Storage Tank Installation and Operation Manual
7
Do not install a manual shut off valve
between the relief valve and the discharge.
Doing so could cause serious injury or
death if the relief valve released and the
manual valve was closed. This would
cause excessive build-up of pressure in
the storage tank which could result in an
explosion.
Drain
The tanks’ drain connection must be piped to a suitable floor
drain. Brass drain cocks are acceptable. A brass full port ball
valve is recommended to improve water flow.
Completing installation
Installation of the Lochinvar Heat Pump Storage Tank is
now complete. All documentation supplied with the unit
should be passed along to maintenance personnel for future
reference.
Piping the relief valve
(Relief valve is field
supplied)
All Lochinvar Heat Pump Storage Tanks are equipped with a
relief valve tapping on the tank. The valve should be piped to a
discharge line leading to a suitable drain. Piping the pressure
relief valve to a suitable drain will prevent both water and heat
damage to the unit, as well as reduce the risk of injury from
released heated water. The pipe must be of adequate size to
properly handle the capacity of the relief valve and discharge
line.
Check local codes to assure compliance. If a check valve has
been installed on the inlet water line, thermal expansion may
take place causing build up of excessive pressure when the
water is being heated. This expansion will cause the relief
valve to open, releasing hot water to the discharge line. A
properly sized expansion tank must be installed to protect the
system from water expansion.
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WARNING
2
Installation
(continued)
Aquastat bulbwell
Review the controls for the hot water source equipment. Some
equipment or systems designs will require an independent
aquastat (field supplied) to control the equipment. The
aquastat may be surface mounted onto the sheet metal jacket
of the tank or a nearby surface. Water sensing probes may be
installed into one (1) of the four (4) dry bulbwells supplied
with all Lochinvar Heat Pump Storage Tanks. The equipment
may employ a water sensing thermistor. The thermistors
would be installed into any one of the dry bulbwells then
wired back to the hot water equipment.
In installations with more than one water heater, more than
one probe may need to be installed in the storage tank.
The super bulbwell has a bulb depth of 7-5/16" and can
accommodate a 3/8" diameter sensor/bulb. An aluminum
adapter sleeve is supplied to allow a 1/4" diameter sensor well
to be used.
