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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 heaters represented within this manual are designed to operate successfully at flow
rates of 30-to-70 gallons-per-minute (GPM).
• Design the plumbing system to maintain at least 30-GPM flow through the heater under worst
case conditions (i.e.: filter fouled to 10 psi rise); the heat pump will not operate correctly, nor
reliably, with less than 30-GPM of water flow supplied. These specifications relate to heater
only;
code-specified whole system turnover rates must be satisfied.
• If water flow rates through the heater will exceed 70-GPM, a spring-check bypass valve will be
required. Install AquaCal P.N.: 2556 5-LB bypass check valve, or bypass check valve equal to Del
Industries PN: CO-0103. See drawing, top of next page, for install location in site plumbing.
• 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.”
Approved 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
Maximum Static or 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.
CAUTION !!! Installations with In-floor Cleaning Systems
In-floor cleaning systems, dependent upon varying site circumstances, may create water hammer
conditions throughout the water circulation system. Water hammer is very damaging to the plumbing
system and connected devices. Where an in-floor cleaning system is (or will be) installed, AquaCal
strongly recommends a water hammer suppression stand pipe assembly within the plumbing circuit.
For additional information, please contact AquaCal Customer Support (800-786-7751) and request
Technical Service Bulletin: AQ P-1031, Water Hammer Abatement with In-Floor Cleaning Systems.