User manual

µC
2
SE process chiller +030220416 - rel. 2.2 - 25.01.2013
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.
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.
ON
OFF
F05
B3/B4F06
FAN
1°C/0.5 bar
F07 F06
F05
0%
F03
F04
FAN
SPEED
B3/B4
Par. Description
Def Min Max U.M.
F01
Fan
0 = absent; 1 = present
0 0 1 -
F02
Fan: operating mode
0 =Always on
1 = In parallel to compressor
2 = On/Off
3 = Speed control
0 0 3 -
F03 Minimum voltage threshold for Triac 35 0 F04 step
F04 Maximum voltage threshold for Triac 75 F03 100 step
F05 Fan speed se
t
point in pressure 13 /11 /12 ba
r
F05 Fan speed se
t
point in temperature 35 -40 176 °C/°F
F06 Fan speed differential in pressure 3 0 30 ba
r
F06 Fan speed differential in temperature 10 0 50 °C/°F
F07 Minimum fan speed differential in pressure
5
0 F05 bar
F07 Minimum fan speed differential in temperature 15 0 50 °C/°F
F11
Fans peak speed
0 = function disabled
0 0 120 s
F12 Triac impulse duration 2 0 10 s
F14
Fan with high condensing temperature when
starting
0 = Disabled
0 0 999 s
Par. Description
Def Min Max U.M.
H25 Hot gas by-pass
0/1 = disabled/enabled
001 -
H26 Hot gas by-pass in stand-by
0/1 = disabled/enabled
001 -
Par. Description
Def Min Max U.M.
H13 Enable pump down
0
01 -
H14 Pump down minimum pressure
2
050ba
r
H15 Pump down maximum time
30
0 180 s
25