33
IOM, VS/VT Models, Rev A Enertech Global
Desuperheater Installation
Units that ship with the desuperheater function also
ship with a connection kit. Installation of the kit and
examples of connection to the potable water system
is described in the following steps and drawings.
Note:
Enertech Desuperheater water to refrigerant
heat exchangers are double walled and vented for
use in potable water systems.
Note: ALL Enertech Global products meet the
requirements of NSF-372 (Lead Free).
Note: Copper is the only approved material for
desuperheater piping.
Note: Units that are shipped with a desuperheater
do not have the desuperheater pump wires
connected to the electrical circuit, to prevent
accidentally running the pump while dry. Pump
has to be connected to the electric circuit (master
contactor) when the lines from the water heater are
installed & air is removed.
Plumbing Installation
Note: All plumbing and piping connections must
comply with local plumbing codes.
TIP: Measure the distance above the oor or shelf
that the water heater is sitting on, to where the drain
valve is located. This distance must be greater than
one-half the width of the tee you’re about to install,
or you won’t be able to thread the tee on to the
water heater.
1. Disconnect electricity to water heater.
2. Turn off water supply to water heater.
3. Drain water heater. Open pressure
relief valve.
4. Remove drain valve and tting from water
heater.
5. Thread the ¾” MPT x 3-1/2” nipple into the water
heater drain port. Use Teon tape, or pipe dope
on threads.
6. Thread the center port of the ¾” brass tee to
the other end of the nipple.
7. Thread one of the copper adaptors into the end
of the tee closest to the heat pump.
8. Thread the drain valve into the other end of the
nipple.
9. Above the water heater, cut the incoming cold
water line. Remove a section of that line to
enable the placement of the copper tee.
10. Insert the copper tee in the cold water line.
11. Thread the remaining two ½”SWT x ¾”MPT
copper adaptors into the ¾” FPT ttings on the
heat pump, marked HWG IN and HWG OUT.
12. Run interconnecting ½” copper pipe from
the HOT WATER OUT on the heat pump, to the
copper adaptor located on the tee at the
bottom of the water heater.
13. Run interconnecting ½” copper pipe from the
HOT WATER IN on the heat pump, to the copper
tee in the cold water line.
14. Install an air vent tting at the highest point of
the line from step 13 (assuming it’s the higher of
the two lines from the heat pump to the water
heater).
15. Shut off the valve installed in the desuperheater
line close to the tee in the cold water line. Open
the air vent and all shut off valves installed in the
“hot water out”.
16. Turn the water supply to the water heater on. Fill
water heater. Open highest hot water faucet to
purge air from tank and piping.
17. Flush the interconnecting lines, and check for
leaks. Make sure air vent is shutoff when water
begins to drip steadily from the vent.
18. Loosen the screw on the end of the
despuerheater pump to purge the air from the
pump’s rotor housing. A steady drip of water
will indicate the air is removed. Tighten the
screw and the pump can be connected to the
contactor or terminal block.
19. Install 3/8” closed cell insulation on the lines
connecting the heat pump to the water heater.
20. Reconnect electricity to water heater.
Section 6: Desuperheater Installation
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