Pump Replacement, Unit Protection Devices - CIAT EREBA ACCESS T 017 Manual De Instrucciones

10 - PUMP REPLACEMENT, UNIT PROTECTION DEVICES

Pump replacement
If the water pump needs to be replaced, proceed as follows:
- Disconnect the unit from the power supply.
- Open/remove the access panel/s
- Electrically disconnect the pump.
- Empty all water from the hydraulic module.
- Loosen the pipe unions 1 and 3.
- Remove the four pump fixing screws 2.
- Replace the pump.
- Fit the pump fixing screws 2.
- Tighten the pipe unions 1 and 3.
- Electrically connect the pump.
- Connect the unit to the power supply.
- Make sure the pump rotates in the right direction using the hole in
the back panel.
- Reinstall the lateral access panel.
1 pipe union
2 screw
3 pipe union
2
Safety considerations related to protection
devices
Safety accessories
Refrigerant Side
High pressure switch
(3)
External relief valve
Rupture disk
Fuse plug
Heat transfert fluid side
External relief valve
(1) Classified for protection in normal service situations.
(2) Classified for protection in abnormal service situations. These accessories are
sized for fires with a thermal flow of 10kW/m². No combustible matter should
be placed within 6.5m of the unit.
(3) The instantaneous over-pressure limitation of 10% of the operating pressure
does not apply to this abnormal service situation.
The control pressure can be higher than the service pressure. In this case either
the design temperature or the high-pressure switch ensures that the service
pressure is not exceeded in normal service situations.
(4) The selection of these discharge valves must be made by the personnel
responsible for completing the hydraulic installation.
1
3
Over pressure protec-
(1)
tion in case of an exter-
(2)
nal fire
X
X
X
X
(4) (4)
Description of unit protection devices
The unit includes the following protection devices:
- Internal compressor protection.
- Fan motor internal thermal protection (unit sizes 26, 33 and 40kW).
- Main switch.
- Thermomagnetic control and heaters protection.
- Thermomagnetic fan protection (unit sizes 17, 21 and 40 kW).
- Defrost thermostat.
- Fault detector for the temperature and pressure sensors.
- High pressure switch: this protects the unit against excessive condensing
pressure.
The high pressure switch has factory-fixed non-adjustable settings.
The appliance stops due to the intervention of the high pressure alarm
threshold, before the high pressure switch intervenes.
This function is performed by the electronic control device via a pressure
transducer.
- Low pressure switch: This function is performed by the electronic control
device via a pressure transducer.
Only on appliances with hydraulic module.
- Pump motor:
• external thermal protection (unit sizes 17 to 33 kW)
• thermomagnetic protection (only unit sizes 40 kW).Table III: Pressure
switch settings
High pressure switch (017 to 033)
High pressure switch (040)
CAUTION: Alteration of factory settings other than the design set-point,
without manufacturer's authorisation, may void the warranty.
In case of use other than the manufacturer configuration, CIAT Service must
be asked for permission to change the Pro-Dialog + system configuration.
Operating limits EREBA ACCESS T
These units have been designed to operate within the following limits:
Evaporator
Water entering temp. (at start-up)
Water leaving temp. (in operation)
Condenser
Air entering temperature
Operating limits EREBA ACCESS HT
Cooling cycle
Plate heat exchanger
Water entering temp. (at start-up)
Water leaving temp. (in operation)
Coil:
Air entering temperature
Heating cycle
Plate heat exchanger
Water entering temp. (at start-up)
Water leaving temp. (in operation)
Coil:
Plate heat exchanger
Contact CIAT if an entering water temperature lower than 7.8 °C is necessary.
*
** For low-temperature applications, where the leaving water temperature is below
5°C, a frost protection solution must be used.
*** -13°C for units size 40kW.
EN - 15
Cut-out Reset
44 bar Manual
44.2 bar Automatic
Minimum °C Maximum °C
7.8* 30
5** 18
-10 48
Minimum °C Maximum °C
7.8* 30
5** 18
-10 48
Minimum °C Maximum °C
10 45
20 50
Minimum °C Maximum °C
-15*** 40
EREBA ACCESS 17 - 40 T/HT
EN