Single Tank Configuration; Multiple Tank Configuration; Standard Tank Thermostat - Nyle C25W Installation, Operation, Service, Maintenance, Limited Warranty

15. All components in the hot water supply system must be
adequately sized to meet peak water flow requirement
16. When the HPWH unit is installed above the storage tank
install a Tee fitting at a high point in the outlet water line
leaving the unit. Install a purge valve, or if required by local
code, a T&P valve (temperature and pressure relief) in a
branch of the Tee fitting that can be used to purge air from
the HPWH unit during start up. See Figure 7 and Figure 8.
17. DO NOT install a (T&P) relief valve in the outlet line of the
HPWH unit unless required by local code.
18. Dielectric unions should be installed at the inlet and
outlet water lines to the HPWH unit.
19. All HPWH water piping must be insulated.

SINGLE TANK CONFIGURATION

The HPWH must be plumbed to storage tank. The maximum
stored water temperature the HPWH unit can produce in the
storage tank is 150°F (66°C). Figure 7 shows a typical storage
tank piping configuration. Tank p orts m ust b e l arge e nough to
handle the peak water flow rates through the water heating
system. See Piping Diagrams startingon page 35 for detailed
piping diagrams.
Purge Valve or T&P
(purge air from system)
OUTLET
(SUPPLY)
INLET
(RETURN)
ISOLATION
VALVES
REMOTE TEMPERATURE
SENSOR OR MECHANICAL
TANK THERMOSTAT
MULTIPLE TANK PRE HEAT CONFIGURATION
When water temperatures above 150°F (66°C) are required the
HPWH and storage tank are piped in series (upstream) with a
backup water heater. See Water Temperature on page 14. The
backup water heater will raise the temperature of the preheated
water to the final system temperature required. Figure 8 shows a
typical preheat piping configuration.
22 22
HPWH
SUPPLY
DUCT
T&P VALVE
OPENING
STORAGE
HOT
TANK
OUTLET
DIGITAL TANK
THERMOSTAT
COLD
INLET
Figure 7
Purge Valve or T&P
(purge air from system)
OUTLET
(SUPPLY)
INLET
(RETURN)
ISOLATION
VALVES
REMOTE TEMPERATURE
SENSOR OR MECHANICAL
TANK THERMOSTAT
You individual HWP design may vary, Air Source as opposed to
Individual HPWH deigns may vary. (Air source as opposed
to water source.) The same heated water piping design will
Water Source. The same heated water piping design will apply.
apply.
HPWH
UNIT

STANDARD TANK THERMOSTAT

Standard tank thermostats (Aquastat) already installed in the
storage tank may be used instead of the factory supplied Digital
Tank Thermostat if desired. Ensure the standard tank thermostat
is installed the lower third of the tank. Wire the existing
tank thermostat to the HPWH terminal strip.
20
HPWH
SUPPLY
DUCT
T&P VALVE
OPENING
PRE-HEATED
WATER OUT
HOT
STORAGE
OUTLET
TANK
BACKUP
WATER
HEATER
(OPTIONAL)
DIGITAL TANK
PRE HEATED
THERMOSTAT
WATER INLET
COLD
INLET
Figure 8
Figure 9