Carrier AirStream 42WKN08-36 Installation, Operation And Maintenance Instructions
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Carrier AirStream 42WKN08-36 Installation, Operation And Maintenance Instructions

Carrier AirStream 42WKN08-36 Installation, Operation And Maintenance Instructions

Hydronic ceiling cassettes
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Installation, Operation and Maintenance
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
SPECIAL PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . 2
Special Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Précautions Particulières . . . . . . . . . . . . . . . . . . . . . . 2
Hazard Intensity Levels . . . . . . . . . . . . . . . . . . . . . . . 2
Hiérarchie Des Niveaux De Risques . . . . . . . . . . . . . 2
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CONTROLS DESCRIPTION . . . . . . . . . . . . . . . . . . . . 10
Microprocessor Control Board . . . . . . . . . . . . . . . . 10
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
External Connections . . . . . . . . . . . . . . . . . . . . . . . . 10
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Infrared Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Self Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Receiver Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PRE-INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 42
Unpack Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Blank Off Pieces . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Ceiling Opening Sizes . . . . . . . . . . . . . . . . . . . . . . . 42
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Step 1 - Hanger Bolts . . . . . . . . . . . . . . . . . . . . . . . 42
Step 2 - Installation Guide . . . . . . . . . . . . . . . . . . . 43
Step 3 - Condensate Piping . . . . . . . . . . . . . . . . . . 43
Step 4 - Duct Collars . . . . . . . . . . . . . . . . . . . . . . . . 43
Step 5 - Piping Installation . . . . . . . . . . . . . . . . . . . 44
Step 6 - Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Disconnect Switch . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Step 7 - Fascia Assembly . . . . . . . . . . . . . . . . . . . 53
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53420027-01
Instructions
Page
Printed in U.S.A.
Form 42WKN-11SI
Hydronic Ceiling Cassettes
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Pre-Start Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Control Circuit Checks . . . . . . . . . . . . . . . . . . . . . . .53
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . .55
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Fan Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Temperature Setpoint . . . . . . . . . . . . . . . . . . . . . . . .55
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Battery Replacement . . . . . . . . . . . . . . . . . . . . . . . . .55
CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Setting Jumper Links . . . . . . . . . . . . . . . . . . . . . . . .56
Main Control Functions . . . . . . . . . . . . . . . . . . . . . . .56
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . .57
Filter Removal and Cleaning . . . . . . . . . . . . . . . . . .57
Recommended Spares . . . . . . . . . . . . . . . . . . . . . . .57
DISASSEMBLY PROCEDURE . . . . . . . . . . . . . . . . . .57
Fan Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Condensate Tray Removal . . . . . . . . . . . . . . . . . . . .57
Condensate Pump Removal . . . . . . . . . . . . . . . . . . .58
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . .58
REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . .61

SAFETY CONSIDERATIONS

Installing and servicing air-conditioning equipment can be hazard-
ous due to system pressure and electrical components. Only
trained and qualified service personnel should install and service
air-conditioning equipment. See Fig. 1 for Proposition 65 warning
label. To assist in installation see Table 1 for conversion factors.
Untrained personnel can perform basic maintenance such as
cleaning and replacing filters. All other operations should be per-
formed by trained service personnel. When working on air-
conditioning equipment, observe safety precautions in literature
and on tags and labels attached to the unit.
1.
The equipment has been designed and manufactured to
meet international safety standards but, like any mechani-
Pg 1
AirStream
42WKN08-36
11-23
Replaces: 42WKN-10SI
™

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  • Page 1: Table Of Contents

    ™ AirStream 42WKN08-36 Hydronic Ceiling Cassettes Installation, Operation and Maintenance Instructions CONTENTS PRE-START-UP ......53 Pre-Start Checks .

  • Page 2: Special Precautions

    cal/electrical equipment, care must be taken to obtain the IMPORTANT: best results. • Cet appareil n’est pas conçu pour être utilisé ou entre- Service and maintenance of this equipment should only be tenu par des personnes (y compris des enfants) dont les carried out by skilled personnel.
  • Page 3 WARNING CAUTION • Disconnect power supply before making wiring con- • Units not approved for use in potable water systems. nections or working on this equipment. Follow all ap- • Hot water supplied to the hot water heating option must plicable safety procedures to prevent accidental power not exceed 200ºF (93°C) temperature or 125 PSIG up.

  • Page 4: Inspection

    Table 1 — SI (Metric) Conversion Factors IMPORTANT: • La performance de l’unité sera grandement réduite à TO CONVERT MULTIPLY BY TO OBTAIN une altitude de 7215 pieds (2200 m) et elle ne doit pas in. wc 0.24 être utilisée au-delà de cette hauteur. psig 6.893 •...
  • Page 5 Table 2 — 42WKN Physical Data — English 42WKN UNIT SIZE COOLING CAPACITY with Standard Filters BTU/hr 7,800 11,200 18,200 18,600 31,100 34,300 with MERV 10 Filters BTU/hr 5,400 6,800 16,500 16,500 29,700 29,700 CONSTRUCTION High Impact Polystyrene (Light Grey color), UL 94 VO Fire Rating Material: Fascia Galvanized Steel Material: Chassis...
  • Page 6 Table 3 — 42WKN Physical Data — SI 42WKN UNIT SIZE COOLING CAPACITY with Standard Filters 10.1 with MERV 10 Filters CONSTRUCTION Material: Fascia High Impact Polystyrene (Light Grey color), UL 94 VO Fire Rating Material: Chassis Galvanized Steel CHILLED WATER COIL Type Type Finned Tube Quantity...
  • Page 7 NOTE: Dimensions shown are inches (mm) Fig. 2 — 42WKN08 and 42WKN12 Unit Dimensions...
  • Page 8 NOTE: Dimensions shown are inches (mm) Fig. 3 — 42WKN18 and 42WKN20 Unit Dimensions...
  • Page 9 NOTE: Dimensions shown are inches (mm) Fig. 4 — 42WKN33 and 42WKN36 Unit Dimensions...

  • Page 10: Controls Description

    PCB's battery holder approximately 5 minutes before main pow- CONTROLS DESCRIPTION er is initially applied to the unit. Microprocessor Control Board Controller The PCB (printed circuit board) control board relays control the Before using the infrared transmitters, please read this handbook operation of the indoor-fan motor, outdoor-fan motor, compressor fully and ensure the batteries (supplied loose) are fitted into the and electric heater (if fitted), to maintain room conditions at a...
  • Page 11 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY STEP UP DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC TRANSFORMER SWITCH FUSE FOR AMP VALUE.
  • Page 12 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC SWITCH FUSE FOR AMP VALUE. 1.25A 208-230V / 1PH / 50-60HZ INCOMING POWER...
  • Page 13 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC SWITCH FUSE FOR AMP VALUE. 1.25A 208-230V / 1PH / 50-60HZ INCOMING POWER...
  • Page 14 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY STEP DOWN DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC TRANSFORMER SWITCH FUSE FOR AMP VALUE.
  • Page 15 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC 14 AWG BLACK SWITCH FUSE FOR AMP VALUE.
  • Page 16 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC 14 AWG BLACK SWITCH FUSE FOR AMP VALUE.
  • Page 17 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY STEP UP DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC TRANSFORMER SWITCH FUSE FOR AMP VALUE.
  • Page 18 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC SWITCH FUSE FOR AMP VALUE. 1.25A 208-230V / 1PH / 50-60HZ INCOMING POWER...
  • Page 19 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC SWITCH FUSE FOR AMP VALUE. 1.25A 208-230V / 1PH / 50-60HZ INCOMING POWER...
  • Page 20 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY STEP DOWN DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC TRANSFORMER SWITCH FUSE FOR AMP VALUE.
  • Page 21 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY STEP UP DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC TRANSFORMER SWITCH FUSE FOR AMP VALUE.
  • Page 22 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC SWITCH FUSE FOR AMP VALUE. 2.0A 208-230V / 1PH / 50-60HZ INCOMING POWER...
  • Page 23 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC SWITCH FUSE FOR AMP VALUE. 2.0A 208-230V / 1PH / 50-60HZ INCOMING POWER...
  • Page 24 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY STEP DOWN DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC TRANSFORMER SWITCH FUSE FOR AMP VALUE.
  • Page 25 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC 12 AWG BLACK SWITCH FUSE FOR AMP VALUE.
  • Page 26 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC 12 AWG BLACK SWITCH FUSE FOR AMP VALUE.
  • Page 27 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY STEP UP DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC TRANSFORMER SWITCH FUSE FOR AMP VALUE.
  • Page 28 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC SWITCH FUSE FOR AMP VALUE. 2.0A 208-230V / 1PH / 50-60HZ INCOMING POWER...
  • Page 29 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC SWITCH FUSE FOR AMP VALUE. 2.0A 208-230V / 1PH / 50-60HZ INCOMING POWER...
  • Page 30 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY STEP DOWN DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC TRANSFORMER SWITCH FUSE FOR AMP VALUE.
  • Page 31 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY STEP UP DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC TRANSFORMER SWITCH FUSE FOR AMP VALUE.
  • Page 32 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC SWITCH FUSE FOR AMP VALUE. 3.5A 208-230V / 1PH / 50-60HZ INCOMING POWER...
  • Page 33 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC SWITCH FUSE FOR AMP VALUE. 3.5A 208-230V / 1PH / 50-60HZ INCOMING POWER...
  • Page 34 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY STEP DOWN DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC TRANSFORMER SWITCH FUSE FOR AMP VALUE.
  • Page 35 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC 10 AWG BLACK SWITCH FUSE FOR AMP VALUE.
  • Page 36 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC 10 AWG BLACK SWITCH FUSE FOR AMP VALUE.
  • Page 37 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY STEP UP DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC TRANSFORMER SWITCH FUSE FOR AMP VALUE.
  • Page 38 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC SWITCH FUSE FOR AMP VALUE. 3.5A 208-230V / 1PH / 50-60HZ INCOMING POWER...
  • Page 39 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC SWITCH FUSE FOR AMP VALUE. 3.5A 208-230V / 1PH / 50-60HZ INCOMING POWER...
  • Page 40 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED NOTE: ALL FUSES ARE (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE CLASS CC TIME DELAY STEP DOWN DISCONNECT 14 AWG BLACK 600VAC. SEE SPECIFIC TRANSFORMER SWITCH FUSE FOR AMP VALUE.
  • Page 41 CLOCK TIMER SWING INDICATOR TEMPERATURE Indicates air vane operation (medium and FAN SPEED large cassette untis only) MODE INDICATOR +, — Press to adjust temperature setpoint. Press ON/SEND to send new setting to thermostat. Press to turn unit off. SELECT Press to set clock or timer.

  • Page 42: Pre-Installation

    PRE-INSTALLATION Ceiling Opening Sizes An opening in the false ceiling will then have to be cut to the size Unpack Unit shown in Table 4. Remove the banding straps and lift the cardboard lid. Remove the fascia, packed in bubble wrap, and polystyrene packing pieces to expose the unit.

  • Page 43: Step 2 - Installation Guide

    Step 2 — Installation Guide Maximum pump lift is 30 inches (76.2 cm). An installation guide is included in the Carrier Owner Information The highest point in the condensate piping should be as packet provided with the unit. Prepare the installation guide by close to the unit as possible.

  • Page 44: Installing Outside And/Or Supply Air Duct Collars

    INSTALLING OUTSIDE AND/OR SUPPLY AIR DUCT IMPORTANT: COLLARS • No water-flow can cause a freeze condition resulting in Refer to the dimensional drawings (Fig. 2-4 to for knock-out damage to the coil. hole locations. • Never leave the unit filled with water in a building The insulation is pre-cut to aid location and removal of the without heat unless antifreeze has been added.

  • Page 45: Step 6 - Wiring

    Step 6 — Wiring CAUTION • Ensure that the supply voltage to the appliance, as indi- WARNING cated on the serial plate, is not 5% less than the rated • Disconnect power supply before making wiring con- voltage. nections or working on this equipment. Follow all ap- •...

  • Page 46: Terminal Strip Connections Installation

    Table 5 — Electric Data for All Voltages and for Units With or Without Electric Heat 42WKN PERFORMANCE (WITH ELECTRIC HEAT) PERFORMANCE (NO ELECTRIC HEAT) SUPPLY NOMINAL VOLTAGE RECOMMENDED RECOMMENDED CAPACITY (DIGIT 8) FUSE SIZE FUSE SIZE (DIGIT 6, 7) A: 115/60/1 —...
  • Page 47 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE 14 AWG BLACK DISCONNECT 14 AWG BLACK SWITCH FUSE 1.25A 208-230V / 1PH / 50-60HZ FUSE INCOMING POWER 1.25A AND GROUND 14 AWG GRN...
  • Page 48 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE 14 AWG BLACK DISCONNECT 14 AWG BLACK SWITCH FUSE 2.0A 208-230V / 1PH / 50-60HZ FUSE INCOMING POWER 2.0A AND GROUND BY OTHERS...
  • Page 49 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE 14 AWG BLACK DISCONNECT 14 AWG BLACK SWITCH FUSE 3.5A 208-230V / 1PH / 50-60HZ FUSE INCOMING POWER 3.5A AND GROUND 14 AWG GRN...
  • Page 50 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE 14 AWG BLACK DISCONNECT 14 AWG BLACK SWITCH FUSE 1.25A 208-230V / 1PH / 50-60HZ FUSE INCOMING POWER 1.25A AND GROUND BY OTHERS...
  • Page 51 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE 14 AWG BLACK DISCONNECT 14 AWG BLACK SWITCH FUSE 2.0A 208-230V / 1PH / 50-60HZ FUSE INCOMING POWER 2.0A AND GROUND 14 AWG GRN...
  • Page 52 230V LINE WIRING: USE COMPONENT LEADS OR 14 AWG BLACK UNLESS NOTED (OPTIONAL) 24V CONTROL WIRING: USE COMPONENT LEADS OR 18 AWG WHITE 14 AWG BLACK DISCONNECT 14 AWG BLACK SWITCH FUSE 3.5A 208-230V / 1PH / 50-60HZ FUSE INCOMING POWER 3.5A AND GROUND BY OTHERS...

  • Page 53: Step 7 - Fascia Assembly

    All piping is complete and insulated where necessary. Step 7 — Fascia Assembly All fans are able to rotate freely. Once the piping and electrical services have been connected, the 4 All electrical connections (both power and control) are fascia mounting bolts can be unscrewed approximately 1 in. properly terminated.
  • Page 54 CASSETTE START UP SHEET Technician’s Notes Customer Feedback: Please relay any comments about Quality or Service NOTE: Any feedback may be submitted by fax to either the sale engineer or to the local Carrier office. Fig. 54 — Start-Up Sheet Example...

  • Page 55: Sequence Of Operation

    Sequence of Operation Temperature Setpoint Adjust the desired temperature using the (+) or (–) buttons. Press ELECTRO-MECHANICAL CONTROLS the ON/SEND button to send information to thermostat. A 24-v signal from the thermostat to terminal G supplies power to the blower motor(s), condensate pump, and vane motor (if Clock equipped).

  • Page 56: Controls

    CONTROLS Table 6 — Jumper Link Control Features Setting Jumper Links JUMPER SHORT (ON) OPEN (OFF) LINKS In cool mode, fan runs WARNING In heat or cool modes, continuously. In heat JMP1 fan operates in auto mode, fan runs on mode.

  • Page 57: Maintenance Schedule

    Recommended Spares It is recommended that one complete set of air filters be kept on AVERTISSEMENT hand for use as needed. Pour l’entretien et les réparations de cet appareil, utilisez uniquement des pièces d’origine certifiées. Pour la liste com- DISASSEMBLY PROCEDURE plete des pièces de rechange, consultez Modine Manufactur- ing Company.

  • Page 58: Condensate Pump Removal

    only) downward away from the chassis. Be careful, as pan may still contain condensate. AVERTISSEMENT Condensate Pump Removal Ne tentez pas de réutiliser un composant mécanique ou électrique qui a été mouillé. Ces composants doivent être Disconnect the condensate pump and float switch wires remplacés.
  • Page 59 Table 7 — Troubleshooting PROBLEM POSSIBLE CAUSE POSSIBLE SOLUTION Faulty float switch See Condensate High Level section in this table. (Connected to microprocessor terminals ‘T4’) Fan thermal trip See Fans Will Not Run section in this table. (Connected to microprocessor terminals ‘T4’) Two LEDs Flashing...
  • Page 60 Table 7 — Troubleshooting (cont) PROBLEM POSSIBLE CAUSE POSSIBLE SOLUTION Check that the rubber condensate plug is securely fitted to the underside of the unit’s polystyrene drip tray. On some models Condensate plug loose or missing this is located underneath the fascia support rails on the pump side of the unit.

  • Page 61: Replacement Parts

    MAX TEMP PRESSURE 42WKN18 See Fig. 55. 93 862 When a component part fails, contact your local Carrier represen- SERIAL NUMBER/NNUMERO DE SERIE 555555S2215-5561 (200) 125 tative to order a replacement part. See Fig. 56 for the 42WKN unit PSIG exploded views and parts lists.
  • Page 62 DESCRIPTION DESCRIPTION Cassette Chassis 14 Freeze Protection Thermostat  (Electro-Mechanical version only) Chilled Water Coil 15 Filter Electric Heater Element Assembly 16 Fascia Assembly Condensate Tray 17 Receiver (Microprocessor Only) Condensate Tray Supports (2) Terminal Rail, Relays and Timer  Condensate Pump (Micro and Electro-Mechanical Version) High Level Switch...
  • Page 64 © 2023 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53420027-01 Printed in U.S.A. Form 42WKN-11SI Pg 64 11-23 Replaces: 42WKN-10SI...

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