Potable/Space Heating - Rheem Power Direct Vent Series Use & Care Manual

Supplemental Instructions for Gas Water Heaters
Installed in Potable Water/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
heating
unit
Tee fitting for vertical hot
water supply lines.
Hot water
supply to
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)
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, tie to location approved by
local code
Gas line to water heater
Temperature and pressure relief
valve discharge line
Gas Control (Thermostat)
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.
22
Combination Potable Water and Space Heating Application
Hot water
supply to
house
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.
From HOT
DANGER: When this system
outlet on
requires water for space heating at
water heater
elevated temperatures (above 125°F
[52°C.]), a mixing or tempering valve
must be installed in the hot water
From HOT
supply line to the house in order to
outlet on
reduce the scald hazard potential.
water heater
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.
Minimum of 2 ft. (61 cm) developed
length of 3/4" pipe.
Air vent
Gas Fired
Water Heater
3/4" Tempered
domestic hot water
supply to house.
3/4" Shut-Off Valve (Typ.)
Heat Trap
6 in. (15.2
cm) Min.
2 Gallon Thermal
3/4" Shut-
Expansion Tank (if
Off Valve
required-not supplied
(Typ.)
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)
Gas Direct Vent discharge
must comply with Local
and State Codes
Vacuum Relief Valve
If required, install per local codes
6 in. (15.2 cm)
Air Gap
DANGER If this water heater is
:
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.
Notice: 50 ft. (15.2 m) maximum
distance from water heater to fan
coil (developed length) is required
for Massachusetts State.
Pressure Gauge
3/4" Check Valve with 1/8" Hole
3/4" Shut-Off Valve (Typ.)
3/4" cold water supply
Electronically controlled pump timer.
(Not Supplied)
Activates every 6 hours for 60 seconds.
Wire to bronze pump.
and valve manufacturer's
instructions.
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
Air Handler
27