15
HEATPUMP OPTION
This option is factory set and can be confirmed by the
above message under the 'OPTION'
With the heatpump option the unit can operate as a
standard chiller or as a heatpump. The mode selection
can be made at the control panel or remotely by a
voltage free contact or a signal from a remote ISN
controller Bacnet or Modbus.
15.1 Heatpump Mode Selection
If under the OPTION key the REMOTE / LOCAL mode is
set to LOCAL the mode of operation can also be set
under the OPTION key as follows.
To change the mode of the unit press the 'OPTION' key
and then repeatedly press the 'ENTER/ADV' key until
the mode is displayed. The mode is changed using the
'UP ARROW' and 'DOWN ARROW' keys. After the
mode is changed the 'ENTER/ADV' key must be
pressed to enter the setting into memory.
Selecting 'CHILLER' will mean that the operation of the
unit is described in the other sections of this manual.
Selecting 'HEATPUMP' means that primary capacity
control of the unit is under leaving hot liquid control with
a secondary capacity control related to leaving cold
liquid temperature. The remaining operation of the unit
is as describe in the other sections of the manual.
If under the OPTION key REMOTE/LOCAL mode is set
to REMOTE the mode is determined either by a voltage
free contact connected to -XTBC1 terminals 13 and 50,
closed for HeatPump operation or by a signal from a
remote ISN controller, Bacnet or Modbus.
In both remote and local modes the operating mode can
be viewed under the OPTION key. The messages are:
These messages are not updated dynamically, exit and
re-enter the message to display any changes.
15.2 OPER DATA Key
Pressing the 'OPER DATA' key followed by the 'DOWN
ARROW' key displays the Leaving Liquid Temperature
Hot (LLTH) and the Return Liquid Temperature Hot
(RLTH) when the optional temperature sensors are
fitted.
15.3 SETPOINTS Key
When CHILLER MODE is selected the following
setpoint displays are as for a standard chiller units and
the Hot setpoint is not displayed
When HEATPUMP MODE is selected the cold leaving
liquid temperature 'SETPOINT' and 'RANGE' can be
viewed or programmed by pressing the 'SETPOINTS'
key. After pressing the key the 'SETPOINT' and
'RANGE' entry message is displayed:
Refer to Section 7 for details of programming.
Pressing the 'SETPOINTS' key a second time will
display the hot leaving liquid temperature 'SETPOINT'
and 'RANGE' entry message:
The hot leaving liquid temperature 'SETPOINT' can be
set in the range 30 to 52°C. The hot leaving liquid
temperature 'RANGE' can be set between 0.5 to 5°C.
Refer to Section 7 for details of programming.
Pressing the 'SETPOINTS' key a third time will display
the remote 'SETPOINT' and 'RANGE'. These values
apply to the H SETP not the C SETP set point. Any reset
signals set the actual H SETP DOWN by the offset
figure.
15.4 Leaving Liquid Temperature Control
Leaving liquid control is based on Hot leaving liquid
temperature against a Hot Leaving Liquid Temperature
Set Point and
Range (Heating) to determine unit
loading. Load time is 60 seconds below the heating
range. Unload time is 30 seconds above heating range
up to 0.28°C above heating range. Between 0.28°C and
0.83°C above heating range unload time is 15 seconds.
Above heating range plus 0.83°C unload time is 10
seconds.
1
-
46
Form 201.26.OI1(11/09)
C S E T P
=
6 . 0 ° C
R A N G E
=
+ / - 1 . 1 ° C
H S E T P
=
5 0 . 0 ° C
R A N G E
=
+ / - 1 . 5 ° C
R E M
S E T P
=
4 2 . 0 ° C
R A N G E
=
+ / - 1 . 5 ° C
Y C W L H E A T P U M P
U N I T
Y C W L
M O D E
S E L E C T E D
C H I L L E R
OR
Y C W L
M O D E
S E L E C T E D
H E A T P U M P
Y C W L
O P E R A T I N G
M O D E
C H I L L E R
OR
Y C W L
O P E R A T I N G
M O D E
H E A T P U M P
L L T H
=
4 8 . 0 ° C
R L T H
=
4 2 . 0 ° C