46
8.3 - Condenser location
All heat reclaim condensers are located between the air-cooled
condensers on the upper part of the chassis, supported by two
cross rails. The water inlet and outlet are on the same side.
8.4 -
Condensers water connections
8.4.1 -
Units with one heat reclaim condenser
Units: 30XB(E/P)ZE0200 to 400 and 30XB(E/P)ZE0900 to 1200
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 -
Units with two heat reclaim condensers
Units: 30XB(E/P)ZE0450 to 750
The two condensers must be installed in parallel in the water
system of the installation. The water flow switch and the entering/
leaving water temperature sensors must be installed in the line
that is common to both heat reclaim circuits and as close as
possible to the condensers. A T-piece must be provided by the
installer at the water inlet and outlet of the condensers.
The maximum cable length of the temperature sensors and of the
flow switch (7.5m) is designed to allow connection to the common
inlet or outlet in a radius of 4.5 m after routing along the width of
the unit.
Legend
Please refer to the legend in chapter 9.4.1 opposite, noting that items 2, 3 and 4 - flow
switch and sensors - are placed on the common sections.
8.4.3 -
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)
Please refer to the earlier chapters in this manual:
6.1 - Operating range
6.7 - Evaporator water flow rate
8.5.1 - Heat reclaim mode
Condenser Water temperatures
Minimum Maximum
Entering temperature at start-up
°C
12,5
(1)
55
Entering temperature during operation
°C
20
55
Leaving temperature during operation
°C
25
60
Evaporator Water temperatures
Minimum Maximum
Entering temperature at start-up
°C
-
45
Entering temperature during operation
°C
6,8
(2)
25
Leaving temperature during operation
°C
3,3
(2)
20
(1) The entering water temperature must not be lower than 12.5°C. For installations
with a lower temperature, a three-way valve must be used.
(2) Fresh water application
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:
20
25
30
35
40
45
50
55
60
65
-15
-10
-5
0
5
10
15
20
25
Evaporator leaving water temperature (°C)
Condenser
leaving
water
temperature
(°C)
Avec option eau
glycolée
(option 5 ou 6)
Standard (sortie d’eau >3.3°C)
Brine application
Full load
Part load approx 60%
Part load approx 30%
NOTE
-
Range is given as a guide. Check the operating range
from Carrier electronic catalogue.
Part load operating limits (evaporator leaving water
temperature = 7 °C)
40
45
50
55
60
30
40
50
60
70
80
90
100
Maximum condenser leaving
water
temperature,
°C
Unit load, %
8 - HEAT RECLAIM CONDENSER OPTIONS (OPTIONS 50 & 50C)
