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Drawing Number:
Drawing Date:
H-1-E
September 07, 2008
NOTE: This drawing is not intended to describe a complete system and is not a replacement for a pro-
fessional engineering drawing. It is intended only as a guide and does not imply compliance with local
building code requirements. Confer with local building officials before installation. The Contractor or
engineer is to determine the necessary components and configuration of the particular system to be in-
stalled. It is the responsibility of the engineer or contractor to ensure that the installation is in accordance
with all local building codes.
20
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3
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Minimum 3/4" Hot Water
SupplyLine
S
S
1/4" Minimum
Normally Open
SolenoidValve
3/4" Minimum
Normally Closed
SolenoidValve
Vacuum
Breaker
Outdoor
On-Demand
Water Heater
Route drain per local codes
Gas Supply Line
Domestic Hot Water - Optional Freeze Protection
1 Outdoor On-Demand Water Heater
Preferred Piping Installation
On-Demand
Equipment List QTY
Outdoor On-Demand 1
Water Heater
NOTE:
outside building structure. These are indicated
by being above the dashed line.
line should be located inside the building
structure.
The vacuum breaker line should be located inside
the building structure.
NOTE:
enclosure or recess box and packed with insulation
for additional protection.
IMPORTANT!
With electrical power supplied to a on-demand water heater, it will not freeze
in enviornments as cold as -30 F, when protected from direct wind exposure.
In the event of a power failure at temperatures below freezing, the water
heater should be drained of all water to prevent freezing damage.
The unit may be drained manually or through the installation of the
Optional solenoid valves as shown.
The electrical connections for the two solenoid valves should be tied to
the 120 V power terminals provided on the PC Board of the water heater.
When the electrical power to the water heater fails, the cold water supply
drain down solenoid valve opens, allowing the water heater and
associated piping to drain. Ensure that you run the drain for the solenoids
per local codes.
º
Key
Pressure Relief Valve
Check Valve
3/4" Union
3/4" Ball Valve
Boiler Drain Valve
Solenoid Valve
S
Pressure Regulator
Circulating Pump
Mixing Valve