Multiple Set Point Control - Rotex RKHBRD011ABV1 Manual De Instalación

Multiple set point control

If you want to use multiple set point control, a temperature reducing
device ( ) is needed. The temperature reducing device converts
the high inlet water temperature to a reduced water outlet
temperature which will be delivered to the appliance(s).
When temperature reducing devices are installed, the system can be
configured to use multiple water set points.
The water set points can be selected in function of multiple set point
operation patterns.
Below the 2 possible patterns are explained in detail.
Multiple set point control according to pattern A
During normal operation, domestic water heating and space heating
modes are separated and activated intermittent to fulfil a
simultaneous request. Therefore multiple set point pattern A can be
configured to allow simultaneous domestic water heating and space
heating operation without intermission.
Schematic overview:
Pattern A design
Space 1 DHW
TRD
1
Protection is required by means
of a temperature reducing
device ( ) (depending on
set point)
Indoor unit
1 Domestic hot water shut off valve (field supply)
Domestic hot water tank
Temperature reducing device
Space 1 Space 1
Balancing bottle
■
During space heating operation, water is provided based on the
selected water temperature set point for space heating. A
shut-off valve (field supply) must be installed in the domestic hot
water tank coil circuit. The valve must be closed to protect the
domestic hot water tank from cooling down by lower temperature
water going through the coil during space heating. Connection
and control of this shut off valve is the responsibility of the
installer.
■
During domestic water heating operation, the water temperature
set point is normally higher than the set point requested during
space heating operation. The valve allowing water to enter the
domestic hot water tank coil is open. The heat pump will deliver
water with a higher temperature which is needed for production
of the domestic hot water. At that time, the lower temperature
appliances have to be protected against the higher water
temperature by a temperature reducing valve.
The configuration of pattern A allows 2 space heating set points and
one (same as in the classic design) domestic hot water set point.
Installation manual
29
Classic design
M
Space 1
DHW
The request signals for space heating can be implemented in 2
different ways (installer choice):
■
thermo ON/OFF signal (from external room thermostat)
Space 1 Space 2 DHW
TRD TRD
■
status signal (active/not active) from the corresponding
temperature reducing device (
Space 1 Space 2 DHW
TRD TRD
Indoor unit
Domestic hot water tank
Temperature reducing device
Space 1 Space 1
Space 2 Space 2
Balancing bottle
The electrical connections on the unit should be done on the optional
demand PCB.
The configuration of pattern A is done by field settings:
1 Select the appropriate pattern: [7-02]=0
Turn on multiple set point 1: [7-03]=0 ➞ [7-03]=1
2
Turn on multiple set point 2: [7-04]=0 ➞ [7-04]=1
3 Enter the temperature multiple set point 1: [A-03] (see below)
Enter the temperature multiple set point 2: [A-04] (see below)
Configuration example:
Set Field
point setting
(a)
Domestic 70°C [b-03]
hot water
Space 1 65°C [A-03]
Space 2 35°C [A-04]
Resulting heat pump water
(a) The water temperature needed to reach this set point of course is higher
than 70°C.
Indoor unit for air to water heat pump system
)
Thermo status
OFF ON OFF OFF OFF
OFF ON/OFF ON ON OFF
OFF ON/OFF ON OFF ON
OFF >70°C 65°C 65°C 35°C
RKHBRD011~016ABV1+Y1
4PW61218-1C – 2012.06