CDA HCE340 for Manual de Serviço descarregar pdf (Página 15)

VEX340: Control system

EXact control system - List of functions for accessories

Function / component Description

Temperature sensors 1. In the supply air duct to measure/control supply air temperature

2. On the return pipe from the water heating coil to keep the heating coil warm and protect it

from icing

3. To protect external piping linked to the heating coil from icing

4. Temperature sensor on water heating coil supply pipe

Modulating motor valve Valve for variably regulating the ow of water to the cold water coil, depending of the cooiling

requirement

Circulation pump control 1. Control of the water heating coil circulation pump

2. Heat requirement function (keeps heating coil frost-free)

3. Built-in control to run the circulation pump during periods when heating is not required

Function / component Description

Temperature sensors 1. In the supply air duct to measure supply air temperature

2. In the cold water coil supply pipe

Modulating motor valve Valve for variably regulating the ow of water to the cold water coil, depending of the cooiling

requirement

Circulation pump control 1. Control of the cold water coil circulation pump

2. Built-in control to run the circulation pump during periods when cooling is not required

Function / component Description

Temperature sensors In the supply air duct to measure/control supply air temperature

Overheating protection 1. TSA60 is situated on the circuit board, trips at 60 °C and has manual reset on the HMI panel

2. TSA70 is situated in the air ow, trips at 70 °C and has automatic reset

3. TSA120 is situated in the air ow, trips at 120 °C and has manual reset i HCE and HMI

Function / component Description

Temperature sensors In the supply air duct to measure supply air temperature

Control of external cooling unit via start/stop signal and on-demand regulation 0–10 V

HCW - External water heating coil

CCW - External cold water coil

HCE - External electrical heating coil

MXCU - External cooling control

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CDA HCE340 for Manual de Serviço Página 15