Instructions / Assembly

16
Tee fitting for vertical hot
water supply lines.
Hot water
supply to
house
From HOT
outlet on
water heater
Hot water
supply to
heating
unit
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.
Tee fitting for horizontal hot
water supply lines.
From HOT
outlet on
water heater
Hot water
supply to
house
Hot water supply
to heating unit
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 valve complying
with the Standard for Temperature
Actuated Mixing Valves for Hot Water
Distribution Systems, ASSE 1017
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 combination
water (potable) heating and space
heating and not suitable for space
heating applications only.
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 previ-
ously 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.
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
cold water return line
from heating unit (not
supplied with water
heater)
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.
Temperature and pressure relief
valve discharge line
Air Handler
Drain valve
(not supplied with
water heater)
Hot water
to space heater
Temperature and Pressure Relief
Valve, tie to location approved by
local code
Isolation valve in hot water supply
line to heating unit (not supplied with
water heater)
3/4" cold water supply
3/4" Tempered
domestic hot water
supply to house.
Gas line to water heater
6” Air Gap
Combustion Air Inlet
Openings
2 Gallon Thermal
Expansion Tank (if
required-not supplied
with water heater)
Air vent
Heat Trap
6” Min.
3/4" Shut-Off Valve (Typ.)
3/4" Check Valve with 1/8" Hole
Pressure Gauge
3/4" Shut-Off Valve (Typ.)
3/4" Shut-
Off Valve
(Typ.)
Hot water coil
All bronze pump.
Check valve
internal in pump.
Air bleed valve.
Water Sample Tap.
T
FAN
ON
OFF
HEAT
COOL
To HVAC Unit.
Electronically controlled pump timer.
Activates every 6 hours for 60 seconds.
Wire to bronze pump.
3/4" HWS & HWR
to Heating Coil.
Minimum of 2'-0" developed length
of 3/4" pipe.
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
Gas Fired
Water Heater
Gas Direct Vent discharge
must comply with Local
and State Code
Vacuum Relief Valve
(Not Supplied)
If required, install per local codes
and valve manufacturer’s
instructions.
120° to 130°F
140°F
See diagrams above for proper
pipe application for vertical
or horizontal supply lines.
Water heater jacket
All water piping shall be insulated
in accordance with Local and State
Energy Code.