Specifications
24
30RB option 118A 232 262 302 342 372 402 432 462 522
kW 220 249 283 320 354 377 413 437 488
kW 76 101 108 125 132 151 156 175 198
Unit with option 15 kg 2398 2580 3229 3429 3518 3658 4241 4381 4591
Unit with option 15 + dual-pump hydronic
module option kg 2638 2818 3539 3739 3868 3998 4591 4781 5011
Standard unit kg 2208 2390 2999 3199 3268 3398 3951 4091 4281
Circuit A kg 29 29 42.5 44 45.5 46 55 57 57
Circuit B kg 29 29 31 31 45.5 46 47 47 57
* Nominalconditions:evaporatorentering/leavingwatertemperature=12°C/7°C.Outdoorairtemperature=35°C
** Weight shown is a guideline only.
Entering water temperature at start-up °C 6.8 40
Leaving water temperature during operation °C 5 15
Outdoor ambient temperature °C 0 48
Available static pressure Pa 0 0
Ambient temperature (option 28) °C -20 48
Entering water temperature at start-up °C 6.8 40
Leaving water temperature during operation °C 5 26
Outdoor ambient operating temperature °C -25 20
Available static pressure Pa 0 0
1. Evaporator
2. Air condenser (coils)
3. Three-way valve
4. Compressor
5. Check valve
6. Refrigerant pump
7. Check valve
8. Expansion device (EXV)
The change-over between the cooling and free-cooling modes
is automatically controlled (it is possible to block the change-
over to free-cooling by reconfiguring the machine - see
Controls IOM). The configurable parameters permitting
change-over are the outside air temperature and the leaving
water temperature set-point. As soon as the temperature
difference LWT
stp
- OAT is above 8 K the current capacity in
cooling mode is calculated and compared with the theoretical
free-cooling capacity. This comparison authorizes/stops the
change-over to free-cooling.
After change-over to free-cooling all compressors are
stopped (the compressor functions are bypassed). As soon
as the valves open, the free-cooling pumps are started. This
change-over logic takes around 10 minutes. Taking this
timing into consideration only one change-over cooling -
free-cooling is authorized per hour.
If the capacity supplied in the free-cooling mode is insuffi-
cient (set-point not reached), the unit automatically
changes over to cooling mode.
To optimize operation in free-cooling mode we strongly
recommend to use the set-point offset function. This
favours the change-over to free-cooling and increases the
capacity in free-cooling mode.
4
6
5
3
8
3
6
1
2
2
4
5
8
7 7