Potable/Space Heating - Rheem Residential 30 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
Nominal 3/4" size mixing or tempering valve
(refer to warning above). Follow mixing or
tempering valve manufacturer's instructions for
installation of the valve.
Spring loaded check valve in
heating unit hot water supply line
and cold water return line (not
supplied with water heater)
NOTICE: 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)
Temperature and
Pressure Relief
Valve, tie to location
approved by local
code
Gas line to water heater
Temperature and
pressure relief valve
discharge line
Water Heater drain pan
installed in accordance
with the Local and State
Code
Water Heater to be in
accordance with the
Local and State Energy
Code
All water piping shall be
insulated in accordance
with Local and State
Energy Code.
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.
NOTICE: Suitable for (potable) water
heating and space heating applications. DO
NOT use for space heating application only.
Minimum of 2'-0" developed length of
3/4" type "L" copper from the water heater
connection.
Air vent
3/4" Shut-
Off Valve
(Typ.)
Gas Fired
Water Heater
Gas Direct Vent discharge
must comply with Local and
State Code
Combustion Air Inlet
Openings
DANGER
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.
NOTICE: 50' - 0" maximum
distance from water heater to fan coil
(developed length) is required for
Massachusetts State.
3/4" Tempered
domestic hot water
supply to house.
3/4" Shut-Off
Valve (Typ.)
Heat Trap
6" Min.
2 Gallon Thermal
Expansion Tank (if
required-not supplied
with water heater)
3/4" HWS & HWR
to Heating Coil.
Drain valve
(not supplied with water heater)
Isolation valve in
cold water return line
from heating unit (not
supplied with water
heater)
Vacuum Relief Valve
(Not Supplied)
6" Air Gap
If required, install per local codes
and valve manufacturer's
instructions.
If this water heater is installed
:
Pressure Gauge
3/4" Check Valve with 1/8" Hole
3/4" Shut-Off Valve (Typ.)
3/4" cold water supply
Piping loop between
water heater and fan
coil shall be flow guard
gold CPVC or equal
Air Handler
Electronically controlled pump
timer. Activates every 6 hours for 60
seconds. Wire to bronze pump.
Hot water
to space heater
Hot water coil
All bronze pump.
Check valve internal
in pump.
Air bleed valve.
Water Sample Tap.
To HVAC
Unit.
FAN
T
ON
OFF
HEAT
COOL
17