EXHAUSTO 3006026 Cooling Control With Water Coil Installation Guide

EXHAUSTO 3006026 Cooling Control With Water Coil Installation Guide

Product instruction

Description of MCCW (Modbus Coil Cold Water)

Functional description

The MCCW module is able to control a water coil used for cooling. Together with the EXact2 control system, the module is able to regulate the output from the water coil. If necessary, a circulation pump can be started up.

The MCCW module can be used together with the following VEX/CX types:

• VEX100
• VEX200
• VEX320-370
• CX340-350
• VEX310T-VEX350T

Simplified diagram

The MCCW module controls a 3-way motor valve connected to a water supply. The water supply provides cold water.

Mixing loop
Constant flow in the primary circuit (Supply) and in secondary circuit (Coil Cold Water)

Explanation of simplified diagram

module, via a temperature regulator in EXact, sends an adjustable 0–10 V signal to the regulation valve (MVM). Thus the setpoint for the supply air temperature or room temperature is maintained.| Analogue output
CP| Circulation pump 1x230V
MVM| 3-way motor valve.MVM is the general term for a motor valve.
Pump ON/OFF| 230V supply to circulation pump| Analogue output
TE-SPT| Temperature sensor measures the feed temperature to the cooling coil.| Temperature input
Coil Cold Water (CCW)| Water coil (cooling)
| Line regulating valve *** When there is no cooling requirement, valve adjustment must be based on the required primary circuit water flow.
| Shut off valve

*) not EXHAUSTO delivery

Assembly and connection

Positioning and fitting of the MCCW module

Fitting the MCCW module

mounting box
2| Position the module in the vicinity of:- regulation valve and pipes
3| Position the temperature sensor in the supply air duct as shown below (Example from VEX200).

Position of temperature sensor (TE-SUPPLY

The temperature sensor is positioned here

Correct fitting of feed water temperature sensor

How to mount the temperature sensor correctly on the feed water pipe to the water coil:

strips to secure the sensor in position.

2| Ensure there is sufficient insulation around the sensor.

Cooling coil

Connection of cooling coil

The dimensioning of valves, pipes, etc. and cooling coil connection must always be carried out by authorised fitters in accordance with applicable regulations and legislation.

Mixing loop
See the simplified diagram.

Connecting an insulated CCW
With an insulated CCW, the connection must be made with stopcocks and unions, in order to allow easy release, extraction and cleaning of the coil.

Do not connect the water coil like this!.
Connection without circulation pump risks frost damage!

Bleeding
Following connection of water supply to the unit:

• Bleed the system thoroughly using the upper bleed screw on the water coil.

Insufficient bleeding
Insufficient bleeding can result in still water forming in the system, which may result in frost-induced leaks during the winter.

Fitting motor valve
The valve must not be fitted with the motor facing down.

Insulate supply pipe and water coil
The pipes and water coil must be insulated according to applicable regulations.

Frost protection
The cooling coil can be protected against frost by mixing 25% ethylene glycol. This provides frost protection down to -13°C.

MVM valve

Definition
MVM is used as a general term for a motor valve.

Shielding
Shield the valve motor from direct sunlight. Due to heat emission, the valve motor must not be encapsulated (maximum ambient temperature: 50°C).

Insulating the valve
To ensure normal operation at ambient temperatures below 0°C, it is very important that the valve section is insulated according to current standards/procedures.

MVM-OD, valve for outdoor fitting
IIf MVM-OD used, then shielding is part of the delivery – if the valve has a K vs value below 6.3.

Regulating properties
Optimal regulation is achieved when the differential pressure is between 5–20 kPa. If the differential pressure is higher than 20 kPa, the installation of a pressure difference regulator is recommended.

Cold water supply
The cold water supply must be constant.

Operation of circulating pump

The circulation pump is operated by the EXact control system, as described below:

1. When no cooling is required, the MVM valve operates at 0%.
2. The circulation pump runs for another 5 minutes and then stops.
3. EXact starts the 24-hour timer.
4. When the 24 hours have passed, the circulation pump runs for 5 minutes.
5. The exercise cycle is repeated once a day until a cooling requirement occurs.

Electrical installation

Connection diagrams for MCCW

Diagram
The following diagram shows the connection of supply voltage (1 x 230 V) and the cooling coil control box (MCCW).

Key to diagram

i.e. 0V→10V becomes 10V→0V. This is done by fitting a jumper across terminals 1 and 3 of CN12. The change will be registered the next time the unit is powered up.| EXHAUSTO
24VDC| Strip connector for continuation of 24VDC| EXHAUSTO**

Power Supply

Power Supply

Connection of Modbus devices

Diagram
Connection must be carried out according to the following diagram. Refer to the Electrical Installation Guide for the relevant VEX. (supplied with the VEX unit) for further details of how to connect standard components to the connection box.

= Skærmet kabel

*Not supplied by EXHAUSTO

MPTDUCT
HMI| Control panel

Cable (type, max. length and termination)

Cable
EXHAUSTO recommends the use of 4-core, twisted pair, shielded cable. To limit voltage drop across the cable, 0.25 diameter conductor is recommended. For correct connection of shielded cable to Modbus units, refer to the Electrical Installation Guide for the relevant VEX.

Max. cable length
The overall cable length of a complete installation may not exceed 200 m.

Modbus, termination or daisy chaining
The first and last devices on the bus must be terminated. The PCB contains a jumper JP1, which can be used for termination.

1

2

Commissioning

Commissioning

HMI panel Refer to the VEX unit HMI panel for menu items displayed during commissioning of the MCCW module.
See the following section for further information about the individual menu items or in the Exact Control System Basic Instructions for the relevant VEX.

Detection of MCCW

Menu 3.4 Accessories

• Select CCW under cooling unit in menu 3.4.
  

NB Cold recovery must be active when operating with MCCW (menu 3.1.6)

Operating readings, MCCW

Menu 2.4 Temp. reg. units

The menu will show, e.g.,

• output of cooling unit (A) and whether cooling is active = value > 0%

Menu 2.8 Cooling coil (CCW)

The menu shows:

• Supply temperature for CCW cooling coil
• Pump – if the circulation pump in the heating cycle is in operation

Forced start, MCCW (CCW)

Conditions for use To use the forced start menu, the unit must be set to OFF in the user menu (Ventilation).

Menu 8.3.3 Cooling unit

If there are no current errors for the cooling coil(“Error on unit” shown as “No”), forced start may be activated:

• Set output for CCW. The pump starts up at an output greater than 0%.

NB When Menu 8.3 “Forced start” is exited, forced start is reset and normal operation can be resumed. When a submenu is exited, the values in the submenu are reset.

Troubleshooting

HMI panel error messages

NB An error will be displayed on the HMI panel in the event of a fault or irregular operation. To resolve the problem, refer to EXact Basic instructions for the relevant VEX.

EXHAUSTO A/S
Odensevej 76
DK-5550 Langeskov

Tel. +45 65 66 12 34
Fax +45 65 66 11 10
exhausto@exhausto.dk
www.exhausto.dk

References

• Ventilationsanlæg med varmegenvinding, ventilationsløsninger af høj kvalitet til bolig, skole og kontor

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