Installation Requirements; Water Temperature; Maximum System Temperature; Inlet & Outlet Water Temperature - Nyle C25W Installation, Operation, Service, Maintenance, Limited Warranty

Read all installation requirements in this manual before installation
begins. The installation must conform to these instructions and
all local and national code authority having jurisdiction.
Costs to diagnose, perform service and repair damage caused
by installation errors are not covered under the limited warranty.
Costs to correct installation errors are not covered under the
limited warranty.

WATER TEMPERATURE

MAXIMUM SYSTEM TEMPERATURE

The HPWH units covered in this manual are capable of
maintaining a maximum system/storage tank temperature of
150°F (66°C). Some commercial water heating applications
may require higher temperatures. Install a booster water heater
downstream from the storage tank for temperatures above
150°F (66°C). See Figure 8 on page 22.
INLET & OUTLET WATER TEMPERATURE
The inlet (entering) water temperature operating range for the
HPWH is 40°F to 140°F (4.4°C to 60°C). The water temperature
rise (Delta T - ∆T) through the condenser (heat exchanger) will
be approximately 8°F to 12°F (4°C to 7°C).
Outlet water temperatures up to 152°F (67°C) are possible
during normal operation. Exposure to water temperatures this
high can cause serious bodily injury or death. See Mixing
Valves and Table 5 on pages 17-18.
Service & Installation Notes:
If the inlet (entering) water temperature is outside the operating
temperature range for extended periods the control system may
lock out on high or low refrigerant pressure switch events/trips.
When the control system locks out on a refrigerant pressure
switch event the compressor will stop running, the blower and
circulation pump (on models equipped with factory installed
pump) will continue to operate. This is a hard lock out condition.
The control system is manually reset by cycling power to the
HPWH off and then on again.
The tank thermostat must not be set any higher than
(66°C) to prevent control system lock outs.
Ground water temperatures can fall below 50°F (10°C) for
extended periods during winter months in many regions. For this
reason the cold water supply lines and should not be connected
directly to the HPWH inlet or T fitted into the inlet (return) water
piping. The cold water supply lines should be connected directly
to the storage tank only. See the Piping Diagrams starting on
page 35 in this manual for more information.

SOURCE WATER TEMPERATURE

ENTERING SOURCE WATER TEMPERATURE
The entering source water temperature range of operation for
the unit is 40° - 100°F (4.4°C to 38°C). The source temperature
drop (Delta T - ∆T) through the evaporator (heat exchanger) will
be approximately 8°F to 12°F (-13°C to -12°C).
If the source water temperature is outside this operating
range the HPWH unit's Limit Thermostat will discontinue
heating operation until the entering source water temperature
returns to this operating range.
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INSTALLATION REQUIREMENTS

150°F

LOCATING THE WATER HEATER

CAUTION
PROPERTY DAMAGE!
•
All water heaters may eventually leak.
•
Do not install without adequate drainage.
INSTALLATION
Carefully choose a location for the HPWH unit. Placement is a
very important consideration for optimal performance and
safety.
Locate the HPWH near a floor drain. The unit should be located
in an area where leakage from the HPWH unit or the storage tank
it is connected to will not result in damage to the area adjacent
to the water heater or to lower floors of the structure. See Unit
Placement on page 20.

FREEZING TEMPERATURES

The HPWH unit must not be installed in space where freezing
temperature will occur, without a low ambient air kit.
Exposure to freezing ambient temperatures below 32°F (0°
C) may result in severe damage to internal components.
Damage caused by exposure to freezing temperatures is not
covered under the limited warranty.

COASTAL REGIONS

When the HPWH will be installed within 5 miles of a seacoast
the optional Corrosive Duty Package is recommended. The
corrosive duty package includes a stainless steel cabinet.
Damage caused to units not equipped
duty package in coastal regions is not covered under the limited
warranty.

HEAT SOURCE

The HPWH unit should be located where there is adequate
source water from which to extract waste heat and where the
source water cooling benefit can be utilized when possible.
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with the corrosive