38
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
* Weight shown is a guideline only.
11.1.1 - Operating limits
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
11.1.2 - Operation
1. Evaporator
2. Air condenser (coils)
3. Three-way valve
4. Compressor
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
11.2.1 - Physical data for 30RB units with total heat reclaim condenser option
Unit with heat reclaim option kg 2340 2610 3200 3420 3480 3610 4290 4430 4620
Unit with heat reclaim option and option 15 kg - 2800 3440 3660 3740 3870 4590 4730 4930
Shell-and-tube condenser with nned copper tubes
Water volume l 22 22 22 22 22 22 46 46 46
Max. water-side operating pressure kPa 1000 1000 1000 1000 1000 1000 1000 1000 1000
Victaulic
Connection in. 3 3 3 3 3 3 4 4 4
Outside diameter mm 88.9 88.9 88.9 88.9 88.9 88.9 114.3 114.3 114.3
* Standard coil ** Copper/aluminium coil (option 254) *** Weight shown is a guideline only.
5. Check valve
6. Refrigerant pump
7. Check valve
8. Expansion device (EXV)
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