International comfort products NH4H4 Installation Instructions Manual
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International comfort products NH4H4 Installation Instructions Manual

R−410a horizontal split system heat pumps
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INSTALLATION INSTRUCTIONS
R−410A Horizontal Split System Heat Pumps
These instructions must be read and understood completely before attempting installation.
Fig. 1 - NH4H4
NOTE: Read the entire instruction manual before starting the
installation.

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MAINTENANCE
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NH4H4
A07532
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2−4
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7−9

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory−authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes and
the current editions of the National Electrical Code (NEC)
NFPA70.
In Canada, refer to the current editions of the Canadian Electrical
Code CSA C22.1.
Recognize safety information. This is the safety−alert symbol
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury. Understand
the signal words DANGER, WARNING, and CAUTION. These
words are used with the safety−alert symbol. DANGER identifies
the most serious hazards which will result in severe personal injury
or death. WARNING signifies hazards which could result in
personal injury or death. CAUTION is used to identify unsafe
practices which may result in minor personal injury or product and
1
property damage. NOTE is used to highlight suggestions which
will result in enhanced installation, reliability, or operation.
2
!
2
3
ELECTRICAL SHOCK HAZARD
4
4
5
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
pollution.
Remove and recycle all components or materials (i.e. oil,
refrigerant, etc.) before unit final disposal.
WARNING
428 01 9702 01
.
02/25/15

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  • Page 1: Table Of Contents

    Code CSA C22.1. Recognize safety information. This is the safety−alert symbol A07532 Fig. 1 - NH4H4 When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING, and CAUTION. These NOTE: Read the entire instruction manual before starting the words are used with the safety−alert symbol.

  • Page 2: Installation

    Arrange units so discharge of one does not enter inlet of another. Allow 24” The NH4H4 heat pump units can be matched to corresponding (609.6 mm) minimum clearance on compressor end when units are indoor units.

  • Page 3: Complete Refrigerant Piping Connections

    Operating Ambient Long Line Application Guide for required accessories. If either refrigerant tubing or indoor coil is exposed to the atmosphere, the Minimum outdoor operating ambient in cooling mode is 55_F system must be evacuated following good refrigeration practices. (13_C), maximum 125_F (52_C). Run refrigerant tubes as directly as possible, avoiding unnecessary Rigging turns and bends.

  • Page 4: Make Electrical Connections

    Failure to follow this warning could result in personal injury or refrigerant piping connections. death. NOTE: The NH4H4 units use the control transformer supplied Before performing service or maintenance, be sure indoor unit with the matched indoor unit. main power switch is turned OFF and indoor blower has START−UP...

  • Page 5: Service

    SERVICE WARNING WARNING PERSONAL INJURY HAZARD ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Failure to follow this warning could result in personal injury or death. attempt simulate these system abnormalities − high pressures pose a serious safety Before installing, modifying, or servicing system, main hazard.
  • Page 6 The defrost timer limits defrosting period to 10 minutes. Normally, Refrigerant Charging the frost is removed and the defrost thermostat contacts open to WARNING terminate defrosting before 10 minutes have elapsed. When defrosting is terminated, the outdoor−fan motor is energized, and reversing valve solenoid is de−energized, returning unit to heating PERSONAL INJURY...
  • Page 7 Heating Check Chart Procedure − Heating Mode 4. Measure outdoor dry−bulb temperature with thermometer. To check system operation during heating cycle, refer to the 5. Measure indoor air (entering indoor coil) wet−bulb Heating Check Chart on outdoor unit. This chart indicates whether temperature with a sling psychrometer.
  • Page 8 Table 1—Horizontal Discharge Outdoor Units − Adjusted Subcooling Subcooling Delta from Rating Plate Value Indoor Unit Outdoor Unit Tonnage EA*4X18*14A* –– EN(A,D)4X18*14A** –– FEM4X18**B* –– FMA4X18**A* –– FM(C,U)4X18**A* –– FXM4X18**A* –– EA*4X24***A* –– –– EN(A,D)4X24***A** –– –– EHD4X24A** –– FEM4X24**B* ––...
  • Page 9 Table 2—Superheat Charging OUT- EVAPORATOR ENTERING AIR TEMPERATURE °F (°C) WB DOOR TEMP °F (10) (11) (12) (13) (14) (16) (17) (18) (19) (20) (21) (22) (23) (24) (°C) (13) (-13) (-11) (-10) (-8) (-7) (-5) (-3) (-2) (16) (-14) (-12) (-11) (-9)
  • Page 10 Specifications subject to change without notice. 428 01 9702 01 Copyright 2015 International Comfort Products Lewisburg, TN 37091 USA...

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