Potable/Space Heating - Rheem PVR50-80 (NAT) Use And Care Manual

Supplemental instructions for gas water heaters installed
in potable/space heating applications.
Local codes or plumbing authority requirements may vary from the instructions or diagrams provided
in this manual and take precedent over these instructions.
Hot water
supply to
house
Hot water
supply to
From HOT
heating
outlet on
unit
water heater
Tee fitting for vertical hot
water supply lines.
From HOT
Hot water
outlet on
supply to
water heater
house
Hot water supply
to heating unit
Tee fitting for horizontal hot
water supply lines.
Typical Piping Diagram for Combination Potable/Space Heating Installation
Spring loaded check valve in heating
unit hot water supply line and cold
water return line (not supplied with
water heater)
NOTE: This check valve is
incorporated in some heating units.
Refer to the installation instructions
supplied with specific heating unit to
determine if it is required.
Isolation valve in hot water supply line
to heating unit
(not supplied with water heater)
See diagrams above for proper
pipe application for vertical
or horizontal supply lines
Temperature and Pressure
Relief Valve
Gas line to water heater
Water Heater Jacket
Temperature and pressure
relief valve discharge line
Combustion Air Inlet
Openings
Combination Potable and Space Heating Application
Tee fitting must be installed as shown.
This ensures that any air in the water lines
will be purged through the domestic water
faucets and showers.
DANGER: When this system
requires water for space heating at
elevated temperatures (above 125°F
[52°C.]), a mixing or tempering valve
must be installed in the hot water
supply line to the house in order to
reduce the scald hazard potential.
DANGER: Any piping or components
used in the installation of this water
heater in a combination potable and
space heating application must be
suitable for use with drinking water.
Air vent
Mixing or
tempering
valve (refer
to warning
DANGER
installed in an application intended to
supply domestic hot water needs and
hot water for space heating purposes,
do not connect the heater to an existing
heating unit or components of a heating
system that have previously been used
with a non drinking water system. Toxic
chemicals such as those used for boiler
treatment may be present and will
contaminate the drinking water supply
causing possible health risks. Never
introduce toxic chemicals, such as those
used for boiler treatment, into this
system.
Domestic hot water supply
Heat Trap
6" Min.
above)
Shut-Off
Valve
Isolation valve in cold
water return line from
heating unit (not
supplied with water
heater)
Cold water
return line from
heating unit
Hot water
supply line
into heating unit
Drain valve
(not supplied with water
heater)
6" Air Gap
If this water heater is
:
Incoming cold
water supply
Thermal Expansion
Tank (if required-not
supplied with water
heater)
Heating unit
15