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This manual provides technical and installation information for CWR 968 series CHILLED WATER CEILING
MOUNTED/RECESSED indoor units.
INDEX
GENERAL
SELECTION
UNIT
INSTALLATION
WIRING
DIAGRAMS
OPERATION
KITS
MAINTENANCE
COMPONENT
IDENTIFICATION
IMI Air Conditioning Ltd.
Armytage Road, Brighouse,
West Yorkshire. HD6 1QF
Tel: (01484) 405600
Fax: (01484) 721949
email: sales@imi-airconditioning.co.uk
Tel: 01823 665660
Heronhill - for all your Airking requirements
TECHNICAL MANUAL
for CWR CHILLED WATER
CEILING MOUNTED/RECESSED SYSTEMS.
Part numbers, dimensions and weights
Unit features/accessories
Control valves, airflows, discharge velocities
Chilled water duties
LPHW duties,
Hydraulic resistance
Optional electric heating
Sound pressure levels
Coil water volumes
CWR mounting
Pipework and electrical connections
CWR remote controller
Condensate removal, air deflection
CWR units
CWR
Remote sensor kit
Condensate pump kit
Electric heater kit
3 port diverting valve
Pipe thermostat
CWR units
Exploded view of unit with
component Identification
www.heronhill.co.uk
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A subsidiary company of IMI plc
96808003-03
Fax: 01823 665807
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Summary of Contents for IMI CWR 25
- Page 1 Exploded view of unit with IDENTIFICATION component Identification IMI Air Conditioning Ltd. Armytage Road, Brighouse, West Yorkshire. HD6 1QF Tel: (01484) 405600 Fax: (01484) 721949 A subsidiary company of IMI plc email: sales@imi-airconditioning.co.uk 96808003-03 Tel: 01823 665660 www.heronhill.co.uk Fax: 01823 665807...
- Page 2 STD = standard. NOTE:If using valves other than those specified by IMI Air Conditioning Ltd., ensure that there is electrical continuity through the valve in all positions, otherwise the indicator lights on the remote control will remain on at all times.
- Page 3 OPTIONAL CONTROL VALVES 2 port on/off valves or 3 port diverting valves are available as factory fitted options. Chilled water valves are supplied with valve drain trays. (4 port modulating valves are also available - contact IMI Air Conditioning Technical Sales Department).
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Page 4: Chilled Water Duties
Heronhill - for all your Airking requirements CHILLED WATER DUTIES (kW) CWR 25 Air Entering Dry Bulb (Wet Bulb) 21/C (15/C) 24/C (17/C) 27/C (19/C) 29/C (19/C) Air Flow m Water Water In /C Out /C DUTY 0.83 1.00 1.20 1.20... - Page 5 Heronhill - for all your Airking requirements CWR 65 Air Entering Dry Bulb (Wet Bulb) 21/C (15/C) 24/C (17/C) 27/C (19/C) 29/C (19/C) Air Flow m 1120 1120 1120 1120 Water Water In /C Out /C DUTY 2.50 2.80 3.80 3.40 3.80 5.20...
- Page 6 Heronhill - for all your Airking requirements LOW PRESSURE HOT WATER COIL DUTIES (kW) CWR 25 Air Entering, Dry Bulb 10/C 15/C 20/C 25/C Fan Speed Air Flow m Water Water Heating In /C Out /C Capacity CWR 45 Air Entering, Dry Bulb...
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Page 7: Hydraulic Resistance
Heronhill - for all your Airking requirements HYDRAULIC RESISTANCES CHILLED WATER LPHW OPTIONAL ELECTRIC HEATING (kW) 240V 50Hz 230V 50Hz 0.84 1.75 1.63 2.43 3.27 SOUND LEVELS CWR UNITS Sound Pressure Levels Sound Power Levels MODEL Speed 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz... -
Page 8: Preparation For Mounting
2 cable clamps suitable for flexible, pre-sheathed cable. Envelope containing end user operating instructions to be left with the end user. 1 Remove and discard the wooden supports (Not CWR 25). 2 Remove the cable clamps and place in a safe location until required. -
Page 9: Chassis Mounting
1 Determine the position for the unit allowing at least 450mm clearance below the air inlet. Also ensure that the position does not interfere with light fittings, sprinkler heads, etc.. 2 Identify the type of ceiling and ensure that the mounting surface will support the operating weight of the unit. MODEL CWR 25 CWR 45 CWR 65 CWR 85... - Page 10 Heronhill - for all your Airking requirements MOUNTING CENTRES 1168 1200 1070 1468 1500 3 If fitting the unit in a suspended ceiling after the ceiling has been installed, remove ceiling tiles to accept the chassis, plus adjacent tiles on each side for general access. Use the ceiling tile support rail when the unit is positioned some distance from the wall;...
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Page 11: Electrical Connections
Cable glands suitable for stranded cables are supplied and should be used to secure all cables. Installers must supply a method of securing any solid sheathed cable. FUSES (A) MODEL CWR 25 CWR 45 CWR 65 CWR 85 Without Electric... - Page 12 30/C: it is recommended that the minimum setting is kept at 17/C or above. --o--o--O--O--O--o--o-- IMI REMOTE CONTROL 97200211 (RCC 30) Using a flat-bladed screwdriver in the slot at the bottom of the casing, lever off the cover. Mount the backpanel directly to a wall or onto a plinth, using the fasteners supplied.
- Page 13 Switching differential 1K in heating mode, 0.5K in cooling mode 4K in heating mode, 2K in cooling mode Dead zone in normal operation = factory settings --o--o--O--O--O--o--o-- CWR 25 TO 85 WIRING DIAGRAM Brown Heat/heater Heater supplementary Orange Heater electric...
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Page 14: Temperature Control
Heronhill - for all your Airking requirements TEMPERATURE CONTROL The temperature range is factory set 17/C - 30/C. Turning anti-clockwise for lower room temperatures, turn clockwise for higher room temperatures. The white neon is lit when the unit is in cooling mode. The amber neon is lit when the unit is in heating mode (if heating is fitted). - Page 15 Heronhill - for all your Airking requirements REMOTE SENSOR KIT 53900428 This kit may be used on CWR models to sense the temperature at the return air grille. Item Description Electronic remote control Sensor assembly with 4m lead Retaining clip ISOLATE THE UNIT ELECTRICALLY PRIOR TO INSTALLATION OF THE KIT 1 Fit the retaining clip to the drip tray support bracket, (Fig.
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Page 16: Typical Settings
LOW SPEED COOL HEAT 10 (If an IMI Air Conditioning electromechanical controller was previously used, the connections in the original controller are numbered the same as the terminals in the CWR unit). 11 Setting instructions: The cooling differential (cool in to cool out) is fixed at 1.5C. - Page 17 Heronhill - for all your Airking requirements PROGRAMMABLE TIMER KIT 52500151 This kit can be used to give ON/OFF switching of the mains voltage control circuits of CWR units where the total current does not exceed 3 Amps. ELECTRIC HEATER CURRENTS CANNOT BE SWITCHED DIRECTLY. It is not required for 'L' products which have built in timers.
- Page 18 Heronhill - for all your Airking requirements CONDENSATE PUMP KIT 53900410 This kit is for use on 539 series IMPULSE and 968 series CWR units for the removal of condensate where gravity drain is not practicable or desirable. The pump is capable of overcoming a resistance equivalent to 5 metres lift. The sensor is arranged so that residual condensate in the sump is kept to a minimum.
- Page 19 Heronhill - for all your Airking requirements Fig. 6. Fit the loose pump grommet in the kit onto the hose (supplied as part of the unit) at the electrics end (Fig. 6). Push the hose (referred to in 7) fully onto the condensate pump outlet and secure as far onto the outlet as possible with the 4"...
- Page 20 Heronhill - for all your Airking requirements Refit the drip tray/fascia. Disconnect the gravity drain (if previously fitted) and either block off the pipe or ensure that the outlet is above the level of the drip tray by placing the pipe up behind the grille. Connect a 12mm (0.5") OD drain tube to the drain connector (Fig.
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Page 21: Troubleshooting
Heronhill - for all your Airking requirements TROUBLE SHOOTING Pump does not run Fuse on control board blown (315 mA) Sensor disconnected from control board Cooling is interrupted Restriction in pump flow allowing level to rise and trip overflow circuit Check for blockage or kink in hoses. - Page 22 Heronhill - for all your Airking requirements ELECTRIC HEATER KITS for CWR CHILLED WATER UNITS CWR MODEL KIT PART NUMBER 53900400 53900401 53900402 53900403 RATING (kW at 240V) 0.875 1.75 2.625 ITEM DESCRIPTION ITEM DESCRIPTION Heater Assembly Blue Wire Safety Cutout Relay Assembly Cutout Bracket Black Wire...
- Page 23 Heronhill - for all your Airking requirements Remove the nuts and washers from the heater element. IMPORTANT: DO NOT TOUCH THE HEATER CUTOUT BLADE. Slide the heater terminals through the electric end hanger bracket leaving the cutout assembly between the heater and the backpanel. Ensure that the elements are not crossed and the heater end is supported on the bracket.
- Page 24 Heronhill - for all your Airking requirements 3 PORT DIVERTING VALVE ASSEMBLY - CHILLED WATER 96800406 and 407 LPHW 96800415 and 417 These valves are supplied to control the flow of chilled and low pressure hot water onto CWR units. The valve by-pass port (A) is fitted with an orifice disc to minimise flow fluctuations when the unit is in dead zone and the valve goes to by-pass.
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Page 25: Maintenance
Heronhill - for all your Airking requirements PIPE THERMOSTAT KIT 96200070 This kit is for fan coils on 2 pipe systems supplied from a reverse cycle chiller (or chiller + boiler) and fitted with an auto changeover thermostat, to enable a single valve to operate in both heating and cooling modes. It prevents the room thermostat calling for cooling and the valve being opened when the flow is hot water, and vice versa. -
Page 26: Component Identification
Heronhill - for all your Airking requirements INDOOR UNIT ASSEMBLY DRAWING AND COMPONENT IDENTIFICATION Top box assembly Condensate pump sensor Side panel fixing position Fuse cover Fan motor Fuse (2A) Fascia and drip tray assembly Heater cutout assembly Fan motor capacitor Heater element Relay (only when electric heater is fitted) Chilled water coil...
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