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Model LAHP48 Air to Water Heat Pump — Installation, Operation & Maintenance Manual
Liquid Side
The fluid in the liquid side of the Model LAHP
must be an anti-freeze/water mix. Only Ethylene
Glycol or Propylene Glycol anti-freeze mixtures
specifically formulated for boiler or hydronic system
use are allowed.
The use of automotive glycol anti-freeze, or any alternative
such as methanol or glycerin, will immediately void the
manufacturer’s warranty.
• The antifreeze percentage must be at least 30% by volume.
This will ensure a free flowing coolant loop down to and
below the minimum operating envelop, as well as burst
protection to at least -60°F (-51°C). Therefore, a higher
concentration is not generally recommended. However, if it is
absolutely necessary to be able to “cold start” (after power
has been removed and all components have cooled to
ambient temperature) the coolant loop in extreme conditions,
it is allowable to use up to a 50% glycol solution, for free flow
down to -40°F (-40°C). However it should be noted that the
heat transfer capacity of this higher concentration is lower,
and the viscosity (system pressure drop) is significantly
higher, so the unit performance will be diminished accordingly,
and the circulator choice must be appropriate for these
conditions.
Thoroughly flush the system before filling.
• The system must be supplied with a pump sized to provide
the minimum flow rates specified in this manual. Pump
selection must consider the pressure loss through the
system and its components plus the pressure loss through
the LAHP’s heat exchanger and internal components. The
pump must be rated for use with chilled water/glycol mixture.
• Install a y-strainer at the liquid input of the heat pump as
shown in this manual to prevent damage to the heat
exchanger from sediment.
• DO NOT use for potable water heating. The single-wall heat
exchanger is not suitable for the application.
Ambient Operating Limits
• The LAHP48 is designed to deliver optimal performance in
ambient temperatures ranging from -8°F (-22°C) to 95°F
(35°C). Operation outside of these limits is not prohibited,
as internal protective circuits will prevent dangerous or
destructive conditions. However operation outside of this
range will result in significantly diminished performance and
may result in spontaneous shut down of the heat pump if the
protective safety features are engaged.
Contact SpacePak Technical Support for assistance if more
advanced configuration is desired, 1-800-465-8558.
Standard Equipment
• Heat pump, including a refrigeration system, factory-pro-
grammed controller, fans and all required internal compo-
nents
• Powder-coated enclosure
• Pump and piping by others
Additional Components Required
• Expansion tank, properly sized for system volume.
• Buffer Tank (properly sized).
Recommended Accessories
• SpacePak heat pump interface module
• SSIC
• Multi-Chiller controller (for multiple heat pump installations)
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