Cooling Recovery Circuit (Optional) - Carrier 30PA Installation, Operation And Maintenance Instructions

Ductable air-cooled scroll
chillers and heat pumps

Cooling recovery circuit (optional)

The system consists in a hot water supplying by an heat recovery
system on the compressor(s) discharge gas, on an auxiliary
desuperheater exchanger.
On an heat pump model, the optional desuperheater can be used
whatever the running mode, COOLING or HEATING.
This optional equipment is only available on request, and factory
mounted.
 Operating mode
The heat recovery is possible only if the unit is running, on COOLING
mode or on HEAT PUMP mode.
For the same cooling or heating capacity, the desuperheater system
allows a free heating of hot water with a reduction of the total input
power of the unit.
 Principle and precaution of hydraulic connection
In order to allow the unit to start up and to run under good conditions,
the circuit must be as short as possible, and the water fl ow of the
desuperheater must start slowly to normal operating condition, with a
water fl ow equal to 10% of its standard value, and must be calculated
for a hot water inlet temperature of +50°C.
Thus, it is recommended to have a hydraulic diagram making it possible
to obtain very quickly a hot water at the inlet of the desuperheater (3 ways
valve + controller + temperature sensor on the exchanger water inlet).
The controller set point must be adjusted to +50°C minimum.
The recovery circuit must be done in accordance with the standards
 Technical characteristics of the recovery circuit
30PA/PH/PAC/PHC

Recovery capacity (kW)
Nominal water fl ow (m /h)
3
Pressure drop (m.w.c.)
Cooling capacity (kW)
Power input (kW)
Type
Hydraulic
connections
Diameter
Type
Number
Pump
Motor output (kW)
(optional)
Max. absorbed current (A)
Avail. pressure (m.w.c.)
(max. pump speed)
Recovery circuit (kg)
Additional
weight
Pump (optional) (kg)

Capacity recovered by the desuperheater circuit for nominal conditions and recovery water at 50/60ºC.

The change of speed of the pump is made by a button that changes color according to the selected speed (blue: low; green: medium; yellow: high).
22
STD version
90STD 100STD 120STD
4,4 5,2 6,2
0,38 0,45 0,53
0,06 0,09 0,17
17,8 21,3 25,3
6,8 7,9 8,6
Threaded
1" M
Humid rotor
0,05
5,54 5,45 5,35

5,3 5,3 6,8
in force and plan all of the necessary elements in a closed circuit:
circulation pump (optionally supplied), expansion vessel, safety valve,
mesh fi lter, fi ller, drainer, bleeders, thermometers, pressure gauges and
cut-off and insulation valves.
The circulation pump can only work in a closed circuit. The command
is performed from a thermostat located on the unit.
Attention: a detailed attention must carried with the selection of the
expansion tank, because the recovery water circuit can reach the
temperature of 120°C in the event of stopping of the circulator or non
hot water consumption.
- Install heating elements on all pipes that could be exposed to freezing
temperatures.
30PA/PH
Min. 50ºC
Opcional
PLATES
EXCHARGER
THERMOMETER
MANOMETER
160STD 180STD 90HEE
8,1 8,9 4,5
0,70 0,76 0,39
0,30 0,36 0,07
33,0 36,2 18,5
6,2
10,8 12,7
1
0,4
5,15 5,07 5,52
6,8 6,8 5,3
3,2
ELECTRICAL CIRCULATOR SHUT-OFF
HEATER PUMP VA LVE
FLEXIBLE AIR BLEEDER SAFETY
CONNECTION VALVE
VA LVE
MESH EXPANSION NO RETURN -
FILTER VESSEL VALVE
HEE version
100HEE 120HEE 160HEE
5,2 6,3 7,7
0,44 0,54 0,67
0,09 0,18 0,27
21,1 25,6 31,6
7,1 7,8 10,0
Threaded
1" M
Humid rotor
1
0,05
0,4
5,46 5,34 5,19
5,3 6,8 6,8
3,2
A consumo
Agua de red
3-WAY
VALVE
CIRCUIT
FILLED
CIRCUIT
DRAINAGE
180HEE
8,8
0,76
0,35
35,8
11,9
5,07
6,8