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Drawing Number:
Drawing Date:
H-2-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.
21
Hot Water
SupplyLine
1/4" NormallyOpen
SolenoidValve
Normally Closed
SolenoidValve
(Full size of supply line)
S
S
Vacuum
Breaker
Sub 1
Primary
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.
Route drain per local codes
Outdoor
On-Demand
Water Heater
Cold Water Supply Line
Gas Supply Line
On-Demand
Equipment List QTY
On-Demand Outdoor 2
Water Heaters
Electronic Connection *
* Refer to On-Demand Accessories
and Model Applicability for
electronic connection details.
NOTE:
Pipes and ttings can be installed
inside a pipe enclosure or recess
box and packed with insulation
for additional protection.
Domestic Hot Water - Optional Freeze Protection
2 Outdoor On-Demand Water Heaters
Preferred Piping Installation
Outdoor
On-Demand
Water Heater
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