Westinghouse WGRGH20**75F Series Installation, Start-Up, Maintenance, Parts, Warranty page 21

NOTES:
1. The Heating Application Kit (Part #
8100P-049, not included with the water
heater) MUST BE installed when using an
air handler. Failure to install the Heating
Application Kit when using the water
heater for heating applications WILL
VOID product warranty.
2. Minimum pipe size should match
connection size. Upsize pipe accordingly
if greater flow is required.
3. A thermal expansion tank suitable
for potable water must be sized and
installed within this piping system
between the backflow preventer and the
cold water inlet.
4. All circulators should have an integral
flow check.
5. Drains and check valve between water
heater and piping will assist in purging
air from system.
6. These drawings are meant to
demonstrate system piping only. The
installer is responsible for all equipment
and detailing required by local codes.
In Massachusetts, you must install a
vacuum breaker per 248 CMR.
7. Always shut off power to the water
heater or isolate the heater from the
system if ANY plumbing work is to be
done. Running the water heater without
water will result in dry-firing.
8. Thermostatic mixing valve should
o
be set 5 F below the maximum stored
tank temperature setpoint. For example:
o
125 F stored tank temperature setpoint
o
= 120 F thermostatic mixing valve
setpoint.
9. When using a Recirculation Pump,
ensure the pump is controlled by a
timer or wall type aquastat to prevent
scalding.
NOTES FOR AIR HANDLER
APPLICATION:
1. MASSACHUSETTS
PLUMBING CODE REQUIRES
DISTANCE NO GREATER THAN 50
FEET FROM THE WATER HEATER TO
THE FAN COIL IN THE AIR HANDLER.
2. MASSACHUSETTS
PLUMBING CODE REQUIRES
AN ELECTRONICALLY TIMED
CIRCULATOR PUMP TO ACTIVATE
EVERY SIX HOURS FOR 60 SECONDS.
THIS CIRCULATOR IS REQUIRED TO
BE BRONZE OR STAINLESS.
3. ALL WATER PIPING MUST BE
INSULATED.
4. YOU MUST INSTALL A VACUUM
RELIEF VALVE PER 248 CMR.
NOTE:
THESE DRAWINGS
MEANT TO DEMONSTRATE SYSTEM
PIPING ONLY. THE INSTALLER IS
RESPONSIBLE FOR ALL EQUIPMENT
AND DETAILING REQUIRED BY
LOCAL CODES.
Figure 13 - Water Heater with Air Handler without Internal or External Recirculation – NOTE: There is a
Built-In Flow Check in the Internal Recirculation Pump Loop
STATE
A
STATE
ARE
Figure 14 - Water Heater with Air Handler and Recirculation – NOTE: There is a Built-In Flow Check in the
Internal Recirculation Pump Loop; NOTE: The recirculation pump needs to be controlled by a timer or wall
type aquastat to prevent scalding.
whl-605 Rev. 002 Rel. 000 Date 1.23.19
21