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506325-01

Issue 1734

Page 1 of 15

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INSTALLATION AND MAINTENANCE INSTRUCTIONS

MHP4 Series

Self-Contained Heat Pump

Manufactured By

Allied Air Enterprises LLC

A Lennox International Inc. Company

215 Metropolitan Drive

West Columbia, SC 29170

This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in 

manuals, be alert to the potential for personal injury or death.

Improper installation, adjustment, alteration, service, or 

maintenance can cause injury or property damage. Refer 

to this manual. For assistance or additional information, 

consult a qualified installer or service agency.

 WARNING

Table of Contents

Installation ...................................................................2

Operation .....................................................................7

Maintenance ................................................................9

Accessories ...............................................................10

Wiring Diagrams ........................................................12

The installation of this appliance must conform to the requirements of the National Fire Protection Association; the National 

Electrical Code, ANSI/NFPA No. 70 (latest edition) in the United States; the Canadian Electrical Code Part 1, CSA 22.1 

(latest edition) in Canada; and any state or provincial laws or local ordinances. Local authorities having jurisdiction should 

be consulted before installation is made. Such applicable regulations or requirements take precedence over the general 

instructions in this manual.

 CAUTION

For your safety, do not store or use gasoline or other 

flammable vapors and liquids in the vicinity of this or any 

other appliance. Such actions could result in property 

damage, personal injury, or death.

 WARNING

Installation and servicing of air conditioning equipment 

can be hazardous due to internal refrigerant pressure 

and live electrical components. Only trained and 

qualified  service  personnel  should  install  or  service 

this equipment. Installation and service performed by 

unqualified  persons  can  result  in  property  damage, 

personal injury, or death.

 WARNING

The unit must be installed with approved wall sleeve 

and grille accessories for safe operation. Improper 

installations could result in property damage, personal 

injury, or death.

 WARNING

 

(P) 506325-01

*P506325-01*

Summary of Contents for MHP-10-24

Page 1: ...est edition in the United States the Canadian Electrical Code Part 1 CSA 22 1 latest edition in Canada and any state or provincial laws or local ordinances Local authorities having jurisdiction should...

Page 2: ...carrier do not install the unit as claim may be denied Check the unit rating plate to confirm specifications are as ordered Table 1 Application Limitations Outdoor Ambient Air Temperature F Minimum D...

Page 3: ...the unit is the preferred method of providing access The door or access panel must be at least 30 wide centered on the unit and as tall as the unit If a return duct is not installed in order to provi...

Page 4: ...nd the louver grille kit along with Figure 2 for guidance in assembling and installing the wall sleeve and louver grille The sleeve is not intended as the sole support for the unit An additional suppo...

Page 5: ...ecommended that supply and return duct connections at the unit be made with flexible joints If flexible ducts are used a 6 sheet metal starter collar is required The supply and return air duct systems...

Page 6: ...inches MHP 18 288 square inches MHP 24 384 square inches MHP 30 36 480 square inches 9 and 10 EER Models Condensate Drain Provisions must be made to properly drain the indoor and outdoor drain pans o...

Page 7: ...e contactor Cooling When the thermostat is in the cooling mode the O circuit is powered which energizes the reversing valve Upon cooling demand the thermostat closes circuit R to Y and G Closing R to...

Page 8: ...oting of the defrost system see Figure 8 The following is a brief outline of the testing of the defrost system 1 Defrost sensor must be closed 32 F or below If temperatures are such that the switch wi...

Page 9: ...air circuit Cleaning should be as often as necessary to keep the coil clean To clean the coil remove the lower access panel and blow out debris by using compressed air or water Be sure power to unit i...

Page 10: ...ASLEEVE 3 Wall Sleeve Kit 45 Louver MHP4 09 12 18 ASLEEVE2 1 2 Wall Sleeve Kit MHP4 09 12 18 24 30MHP4 10 18 24 ASLEEVE2 2 2 Wall Sleeve Kit MHP4 10 30 MHP4 09 36 ASLEEVE6 1 6 Wall Sleeve Kit MHP4 09...

Page 11: ...10 3 10 45 45 1 8 ASLEEVE10 4 10 45 45 1 8 ASLEEVE12 1 12 29 29 1 8 ASLEEVE12 2 12 32 3 4 32 7 8 ASLEEVE12 3 12 45 45 1 8 ASLEEVE12 4 12 45 45 1 8 ASLEEVE 3 45 45 1 8 Thru the wall installations only...

Page 12: ...ITOR RUN CONDENSER FAN COMP CONNECTOR BLOCK BLUE GREY COOLING R G Y O BLACK BLACK X FRmR X FRmC GRAY BROWN C H MH ML FUSE BLUE BLUE COM RVG RV O Y W R DFS2 DFS1 C C DF1 LIGHT BLUE REVERSING VALVE BLAC...

Page 13: ...SEQ C RVG CC O Y W R DFS DFS C TRANSFORMER REVERSING VALVE COIL DF DF DEFROST RELAY FAN MOTOR DUAL CAPACITOR CONTACTOR L1 T1 C R S 208 230V 1 60HZ DEFROST SENSOR DEFROST CONTROL BLOWER CONTROL COM 20...

Page 14: ...LING R G Y O BLACK BLACK X FRmR X FRmC GRAY BROWN C H MH L FUSE BLUE BLUE COM RVG RV O Y W R DFS2 DFS1 C C DF1 LIGHT BLUE REVERSING VALVE BLACK BLACK O O ORANGE WHITE RED BLACK BLACK DEFROST CONTROL B...

Page 15: ...IT SEQ C RVG CC O Y W R DFS DFS C TRANSFORMER REVERSING VALVE COIL DF DF FAN MOTOR DUAL CAPACITOR CONTACTOR L1 T1 C R S 208 230V 1 60HZ DEFROST CONTROL BLOWER CONTROL COM 208 240 24 V G CONTACTOR COIL...

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