Condenser Location; Condenser Water Connections; Operating Limits For Stable Operation (No Mode Changeover); Operating Limits For Changeover Between Modes - Carrier Aquaforce 30XAS Series Installation, Operation And Maintenance Instructions

8 - HEAT RECLAIM CONDENSER OPTION (OPTION 50)

8.3 - Condenser location

The heat reclaim condenser is located between the air-cooled
condensers on the upper part of the chassis, support-ed by two
cross rails. The water inlet and outlet are on the same side.

8.4 - Condenser water connections

8.4.1 - Connection diagram
The water flow switch must be installed at the water inlet of the
installation that arrives at the heat reclaim condenser.
Legend
1 Heat reclaim condenser
2 Entering water temperature sensor (supplied)
3 Leaving water temperature sensor (supplied)
4 Condenser water flow switch (supplied)
5 Three-way valve (not supplied)
8.4.2 - Three-way valves
It is strongly recommended to install a three-way valve in the
system (not supplied with the unit). A 0-10 V output is available
on the unit electronic board to control this valve. The valve allows
bypassing of the heat reclaim condenser entering/leaving circuit
to ensure unit operation with heat reclaim at low entering water
temperature (< 12.5 °C). It also ensures an optimal and controlled
leaving water temperature.
8.5 - Operating limits for stable operation (no
mode changeover)
8.5.1 - Cooling only mode
Please refer to the earlier chapters in this manual:
- Unit operating range
- Evaporator water flow rate
8.5.2 - Heat reclaim mode
Condenser water temperature, °C
Water entering temperature at start-up
Water entering temperature during operation
Water leaving temperature during operation
Evaporator water temperature, °C
Water entering temperature at start-up
Water entering temperature during operation
Water leaving temperature during operation
(1) The water entering temperature at start-up must not be lower than 12.5 °C.
For installations with a lower temperature a three-way valve must be used.
NOTE: If the temperature at the evaporator is below 4 °C, a glycol/water solution or
the frost protection option must be used.
In part-load operation, the limitation of the condenser leaving
water temperature is due to the operating range of the screw
compressor. If the condenser leaving water temperature is above
the limit value given in the curves below, the unit will automatically
change over to the mode without heat recovery:
26
Part load operating limits (evaporator leaving water
8.6 - Operating limits for changeover between
modes
From cooling only to heat reclaim and vice versa.
Heat reclaim condenser water temperature, °C Minimum Maximum
Water entering temperature
Minimum Maximum
Ambient operating temperature
12,5 55
(1)
20 55
(1) -20 °C with winter operation option (option 28)
25 60
Minimum Maximum
- 45
6,8 21
3,3 15
6 5
6 0
5 5
5 0
4 5
4 0
3 5
3 0
2 5
2 0
0 5
Evaporator leaving water temperature, °C
Full load
Part load limit, approx. 60%
Minimum load limit, approx. 30%
temperature = 7 °C)
60
55
50
45
40
100 90 80 70
Unit load, %
1 0 1 5
60 50 40 30
12,5 57,5
-10 45
(1)