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24 | Piping
PIPING
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. LV Units
are supplied with either a copper or optional cupro-
nickel condenser. Copper is adequate for ground water
that is not high in mineral content. (refer to Water
Quality table on page#22)
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.
(refer to Water Quality table on page#22)
In conditions anticipating moderate scale formation or in
brackish water a cupro-nickel heat exchanger is
required. Both the supply and discharge water lines will
sweat if subjected to low water temperature. These lines
should be insulated to prevent 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.
Always check carefully for water leaks and repair
appropriately. Units are equipped with female pipe
thread fittings. Consult the specification sheets for
sizes.
Teflon tape sealer should be used when connecting
water piping connections to the units to ensure against
leaks and possible heat exchanger fouling. Do not
overtighten the connections. Flexible hoses should be
used between 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 exchangers water side
pressure drop. See the unit specification sheets for the
water flow and pressure drop information.
NOTICE: Water piping exposed to extreme,
low ambient temperatures is subject to
freezing
NOTICE: Never exceed the recommended
water flow rates. Serious damage or erosion
of the water to refrigerant heat exchanger
could occur.
8 733 944 336 (2016/09)
OPTIONS
Extended Range Option
LV heat pumps are supplied standard with capillary style
expansion device tuned to typical boiler/tower system
operating conditions. For applications that will
experience more extreme fluid flow rates or
temperatures (heating fluid temperatures below 50°F
and/or cooling fluid temperatures below 60°F or above
100°F), an extended range option is required.
The extended range option on the LV consists of a bi-
flow, balanced port thermal expansion valve and an
insulated water-to-refrigerant heat exchanger. With the
extended range option installed LV units can provide
heating with fluid temperatures as low as 20°F and as
high as 80°F and cooling with fluid temperatures as low
as 50°F and as high as 110°F.
Unit Mounted Non-Fused Disconnect
Switch
LV heat pumps can be supplied with an optional unit
mounted disconnect switch mounted to the electrical
corner post of the unit.
Field electrical wiring is connected to the switch and the
switch then routes power to the heat pump electrical
box. When the switch is in the "OFF" position, the heat
pump electrical box is completely de-energized.
Hot Gas Reheat
(Available on size 015 and larger)
LV series heat pumps size 015 and larger can be
provided with hot gas reheat for active dehumidification.
In operation hot gas reheat dehumidifies space by
cooling the air and removing moisture and then
reheating the air back to a neutral temperature using
waste heat from the compressor. The net effect is to
decrease the relative humidity of the space without
changing the sensible temperature.
The major components of the hot gas reheat option are
the hot gas reheat coil, the reheat solenoid valve and the
control circuit. When the control circuit energizes the
heat pump in reheat mode, the heat pump will operate
in the cooling mode. The hot gas solenoid valve diverts
the compressor discharge gas to the reheat coil which is
mounted downstream of the unit evaporator.This hot
gas re-heats the cooled air coming off of the evaporator.
To function, heat pumps with hot gas reheat must be
controlled by both a thermostat and a humidistat (or a
combination thermostat/humidistat). The humidistat
must provide a dry contact closure on a rise in humidity
above set point.
Note that the ability of the reheat coil to reheat cooled
air back to a neutral temperature is affected by the
water temperature of the system.
Subject to change without prior notice
LV Heat Pump Series
LV Heat Pump Series
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