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Space Pak LAHP48 - User Manual

Space Pak LAHP48
28 pages
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LAHP2-1018
45W30-WG0773
IN UNITED STATES: 260 NORTH ELM ST. WESTFIELD, MA 01085 800-465-8558 / FAX (413) 564-5815
IN CANADA: 7555 TRANMERE DRIVE, MISSISSAUGA, ONTARIO, L5S 1L4 (905) 670-5888 / FAX (905) 670-5782
SECTION 1: READ BEFORE PROCEEDING
Model LAHP Overview ....................................................................... 2
SECTION 2: LAHP FIELD ADJUSTABLE PARAMETERS ... 3-7
SECTION 3: SPECIFICATIONS AND RATINGS ...................... 8-10
SECTION 4: DIMENSIONS ............................................................ 11
SECTION 5: LOCATION & MOUNTING
Prepare the Unit .................................................................................. 12
Location ............................................................................................... 12
Hoisting ................................................................................................ 12
Mounting Pad ...................................................................................... 12
Indoor Installation ................................................................................ 13
SECTION 6: RECOMMENDED PIPING .................................... 13
SECTION 7: GLYCOL/WATER SYSTEM
Glycol/Water System Design/ Installation .......................................... 14-15
SECTION 8: START-UP AND TEST
Preparing for Start-Up ......................................................................... 15
BEFORE Starting the Unit .................................................................. 16
Start the SpacePak Low Ambient Heat Pump .................................. 16
Anti-freeze Cycle ................................................................................. 16
24-Hour follow-up ................................................................................ 16
SECTION 9: ELECTRICAL DIAGRAMS
Pictorial Diagram ................................................................................. 17
Ladder Diagram .................................................................................. 18
Field Connections ............................................................................... 19-20
SECTION 10: TROUBLESHOOTING/FAULT CODES........... 21-22
SECTION 11: MAINTENANCE
Annual Inspection ............................................................................... 23
Preparing the LAHP for Shut Down ................................................... 23
To Restart After Shutdown .................................................................. 23
SECTION 12: REPLACEMENT PARTS ..................................... 24
SECTION 13: LIMITED WARRANTY .......................................... 25
MODEL LAHP48
INSTALLATION,
OPERATION
& MAINTENANCE
MANUAL
Low Ambient Air-to-Water
Reverse Cycle Heat Pump
Copyright 2017 Mestek, Inc.

Questions and Answers

  • M
    Matthew CabreraAug 2, 2025
    What to do if my Space Pak Heat Pump unit will not start?
    • D
      David SuarezAug 2, 2025
      If your Space Pak Heat Pump unit isn't starting, there are several potential causes. First, ensure that the unit is receiving the correct power supply (220-240 60Hz). Then, check for any loose or broken wires and repair or replace them as needed. Finally, check the circuit breaker.
  • J
    John GomezAug 9, 2025
    Why is my Space Pak Heat Pump compressor running but not cooling or heating enough?
    • M
      Mark AndersonAug 9, 2025
      Several factors can cause insufficient cooling or heating when the compressor is running. These include insufficient pipe insulation (add or repair insulation), a dirty coil (clean the coil), or low water flow. Low water flow can be due to a dirty strainer screen (clean it), a blockage (clear the blockage), air in the piping (remove the air), or a problem with the water pump (verify its operation and condition).
  • D
    Dana HarperAug 14, 2025
    What to do if there is low compressor suction pressure in cooling in my Space Pak LAHP48?
    • F
      Faith LarsonAug 14, 2025
      Low compressor suction pressure during cooling can be caused by insufficient or no water flow. Try to clean the strainer screen, clear any blockages, and remove air from the piping. Also, verify the operation and condition of the water pump. If you're trying to cool in a low ambient environment, contact Technical Support for the procedure to modify fan operating parameters.
  • J
    Jason SanfordAug 21, 2025
    How to fix high compressor discharge pressure in cooling for Space Pak LAHP48 Heat Pump?
    • N
      Natalie HobbsAug 21, 2025
      High compressor discharge pressure during cooling is often due to a dirty coil. Cleaning the coil should resolve this issue.
  • P
    Patrick DonaldsonAug 26, 2025
    Why is there high compressor discharge pressure in heating in my Space Pak LAHP48?
    • J
      Julia BenitezAug 26, 2025
      High compressor discharge pressure during heating is often caused by low water flow. Ensure the flow is a minimum of 10 GPM.

Summary

SECTION 1: READ BEFORE PROCEEDING

Codes and Electrical Requirements

Outlines compliance with installation codes and electrical standards for the unit.

SECTION 2: LAHP FIELD ADJUSTABLE PARAMETERS

Programming and Saving the Parameters

Step-by-step guide for adjusting and saving unit parameters.

SECTION 3: SPECIFICATIONS AND RATINGS

SECTION 5: LOCATION & MOUNTING

SECTION 8: START-UP AND TEST

Preparing For Start-Up

Initial steps before starting the unit.

LAHP Control Wiring Connection

How to connect the unit's control wiring.

BEFORE Starting The Unit

Critical checks before powering on the unit.

Starting The SpacePak LAHP

General procedure for starting the heat pump.

SECTION 9: ELECTRICAL DIAGRAMS

Figure 15 SpacePak LAHP - Pictorial Wiring Diagram

A visual representation of the unit's internal wiring.

Figure 16 SpacePak LAHP Electrical Ladder Diagram

A schematic showing the electrical logic and flow.

Figure 17 Field Connections

Guide for connecting external wiring to the unit terminals.

Figure 18 Wiring Diagram

Overview of system wiring for multiple components like thermostats and air handlers.

SECTION 10: FAULT CODES

Figure 19 Fault Codes

Table listing alarm displays, types, and system responses.

Figure 20 Troubleshooting Suggestions

Guide for diagnosing and resolving common unit issues.

SECTION 11: ANNUAL MAINTENANCE

Perform Annual Inspection

General overview of annual maintenance tasks.

Inspection of System

Detailed inspection of unit components and connections.

SECTION 12: REPLACEMENT PARTS

Figure 20 Replacement Parts LAHP48

A list of replaceable parts with their part numbers.

Space Pak LAHP48 Specifications

General IconGeneral
SEERUp to 16
Phase1
RefrigerantR-410A
Cooling Capacity48000 BTU/h
Heating Capacity48000 BTU/h
Voltage208-230V

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