Carel pCO1 series Application Program

Standard air-conditioning units
Carel Cod. +030221421 – Rel. 1.2 – April, 11, 2003
29
11.0 RECOVERY COIL
Recovery is an optional function: an additional cold coil using water coming from an external source (i.e., evaporation tower) is enabled if the
temperature of water running inside it is quite low. This allows saving on the system management costs. The coil is enabled by On-Off contact
or 0-10Volt modulating signal.
The following diagram shows the recovery coil enabling conditions: environment cooling request and recovery water temperature lower than
recovery set – recovery differential.
11.1 RECOVERY WITHOUT COOLING DEVICES
As shown in the previous diagram, the recovery coil only is enabled, whereas the conventional cooling devices are not switched on; as it can be
noted in the following diagram, the recovery coil takes up the entire cold proportional band.
Ambient
tem
p
.
(
°C
)
COOLING REQUEST
0%
Dead z.
Cold prop. band
Temperature set
23.0 23.5 26.5
0.5°C 3°C
Recovery
tem
p
.
(
°C
)
RECOVERY ENABLED
Recovery differential
Recovery set
10.0 12.0
2°C
Recovery coil
state
OFF ON OFF
Ambient
tem
p
.
(
°C
)
COOLING
HEATING
0%
100%
100%
0%
Dead z. Dead z.
Cold proportional band
Warm proportional band
Temperature set
RECOVERY ON-OFF CONTACT
19.5 22.5 23.0 23.5 26.5
23.0 23.5 26.5
3°C 0.5°C 0.5°C 3°C
0-10V RECOVERY VALVE
23.0 23.5 26.5
100%
0%
Ambient
tem
p
.
(
°C
)
Ambient
tem
p
.
(
°C
)

Carel pCO1 series Specifications

General

Brand	Carel
Model	pCO1 series
Category	Controller
Language	English