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IMI 550 SERIES Technical Manual

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and 542 SERIES DUCTED CONDENSING UNITS
This manual provides technical and installation information for 550 series condensing units and 542 series ducted
condensing units.
INDEX
GENERAL
SELECTION
INSTALLATION
WIRING
DIAGRAMS
KITS
COMPONENT
IDENTIFICATION
IMI Air Conditioning Ltd.
Armytage Road, Brighouse,
West Yorkshire. HD6 1QF
Tel: (01484) 405600
Fax: (01484) 405620
Tel: 01823 665660
Heronhill - for all your IMI requirements
TECHNICAL MANUAL
for 550 SERIES CONDENSING UNITS
from IMI AIR CONDITIONING LTD
Specification details
Features and options
Part numbers
Dimensions and weights
MCU / MCU+ performance data
DCUE performance data
MCU / MCU+ 550 series
DCUE 542 series
Application, pipe sizing
Pipe connections
Electrical connections
Evacuating and charging
MCU
MCU+
DCUE
PTC: 1 phase units
CSR: 1 phase MCU / MCU+ 550 series
CSR: 1 phase DCUE 542 series
Head pressure control - 550 series MCU only
Compressor jacket: MCU / MCU+ 550 series
HP pressure switches MCU / MCU+
Isolator: DCUE 542 series
3 minute timer: 550 series MCU only
Wall mounting MCU / MCU+ 550 series
Wall mounting: DCUE 542 series
Overload: MCU / MCU+ 1 phase 550 series
Overload: DCUE 1 phase 542 series
Volt free relay
Duct: DCUE 542 series
Plenum: DCUE 542 series
Grille: DCUE 542 series
Exploded views of units with
component identification
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www.heronhill.co.uk
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A subsidiary company of IMI plc
55008275-03
Fax: 01823 665807

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Summary of Contents for IMI 550 SERIES

  • Page 1 Heronhill - for all your IMI requirements TECHNICAL MANUAL for 550 SERIES CONDENSING UNITS and 542 SERIES DUCTED CONDENSING UNITS from IMI AIR CONDITIONING LTD This manual provides technical and installation information for 550 series condensing units and 542 series ducted condensing units. INDEX PAGE GENERAL...

  • Page 2: Specification Details

    Heronhill - for all your IMI requirements IMI AIR CONDITIONING LIMITED - CONDENSING UNITS SPECIFICATION DETAILS MCU(+) SIZE Nominal cooling capacity ¶ 10.9 12.4 13.9 14.7 17.1 19.9 R22 Compressor - 1 Ph (230V 50Hz) Power (nominal) Starting current LRA Nominal current FLA 16.2...

  • Page 3: Features And Options

    Heronhill - for all your IMI requirements STANDARD FEATURES AND OPTIONS MCU = standard condensing unit MCU+ = standard condensing unit + head pressure control + low pressure switch DCUE = electronic controlled ducted condensing unit + head pressure control + HP and LP switches...

  • Page 4: Dimensions And Weights

    Heronhill - for all your IMI requirements UNPACKED DIMENSIONS and WEIGHTS MCU / MCU+ CONDENSING UNITS Model HEIGHT mm 1080 1080 1080 1275 1275 WIDTH mm 1000 1000 1000 1000 1000 1000 1000 1000 1100 1100 DEPTH mm 1 Ph kg...
  • Page 5 Heronhill - for all your IMI requirements MCU(+) 15 - 200 CONDENSING UNIT CAPACITIES Saturated Suction Temperature / C Air on to -2.5 MODEL Condenser Cooling capacity and power input kW Cap. Power Cap. Power Cap. Power Cap. Power Cap.
  • Page 6 Heronhill - for all your IMI requirements DCUE 15 - 80 CONDENSING UNIT CAPACITIES Saturated Suction Temperature / C Air on to -2.5 MODEL Condenser Cooling capacity and power input kW Cap. Power Cap. Power Cap. Power Cap. Power Cap.
  • Page 7 It is easier to fit kits prior to mounting the unit. These units are designed to stand on a flat surface. If the unit is to be wall mounted the following kits are available. (IMI Air Conditioning cannot accept liability for installers own mounting arrangements). Model MCU(+) 15 - 80...
  • Page 8 Heronhill - for all your IMI requirements MOUNTING: MCU(+) 130 - 200 Dimensions in mm. MODEL Weight (kg) MCU(+) 130 1000 1020 MCU(+) 150 1000 1020 1000 1020 MCU(+) 165 1100 1215 MCU(+) 180 MCU(+) 200 1100 1215 --o--o--O--O--O--o--o-- Tel: 01823 665660 www.heronhill.co.uk...
  • Page 9 Heronhill - for all your IMI requirements INSTALLING 542 SERIES DUCTED CONDENSING UNITS MOUNTING Units are supplied with a polystyrene packing piece supporting the blower assembly, this MUST be removed prior to commissioning. Ducted Units are designed to be hung on a wall (kit available), suspended from a ceiling (installer supplied fittings), or to stand on a flat surface.
  • Page 10 Heronhill - for all your IMI requirements SUSPENSION MOUNTING The installer must supply 4 x M8 threaded rods with 16 nuts and washers to suit. IMPORTANT: The stabilizing brackets provided MUST be used when suspending a unit. Fit the stabilizing brackets to the top corners of the backpanel and front face using the No. 10 screws provided, (2 per bracket).
  • Page 11 Heronhill - for all your IMI requirements APPLICATION These outdoor units are supplied fitted with an expansion device which contains a restrictor to control refrigerant flow. For use in systems which have refrigerant control at the indoor unit, remove and discard the expansion device connected to the condensing unit prior to installation.

  • Page 12: Pipe Connections

    Ensure that both service valves on the outdoor unit are closed (IN, fully clockwise) before commencing installation. IMI Air Conditioning Indoor units have a low pressure holding charge of nitrogen, which may be released into the atmosphere without damage to the environment. This should be done prior to making pipework connections.

  • Page 13: Adding Refrigerant

    Heronhill - for all your IMI requirements OUTDOOR UNIT WIRING Cable entry for the outdoor unit electrics is through the cabinet to a terminal block. MCU+, MHPUE and DCUE units are supplied wired via a head pressure controller to give maximum control. Ensure that all connections are secure and that both units are earthed.
  • Page 14 Heronhill - for all your IMI requirements WHEN INSTALLATION HAS BEEN COMPLETED - CHECK :- All pipe work and joints for leakage. DO NOT USE COLOURED OIL ADDITIVES FOR LEAK DETECTION All pipe work and fittings for insulation. All bolts are secure and that the fan rotates freely.
  • Page 15 Heronhill - for all your IMI requirements MCU(+) WIRING DIAGRAMS 1 Phase MCU+ 15 to 90 3 Phase MCU+ 30 to 100 3 Phase MCU+ 130 to 180 3 Phase MCU+ 200 -15- Tel: 01823 665660 www.heronhill.co.uk Fax: 01823 665807...

  • Page 16: Dcue

    Heronhill - for all your IMI requirements ELECTRONIC DCUE WIRING DIAGRAMS 1 Phase DCUE 10 - 60 1 Phase DCUE 80 3 Phase DCUE 30 to 80 -16- Tel: 01823 665660 www.heronhill.co.uk Fax: 01823 665807...
  • Page 17 Heronhill - for all your IMI requirements PTC COMPRESSOR START KIT 55000412 This kit is for use on single phase 550 series condensing units (MCU and MCU+) models 15 to 40 using reciprocating compressors, and all single phase 542 series ducted condensing units (DCUE).
  • Page 18 CSR COMPRESSOR START KITS FOR MCU / MCU+ 55000413 to 415 This kit may be used on single phase 550 series Condensing Units. The Capacitor Start Relay (CSR) kit is used to increase the torque to a single phase compressor, to assist those installations where the standard PSC compressor has insufficient torque.
  • Page 19 Heronhill - for all your IMI requirements CSR COMPRESSOR START KITS 54000403 to 406, 415 and 423 FOR DCUE This kit may be used on single phase 542 series ducted condensing units. The Capacitor Start Relay (CSR) kit may be used to increase the torque to a single phase compressor, to assist those installations where the 'as supplied' PSC compressor has insufficient torque.

  • Page 20: Volt Free Relay

    HEAD PRESSURE CONTROL KIT 55000487 (50Hz) and 55000496 (60Hz) This kit is for use on 550 series condensing units (MCU) to maintain a sufficiently high head pressure in cool ambient conditions by reducing the speed of the fan. This will keep the suction pressure high enough to prevent frosting of the evaporator, which might otherwise occur.
  • Page 21 Heronhill - for all your IMI requirements Remove the white wire from the fan motor capacitor and reroute to the PCBA terminal 4. (On MCU 130 - 200, move one white wire from each capacitor and use the double spade terminal).
  • Page 22 COMPRESSOR JACKET KIT 55000453 to 457 These kits are for use on 550 Series condensing units and 551 Series heat pump outdoor units to insulate the compressor and help reduce noise. It is NOT recommended for use in tropical applications.

  • Page 23: Electrical Connections

    Heronhill - for all your IMI requirements HIGH PRESSURE SWITCH KITS 55000401 & 55000402 USED ON PRESSURE SWITCH CUT OUT PRESSURE CUT IN PRESSURE 55000401 MCU(+), MHPUL HP Manual 2760kPa (400psig, 27.2 bar g) 2280kPa(330psig, 22.5 bar g) 55000402 MHPUE HP Auto 2760kPa (400psig, 27.2 bar g)
  • Page 24 Heronhill - for all your IMI requirements MCU 1Ø MCU 3Ø MCU 1Ø & MCU 3Ø with 3 min timer or LP+LP bypass timer kit fitted. Fit the timer kit before fitting the HP switch kit. Locate the in-line connector connecting the violet wires. Disconnect the violet wire connected to the timer pcb terminal 95 (LP switch) or terminal N/O (3min timer).
  • Page 25 Heronhill - for all your IMI requirements ISOLATOR KIT 54200451 This kit is for use on ALL 542 series ducted condensing units to give electrical isolation of all live or potentially live conductors within the unit. ITEM QTY DESCRIPTION Isolator...
  • Page 26 If it is desirable to lock the isolator in the 'OFF' position to deter unauthorised operation, fit a padlock through the holes provided. IMI AIR CONDITIONING DO NOT RECOMMEND THAT THE ISOLATOR IS LOCKED IN THE 'ON' POSITION. --o--o--O--O--O--o--o-- -26- Tel: 01823 665660 www.heronhill.co.uk...
  • Page 27 Heronhill - for all your IMI requirements 3 MINUTE TIMER KIT 55000493 This kit is for 550 series MCU condensing units. It provides a nominal 3 minute time delay between the compressor switching OFF and back ON. This allows system pressures to equalize and protect the compressor.
  • Page 28 Heronhill - for all your IMI requirements WALL BRACKET KIT 55021100 / 55021101 MCU(+) 15-80 MCU(+) 90-200 55021100 55021101 55021100 & 55021101 55021101 Wall Bracket Retaining bracket Bolt M8 x 25 Screw M5 x 12 Nut M8 Washer M5 Anchor bolt / nut (M10)
  • Page 29 Heronhill - for all your IMI requirements --o--o--O--O--O--o--o-- -29- Tel: 01823 665660 www.heronhill.co.uk Fax: 01823 665807...
  • Page 30 Heronhill - for all your IMI requirements DCUE WALL MOUNTING KIT 532 00 407 This kit is used to wall mount ducted condensing units. The brackets are designed to accept ONLY unit weights Item Description Item Description Item Description Wall mounting...
  • Page 31 OVERLOAD KITS FOR MCU / MCU+ 55000408 to 410, 446 and 449 These kits are for use on all single phase 550 series condensing units to provide a mains voltage alarm signal at terminal 5 when the compressor trips. They may also be used as a spares replacement.
  • Page 32 Heronhill - for all your IMI requirements DCUE OVERLOAD KITS 54000408 to 412 These kits are for use on all single phase 542 series ducted condensing units to provide an alarm signal when the compressor trips. (This signal is used to operate the alarm LED on the indoor unit). They may also be used on ALL three phase units as a spares replacement.
  • Page 33 Heronhill - for all your IMI requirements VOLT FREE RELAY KIT 55000405 This kit is for use on 550 series outdoor units and will provide a volt free alarm signal to other equipment. ITEM DESCRIPTION ITEM DESCRIPTION Relay Terminal 4 Way Screw No.
  • Page 34 Heronhill - for all your IMI requirements DCUE DUCT KIT 532 00 402 to 403. Item Description Model Kit Number 5m Duct 10 - 40 53200402 Jubilee Clip 50 - 80 53200403 Circular flexible ducting is supplied in 5 metre lengths and is of the pre-insulated type; (insulation is 40mm minimum thickness).
  • Page 35 Heronhill - for all your IMI requirements The plenums are also supplied to provide a transitional piece through a wall between ducting, (if used), and a grille. The plenum spigots are 354mm (14") diameter for models 10 to 40 and 404mm (16") diameter for models 50 to 80.
  • Page 36 Heronhill - for all your IMI requirements DCUE GRILLE KITS 53200420 and 53200421 This kit may be used on Ducted Condensing Units and Ducted Heat Pump Outdoor Units. Model Kit Number DCUE 10 - 40 53200420 DCUE 50 - 80 53200421 The grille is supplied with a flange which slots inside the plenum, (if fitted);...

  • Page 37: Component Identification

    Heronhill - for all your IMI requirements MCU(+) 15 - 100 COMPONENT IDENTIFICATION 13 Valve panel 25 End clamp Contactor Base 26 Terminal (screw - screw ) Overload 15 Mounting foot 27 Fuse Heat exchanger 16 LP switch 28 Fuse terminal...

  • Page 38: Component Identification

    Heronhill - for all your IMI requirements MCU(+) 130 - 200 COMPONENT IDENTIFICATION Rear access panel Front access panel Fuse terminal Bulkhead panel Fan guard Fuse HP switch (manual: Accessory) Fascia panel Terminal (screw - screw) Expansion assembly Corner panel...

  • Page 39: Component Identification

    Heronhill - for all your IMI requirements DCUE COMPONENT IDENTIFICATION Water level sensor Fan assembly Expansion assembly Panel right hand access Service valve Accumulator Panel electrics access Spire c lip Handle Switch LP auto Service valve Switch HP auto Isolator...

This manual is also suitable for:

542 series

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