Water Piping - Cadet 40-120 Installation And Service Manual

14
Combi
(continued)

Water piping

Field connections are to be made as represented in FIG. 14-3.
A field-supplied anti-scald device MUST be installed as shown in FIG. 14-3. Anti-scald devices must be
WARNING
selected and installed in accordance to local codes. Failure to do so will result in scald or serious injury. The
Combi is capable of supplying domestic water greater than 120°F which may scald.
Ensure that plumbing and electrical installation are complete and supply gas is turned OFF. On initial startup, bleed air from the
system with the manual air vent on the primary boiler heat exchanger, as well as the manual air vent on the DHW pump, while
flowing domestic water in excess of the flow switch setting until all air has escaped. Be sure to connect a hose to each air vent to
allow the air and water to properly exit the unit. This process will energize the DHW pump and enable purging of air from low
mass water carrying components.
Adjustment of the anti-scald device should be set to a safe temperature to prevent injury. The anti-scald device MUST be set so
that the outlet water temperature will never exceed 120°F.
Figure 14-3 Single Boiler - Primary Secondary w/Combi Piping Diagram
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
MAKE UP WATER
SYSTEM SUPPLY
SENSOR
(OPTIONAL)
TO
SYSTEM
SYSTEM
BALL VALVE
CIRCULATOR
(TYPICAL)
EXPANSION
TANK
DRAIN POINT
(TYPICAL)
Please note that this illustration is meant to show system piping concept only, the installer is responsible for
NOTICE
all equipment and detailing required by local codes.
PRESSURE
GAUGE
AIR
SEPARATOR
MAY SUBSTITUTE LOW LOSS HEADER
NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART
Y-STRAINER
(RECOMMENDED)
BOILER
CIRCULATOR
BOILER
PRESSURE
RELIEF VALVE
UNION
(TYPICAL)
TEMPERATURE /
PRESSURE
GAUGE
FROM
SYSTEM
FLOW SWITCH
TEMPERATURE & PRESSURE
RELIEF VALVE (REQUIRED)
ANTI-SCALD
MIXING VALVE
(REQUIRED)
FLOW
CHECK
DRAIN
HOT
COLD
WATER
WATER
SUPPLY SUPPLY
Installation & Service Manual
EXPANSION
TANK
IMG00254
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