Mitsubishi Electric PAC-646BH-E User manual

Packaged Air-Conditioner Optional Parts
Base Heater
PAC-646BH-E
Before installation
• This product is designed for prevention of ice on the bottom of the outdoor unit heat exchanger and the clogged drain hole caused by
freezing in severe winter.
• To drain properly, a drain socket and a concentrated drain pan are not allowed to be used with this product.
SAFETY PRECAUTIONS
CAUTION
WARNING
• 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 classications 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 sheet
with 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, re, etc.
could result.
Ask the dealer or specialist for installation.
• Incorrect installation could cause water leak, electric shock, re,
etc.
Carefully install the optional parts according to this instal-
lation sheet.
• Improper parts could cause electric shock, re, water leak, and
injury caused by fall of the unit.
Use the provided parts and the specied parts for installation.
WARNING
• Improper connections and fastening could cause re.
Use the specied electric wires. Connect and fasten the
electric wires securely to the terminals so external force on
the wires will not apply on the terminals.
• Incomplete installation may result in electric shock and re
caused by dust, water, etc.
Mount the service panel on the outdoor unit securely.
• Failure to install an earth leakage breaker may result in electric
shock.
Install an earth leakage breaker.
• If the ammable gas should leak and accumulate around the unit,
explosion may result from it.
Do not install the unit where ammable gas may exist or leak.
CAUTION
• Do not connect the ground wire to a gas pipe, a water pipe, a
lightning rod, or a telephone ground wire. Improper grounding
may cause electric shock.
The grounding is performed with your hands touching the ns of
the heat exchanger. Wear protective equipment such as gloves
and the like in advance.
Ground the unit correctly.
1 Base heater 12 Heater support U 23 Heater support L 24 Heater plate 1
5 Cable tie 36 Fastener 27 Earth plate 18 Earth wire 2
9 Screw M4×8 8 0 Self-drilling screw 21 Spec label 12 Cable strap 2
It 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 xing the service panel.
2) Remove the service panel.
3) Remove the screws xing the top panel.
4) Remove the top panel.
5) Remove the screws xing the front panel.
6) Remove the front panel.
7) Remove the screws xing the back panel.
8) Remove the back panel.
9) Disconnect the connectors (CN791, CN792, CN712, CNTH2,
CNTH1, CN797, CN63H, CNF1, and relay connector), and
remove the electrical box.
10) Removal of propeller fan.
Remove the mounting screws for the propeller fan. Pull the
propeller fan toward you to remove it.
11) Removal of motor support.
Disconnect the connector of the fan motor, and remove
mounting screw for the motor support. Slightly pull the motor
support toward you and lift it up to remove it.
12) Remove the rear guard.
BH79J668H01
2Preparation
3 Before installation
1 Accessories
(Fig 1)
Front panel
Propeller fan
Motor support
Top panel
Electrical box Backpanel
Rear guard
Service panel
Before 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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• Tighten the propeller fan with a torque of 3.4 0
-0.5 N•m [2.5 0 -0.4 ft-lbs](34 0 -5 kgf•cm).
• Rotate the propeller fan and make sure that the base heater and the lead wires do not
interfere with the movement of propeller fan.
CN714
(BU)
[OUTDOOR
CONTROL P.C.
BOARD]
1
2
1
2
1
2
1
2
BK
YE
RD
BASE HEATER
BK
BK
BK BK
BK BK
THERMAL
PROTECTOR
6Securing the lead wires
7 After installation
Wiring diagram
Connect the lead wires according to the wiring diagram
on the right.
1) Bundle the lead wires of the base heater and
the fan motor together, and x 2 positions with
the cable ties 5.
● Secure the lead wires so they will not
interfere with the propeller fan.
● Hook the lead wire of the fan motor to the
hook on the motor support and the ditch.
2) Reinstall the rear guard.
3) Attach the 2 cable straps 2 on the separator as
shown in Fig 6.
● The holes to mount the cable straps 2are
covered with aluminum tape.
Remove the tape before attaching the cable
straps 2.
4) Hook all the lead wires in the notch of the
separator.
5) Secure the lead wire of the base heater with the
2 cable straps 2.
6) Secure other lead wires with 3 clamps on the
separator.
7) Reinstall the electrical box.
Reconnect the connectors.
8) Connect the lead wire of the base heater to the
connector CN714 on the controller circuit board
as show in the Fig 7.
9) Bundle all the connectors except CN791,
CN792, and relay connector with the fastener 6.
1) Reinstall the propeller fan, back panel, front panel, top panel, and service
panel.
2) Attach the spec label 1 below the spec name plate.
3) Turn on the breaker, and perform test run to conrm that it works properly.
* Do not install either drain socket which is provided with the outdoor unit
or purchased separately.
Inside of the drain hose and/or the drain socket may freeze if the drain
socket is installed.
Motor support
Lead wire of
fan motor
Hook in the notch
Hook in the notch
on the separator
Cable tie 5
Hook
(Fig 6)
Attaching positions
of the cable straps 2
Cable straps 2
Clamp
(Fig 8)
Spec label 1
Spec name plate
(Fig 7)
CN714
Fastener 6
Mount the outer panels securely. Incomplete installation may result in electric shock and re caused by dust, water, etc.
WARNING
BH79J668H01
1) Hold the left lower side of the heat exchanger and slightly lift it up as
shown in the Fig 3.
2) Insert the base heater 1 under the heat exchanger, and align it with the
groove on the base. Conrm that the heater supports are placed as they
t in the drain holes.
3) Mount the motor support.
NOTES:
● Take out the earth wire to the left side of the motor support.
● Make sure that the lead wire is not caught between the bottom of the
motor support and the base.
4) Fix the front side of the base heater 1 with the heater plate 4.
Fix the heater plate 4 and motor support with the 2 screws that were
installed to x the motor support as shown in the Fig 4.
5) Screw the earth plate 7 on the motor support by self-drilling screw 0as
shown in the Fig 5.
6) Fix the 2 earth wires 8 which are attached to the heater support to the
earth plate 7.
5 Installing the base heater
Screw ST
4×10
Motor support
Heater plate 4
Earth plate 7
(Fig 4) (Fig 5) Self-drilling
screw
0
Screw M4×8 9
Motor support
Earth
wire
8
Earth plate 7 location of installation
Align the center of
earth plate
7 with
the middle of guards.
1) Fix the heater support U 2 and L 3 to the base heater 1 with 2 screws M4×8 9 (2 places) as shown in the Fig 2.
(Place the heater supports as they t in the drain holes).
2) Fix an earth wire 8 to each heater support L 3 with screw M4×8 9.
4Preparation for mouting the base heater
Base heater 1
Heater
support U 2
Heater support L 3
Earth wire 8
Earth wire 8
Screw M4×8 9
Screw M4×8 9
(Fig 2)
Drain hole
Base heater 1
(Fig 3)
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