Carel pCO1 User Manual

Modular Standard HP Chiller for Carel driver
Carel code +030221236- Rel. 1.0 dated 7 July 2003
28
14 CONTROLLING UNIT RECOVERY
14.1.1 INPUTS USED
• Water T at evaporator input B1
• Water T at evaporator output B2
• Water T at recovery input
• Water T at recovery output
14.1.2 OUTPUTS USED
• Valve A
• Valve B
• Valve C
14.1.3 PARAMETERS USED
• Recovery/use priority
• Recovery set-point
• Recovery band
14.2 RECOVERY PRIORITY
14.2.1 SUMMER OPERATION
With the use temperature controller dissatisfied and the recovery temperature controller satisfied , the machine is in chiller only operating mode.
The compressors are controlled by the evaporator water temperature.
With the use temperature controller dissatisfied and the recovery temperature controller dissatisfied , the machine is in chiller + recovery
operating mode. The compressors are controlled by the recovery water temperature.
With the use temperature controller satisfied and the recovery temperature controller satisfied, the machine is in recovery only operating mode.
The compressors are controlled by the recovery water temperature.
14.2.2 WINTER OPERATION
With the use temperature controller satisfied and the recovery temperature controller satisfied , the machine is in heat pump operating mode.
The compressors are controlled by the evaporator water temperature.
With the use temperature controller dissatisfied and the recovery temperature controller dissatisfied , the machine is in recovery only operating
mode. The compressors are controlled by the recovery water temperature.
With the use temperature controller satisfied and the recovery temperature controller dissatisfied , the machine is in recovery only
operating
mode. The compressors are controlled by the recovery water temperature.
If the unit requests defrosting, the machine is in defrosting operating mode.
14.3 USE PRIORITY
14.3.1 SUMMER OPERATION
With the use temperature controller dissatisfied and the recovery temperature controller satisfied, the machine is in chiller only operating mode.
The compressors are controlled by the evaporator water temperature.
With the use temperature controller dissatisfied and the recovery temperature controller dissatisfied , the machine is in chiller + recovery
operating mode. The compressors are controlled by the evaporator water temperature.
With the use temperature controller satisfied and the recovery temperature controller satisfied , the machine is in recovery only
operating mode.
The compressors are controlled by the recovery water temperature.
14.3.2 WINTER OPERATION
With the use temperature controller satisfied and the recovery temperature controller satisfied , the machine is in heat pump operating mode.
The compressors are controlled by the evaporator water temperature.
With the use temperature controller dissatisfied and the recovery temperature controller dissatisfied , the machine is in heat pump operating
mode. The compressors are controlled by the evaporator water temperature.
With the use temperature controller satisfied and the recovery temperature controller dissatisfied , the machine is in recovery only operating
mode. The compressors are controlled by the recovery water temperature.
If the unit requests defrosting, the machine is in defrosting operating mode.
The condensation fans are ON in all operating modes with the exception of chiller + recovery and defrosting.
The different operating modes are selected by the control by means of three relays according to the following table.
Summer operation
valve A (recovery) Valve B (use) Valve C (summer/winter)
Chiller only OFF ON OFF
Chiller + recovery ON ON OFF
Recovery only ON OFF OFF
Winter operation
valve A (recovery) Valve B (use) Valve C (summer/winter)
Heat pump OFF ON ON
Recovery only ON OFF ON
Defrosting OFF OFF ON

Carel pCO1 Specifications

General

Brand	Carel
Model	pCO1
Category	Chiller
Language	English