30
HEAT PUMPS - AIR CONDITIONING - REFRIGERATION - AIR HANDLING - HEAT EXCHANGE - NA 18.752 B
Water chillers
Heat pump
HYDROCIAT LW
LW ST / HE
Minimum Maximum
Evaporator
Entering temperature at start-up
-
35.0°C
Leaving temperature during operation
3.3°C
(1)
20.0°C
Entering/leaving temperature difference at full load
2.8 K
11.1 K
Condenser
Entering temperature at start-up
13.0°C
(2)
-
Leaving temperature during operation
19.0°C
(2)
50.0°C
(3)
Entering/leaving temperature difference at full load
2.8 K
11.1 K
(1) For low-temperature applications, where the leaving water temperature
is below 3.3°C, a frost protection solution must be used. Please refer to
medium- and low- temperature brine solution option.
(2) For lower condenser temperatures, a water flow control valve must be used
at the condenser (two or three-way valve). Please refer to Control for low
condensing temperature systems option to ensure the correct condensing
temperature.
(3) Please refer to High condensing temperature option for applications with a
high condenser leaving temperature (up to 63°C).
Units with High condensing temperature
option
Minimum Maximum
LW ST / HE
Evaporator
Entering temperature at start-up
-
35.0°C
Leaving temperature during operation
3.3°C
(1)
15.0°C
Entering/leaving temperature difference at full load
2.8 K
11.1 K
Condenser
Entering temperature at start-up
13.0°C
(2)
-
Leaving temperature during operation
23.0°C
(2)
63.0°C
Entering/leaving temperature difference at full load
2.8 K
11.1 K
(1) For low-temperature applications, where the leaving water temperature is
below 3.3°C, a frost protection solution must be used. Please refer to medium-
and low- temperature brine solution option.
(2) For lower condenser temperatures, a water flow control valve must be used
at the condenser (two or three-way valve). Please refer to Control for low
condensing temperature systems option to ensure the correct condensing
temperature.
Units with medium- and low-
temperature brine options
Minimum Maximum
LW HE 1328-1528
Evaporator
Entering temperature at start-up
-
35.0°C
Leaving temperature during operation
(1)
Medium-temperature brine with ethylene glycol EG
-6°C
15.0°C
Medium-temperature brine with propylene glycol PG
-3°C
15.0°C
Low-temperature brine with ethylene glycol EG
-12°C
15.0°C
Low-temperature brine with propylene glycol PG
-8°C
15.0°C
Entering/leaving temperature difference at full load
2.8 K
11.1 K
(3)
Condenser
Entering temperature at start-up
13.0°C
(2)
-
Leaving temperature during operation
19.0/23.0°C
(2)
55.0/63.0°C
(4)
Entering/leaving temperature difference at full load
2.8 K
11.1 K
(1) The operating range with evaporator leaving temperatures above 3°C is
permitted, but the performances are not optimised.
(2) For lower condenser temperatures, a water flow control valve must be
used at the condenser (two or three-way valve). Please refer to Control
for low condensing temperature systems option to ensure the correct
condensing temperature.
(3) Please refer to the dedicated chapter of the user manual for the minimum
recommended evaporator glycol flow rate.
(4) Depends on the conditions at the evaporator and the load conditions.
o
peRating
limits
anD
opeRating
Ranges
Evaporator leaving water temperature, °C
Condenser
leaving
water temperature, °C
NOTES:
Ambient temperatures: During storage and transport of the LW units
(including by container) the minimum and maximum permissible temperatures
are -20°C and 72°C (and 65°C for Compliance with Australian regulations option).
For more precise details refer to the unit selection program.
■
Units with High condensing temperature option
■
LW ST and LW HE units
Approx. 45% at full load
Part load limit approx. 35%
Minimum load limit approx.15%
Approx. 60% at full load
Part load limit approx. 50%
Minimum load limit approx.30%
15
20
25
30
35
40
45
50
55
0
5
10
15
20
Evaporator leaving water temperature, °C
Condenser leaving water temperature, °C
■
Units with medium- and low-temperature
brine options
Operating range permitted, but performances are not optimised
Medium-temperature brine
solution option
Low-temperature brine solution
option
Full load with Medium- and Low- temperature brine solution options and ethylene
or propylene glycol
Part load limit approx. 80%
Part load limit approx. 50%
Part load limit approx. 30%
Condenser
leaving
water temperature, °C
Evaporator leaving glycol temperature, °C
15
20
25
30
35
40
45
50
55
60
65
70
-15
-10
-5
0
5
10
15
20
20
25
30
35
40
45
50
55
60
65
70
0
5
10
15
20
EG
PG
EG
PG
Summary of Contents for HYDROCIAT LW HE Series
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