Mitsubishi Electric PAC-646BH-E Quick Start Manual

Packaged Air-Conditioner Optional PartsBase HeaterPAC-646BH-EBefore installation• This product is designed for prevention of ice on the bottom of the outdoor unit heat exchanger and the clogged drain hole caused byfreezing in severe winter.• To drain properly, a drain socket and a concentrated drain pan are not allowed to be used with this product.SAFETY PRECAUTIONSCAUTIONWARNING• Carefully read this section ‘Safety Precautions’, and securely install the optional parts.• Be sure to observe the cautions described here: They include critical contents for safety.• The following indications show the classifications for danger, and possible consequences following incorrect handling.Incorrect handling could lead to death or serious injury.Incorrect handling could lead to injury or damage to house and household articles.• After installation, perform a test run and make sure that there is no abnormality, and ask your customer to keep this installation sheetwith the installation manual at all times.Also ask the customer to transfer these manuals to a new user if the user changes.• If installed incorrectly by user, water leak, electric shock, fire, etc.could result.Ask the dealer or specialist for installation.• Incorrect installation could cause water leak, electric shock, fire,etc.Carefully install the optional parts according to this instal-lation sheet.• Improper parts could cause electric shock, fire, water leak, andinjury caused by fall of the unit.Use the provided parts and the specified parts for installation.WARNING• Improper connections and fastening could cause fire.Use the specified electric wires. Connect and fasten theelectric wires securely to the terminals so external force onthe wires will not apply on the terminals.• Incomplete installation may result in electric shock and firecaused by dust, water, etc.Mount the service panel on the outdoor unit securely.• Failure to install an earth leakage breaker may result in electricshock.Install an earth leakage breaker.• If the flammable gas should leak and accumulate around the unit,explosion may result from it.Do not install the unit where flammable gas may exist or leak.CAUTION• Do not connect the ground wire to a gas pipe, a water pipe, alightning rod, or a telephone ground wire. Improper groundingmay cause electric shock.The grounding is performed with your hands touching the fins ofthe heat exchanger. Wear protective equipment such as glovesand the like in advance.Ground the unit correctly.1 Base heater 1 2 Heater support U 2 3 Heater support L 2 4 Heater plate 15 Cable tie 3 6 Fastener 2 7 Earth plate 1 8 Earth wire 29 Screw M4×8 8 0 Self-drilling screw 2 1 Spec label 1 2 Cable strap 2It is easier to mount the base heater before installing the outdoor unit.• Make sure that the main power supply to the unit is OFF.• Do not lose the removed screws. Many screws will be removed to install the base heater.• Eliminate dust, dirt, etc.1) Remove the screw fixing the service panel.2) Remove the service panel.3) Remove the screws fixing the top panel.4) Remove the top panel.5) Remove the screws fixing the front panel.6) Remove the front panel.7) Remove the screws fixing the back panel.8) Remove the back panel.9) Disconnect the connectors (CN791, CN792, CN712, CNTH2,CNTH1, CN797, CN63H, CNF1, and relay connector), andremove the electrical box.10) Removal of propeller fan.Remove the mounting screws for the propeller fan. Pull thepropeller fan toward you to remove it.11) Removal of motor support.Disconnect the connector of the fan motor, and removemounting screw for the motor support. Slightly pull the motorsupport toward you and lift it up to remove it.12) Remove the rear guard.BH79J668H012 Preparation3 Before installation1 Accessories(Fig 1)Front panelPropeller fanMotor supportTop panelElectrical box Back panelRear guardService panelBefore installation, follow the procedures below to remove some parts from the outdoor unit.NOTE: Turn OFF power supply before disassembly.This package includes the following parts besides this installation sheet.

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