23
23
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 ports must be large enough to
handle the peak water flow rates through the water heating
system. See Piping Diagrams on page 4
1
for detailed piping
diagrams.
SUPPLY
DUCT
DIGITAL TANK
THERMOSTAT
HPWH
Purge Valve or T&P
(
purge air from system
)
ISOLATION
VALVES
T&P VALVE
OPENING
HOT
OUTLET
REMOTE TEMPERATURE
SENSOR OR MECHANICAL
TANK THERMOSTAT
COLD
INLET
INLET
(RETURN)
OUTLET
(SUPPLY)
STORAGE
TANK
Figure 7
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 12. 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.
20
DIGITAL TANK
THERMOSTAT
HPWH
HOT
OUTLET
STORAGE
TANK
BACKUP
WATER
HEATER
(OPTIONAL)
COLD
INLET
SUPPLY
DUCT
PRE-HEATED
WATER OUT
ISOLATION
VALVES
PRE HEATED
WATER INLET
REMOTE TEMPERATURE
SENSOR OR MECHANICAL
TANK THERMOSTAT
Purge Valve or T&P
(
purge air from system
)
T&P VALVE
OPENING
INLET
(RETURN)
OUTLET
(SUPPLY)
You individual HWP design may vary, Air Source as opposed to
Water Source. The same heated water piping design will apply.
HPWH
UNIT
Figure 9
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.
21
TEMPERATURE SENSOR INSTALLATION
The HPWH unit is shipped from the factory with a Digital
Tank Thermostat that includes a Temperature Sensor:
1. Secure the Temperature Sensor inside a Sensor or Thermal
Well .
Install the sensor well in the storage tank’s designated
temperature control opening. It is not recommended to
install the temperature probe or sensor in the bottom or the
top of the tank. It is typical to install in the mid to lower
portion of the tank.
REMOTE TEMPERATURE
SENSOR
HPWH
BACKUP
WATER
HEATER
STORAGE
TANK
Figure 10
Do not duct air from a garage or other
space where potentially harmful fumes
from solvents, chemicals or exhaust
from automobiles are present into any
other space in the building structure.
Gas and carbon monoxide detectors
are available.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
Breathing Hazard - Carbon Monoxide Gas
.
Do not install the temperature sensor near the cold water supply
connection to the storage tank to prevent short cycling.
,
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