Principle Of Operation; The Refrigeration Cycle; Source Water Temperature Range; Water Temperature Range - Nyle C25W Installation, Operation, Service, Maintenance, Limited Warranty

8. Ensure the power supply voltage and phase at the job site
matches the power requirements on the HPWH rating label
before installation begins. Energizing the HPWH with the
wrong voltage or phase will cause permanent damage to the
unit.

PRINCIPLE OF OPERATION

The appliances covered by this Instruction Manual are
commercial water-to-water heat pump water heaters (HPWH).
Operation of the HPWH is simple in the fact that we are
transferring heat energy from a water source to a DHW tank by
means of a compressed refrigeration cycle. Recovering and
using this waste heat
efficiency of the building.

THE REFRIGERATION CYCLE

Refer to Figure 1 on page 12 for the location of
components mentioned in this section.
Refrigerant is circulated through the refrigeration circuit by a
Compressor. The refrigerant is a high temperature high
pressure gas when it leaves the compressor. Refrigerant
flows from the compressor through the Hot Gas Line to the
Condenser.
The condenser is a refrigerant-to-water heat exchanger with two
circuits, refrigerant flows through one circuit and water through
the other. The high temperature refrigerant gas transfers its heat
to the water flowing through the condenser. As the refrigerant
gas cools inside the condenser it changes state (condenses)
from a gas to a liquid. A
through the condenser.
Refrigerant leaving the condenser is a medium temperature
high pressure liquid. It flows through the L iquid Line to the
Thermostatic Expansion Valve. The thermostatic expansion
valve (TXV) regulates the flow of refrigerant into the
Evaporator. The evaporator is a single wall brazed plate source
water-to-refrigerant heat exchanger. The refrigerant changes
state (boils/evaporates) from a liquid state back into a gas
(vapor) in the evaporator.
The refrigerant flows out of the evaporator through the Suction
Line and into the Accumulator. The accumulator traps any
liquid refrigerant the evaporator is unable to vaporize during
low temperature operating
accumulator prevents liquid
compressor where it could damage internal components.
Low temperature, low pressure refrigerant gas (vapor) is
drawn out of the accumulator by the compressor. The
compressor increases the pressure and temperature of the
refrigerant gas circulating it
where the refrigeration cycle starts over or continues.
increases the overall energy
Water Pump circulates water
conditions.
refrigerant from entering
to the condenser

SOURCE WATER TEMPERATURE RANGE

The entering source water temperature operating range for
the HPWH is 40°F to 100°F (4°C to 38°C).
When the HPWH is operating properly the source water
temperature drop through the evaporator (heat exchanger) will
be approximately 8°F to 11°F (-13°C to -12°C).

WATER TEMPERATURE RANGE

The inlet (entering) water temperature operating range for the
HPWH is 40°F to 140°F (4°C to 60°C).
The HPWH will heat potable water up to 150°F.
When the HPWH is operating properly the water temperature
rise through the
approximately 8°F to 12°F (4°C to 7°C).

REFRIGERANT CHARGE

The HPWH is factory-charged with R-134a refrigerant. The
refrigerant charge is weighed in at the factory. See Table
9 on page 34. It should not be necessary to add or
remove refrigerant during installation or start up.

EQUIPMENT DISPOSAL

This heat pump water heater contains R-134a refrigerant and is
regulated as a stationary refrigeration appliance under Section
608 of the Clean Air Act. Disposal of this unit must be performed
in accordance with the provisions in Section 608 of the Clean Air
Act and any state or local regulations that may also apply. See
Qualifications on page 10.
The
the
again
9
condenser (heat exchanger) will be
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11