Pump Replacement - Carrier AQUASNAP 30RB series Installation, Operation And Maintenance Instructions

30RB/30RQ - 30RBY/30RQY
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 hydronic 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
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 hydronic module.
- Pump motor:
• external thermal protection (unit sizes 17 to 33 kW)
• thermomagnetic protection (only unit sizes 40 kW).
1
3
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, Carrier Service
must be asked for permission to change the Pro-Dialog + system
configuration.
Operating limits 30RB
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 30RQ
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 Carrier if an entering water temperature lower than 7.8 °C is
*
necessary.
** If glycol is used but leaving water temperatures are greater than 5°, select
option "medium brine" by the user interface. UI by selecting the "medium
brine". If you are using but the glycol outlet temperature is greater than 5 ° C,
you must select the user interface option "medium brine"
*** -13°C for units size 40kW.
Minimum and maximum water flow rates in the
plate heat exchangers
Minimum flow rate,
l/s
30RB-RQ017 0.45
30RB-RQ021 0.57
30RB026 0.67
30RQ026 0.67
30RB033 0.87
30RQ033 0.87
30RB-RQ040 1.05
* Maximum water flow rate with an available static pressure of 50 kPa (units with
hydronicmodule)
** Maximum water flow rate at a plate heat exchanger pressure drop of
100 kPa (units without hydronic module)
Water circuit water content
Whatever the size of the system, the minimum content of the water
circuit is given by the following formula:
Content = CAP x N = Litres
(kW)
where CAP is the nominal system capacity (kW) at nominal operating
conditions of the installation.
Application
Air conditioning
Industrial process cooling
E N G L I S H
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
Maximum flow rate, Maximum flow rate,
l/s* l/s**
1.4 1.3
1.6 1.5
2 1.5
2.2 1.8
2.2 1.8
2.3 1.9
2.6 2.7
N
3.5
See note
GB - 19