Version No. 1-4 - 02.06.2021
Doc. No. 992300110
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10. Taking into Operation
The cooling performance of the heat exchanger is dependent on the water flow rate available from the supply.
The water flow is dependent on the water supply system to which the heat exchanger is connected and is
affected by various factors, such as conduit pressure, conduit diameter, etc.
1. Units with water flow regulator
It is possible to adjust the water flow rate from the supply system to provide the cooling performance actually
required. Operation is controlled according to a pre-set control cabinet temperature. The control cabinet
temperature is measured by a temperature sensor situated in the intake air flow. If the target temperature is
exceeded, the water flow regulator opens the water circuit. If the temperature falls below the target
temperature, the flow regulator closes the water circuit. In this way, the heat exchanger works more efficiently
by saving water.
(a) with proportional water flow regulator (RK 2114 A632 & A891, RK 2116, RK 2124, RK 2194): max. water
flow 350 l/h
(b) with magnetic valve (RK 2125, RK 2149, RK 2192, RK 2197): max. water flow 500 l/h
1.1 Adjustment of the water flow regulator
Before opening the unit make sure that there is no supply voltage at the unit. Remove the fixing screws to open
the cover of the unit. To set the flow rate (Q) turn the thermostatic head. Set the indicator position to the
required cabinet temperature. The work’s setting of the water flow regulator is +35°C. The adjustment range is
+20°C to +50°C.
Temperature setting look-up table
Pos.
˚C
1
20
2
25
3
30
4
35
5
40
6
45
7
50
Setting
Turn clockwise or anti-clockwise to change operating temperature.
Operation
If cabinet temperature changes, the sensing bulb detects the change and results in open and closing of the flow.
If cabinet temperature increases more than the set value, the valve gradually opens and vice versa.
Warning: Since valve is purely mechanical, the valve will still actuate itself even when the unit is not
powered. Flush unit from fluids, prior to transportation to prevent any damage.
2. Units without water flow regulator
These units do not have any automatic control functions.
3. Units with Alarm Thermostat
With these units the cabinet air temperature can be monitored via a current free sensor which monitors the
cabinet air as it enters the unit. Before opening the unit always make sure that there is no supply voltage at the
unit. To set the target temperature turn the adjustment screw on the thermostat until the dial reads the correct
target temperature. The numbers on the adjustment scale show the temperature at which the alarm circuit is
closed. The Thermostat can be set to a temperature anywhere b20°C and +60°C. The work’s setting of
the thermostat is 45°C.
4. Units with Solenoid valve
