Carrier Aquazone 50HQP 072, Installation, Start-Up And Service Instructions Manual

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Fig. 12 — Sloped Horizontal Unit Installation
Step 7 — Pipe Connections
Supply and return piping must be as large as the unit connections
on the heat pump (larger on long runs). Never use flexible hoses
of a smaller inside diameter than that of the water connections on
the unit. Units are supplied with either a copper or optional
cupronickel condenser. Copper is adequate for ground water that
is not high in mineral content. Should your well driller express
concern regarding the quality of the well water available or
should any known hazards exist in your area, we recommend
proper testing to assure the well water quality is suitable for use
with water source equipment. In conditions anticipating moder -
ate scale formation or in brackish water a cupronickel heat ex -
changer is recommended.
Both the supply and discharge water lines will sweat if subjected
to low water temperature. These lines should be insulated to pre -
vent damage from condensation.
All manual flow valves used in the system must be ball valves.
Globe and gate valves must not be used due to high pressure
drop and poor throttling characteristics. Never exceed the rec -
ommended water flow rates. Serious damage or erosion of the
water to refrigerant heat exchanger could occur.
Always check carefully for water leaks and repair appropriately.
Units are equipped with female pipe thread fittings. Consult the
specification sheets for sizes. Teflon
1
tape sealer should be used
when connecting water piping connections to the units to insure
against leaks and possible heat exchanger fouling. Do not
overtighten the connections. Flexible hoses should be used be -
tween the unit and the rigid system to avoid possible vibration.
Ball valves should be installed in the supply and return lines for
unit isolation and unit water flow balancing.
Pressure/temperature ports are recommended in both the supply
and return lines for system flow balancing. The water flow can be
accurately set by measuring the water-to-refrigerant heat exchang -
ers water side pressure drop. See the unit specification sheets for
the water flow and pressure drop information.
UNITS WITH WATERSIDE ECONOMIZER
OR
BOILERLESS HEAT CONTROL
Units with Complete C or Deluxe D controls and waterside econo
-
mizer or units with Boilerless Heat Control (all Deluxe D) include
an aquastat with remote sensing bulb that must be field-installed
on the incoming water piping. The remote sensing bulb must be
installed on a straight section of uninsulated pipe that provides a
good measurement of the entering water temperature. It is recom -
mended to insulate the sensing bulb after installation for better
water temperature sensing.
WELL WATER SYSTEMS (50°F EWT [ENTERING
WATER TEMPERATURE] MINIMUM)
When a water well is used exclusively for supplying water to the
heat pump, the pump should operate only when the heat pump
operates. A 24 volt, double-pole single-throw contactor can be
used to operate the well pump with the heat pump.
When two or more units are supplied from one well, the pump can
be wired to operate independently from either unit. Two 24-volt
double-pole single-throw relays wired in parallel are required. An
upsized VA transformer may be required in either case.
The discharge water from the heat pump is not contaminated in
any manner and can be disposed of in various ways depending on
local codes (e.g., discharge well, dry well, storm sewer, drain field,
stream, pond, etc.). See Fig. 13.
ELEV
ATION
LINE
WHEN MOUNTED LEVEL
1 /
4
″
1. Teflon is a registered trademark of Dupont.
CAUTION
Water piping exposed to extreme, low ambient temperatures is
subject to freezing.