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Model
LAHP48
Air to Water Heat Pump — Installation, Operation & Maintenance Manual
Section 1: READ BEFORE PROCEEDING
For information not included in this manual,
see the following:
This manual includes only basic
information for installation, operation and mainte-
nance of SpacePak air to water heat pumps. For
more advanced applications and information not
shown in this manual, contact SpacePak for assis-
tance and supplemental instructions. Call 413-564-
5530 in Westfield, MA or visit our website at www.
spacepak.com to send an email or review technical
literature.
Qualified installer only
—
This product must be installed only by a qualified
service technician. The installation must be done
using recognized industry practices, and in
compliance with this manual and all applicable
codes. Failure to comply could result in death,
serious injury or substantial property damage.
Hazard Definitions
The following terms are used throughout this manual to bring
attention to the presence of potential hazards or to important
information concerning the product.
Indicates an imminently hazardous situation, which
if not avoided, WILL result in death, serious injury or
substantial property damage.
Indicates an imminently hazardous situation, which
if not avoided, COULD result in death, serious
injury or substantial property damage.
Indicates an imminently hazardous situation, which
if not avoided, MAY result in minor injury or property
damage.
Used to notify of special instructions on installation,
operation or maintenance, which are important to
equipment, but not related to personal injury haz-
ards.
Model LAHP Overview
The SpacePak Model LAHP48 Low Ambient Heat Pump is a self-
contained reverse cycle heat pump that provides a continuous
supply of heated or chilled water for various purposes, such as:
residential or small commercial building heating and cooling;
and specialty applications, such as computer room cooling or
industrial/agricultural conditioning and dehumidification.
The Major Components of the LAHP48 are:
Model LAHP Heat Pumps are specifically configured to provide
water at 80-140°F (45-60°C) at ambient temperatures as low
as -8°F (-22°C) for medium temperature hydronic heating in
moderate to cold winter climates. Additionally, cooling capacity
of 3.3 tons is available in summer at water temperatures from
42-60°F conditions up to 95°F (35°C) outdoor ambient.
• A hermetically sealed, Enhanced Vapor Injected scroll
refrigeration compressor & motor. The Enhanced Vapor
Injection system draws heat from the liquid refrigerant,
subcooling the charge for maximum heat capacity under
extreme cold conditions, and uses that heat energy to
increase the compression, and therefore usable heat,
produced by the compressor.
• A generously sized outside coil to absorb heat (in heating
mode) from the surrounding ambient air, or reject heat (in
cooling mode).
• Two variable-speed motorized fans to force air through the
outside coil.
• A brazed-plate refrigerant-to-water heat exchanger to supply
heat (in heating) to the delivered water flow, or absorb heat
(in cooling).
• A dedicated thermal expansion valve to throttle the refrigerant
flow in heating and an electronically controlled expansion
valve to manage Vapor Injection operation, responding to
varying load on the system.
• Additionally, the system contains a reversing valve (to select
between heating and cooling operation) and sensors and
safety circuits to monitor and protect the equipment from
potentially damaging or dangerous operating conditions.
The water circuit passes through the internal brazed-plate heat
exchangers, and contains sensors to measure entering and
leaving water temperatures. A mechanical flow switch safety
ensures continuous water flow while the refrigerant system is
operating.
All components are contained within a supporting structure and
enclosure sufficient to allow stand-alone outdoor installation in
all temperate climates.
All operation and protections are managed by a microprocessor
controller which operates the individual systems, determines
all operating parameters, and monitors the condition of each
system. A simple interface communicates with the indoor air
handler, heat exchanger, or other load.
Codes and Electrical Requirements
• This product must be installed in accordance with all
applicable codes. Where instructions in this manual differ
from specific local requirements, defer to the local codes.
• The electrical installation must also comply with the latest
edition of: in the U.S. — National Electrical Code ANSI/NFPA
No. 70; in Canada — CSA C22.1 Canadian Electrical Code
Part 1. Wiring must be N.E.C. Class 1. Use only copper wire,
rated for 90°C (194°F) and sized for the load listed in this manual.
• Electrical shock hazard — Disconnect all electrical power
before servicing the unit. Also, the unit must be grounded in
accordance with the Electrical Code listed above.
Refrigerant
• The refrigeration system is factory charged with R410A
refrigerant, and requires no additional service during
installation. Any repair, diagnosis or maintenance service
to the refrigeration system must be performed by a qualified
technician. No alternate refrigerants, lubricants or additives
are approved for this unit. Any use of alternate or non-
approved materials in the refrigeration system may result in
personal injury or equipment damage, and will void the
manufacturer’s warranty.
