EXHAUSTO 3006026 Cooling Control With Water Coil Installation Guide
- June 13, 2024
- EXHAUSTO
Table of Contents
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
| Term | Description | input/output |
|---|---|---|
| TE-SUPPLY | Measures air temperature after cooling coil. | Temperature input |
| Capacity 0-10V | Analogue outputs 0–10 V for setting of 0–100% cooling.The MCCW |
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
| Step | Action |
|---|---|
| 1 | Fit the module using the screw holes in each corner of the module’s |
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:
| Step | Action |
|---|---|
| 1 | Use heat paste to ensure good contact between the pipe and the sensor. Use |
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:
- When no cooling is required, the MVM valve operates at 0%.
- The circulation pump runs for another 5 minutes and then stops.
- EXact starts the 24-hour timer.
- When the 24 hours have passed, the circulation pump runs for 5 minutes.
- 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
| Term | Description | Supplied by… |
|---|---|---|
| -A1 | Voltage supply/modbus terminal in VEX | EXHAUSTO |
| -A2 | MCCW module | EXHAUSTO |
| -F1 | Distribution board fuse | Costumer25 |
| -T2 | TE-SUPPLY Supply air temperature sensor | EXHAUSTO |
| -T4 | Temperature sensor, supply | EXHAUSTO |
| -M1 | MVM Motor valve | EXHAUSTO |
| CP | Cirkulation pump | Costumer |
| -Q1 | Distribution board group switch | Costumer |
| -Q2 | Isolation switch (disconnects all poles) | Costumer |
| * | Not supplied by EXHAUSTO | Costumer |
| CN12Terminals 1 and 3 | It is possible to invert the control signal to MCCW, |
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
| VEX size | Maximum load of terminal in main board |
|---|---|
| VEX140 | 1,4A |
| VEX150-170 | 2A |
| VEX240 | 1,4A |
| VEX250-260-270-280 | 2A |
| VEX340-350-360 | 2A |
| VEX320C-330C-330H | must be separately powered |
| VEX310T-350T | 2A |
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
| MHCW/MHCE | Module for controlling heating coil (water or electric) |
|---|---|
| MXCU/MCCW | Module for control of coil with cold water supply. |
| MPT DUCT | Pressure measurement in duct |
| XXXXX | Can be different modules, e.g. MIO module or additional |
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.
| If | Then | See diagram no. |
|---|---|---|
| MCCW is the first or last device on the bus | it must be terminated by use | |
| of jumper JP1 (jumper nearest terminal 1 on CN7). | 1 | |
| MCCW is not the first and last device on the bus | it must be daisy- | |
| chained to the next device = default setting | 2 |
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
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>