Carrier AquaForce PUREtec 61XWHLZE 03 Installation, Operation And Maintenance Manual page 25

9 - MAJOR SYSTEM COMPONENTS AND OPERATION DATA
9.8.2 - Function description and reset:
Diagram below describes the description of operation: refer to the
machine documentation to obtain the detailed wiring diagram
Normal
Start-stop
CR1
Normal
Logic
Start-stop
Normal
Start-stop
Compressor A_C board
HPS : High Pressure Switch
CR : Relay with dry contact
KM : Power contactors
- : Circuit designation (1 or 2)
: Circuit designation (1 or 2)
The HPS switches are wired in series to the control relays of the
A_C board which controls the KM and KM-D main contactors.
Both switches are closed during continuous operation of the
compressor. When one of the HPS switches opens, the control
relay interrupts the supply voltage of the KM-and KM-D contactor
coil: the main contactor opens, which causes the compressor to
lose power and stop .
The operation of this safety loop is electromechanical: it is not
based on software or an electronic component.
9.8.3 - Restart after high pressure detection
After detecting the overpressure, it is necessary to manually reset
the switched HPS (s). Using a dull tool with a diameter of less than
6 mm if the PZHH HPS is deactivated.
9.8.4 - Checks in case of apparent failure of the
safety accessory.
If the operating pressure of the unit appears to have been
exceeded (for example: after opening of the relief valves), the unit
must be stopped immediately. The unit and the safety loop must
pass all periodic checks before any possible restart.
If the test reveals any malfunctions that could have led to exceed
the maximum allowable pressure (PS) of the device, a complete
check of all pressure equipment must be performed to verify their
mechanical integrity.
HPD SP_F
HPD SP_FA
(115Vac)
CR2
KM_D
KM_Y
400Vac
KM_D
Comressor
06T
KM_
400Vac
0v
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