Disassembly Procedure - Mitsubishi Electric PAC-TZ02-E Service Manual

DISASSEMBLY PROCEDURE

8
<Preparation for the repair service>
● Prepare the proper tools.
● Prepare the proper protectors.
● Provide adequate ventilation.
● After stopping the operation of the cylinder unit (hydrobox) and outdoor unit, turn off all the power-supply breaker.
● Discharge the condenser before the work involving the electric parts.
● Allow parts to cool.
● Do not expose the electric parts to water.
● When replacing or servicing water circuit parts, drain system first.
Check individual illustrations and positions of the parts by referring to the parts catalog.
Some lead wires and pipes are bundled with Bands. Cut the bands to undo the fastened pipes and lead wires if necessary.
When removing the parts associated with water pipe work, drain the 2 zone kit. Refer to "Draining the cylinder unit" or Draining
the hydrobox" on page 14.)
When draining the 2 zone kit, keep water from splashing on the internal parts (mainly electric parts and insulations).
PAC-TZ02-E
DISASSEMBLY PROCEDURE
1. How to remove the front panel
(1) Remove the 6 screws fixing the front panel (Photo 1-1
and Photo 1-2).
(2) Remove the front panel.
Photo 1-2
2. How to remove the mixing valve motor/mixing valve body
<Mixing valve motor>
(1) Remove the front panel (Refer to Procedure 1).
(2) Disconnect the TBO.2 1-3 from the controller board of the
cylinder unit (hydrobox) (Photo 5-1).
(3) Release the lead wires from the following fixtures:
(Photo 2-1 and 5-1)
• 2 cable straps on the 2 zone kit
• Cable straps and cable clamps in the control box of
the cylinder unit (hydrobox)
• Cable straps on the cylinder unit (hydrobox)
(4) Hold the motor of the mixing valve and pull hard to
remove it from the valve (Photo 2-2).
<Mixing valve body>
(5) Loosen the 3 G1" nuts using the 2 spanners (Photo 2-3).
Note: When reinstalling the G1" nuts, use new G1" gaskets.
Photo 2-2
OCH729
Screws
Mixing valve motor
Mixing valve body
: Indicates the visible parts in the photos/figures.
: Indicates the invisible parts in the photos/figures.
PHOTOS/ FIGURES
Photo 1-1
Front panel
Photo 2-1
Photo 2-3
10
Screws
Cable straps
Gasket (G1")
Nut (G1")
Gasket (G1")
Nut (G1")
Gasket (G1")
Nut (G1")