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Plumbing Requirements
Overview
When planning plumbing system layout, reference the plumbing schematics within this section as a
guide to the sequence of equipment, valves, fittings, etc. The plumbing configurations for typical instal-
lations are diagrammed. In operation, it is imperative the heat pump receive water flow within the
minimum-maximum ranges specified for the particular heat pump. Should the system installation
under consideration not closely match any of the schematics, contact AquaCal Technical Support
Group for advice and guidance: (800) 786-7751.
Minimum - Maximum Water Flow Rates
• All AquaCal 100, 120, and 155 models are designed to operate successfully at flow rates of 20-
to-70 gallons-per-minute (GPM).
• Design the plumbing system to maintain at least 20-GPM flow through the heater; the heat pump
will not operate correctly, nor reliably, with less than 20-GPM of water flow supplied.
• If water flow rates through the heater will exceed 70-GPM, a spring-check bypass valve will be
required. Please contact AquaCal Engineering Group to obtain the valve specification specific to
your installation (800-786-7751).
• Generally speaking, most residential pools and spas will
not require a plumbing bypass unless a
pump of two (2) horsepower, or larger, is used. For bypass valve placement details, see
plumbing schematic contained on next page: “…Flow Greater than 70-GPM.”
Parts and Materials
Industry technology changes much too rapidly for AquaCal to specify, with exactness, any items out-
side and beyond the heat pump. What is specified is that the heater
must be installed in accordance
with all applicable local, state, or national codes & standards.
Water Connections to Heat Pump
All AquaCal heat pumps are supplied with 2" PVC plumbing unions. Connection to site plumbing is
made via PVC solvent cement to the female slip socket of the plumbing unions.
Maintain Ability to Winterize
In regions where hard freeze conditions are typical, the unions mentioned below allow for easy discon-
nection and re-connection of the heater from/to the plumbing system. Caution: Do not defeat the
function of the unions–use no glue on the threaded portion of the unions.
INSTALLATION
Use of an incorrect bypass valve may compromise the heat pump’s efficiency, reliability,
and may void the factory warranty. Please contact AquaCal Engineering Group to obtain
the valve specification specific to your installation (800-786-7751).
Failure to heed the following may result in damage to
equipment.
CAUTION !
Maximum Operating Pressure: 50-PSI
In-Line Chlorine Feeders
The titanium heat exchanger tube is nearly impervious to chemical damage; however, other parts of
the heater may be damaged by concentrated chlorine. Caution: Per chlorinator manufacturers’ rec-
ommendations, always place in-line chlorinators as low, and as far downstream from the heater as
possible.