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Mixing valves are available at plumbing supply stores. Consult
a Qualifi ed Installer or Service Agency. Follow the mixing valve
manufacturer's instructions for installation of the valves.
TABLE 5
CONTAMINATED WATER
This HPWH unit must not be used to heat any fl uid other than
water. Corrosive chemicals must not be introduced into the
waterways in this HPWH unit.
TEMPERATURE-PRESSURE RELIEF VALVE
This heat pump water heater should only be connected to
a storage tank with a properly rated/sized and certified
combination temperature - pressure relief valve. The valve
must be certifi ed by a nationally recognized testing laboratory
that maintains periodic inspection of production of listed
equipment of materials as meeting the requirements for Relief
Valves for Hot Water Supply Systems, ANSI Z21.22 • CSA 4.4,
and the code requirements of ASME.
When the HPWH unit is connected to a storage tank a
temperature and pressure relief valve must be installed in the
designated opening for the T&P valve per the storage tank
manufacturer's requirements. The T&P valve's Btu/hr rating
must be equal to or greater than the total heating input rating
of all water heaters connected to the storage tank. If more
than one water heating unit is connected to the storage tank
the aggregate total of all heating input ratings of all connected
unit must be factored when choosing a T&P valve for the
storage tank.
The pressure rating of the T&P valve should always be rated
equal to or below the working pressure rating of the storage
tank or water heater, whichever rating is lower.
Contact the manufacturer of the storage tank for assistance
in sizing of a temperature and pressure relief valve. Follow the
storage tank manufacturer's instructions regarding the proper
installation of these products.
TANK SELECTION
The HPWH unit is not an instantaneous water heater and must
be connected to a storage tank. Storage tank confi gurations
must meet these criteria:
1.
The HPWH must not be connected directly to a standard
gas or electric water heater.
2.
If the HPWH is connected to a used storage tank, the tank
should be thoroughly cleaned of scale and sediment before
the HPWH is installed.
3.
Connection ports used on the storage tank must permit
the recommended fl ow rate through HPWH. The connection
ports used on the storage tank must not be smaller than
the inlet outlet connection sizes on the HPWH unit. See
Table 4 on page 12.
4.
Water heated by the HPWH should be returned to the
tank at a location that is above the level of the tank's cold
water inlet and/or the heat pump's inlet source.
5.
The HPWH unit's inlet and outlet lines to the storage tank
should be dedicated. Example: no other line (such as a
building re-circulating loop or cold water supply) should
be connected to the HPWH unit's inlet or outlet water
lines.
SOLAR TANKS
Solar tanks should be used with caution. Some solar tanks
with top connections have dip tubes which may signifi cantly
reduce the effi ciency performance of the HPWH unit.
Before using any solar tank in this application, contact your
representative or call the toll free technical support number
on the back cover of this manual for further assistance.
Potentially harmful fumes and vapors could be introduced
into occupied spaces. See Unit Placement on page 15.
STORAGE & HANDLING
The heat pump water heaters covered in this manual are
stationary refrigeration units. Careful handling is necessary to
prevent internal damage.
13
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