31
R
S
V
CH
4
J7
CH
1
--
R
S
V
--
J2
--
C
H
13
CH
3
J4
CH
2
--
--
G
+
12
STATUS
--
T
P
V
CH13
J3
CH
12
J1
24VAC
--
SI
O
J9
SIO
CH
11
--
11
CH
10
--
J5
T
P
V
CH14
3
2
1
--
3
2
1
CH
8
--
--
G
+
CH
7
--
J6
C
H
14
CH
6
--
J8
CH
5
CH
9
•
Connector J2: Discrete outputs CH 1 to 4 for electric
heating stages 1 to 4.
•
Connector J3: Discrete output CH 6 for for the control of a
directional on/off three-way valve.
•
Connector J6: Analogue inputs CH 11 for outside
temperature sensors.
•
Connector J6: Analogue inputs CH 12 for information on
domestic hot-water requirements.
•
Connector J7: Analogue inputs CH 13 for information on
domestic hot-water requirements.
•
Connector J8: Analogue inputs CH 14 for information on
summer operation only (domestic hot-water only).
To apply the different configurations required, refer to the
instructions in the BW10 Control manual.
11 - START-UP
11.1 - Preliminary checks
•
Never be tempted to start the unit without reading fully,
and understanding, the operating instructions and without
having carried out the following pre-start checks:
•
Check the chilled water circulation pump operation with
the Quick Test function.
•
Check the air handling units and all other equipment
connected to the evaporator. Refer to the manufacturer’s
instructions.
•
Check the condensing loop water circulation pump
operation with the Quick Test function.
•
For units without hydronic module, the water pump
overheat protection devices must be connected in series
with the pump contactor power supply.
•
Ensure that there are no refrigerant leaks.
•
Confirm that all pipe securing bands are tight.
•
Confirm the the electrical connections are secure.
•
Avoid a long common power wiring connection run inside
the unit close to the control or signal wiring.
•
Observe the clearances on each unit side to facilitate
maintenance.
•
The unit wiring for all options offered is not insulated. The
insulation only protects against running condensa-tion.
•
To ensure that no condensate can run under the unit, a
condensate pan must be added under the unit that collects
100% of the condensate.
•
If work is required in a control box or on the compressor
wiring, the phase order must be verified with a quick test
(refer to the BW10 Control manual. The compressors
cannot support prolonged operation (>30 seconds) with
reversed phases.
•
Ensure that the last refrigerant charge made by the service
team corresponds with the charge given on the name plate
- otherwise the operating ranges and the unit efficiency
will be impaired. The required tolerance for the charge is
±2%.
•
Before start-up ensure that the unit is level (1.5 mm/m).
ATTENTION: Use of units in an open loop is forbidden.
11.2 - Actual start-up
IMPORTANT
•
Commissioning and start-up of the unit must be
supervised by a qualified refrigeration engineer.
•
Start-up and operating tests must be carried out with a
thermal load applied and water circulating in the
evaporator and condenser.
•
All set-point adjustments and control tests must be
carried out before the unit is started up.
Ensure that all safety devices are operational, especially that
the high pressure switches are switched on and that the
alarms are acknowledged.
10 - BW10 UNIT OPERATION WITH SPECIFIC HEATING
CONTROL (OPTION 153)
10.1 - Operating principle
BW10 units are specially designed to optimise the operation of
heating installations that require hot-water production for a
traditional heating system and domestic hot-water production.
The control system of the BW10 units includes algorithms that
permit constant automatic optimisation of:
•
control of a directional on/off three-way valve based on
the heating or domestic hot water requirements,
•
control of the electric heating stages allowing relief of the
heating loop,
•
hot-water setpoint reset (heating application) based on the
air temperature,
•
priority control between heating application and entre
domestic hot-water application.
NOTE: The installer is responsible for ensuring that the
installation complies with the applicable legislation in terms
of electrical and thermal safety.
10.2 - Auxiliary electronic board (AUX1) - analogue and
digital inputs and outputs
Содержание BW10 020-090
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