:

due to the difference of electric heating power purchased by customers,

the specific wiring shall be subject to the actual situation

Wiring Diagrams

Page 6 mrcool.com

3.) 160 Model (60K)

Schematic diagrams of electric heating components

1.) 5-10KW Heat Kit

～24V

COM

208V

240V

RESISTOR

5kΩ

802036000350

CN7

C W1W2

HS-4

HS-3

HS-2

HS-1

Electric

heating

control

LS1-1

HS-1

HEAT 1

LS2-1

RD BK BK

HS-1

LS1-2

HS-2

HEAT2

LS2-2

RD BK BK

HS-2

LS1-3

HS-3

LS2-3

RD BK BK

HS-3

LS1-4

HS-4

LS2-4

RD BK BK

HS-4

HEAT3

HEAT4

Electric

heating

power

CB1

CB2

One-stage electric heating 5-10KW, using One CB, signal line W1，C

Two-stage electric heating 11-20KW, using CB1、CB2, signal line W1, W2,C

For the optional electric heat kit:

due to the difference of electric heating power purchased by customers,

the specific wiring shall be subject to the actual situation

2.) 11-20KW Heat Kit

Note: The order of coils has been updated from previous electric heat kit.

Wiring Diagrams

Page 7mrcool.com

PRODIRECT

Electric Heat Kit

MRCOOL PRODIRECT Heat Kit Install Manual

MRCOOL PRODIRECT Heat Kit Install Manual

MRCOOL PRODIRECT Heat Kit Install Manual

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