2424
2424
24
WMTWMT
WMTWMT
WMT
090914 RC090914 RC
090914 RC090914 RC
090914 RC
High THigh T
High THigh T
High T
echech
echech
ech
REGULAREGULA
REGULAREGULA
REGULA
TION SYSTEMTION SYSTEM
TION SYSTEMTION SYSTEM
TION SYSTEM
GENERAL OPERATING PRINCIPLES
The regulation PCB input data is directly linked to the demands expressed by the indoors units
(demands for compressor, fan, 4 ways valve). These inputs, associated with an outdoors
sensor, provide a truth table translating the unit’s operating characteristics in each mode.
Fan
The fan operation is linked directly to the outdoors temperature.
The values for passing from Low Speed to High Speed are determined by the operating mode.
Compressor
The regulation system includes anti-short cycle protection for the compressor to avoid
excessive start/stop actions than could damage its operation.
SAFETY PROTECTION
The machine is protected against any malfunctions by 2 levels of HP protection.
A first level of protection by an automatic reset safety protecting the machine when the
condensing temperature has exceeded the set threshold.
A second level of protection by a manual reset safety activated when the condensing
pressure is higher than the threshold set by the safety pressostat.
It is important to check the quantity of the refrigerant charge in the system if these protection
devices are activated repeatedly.
The HP protection is only activated for the unit A or B in question. The other circuit will
continue to operate normally.
DE-ICING
The regulation system provides automatic control of the de-icing function for the outdoors
exchanger in relation to outdoors temperature conditions
When one of the units triggers the demand for de-icing, the entire system (units A and B) is
de-iced simultaneously.
To Next Page
Loading...
