Carel MuC2SE, User Manual

Page: 27 / 40

27
µC
2
SE process c030220416
- rel. 2.3 - 17.05.2018
6.8 Hot gas bypass
The hot gas by-pass in temperature mode function allows to increase the temperature of the output water from the evaporator. The output enabled is
the controller analogue output Y1 (water-water chiller) or Y2 (air-water chiller) of the I/O expansion board.
Par. Description Def Min Max U.M.
H25 Hot gas by-pass
0/1 = disabled/enabled 0 0 1 -
H26 Hot gas by-pass in stand-by
0/1 = disabled/enabled 0 0 1 -
6.9 Pump down
This function allows the unit to be stopped while avoiding the possible formation of liquid refrigerant inside the evaporator. When the only active
compressor is called to stop, the expansion valve is closed so as to depressurise the circuit. Valid only when the driver is installed, as the driver
pressure probe is used
Par.
Description Def Min Max U.M.
H13 Enable pump down 0 0 1 -
H14 Pump down minimum pressure 2 0 50 bar
H15 Pump down maximum time 30 0 180 s
6.10 Heaters management
r43 defines the relationship between absolute set-point, intended as electric heaters activation threshold and relative set-point, i.e. electric heaters
activation threshold referring to an operational set-point. For example, if r43 = 7, the anti-freeze/support heater will activate below the value of r01-
A04, instead of A04.
Par. Description Def Min Max U.M.
r43 Heaters set-point:
0=A04, A08, A11, P16, P19 absolute
1=A04, P16, P19 absolute, A08, A11 relative
2=A08, A11, P16, P19 absolute, A04 relative
3=P16, P19 absolute, A04, A08, A11 relative
4=A04, A08, A11 absolute, P16, P19 relative
5=A04 absolute, A08, A11, P16, P19 relative
6=A08, A11 absolute, A04, P16, P19 relative
7=A04, A08, A11, P16, P19 relative 7 0 7 -
Regarding the activation set-points of the heaters, when the temperature measured by the probe B1/B2 (see A06) drops below the value of the
parameter A08/A11 the heater or heaters activates, if the respective outputs are set with the parameter H11.
A08
B1or B2
ON
A09
OFF
A11
A09
Key
B1/B2 Support heaters probe
Par. Description Def Min Max U.M.
A06 Auxiliary heater probe
0=Control probe (B1)
1=Anti-freeze probe (B2) 0 0 1 -
A08 Heater 1 set point (see r43) 5 A01 80 °C/°F
A08 Heater 1 relative set point (see r43) 2 0 20 °C/°F
A09 Heaters differential 2 0.3 50 °C/°F
A11 Heater 2 set point (see r43) 7 A01 80 °C/°F
A11 Heater 2 relative set point (see r43) 7 0 20 °C/°F