Carrier 30KAV-ZE Series - Page 84

12.4.1 - Operating principle
Options 49 and 50 enable free hot water to be produced by
recovering the waste heat emitted at the compressor discharge
point
Option 49 (partial heat recovery) is designed to recover
approximately 20% of the total output discharged by the
chiller(depending on the operating conditions).
Option 50 (total heat recovery) is designed to recover approximately
95% of the total output discharged by the chiller (depending on
the operating conditions).
Both options have a plate heat exchanger installed as standard
with air-cooled condensers on the compressor discharge line on
each circuit. The ow of refrigerant still passes through the
recovery exchangers, ensuring hot water is produced once the
unit is in chilled water production mode.
For options 49 and 50, There is no isolation valve or solenoid valve
on the refrigerant circuit; hot water production is switched o󰀨 by
actuating a three-way valve and/or a variable ow pump on the
hot water hydraulic circuit. (See the control manual)
12.4.2 - Condenser hydraulic connections
The unit is delivered with two temperature sensors and a ow rate
controller which provide the regulation of the heat recovery mode.
The water ow controller must be installed on the installation's
water inlet leading to the heat recovery condensers. (The maximum
length of the temperature sensors and ow switch is 15 meters or
25 meters for units 30KAV-ZE 900 to 1300 and 30KAVIZE 1100
and 1250.)
It is recommended to position the temperature sensors and ow
switch as shown in the diagram below in order to ensure optimal
control of the hot water temperature.
Temperature sensors must be positionned in a water alimented
area in any conditions to ensure good regulation of the hot water
loop.
NOTE: The water can be regulated on the water inlet or outlet.
(See the control manual)
B
B
G
L
C
H
M
D
I
E
J
F
K
Key
Component of option 49/50
B
Heat reclaim condenser
C
Condenser water ow controller (supplied)
D
Water outlet temperature sensor (supplied)
E
Water inlet temperature sensor (supplied)
Installation components (installation example)
F
Three-way valve
G
Pump of the hot water hydraulic circuit
H
Safety valve
I
Pressure gauge
J
Expansion tank (100 °C minimum)
K
Recovery condenser water ow balancing valve
L
Border between the unit and the installation (without option 325)
M
Border between the unit and the installation (with option 325)
NOTE: For the hydraulic installation, it is recommended that
Carrier's recommendations are followed. (See chapter 8.1.
Precaution for use)
12 - OPTIONS
84