Specifications
29
Dead band
Condenser
water
temperature
Cycling time
HR stopped
HR operating
HR
setpoint
HR=Heatreclaimmode
This cycling will lead to a water temperature change in the
condenser loop. Based on the stability required, the water
loop must be more or less significant.
2°C 40 l/kW*
3°C 30 l/kW*
4°C 20 l/kW*
5°C 15 l/kW*
* kW: cooling mode capacity
The number of cycles is limited to 4 per hour
Please refer to the 30RB controls manual for more
information on the control logic of the condenser loop.
If the evaporator frost protection option is ordered,
electric heaters protect the two heat exchangers against
frost. However, the evaporator connection pipes are not
protected. It is recommended to add pipe protection at the
time of installation (glycol, heat insulation, heaters etc.).
1 Evaporator
2 Heat reclaim condenser
3 Air condenser (coils)
4 Compressor
5 Expansion device (EXV)
6 Solenoid valve: heat reclaim mode
7 Solenoid valve: cooling mode
8 Solenoid valve: charge recovery in heat reclaim mode
9 Solenoid valve: charge recovery in cooling mode
10 Check valve
11 Pressure and temperature measurement to calculate the liquid subcooling to
optimise the charge recovery
The heat reclaim condenser option is only available on
units with two circuits. It was designed with a shell-and-
tube two-circuit heat exchanger with the coils in parallel.
The two circuits are independently controlled. This means
that one circuit can be in cooling mode and the other in heat
reclaim mode. This permits two stable control stages (100% if
the circuits are in heat reclaim mode, and approximately
50% based on the size of the circuit in operation). The
intermediate stages are obtained by cycling between the
cooling mode and the heat reclaim mode.
Entering water temperature at start-up °C 15* 55
Leaving water temperature during operation °C 20 55
Outdoor ambient operating temperature °C 0** 46
Available static pressure Pa 0 0
* The water entering temperature at start-up must not fall below 15°C. For
installations with a lower temperature an accessory 3-way valve must be
installed.
** The minimum outside temperature for heat reclaim mode is 0°C in cooling
mode and -20°C with the ‘winter operation’ option.
A flow switch on the condenser is factory-installed. The
condenser loop is protected against a flow rate that is too
low. Output 16 of the additional board of this option
allows control of the condenser pump operation that will
start up after the unit has started.
If the flow rate is too low:
- changeover to the heat reclaim mode is not permitted,
- immediate changeover to cooling mode when the flow
rate is too low and the unit operates in heat reclaim
mode.
3
4
6
5
10
11
9
8
10
7
3
4
6
5
10
11
9
8
10
7
10
10
1
2
°C