Binder KBF 240 - Functional Check of the Cooling System

Troubleshooting
4.4 Functional check of the cooling system
To test the function of the cooling system you can use the following functions tables.
During program course use a multimeter to measure the output signal at the analog output AA1 (pins 17 and
18) of the controller MB1 I/O-board (-3N2).
The clocking of the corresponding valves can be detected by the corresponding LED.
The values given under X indicate the start values. The values given under W indicate the target values to be
triggered. The target values must not be reached for the test, it is sufficient to watch them during the first five
minutes.
Humidity switch (-8S1) ON
Temperature / Humidity
Solenoid valve
(-7Y1 ),
Binary output BA2
on controller MB1
I/O-board,
large evaporator
Solenoid valve
(-7Y2 ),
Binary output BA3
on controller MB1
I/O-board,
small evaporator
Analog output AA1 on
controller MB1 I/O-
board, controller cooling
X: Temperature: 20°C to 25°C
68°F to 75°F
Humidity: < 95 % r.H.
W: Temperature: 10°C / 50°F
Humidity: 95 % r.H.
Clocking
on / off
2 / 15
seconds
Clocking
on / off
2 / 15
seconds
According to regulation
ratio of temperature
initially ≤ 5 V DC
gradually decreasing
if X=W then 0 V
X:
Temperature: 20°C to 25°C
68°F to 75°F
Humidity: 50 % r.H.
W: Temperature: 10°C / 50°F
Humidity: 0 % r.H.
Clocking at least
1 minute
on / off
2 / 15
seconds
then completely “OFF”
Clocking
on / off
2 / 15
seconds
According to regulation
ratio of temperature and
humidity
initially ≤ 5 V DC
gradually decreasing
if X=W then 0 V
X: Temper
ature: 20°C to 25°C
68°F to 122°F
Humidity: < 50 % r.H.
W: Temperature: 50°C / 122°F
Humidity: 95 % r.H.
“OFF”
Clocking
on / off
2 / 15
seconds
near 0 V
See also chap. 10.5, “checking the step motor valve”.
Service Manual KBF (E5.2) 04-2015 25