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10.3 Pre-operation checks
Checks before initial start-up.
Switch off the power supply before making any connections.
After the installation of the unit, check the following before switching on the circuit breaker:
Field wiring Make sure that the field wiring between the local supply panel and unit and valves (when applicable),
unit and room thermostat (when applicable), unit and domestic hot water tank, and unit and backup heater kit have
been connected according to the instructions described in the chapter 9.7 "Field wiring", according to the wiring
diagrams and to local laws and regulations.
Fuses, circuit breakers, or protection devices Check that the fuses or the locally installed protection devices are of
the size and type specified in 14 "Technical specifications". Make sure that no fuses or protection devices have
been bypassed.
Backup heater circuit breaker Do not forget to turn on the backup heater circuit breaker in the switchbox (it
depends on the backup heater type). Refer to the wiring diagram.
Booster heater circuit breaker Do not forget to turn on the booster heater circuit breaker (applies only to units with
optional domestic hot water tank installed).
Ground wiring Make sure that the ground wires have been connected properly and that the ground terminals are
tightened.
10.4 The circulation pump
The relationships between the head and the water flow rated,the PMW Return and the water flow
rated are shown in the graph below.
DANGER
50
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