Installation Checklist; Location; Water Piping; Electrical - Nyle C25W Installation, Operation, Service, Maintenance, Limited Warranty

The list below represents some of the most critical installation
requirements that, when overlooked, often result in operational
problems, down time and needless parts replacement. This
is not a complete list. Before performing any troubleshooting
procedures use the list below to check for installation errors.
Costs to correct installation errors are not covered under the
limited warranty. Ensure all installation requirements and
instructions in this manual have been followed.

LOCATION

1. Ensure the HPWH is located where there is a adequate
supply of ambient heat for optimal performance or that the
HPWH is ducted to such a location.
2. Ensure required clearances are maintained and there is
access for servicing. See Clearances on page 13.

WATER PIPING

7. Ensure the outlet (supply) and inlet (return) water piping 3.
connected to the HPWH are not less than the connection
size on the unit. See Table 1 on page 13.
4.
8. When the HPWH is connected to a storage tank ensure the
storage tank is equipped with a properly rated and sized
Temperature and Pressure (T&P) relief valve. Refer to the
storage tank manufacturer's instructions for T&P valve sizing
and installation requirements.
NOTE: This is a critical installation requirement that must
not be overlooked.
5.
9. DO NOT install a T&P valve in the outlet (supply) water line
of the HPWH unless required by local code.
6.
Ensure isolation valves are installed on the HPWH supply
and return water line at the storage tank for servicing and
purging the air from the HPWH during start-up.
7.
Ensure the cold water supply is not connected directly to or
Tee fitted to the inlet water line on the HPWH. See the Service
and Installation Notes for Inlet & Outlet Water Temperature
on page 12. See Figure 7 and Figure 8 on page 22.
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INSTALLATION CHECKLIST

15. Connect building recirculation loop piping to the backup
8.
water heater/storage inlet on multi tank preheat piping
configurations.
16. Ensure the building recirculation loop pump is controlled by a 9.
field supplied line thermostat and that it stops the pump when
the recirculation line is hot. Your particular system may use
the included PLC to control the pump as well.
10.
17. When the HPWH unit is installed "above" the storage
tank install a Tee fitting at a high point in the outlet water line
with a purge valve to bleed air during start up.
18. Though not required, the manufacturer recommends 11.
installing a strainer at the inlet water line on the HPWH to help
prevent scale build up in the heat exchanger. Service costs to
clear blockages from the HPWH unit's heat exchanger due to
debris are not covered under the limited warranty.

ELECTRICAL

12.
21. BEFORE ENERGIZING THE UNIT ensure the power supply
voltage and phase matches the requirements on the HPWH
rating label. Damage resulting from applying the wrong
voltage or phase is not covered under the limited warranty.
13.
22. Ensure the power supply breaker or the fuses disconnect
switch are within the requirements for the unit as shown on
the HPWH rating label.
23. Ensure the power supply wiring meets the MCA (Minimum 14.
Circuit Ampacity) requirements shown in this manual and on
the HPWH data label.
24. Ensure the HPWH is properly grounded according to the 15.
instructions in this manual and local code requirements.
25. Ensure the power supply connections to the HPWH are
16.
connected properly and securely tightened.
26. Ensure all electrical connections in the HPWH control panel
17.
are securely tightened.
18.
27. When the factory supplied Temperature sensor is used:
• Insure the sensor is installed properly.
• Ensure the Temperature Sensor has been installed in a
designated temperature control opening in the mid/lower
portion of the storage tank.
• Ensure the supplied Temperature Sensor is coated with a
suitable heat transfer compound (paste).
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