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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 8. 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.
FIGURE 8
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.
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 .
2.
Install the sensor well in the storage tank's designated
16
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.
Do not install the temperature sensor near the cold water
supply connection to the storage tank to prevent short cycling.
FIGURE 9
INSTALLATION CHECKLIST
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 source water for optimal performance.
2.
Ensure required clearances are maintained and there is
access for servicing. See Clearances on page 9.
WATER PIPING
3.
Ensure the outlet (supply) and inlet (return) water piping
connected to the HPWH are not less than the connection
size on the unit. See Table 1 on page 7.
4.
Ensure swing-type check valves (not spring-loaded types)
are installed on outlet lines of all heat pumps plumbed in
parallel to prevent hot water short-circuiting.
5.
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. Call the toll free technical support phone
number at the back of this manual for further assistance.
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