Operating Limits With The Heat Recovery Accessory; Evaporator Water Flow Rate Limits; Recovery Water Flow Rate Limits - Hitecsa EWMIM Serie Manual De Instalación, Uso Y Mantenimiento

I.3.2

OPERATING LIMITS WITH THE HEAT RECOVERY ACCESSORY

The chiller can be fitted with the DS partial heat recovery unit accessory. In that case, operating limits are the same as the unit without accessory.
The desuperheater (DS) can be managed according to two modes selectable from the machine control panel (ECONOMY mode and STANDARD
mode). If the "ECONOMY" mode is selected, the unit will work to optimize the efficiency of the unit to the detriment in some situations or in ambient
conditions of low air temperature, of the hot water production temperature and consequently of the time of achievement. of the desired thermal value.
The "STANDARD" mode, on the other hand, foresees the priority in the production of hot water with possible penalization of the efficiency of the unit in
some situations or in ambient conditions of low air temperature; as a result, the chiller or heat pump will reach the desired temperature as quickly as
possible.
The units come out of the factory with the desuperheater - DS set in the "ECONOMY" mode. The change of mode can be done by contacting the
HITECSA service.
DS
Produced hot water temperature 45÷70°C (*) with admitted water temperature differential 5÷10 K
The minimum inlet water temperature tuc (°C) admitted is equal to 40°C
N.B.:
(*) the production of water above 60°C refers to the outdoor air temperature conditions  30°C.
The activation of the external pump (supplied by the customer) for the circulation of water in the superheater occurs only if the condensation pressure
exceeds a pre-set value (20 bar). For this reason, the delays between the ignition of the unit and the ignition of the circulation pump of the
desuperheater that can be observed during operation are completely regular.
If the unit is fitted with the RC100 total heat recovery accessory the operating limit will be as follows when the recovery is active:
tuc (°C)
55
50
45
40
24
5 10 15 18
tue (°C)
Tue (°C) = Evaporator chilled outlet water temperature
Tuc (°C) = Hot water temperature leaving the recovery unit
RC100
The minimum inlet water temperature tuc (°C) admitted is equal to 20°C
NOTE
If the inlet temperature to the recovery unit is lower than the permitted values, it is recommended to use a three-way modulating valve to guarantee the
minimum water temperature required.
Permitted temperature differentials through the heat exchangers
○ Temperature differential at the evaporator AT = 3 ÷ 8°C for "Standard" machines. However, consider the minimum and maximum flow rates reported
in the tables "Water flow rate limits". The maximum and minimum temperature differentials for "Pump" and "Tank&Pump" set-ups are related to the
performance of the pumps, which must always be checked by means of the HITECSA selection software.
I.3.3

EVAPORATOR WATER FLOW RATE LIMITS

CHILLER
Type of heat
Plates
exchanger
Min
m 3 /h
2,0
120
125 m 3 /h 2,8
m 3 /h 2,8
130
138 m 3 /h 4,0
m 3 /h 4,0
146
154 m 3 /h 5,7
m 3 /h 7,2
262
IOM_EWMIM-EWMIMH_120a262_207984_200601_ES-EN-FR-DE-IT
HEAT PUMP
Type of heat
exchanger
Max
m 3 /h
10,0
120
10,0 125 m 3 /h
10,0 m 3 /h
130
m 3 /h
16,0
138
16,0 m 3 /h
146
22,0 154 m 3 /h
22,0 m 3 /h
262
Plates
Min Max
2,0 10,0
2,8 10,0
2,8 10,0
4,0 16,0
4,0 16,0
5,7 22,0
7,2 22,0
50
ADVANCE
I.3.4 RECOVERY WATER
FLOW RATE LIMITS
Type of heat
RC100
exchanger
Min
m 3 /h
4,0
138
146 m 3 /h 4,0
m 3 /h 5,7
154
262 m 3 /h 7,2
Max
16,0
16,0
22,0
22,0