Marstair 929 Series User manual

1
TECHNICAL MANUAL
FOR CD3 (929 SERIES) CHILLED WATER CLOSE CONTROL UNITS
This manual covers installation and technical aspects of TEV Ltd. CD3 range (929 series) of close control units.
INDEX
GENERAL Introduction 2
General description and part numbers
- CW upflow/downflow configurable 2
CD3 Configurable options 2
Dimensions and weights 4
SELECTION Performance data CW 4
Airflows 4
Sound levels 5
INSTALLATION Airflow options 5
Unit mounting - Upflow 6
- Downflow 7
Pipe sizes 7
Electrical connections 8
APPLICATION Electrical data 8
Fuses 9
Condensate drain 9
WIRING DIAGRAMS Power diagram 10
Controls diagram 11
OPERATION and Fan speed controller 12
COMMISSIONING Condensate pump (optional) 12
Humidifier 12
pCONet Parameters 15
Microprocessor controller 19
COMPONENT Exploded views of units with 28
IDENTIFICATION component identification
TEV Ltd.
Armytage Road, Brighouse,
West Yorkshire. HD6 1QF.
Tel: [phone]
Fax: [phone]
e-mail: [e-mail] 92908133-09

2
INTRODUCTION
The standard air handler units in the CD3 Chilled Water range are available as Configured units in upflow and downflow
versions. All units are electronically controlled.
Options can provide the close control of temperature and humidity demanded by computer rooms, laboratories, banks,
offices etc..
CD3-RANGE - GENERAL DESCRIPTION
CW UPFLOW/DOWNFLOW CONFIGURABLE* -- electronic (microprocessor) controls
CUSTOMER CONFIGURABLE
MODEL
8
10
15
20
UPFLOW
92917001
92917002
92917003
92917004
DOWNFLOW
92917005
92917006
92917007
92917008
CHILLED WATER ELECTRONIC CONFIGURABLE UNIT FEATURES:
* 4 capacity sizes in 3 cabinets * Upflow and downflow systems available
* Class 'O' thermal and acoustic insulation * Electronic (microprocessor) controls
* Washable filters * Electronically controlled fan speeds
* Discharge plenum (Upflow only) * Switches: Off/standby, unit run
* Display giving access to set points and alarms * Alarms: humidity/temperature out of limits
Each unit is controlled using a programmable microprocessor controller, providing the versatility of control
needed to meet the demand of the market place; from
CD3 CONFIGURABLE ACCESSORIES
DESCRIPTION
MODEL
Field Fit Kit
Part Number
Factory Fitted Option
Part Number
CONTROLS
Electronic Humidity Only Control (and bottle change indication)
ALL
92900405
Hum and Dehum Control (and bottle change indication)
ALL
92900418
Dehum Control (No Humidifier)
ALL
92900416
pCONET BMS BACnet Control
ALL
92919134
92919133
USB to RS485 Connector
ALL
92919136
ALARMS
1 High water level
ALL
92900412
2 Water spillage
ALL
92900411
3 Fan failure
ALL
92900408
Dirty filter indication
ALL
92900409
Dirty filter indication - volt free relay
ALL
92900621
Hum bottle change indication - volt free relay
ALL
92900622
CHILLED WATER VALVES
2 way motorised
008, 010, 015
92911028
92900428
20
92911029
92900429
3 way motorised
008, 010, 015
92911030
92900430
20
92911031
92900431
Modulating 3 port valve
008, 010, 015
92911092
92900492
20
92911093
92900493
ELECTRIC HEATERS - SINGLE STAGE
For 2 stage heaters add kits together , e.g.: 8kW + 6kW = 14kW
Max. heater loads: 008 = 8kW, 010 = 10kW,
015 = 16kW, 020 = 20kW
2 kW
92900451
4 kW
92900452
6 kW
92900453
8 kW
92900454
10kW
92900455
HEATER RAIL
(must be used with electric heaters on all units)
008U
92919021
010U, 015U
92919022
020U
92919023
008D
92900464
010D, 015D
92900465
020D
92900466

3
DESCRIPTION
MODEL
Field Fit Kit
Part Number
Factory Fitted
Option
Part Number
LPHW COIL 7.52kW
10.50kW
14.94kW
18.40kW
008 U/D
92900423
010 U/D
92900424
015 U/D
92900424
020 U/D
92900425
LPHW VALVE 2 WAY
(motorised) 3 WAY
ALL
92900426
ALL
92900427
HUMIDIFIER 0-4kg/h
(For hum and dehum controls see next page)
008U
92900444
010U, 015U
92900445
020U
92900446
008D
92900447
010D, 015D
92900448
020D
92900449
CONDENSATE PUMP (alarm interface fitted)
ALL
92900402
FRESH AIR SPIGOT 100mm dia
ALL
92900462
FRESH AIR SPIGOT 160mm dia
ALL
92900463
FRESH AIR FAN AND FILTER93m3/h
ALL
92900403
FRESH AIR FAN AND FILTER 186m3/h
ALL
92900404
TOP DUCTED DISCHARGE SPIGOT
(when used as return air spigot on downflow units a plenum is
required for access to disposable filters).
8
92900459
010, 015
92900460
20
92900461
SOUND ATTENUATION SECTION
008 U
92900475
010U, 015U
92900476
020U
92900477
FLOOR STAND PLINTH
75mm high
(Recommended for use with all floor standing units and for side entry
of services)
008U
92900432
010U, 015U
92900433
020U
92900434
008D
92900435
010D, 015D
92900436
020D
92900437
DOWNFLOW PLINTH Front discharge
008D
92900481
300mm high Front discharge
010D, 015D
92900482
Front discharge
020D
92900483
Rear discharge
008D
92900484
Rear discharge
010D, 015D
92900485
Rear discharge
020D
92900486
DOUBLE DEFLECTION GRILLE
(Upflow only)
008U
92900494
010U, 015U
92900495
020U
92900496
DISPOSABLE FILTER 50mm
(Replaces washable filter)
008U
92900438
010U, 015U
92900439
020U
92900440
008D
92900441
010D, 015D
92900442
020D
92900443
HIGH EFFICIENCY FILTERS 100mm
(Includes additional plenum section)
008U/D
92900478
010U/D, 015U/D
92900479
020U/D
92900480
ISOLATOR 63A
008U/D
92900456
010U/D, 015U/D
92900457
020U/D
92900458
U = UPFLOW D = DOWNFLOW

4
CD3 UNITS DIMENSIONS AND WEIGHTS (no plenums fitted)
UNPACKED
PACKED
Model
CD3
CD3
8
10
15
20
8
10
15
20
HEIGHT mm
1165
1165
1165
1165
1300
1300
1300
1300
WIDTH mm
1230
1380
1380
1580
1250
1400
1400
1600
DEPTH mm
430
430
430
430
455
455
455
455
WEIGHT kg
124
142
151
160
141
160
169
184
PRODUCT SELECTION
CHILLED WATER PERFORMANCE DATA
MODEL
008
010
015
020
AIRFLOW (max) m3/s
0.78
1.04
1.23
1.51
NOMINAL COOLING CAPACITIES CHILLED WATER 5C - 10.5C
22C 50% RH
TOTAL
8.75
12.40
16.81
22.06
SENS
8.33
11.34
14.84
18.87
24C 50% RH
TOTAL
12.19
16.48
22.11
28.25
SENS
9.77
13.03
17.05
21.43
26C 50% RH
TOTAL
15.57
20.57
27.45
34.62
SENS
11.07
14.60
19.09
23.85
NOMINAL COOLING CAPACITIES CHILLED WATER 6C - 11C
22C 50% RH
TOTAL
8.19
11.49
15.59
20.37
SENS
8.09
10.95
14.31
18.12
24C 50% RH
TOTAL
11.56
15.51
20.82
26.48
SENS
9.50
12.62
16.49
20.66
26C 50% RH
TOTAL
14.88
19.54
26.07
32.84
SENS
10.78
14.16
18.50
23.08
NOMINAL COOLING CAPACITIES CHILLED WATER 7C - 12.5C
22C 50% RH
TOTAL
6.80
9.50
12.49
16.17
SENS
6.80
9.50
12.49
16.17
24C 50% RH
TOTAL
9.01
12.62
17.13
22.36
SENS
8.45
11.42
14.94
18.90
26C 50% RH
TOTAL
12.54
16.83
22.60
28.75
SENS
9.83
13.05
17.06
21.36
NOMINAL COOLING CAPACITIES CHILLED WATER 9C –14.5C
22C 50% RH
TOTAL
5.07
7.48
9.86
13.03
SENS
5.07
7.48
9.86
13.03
24C 50% RH
TOTAL
6.95
9.61
12.64
16.28
SENS
6.95
9.61
12.64
16.28
26C 50% RH
TOTAL
9.24
12.81
17.42
22.63
SENS
8.55
11.48
15.00
18.91
AIRFLOWS (m³/s)
CD3
008
010
015
020
Min
Max
Min
Max
Min
Max
Min
Max
0.42
0.78
0.67
1.04
0.72
1.23
0.92
1.51
Maximum external resistance = 150 Pa at Maximum air volume

5
SOUND PRESSURE LEVELS -- CD3 UNITS
UPFLOW
FAN SPEED
8
10
15
20
Top Discharge and
Front Return
High
NC
59
60
58
61
dBA
66.5
67
65
68
Front Discharge
with Plenum and
Front Return
High
NC
49
49
48
50
dBA
58.5
58.5
57
58
Front Discharge
and Front Return
High
NC
60
58
58
60
dBA
67
65
65
65
DOWNFLOW
FAN SPEED
Standard
High
NC
44
45
45
48
dBA
53
54
54
56
CD3 AIRFLOW OPTIONS

6
CD3 SERIES CLOSE CONTROL UNIT INSTALLATION
An envelope containing important user information is supplied with the indoor unit. Please pass this to the end user.
1The standard unit is supplied configured for the correct airflow as ordered by the customer.
2The central panel, with control panel inset, MUST be removed first using the two keys provided.
UNIT ACCESS AND CABINET STRIP DOWN
1If a door interlock isolator is fitted, ensure that the switch is turned to the OFF position.
2Using the keys provided, unlock the electrics access panel. Remove the panel by easing outwards and down.
3The side panels can be removed by releasing the two swell latches located through the side bulkheads within
the electrics compartment and carefully pulling outwards until they are clear of the upper and lower grabber
catches.
4Access to the fan section, (and coil section in the downflow mode), can be gained by releasing the appropriate
swell latches located through the cut outs to the front of the side bulkheads and removing the panel.
5The return air grille can be removed by turning the 4 retaining screws anticlockwise until a click is heard and
pulling the grille outwards.
MOUNTING
1It is recommended that ALL field fit kits be installed prior to mounting the unit and brazing the pipe work.
2Ensure that the wall or floor will accept the operating weight of the unit ;the weights shown below include the
plenum.
Model
8
10
15
20
Weight (kg)
144
165
165
187
NOTE:-When wall mounting, the unit should be lifted into position using the pallet provided.
3Mark off the mounting holes as shown and drill holes to suit M6 Rawlbolt shields or equivalent fasteners.
UPFLOW SERVICE AND FIXING HOLE CENTRES (excluding discharge plenum)
N
Note: Plenum not shown is 430mm high
UNIT SIZE
DIMENSION 'A'
DIMENSION 'B'
008
1230
-
010 / 015
1380
690
020
1580
790
COIL SECTION

7
DOWNFLOW SERVICE AND FIXING HOLE CENTRES
UNIT
DIMENSION 'A'
DIMENSION 'B'
008
1230
--
010/015
1380
690
020
1580
790
4If a fresh air facility is required, apertures must be prepared as shown above/opposite. This must be suitably lined
and screened on the internal wall to prevent brick dust entering the unit.
5Mount the unit and secure the fixings.
6Check that the unit is square and level, (failure to do so will result in misalignment of the cabinet panels).
PIPE CONNECTIONS
CD
3
CW inlet & outlet (mm)
LPHW inlet & outlet (mm)
Condensate connection (mm)
008
22
15
15
010
22
15
15
015
28
15
15
020
28
15
15

8
ELECTRICAL CONNECTIONS
The installation wiring should be carried out in accordance with I.E.E. regulations and/or local codes.
A mains isolator should be used and the system suitably fused, (see page 24).
Supply cables and connecting cables are provided by the installer.
INDOOR UNIT WIRING
Connections for internal wiring are made within the electrics enclosure accessed by removing thecentre front cover. When
removing the cover disconnect the connecting cable from the display panel before moving the cover away from the unit.
Mains cables should be connected via a fused switch and routed through knockouts in the bottom left hand corner of the
unit, then through an access hole in the bottom left hand side of the electrics compartment to the mains terminal block.
The earth wire is connected toan earth stud at the right hand side of the mains terminal block. All mains and interconnecting
cable must be sized to suit the electrical rating of the unit and the length of cable run.
Make sure that all connections are secure and all wires are clear of any rotating parts.
ELECTRICAL DATA
1 Ph 230V 50Hz
3 Ph 400V 50Hz
CD3
Full Load Amps
Full Load Amps
Cooling Only
Cooling Only
Cool & Heat
Cool/Heat/Hum/Dehum
Amps
A/PH
A/PH
A/PH
008
5.4
5.4
16.7
32.7
010
7.4
7.4
17.7
32.7
015
9
9
26.0
41.0
020
9.4
9.4
33.3
49.3
The 3 ph unit loads are based on maximum heating capacities, in 2 stages, which are:-
CD3 08 = 8kW (2x4) CD3 10 = 10kW (6+4) CD3 15 = 16kW (2x8) CD3 20 = 20kW (2x10)

9
CURRENT RATINGS
CD3 HEATING (1 PHASE)
TOTAL
HEATING
LOAD
CURRENT
RATING
(Amps)
UNIT SIZE
8
10
15
20
1 STAGE
2 STAGE
1 STAGE
2 STAGE
1 STAGE
2 STAGE
1 STAGE
2 STAGE
2kW
8.3
O
O
O
O
4kW
16.7
O
O (2+2)
O
O (2+2)
O
O (2+2)
O
O (2+2)
6kW
25
O
O (4+2)
O
O (4+2)
O
O (4+2)
O
O (4+2)
8kW
33.3
O
O (4+4)
O
O (4+4)
O
O (4+4)
O
O (4+4)
CD3 HEATING (3 PHASE)
1 STAGE
2 STAGE
TOTAL
HEATING
LOAD
CURRENT
RATING
AMPS/PHASE
UNIT SIZE
TOTAL
HEATING
LOAD
CURRENT RATING
AMPS/PHASE
UNIT SIZE
L1
L2
L3
8
10
15
20
L1
L2
L3
8
10
15
20
2kW
-
-
8.3
O
O
O
O
-
-
-
-
-
-
-
-
4kW
-
8.3
8.3
O
O
O
O
4kW (2+2)
8.3
-
8.3
O
O
O
O
6kW
8.3
8.3
8.3
O
O
O
O
6kW (4+2)
8.3
8.3
8.3
O
O
O
O
8kW
8.3
8.3
16.
7
O
O
O
O
8kW (4+4)
8.3
8.3
16.7
O
O
O
O
10kW
16.
7
8.3
16.
7
-
O
O
O
10kW (6+4)
16.7
8.3
16.7
-
O
O
O
O= HEATING OPTIONS
Note: If non-standard 2 stage heating
arrangements have been fitted to order, check the
wiring diagram provided with the unit before
calculating current ratings.
12kW (6+6)
16.7
16.7
16.7
-
-
O
O
14kW (8+6)
16.7
16.7
25.0
-
-
O
O
16kW (8+8)
25.0
16.7
25.0
-
-
O
O
18kW (10+8)
25.0
25.0
25.0
-
-
-
O
20kW (10+10)
25.0
25.0
33.3
-
-
-
O
CD3 FANS
UNIT SIZE
8
10
15
20
RUNNING CURRENT
4.4A
6.4A
8.0A
8.4A
NUMBER OF FANS
1
2
2
2
POWER RATING
550W
370W
330W
550W
CONTROL CIRCUIT
2A
HUMIDIFIER
16A
FUSES
The system and its supply/interconnecting wiring must be protected by fuses, preferably H.R.C. motor rated types to
EN60269 or miniature circuit breakers to EN60898 or local codes having similar time lag characteristics that allow
starting of the compressor yet still afford close over-current protection under running conditions. The ratings below are
for H.R.C. motor rated or semi-enclosed wire fuses.
Air Handler
CW 08
CW 10
CW 15
CW 20
1 Phase
10
16
16
16
3 Phase
10
16
16
16
Fuse ratings are for cool only units. For other variants use the electrical tables to calculate fuse sizes.
CONDENSATE DRAIN
The condensate drain connection is at the left hand end of the condensate drain tray.
A 15mm O.D. copper drain stub is provided in the drain sump for connection with non-kink plastic tubing secured with
a suitable clip.
Should it be necessary for the drain tube to go through the back or base of the unit, use the knockouts provided.
The drain line must have a constant fall to open drain using a 'U' trap if required. Check that the water will run freely
and that there are no leaks.
IMPORTANT: If a humidifier is fitted the drain tube must be capable of carrying water at 60°C.
WHEN INSTALLATION HAS BEEN COMPLETED - CHECK:-
1All pipe work and joints for leakage.
2All pipe work and fittings for insulation.
3All bolts are secure and that fan rotates freely.

10
POWER WIRING DIAGRAM

11
CONTROL WIRING DIAGRAM
For HUMIDIFIER wiring diagram see page 13.

12
FAN SPEED CONTROLLER
One control is used on eachCD3 unit, and has a switch for selecting high or boost speed (see diagram below).
These can only be selected if the Pico Controller is set at low.
SETTING
The boost speed should be selected for:-
ALL DOWNFLOW units
Upflow units requiring ductwork on the supply or return air
When high efficiency filters are fitted.
The High speed should be selected for standard 'Free Blow' Upflow units.
Units are despatched with the low speed set on 50%. The speed can be increased by turning the low speed
potentiometer clockwise. The fan speed is adjustable between 50% and 100% of the selected top speed.
CONDENSATE PUMP (OPTIONAL)
An optional condensate pump is available, providing a 5m lift where gravity drain is not an option.
The full assembly comprises a condensate pump(suitable for hot and cold water removal) a control board,
a float switch to activate the pump and a high level alarm. The high level alarm disables cooling until the
condensate in the tray has fallen to a safe level.
WATER SPILL SENSOR (OPTION)
Can be connected to the condensate pump board providing an alarm in the event of condensate spillage.
CD3 SYSTEM HUMIDIFIER (OPTIONAL)
Pico Controller *
Setting
High/Boost Switch
Potentiometer
Unit Fan Speed
High
No Adjustment
Possible
No Adjustment
Possible
Unit Fan Speed
Low
Select High or
Boost
Adjust for
De-Hum Low SP
50% to 100%
*See Page 4 of 92908131 Operator Instructions if the Pico
Controller is set at high. Low speed will automatically be
selected during de-hum

13
DESCRIPTION
The humidifier is an electrode steam boiler, electronically controlled. The steam bottle requires changing
periodically. The humidifier is fitted with a bottle change indication and the frequency of change is dependent upon
the condition of the water feeding the humidifier.
INSTALLATION
Water supply
The humidifier operates with a range of water qualities; pre-treated water is preferable to extend the bottle life (it is
not suitable for use with fully de-mineralised water). The humidifier system incorporates an air break in the water
feed to meet local regulations. Connect directly to water supplies operating at pressures between 0.1 and 1 MPa
(14 to 145 psig). For supplies at higher pressures fit a pressure regulator set at 0.4 to 0.6 MPa (60 to 90 psig).
Plumbing connections
The inlet connection is a 15mm pipe. A stop valve and strainer should be fitted ahead of the control solenoid valve,
which is fitted to the inlet of the humidifier.
Waste water is drained into the unit condensate tray. The drain tube should be suitable for use with water at 60C.
Drainpipes should be correctly sized with a minimum slope of 5% (1 in 20) and an air break at the entry.
HUMIDIFIER WIRING DIAGRAM
Setting the capacity limitation “Sx%”
Use the potentiometer “Sx%” to set the capacity limitation in % of the minimum capacity (setting range: 25…100%,
factory setting: 100%).
Setting the humidity setpoint value “%rH”
Use the potentiometer “%rH” to set the humidity setpoint value for the internal controller in % relative humidity (setting
range: 0…100%, factory setting: 100%).
General Settings
With the jumpers on the jumper blocs “JP1” and “JP2” you can set different unit parameters.

14
Jumper Positions
POS
With Jumper
Without Jumper
Fi
Connection to a mains supply with ground fault
circuit interrupter
Connection to a mains supply without ground fault
circuit interrupter *
DRN
Increased drain operation factor
Regular drain operation factor *
CDY
Low water conductivity (<125 µS/cm)
Normal water conductivity (≤125 µS/cm) *
DSP
Exchangeable steam cylinder *
Cleanable steam cylinder
K
Fault No.4 “steam cylinder maintenance due”: the
unit triggers a warning only *
Fault No.4 “steam cylinder maintenance due”: 72
hours after the warning an error is triggered and the
unit is switched off
L
Fault No.3 “Fill time”: a warning is triggered after
20 minutes filling time exceeded. After 220
minutes filling time exceedance an error is
triggered and the unit is switched off *
Fault No.3 “Fill time”: the unit directly triggers an error
after 20 minutes filling time exceedance. However,
the unit is switched off after 220 minutes filling time
exceedance.
Z, M, N
No function (spare)
*Factory settings
COMMISSIONING
Pre-start check
Ensure the drain line is connected and that water flows away freely. Do this by filling and draining the bottle using the
manual drain switch.
HUMIDIFIER START UP
On initial start up the feed valve will open to fill the bottle and the drain valve will remain closed.
The initial current draw will be below the normal operating level as the bottle is filled with fresh water. This will
increase as the humidifier continues to operate until reaching its full value (this may take several operations
depending upon the condition of the water and the length of time it is operating). The bottle will continue to fill and
drain automatically on demand.
During the start up period, whenever the current is less than 70% of the set operating level, the 'bottle change’
indication will be active. This is normal and the indication will go off once the current has risen above 70% of the set
output. The 'bottle change' indication will not appear again until the bottle requires changing.
NOTE: The start up process described above occurs only when a new bottle has been fitted.
Adding a teaspoon of table salt into a new bottle can reduce the length of the start up period.
NORMAL OPERATION
After the start up period, the unit will operate automatically, at a constant output until the bottle requires changing.
The frequency of the drain and fill sequence will depend upon the quality of the water.
There will be a short delay from the unit receiving a humidifier onsignal and the steam being generated as the water
is brought up to temperature.
HUMIDIFIER MAINTENANCE
Prior to carrying out maintenance on the humidifier, the cylinder should be drained by operating the manual switch.
The system should also be isolated from the electrical supply.
STEAM BOTTLE REPLACEMENT
Access to the bottle and solenoid valves is from the front and left hand side of the unit.
1. Before switching off the power to thehumidifier, isolate the water supply and drain the bottle using themanual
drain switch.
2. Remove the discharge hose from the top of the bottle.
3. Remove the electrical connectors pulling upwards.
4. Lift the bottle support bracket clear of the outlet spigot.
5. Remove and replace the bottle.
6. Replace the hose and electrical connectors.
7. When replacing the bottle clean the feed/drain manifold and check the "O" ring seal, replacing if necessary.
Check and clean the strainer protecting the outlet solenoid valve
8. Reconnect the water supply and switch on the electrical supply.
After replacing the bottle check that the operating current is correct (see start up).

15
SETTINGS
CONFIGURATION
pCONET BMS CONTROL KIT 92919134
ENSURE THE ELECTRICAL SUPPLY IS DISCONNECTED
1. If a door interlock isolator is fitted, ensure that the switch is turned to the OFF position.
2. Using the keys provided, unlock the electrics access panel. Remove the panel by easing outwards
and down, before fully removing the panel, release the cable from the keypad.
3. Remove the “Serial card” cover from the pCO3, insert pCO net into the plug in connector and make
sure it is fully inserted.
4. Insert the required Jumper (see Carel pCO net instruction supplied for more information)
5. Fit the cover supplied with pCO net
The pCO3 has been configured for the BACnet MS/TP network as from January 2016
Comm. Speed 19200 bps (RS485)
NOTE: For CD3 systems supplied before January 2016 contact Marstair for further assistance.
Procedure for configuring the pCOnet parameters for correct communication over an MS/TP network
Connect pCOnet via RS485 to a computer: during configuration, the CAREL RS485 converter
(CVSTDMOR0) for USB ports can be used, Marstair part number 92919136. USB converters should
not be used in the installation due to the large volume of data transmitted across a complex BACnet
network.
Install the CAREL ”BACset” configuration tool, available free of charge at ksa.carel.com. You need to
create a free of charge account to access the software download sections. Navigate through the
following menu’s:-
Software and support
pCONet
BacSet.
DATABASE OF THE SUPERVISOR
The variables reported below will be transmitted between pCO and supervisor only if all the following conditions will be
met:
- the serial card is inserted into the proper connector that is found on the interface
- the supervisory function is enabled in the M_MANUF_CONF1.window protected by manufacturer’s password
-the address of the unit is properly selected with reference to the supervisory network in the
M_PARAM_USER12 window protected by user password.
- the equipments have been correctly connected to the network (supervisor and pCO)

16
Digital Variables
Address
Description
Type
Communication type
1
Compressor 1 general alarm digital input
Digital
Reading
2
Compressor 2 general alarm digital input
Digital
Reading
8
ON/OFF remote
Digital
Reading
11
fire / smoke alarm digital input
Digital
Reading
12
Dehumidification
Digital
Reading
13
ON /OFF unit
Digital
Reading
18
3p cold valve opening contact (CW) / Cooling 1 DX
Digital
Reading
19
3p cold valve closing contact (CW) / Cooling 2 DX
Digital
Reading
20
3p warm valve opening contact (CW) / Electric Heating
Digital
Reading
21
3p warm valve closing contact (CW)
Digital
Reading
22
General alarm
Digital
Reading
23
Compressor 1 general alarm
Digital
Reading
24
Compressor 2 general alarm
Digital
Reading
31
Fire / smoke alarm
Digital
Reading
32
Air filter alarm / Filter Clog
Digital
Reading
33
Ambient high temperature alarm
Digital
Reading
34
Ambient temperature alarm
Digital
Reading
35
Ambient high humidity alarm
Digital
Reading
36
Ambient low humidity alarm
Digital
Reading
55
Humidity probe enabling
Digital
Writing / Reading
58
Inlet water probe enabling
Digital
Writing / Reading
61
Cold modulating valve 0/10V enabling
Digital
Writing / Reading
63
Enabling of simultaneous operation of compressors with
0/10V valve
Digital
Writing / Reading
64
Warm 0/10V modulating valve enabling
Digital
Writing / Reading
66
Compressor rotation enabling
Digital
Writing / Reading
67
Compressor 1dehumidification enabling
Digital
Reading
68
Compressor 2 dehumidification enabling
Digital
Reading
73
ON/OFF from supervisor enabling
Digital
Writing / Reading
74
3p cold valve enabling
Digital
Reading
75
3p warm valve enabling
Digital
Reading
Whole Variables
Address
Description
Type
Communication type
01
Delay common alarm relay
Whole
Writing / Reading
10
Cold 0/10V valve ramp start
Whole
Writing / Reading
11
Cold 0/10V valve ramp end
Whole
Writing / Reading
12
Warm 0/10V valve ramp start
Whole
Writing / Reading
13
Warm 0/10V valve ramp end
Whole
Writing / Reading
16
Compressor 1 step without energy saving
Whole
Writing / Reading
17
Compressor 1 hysteresis without energy saving
Whole
Writing / Reading
18
Compressor 2 step without energy saving
Whole
Writing / Reading
19
Compressor 2 hysteresis without energy saving
Whole
Writing / Reading
26
Time interval between same compressor switching on
Whole
Writing / Reading
28
Low pressure delay alarm
Whole
Writing / Reading
29
Stop minimum time compressors
Whole
Writing / Reading
30
Time interval between different compressor switching on
Whole
Writing / Reading
33
High / low temperature / humidity alarm delay
Whole
Writing / Reading
34
Start-up delay between heaters
Whole
Writing / Reading
48
Integration time P+1 ONLY
Whole
Writing / Reading
54
Cold 3p valve ramp start
Whole
Writing / Reading
55
Cold 3p valve ramp end
Whole
Writing / Reading
56
Warm 3p valve start ramp
Whole
Writing / Reading
57
Warm 3p valve end ramp
Whole
Writing / Reading
58
3p valve complete opening time
Whole
Writing / Reading
59
Fan switching on delay
Whole
Writing / Reading
61
Cold valve ramp limit
Whole
Reading
62
Warm valve ramp limit
Whole
Reading

17
Analog Variables
Address
Description
Type
Communication type
1
Ambient temperature
Analog
Reading
2
Ambient humidity
Analog
Reading
5
Supply air temperature
Analog
Reading
6
Dead zone in temperature
Analog
Writing / Reading
7
Ambient humidity band
Analog
Writing / Reading
8
Ambient humidity set
Analog
Writing / Reading
9
Low temperature alarm offset
Analog
Writing / Reading
10
High temperature alarm offset
Analog
Writing / Reading
11
Low humidity alarm offset
Analog
Writing / Reading
12
High humidity alarm offset
Analog
Writing / Reading
13
Ambient temperature set
Analog
Writing / Reading
18
Water low temperature limit
Analog
Writing / Reading
19
Water high temperature limit
Analog
Writing / Reading
23
Cooling valve position
Analog
Reading
24
Heating valve position
Analog
Reading

18
GENERAL MAINTENANCE
12 MONTHLY (or more frequently if conditions dictate)
1. Clean the feed water strainer and drain solenoid valve. Check hoses for wear and flush out the drain tube.
2. Check all electrical connections are tight.
3. Check and clean the drain tray to prevent a build up of deposit
UNIT OPERATING INSTRUCTIONS
DESCRIPTION OF CONTROLS
All CD3 units are fitted with a microprocessor controller and a display and keypad mounted on the front of the unit,
providing the functionality necessary for all applications. Each unit is delivered tested, fully programmed and ready
to run.
The microprocessor controller provides the capability to have either stand alone, grouped or master/slave unit
configurations for both chilled water and direct expansion systems. In addition a number of alarm outputs are
available as standard.
USER INTERFACE
The user can access the controls via the panel mounted display and keypad to carry out various checks or make
alterations to the operating parameters, depending upon the access authority held by the individual. Access for the
end user, maintenance engineer and commissioning engineer is available on 3 levels:
1. FIRST USER LEVEL, not protected by password, which allows the user to view monitored items, e.g.
running hours, display active and stored alarms and select temperature and humidity set points.
2. SECOND USER LEVEL, protected by a password, that allows an authorised user to select various control
parameters including; set point limits, differentials and dead zones.
3. ENGINEERING LEVEL, protected by a password, allowing the commissioning/service/maintenance
engineers access to the time functions and hours run counters. This level also provides facilities for
calibrating the attached sensors and overriding timers during commissioning.
A fourth MANUFACTURES LEVEL, protected by password, is included for configuring and programming the
controller. This level is only available to TEV and any changes to the operating software for individual applications,
must be carried out by an TEV engineer.
PASSWORDS
A document in a sealed envelope is enclosed separately in the unit information envelope. This document
contains the passwords for the second user level and the third engineering level. This document should be
held by the installer and passed to the relevant person once the unit has been installed and commissioned.
Passwords may be altered by the user/engineer; if this happens ensure that a record of the new passwords is
kept in a safe location. Should the passwords be lost, contact TEV Ltd Technical Services Department for
assistance.
DISPLAY AND KEYPAD
A combined display and 15 button keypad is mounted on the front panel of the unit, connected to the microprocessor
controller by a 1m cable. The display is fixed to the front panel of the unit and if the panel is removed, the cable
should be disconnected before moving the panel away from the unit.
The following pages define the function keys and displays on the display and keypad and describe the procedures
for entering and changing accessible parameters during commissioning and normal operation.

19
00:00 00/00/00 Unit 1
Temperature 00.0 °C
Humidity 00.0%
Unit On
Display and keypad
KEYPAD FUNCTIONS
KEY
FUNCTION
KEY
FUNCTION
1. Displays measured
values.
2. Returns operator to the
main mask window.
Setting of operating
parameters and safety
thresholds.
Displays working hours and
allows counter re-set.
Displays the version of the
application programme loaded
into the controller.
Not used.
Unit ON/OFF button.
The green LED is lit when the
unit is ON.
Displays current status of inputs
and outputs.
1. Displays alarm status.
2. Mute and reset alarms.
Red LED lit when alarm is
present.
Allows the time clock functions
to be displayed and
programmed.
Confirms data entry.
Yellow LED is lit when there is
power to the unit.
For setting and adjusting set-
points.
1. Toggle between display
screens.
2. Raise or lower set values.
Each function button has a green LED in the top left hand corner that is lit when the particular function button is operated.
This does not apply to the ON/OFF, ALARM and ENTER buttons that have LEDs as defined above.
OPERATING SEQUENCE

20
Current time Date Mask Number
Actual Temperature
and Humidity
Unit status
When the unit is first powered up the display will show; SELF TEST - PLEASE WAIT. Once the self test has been
completed the MAIN MASK will be displayed. This is the default screen.
The default screen will always be displayed during normal operation.
To view the current operating mode of the unit:
Press or to toggle between the MAIN MASK and the WORKING MODE MASK.
SECOND USER LEVEL ACCESS (Password required)
SET BUTTON MENU
Press
To change parameters
To change screen
00:00 00/00/00 M:01
TEMPERATURE 00.0°C
HUMIDITY 00.0%
UNIT ON
WORKING MODE
COOLING HEATING
HUMID DEHUMID
FAN HIGH LOW
AUTO RESTART
ACTUAL SET POINT
TEMPERATURE 21.0°C
HUMIDITY 50%
USER PASSWORD
0000
SET POINT
TEMPERATURE 21.0°C
HUMIDITY 50%
UNIT FAN SPEED
HIGH