Instructions / Assembly

27
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 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.
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 Water 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. Water heater for
combination water/space heating shall not
be used in space-heating-applications only
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 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.
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)
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.
All water piping shall be insulated in
accordance with Local and State Energy
Code.
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
See diagrams above for proper
pipe application for vertical
or horizontal supply lines.
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 in.
(15.2 cm)
Min.
3/4" Shutoff Valve (Typ.)
3/4" Check Valve with 1/8" Hole
Pressure Gauge
3/4" Shutoff
Valve (Typ.)
3/4"
Shutoff
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 ft. (61 cm)
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 Codes
Vacuum Relief Valve
(Not Supplied)
If required, install per local codes
and valve manufacturer’s
instructions.
120°F to 130°F°
140°F (60°C)
Combination Gas Control
(Thermostat)
49°C to 54°C