Pioneer WYS Series Installation instructions

Maintenance and
Disassembly
Page 1
1. Disassembly
1.1 Indoor unit
1. Front Panel
Procedure Illustration
1) Hold the front panel by the tabs on
the both sides and lift it (see Figure 1).
2) Push up the bottom of an air
filter (step 1), and then pull it out
downwards (step 2) (see Figure 2).
Figure 1
Figure 2
Note: This section is for reference only. Actual unit appearance may vary.
Front Panel
Tab
Filter
Disassembly Guide for WYS Series Pioneer Mini Split Indoor Air Handler
Applies to Models with Nomenclature of “WSxxxxMFIxxHLD”.

Page 2
Procedure Illustration
1) Open the horizontal louver and push
the hook towards left to open it (see
Figure 3).
2) Bend the horizontal louver lightly by
both hands to loosen the hooks, then
remove the horizontal louver (see
Figure 4).
Figure 3
Figure 4
Note: This section is for reference only. Actual unit appearance may vary.
Horizontal Louver
Hook
Hook

Disassembly
Page 3
Procedure Illustration
3) Pry the electrical cover open with a screw
driver, and rotate it towards left, then
remove it. (see Figure 5).
4) Disconnect the connector for display
board. (see Figure 6) .
Figure 5
Figure 6
Note: This section is for reference only. Actual unit appearance may vary.

Page 4
Procedure Illustration
1) Slide the front panel side to side to
release each axis (see Figure 7).
2) Open the screw cap and then remove
the 3 screws (see Figure 8).
Figure 7
Figure 8
Note: This section is for reference only. Actual unit appearance may vary.

Disassembly
Page 5
Procedure Illustration
3) Release the hooks by hand.(see
Figure 9)
4) Release the 5 hooks in the back (see
Figure 10).
5) Pull out the panel frame while
pushing the hook through a clearance
between the panel frame and the heat
exchanger. (see Figure 11)
Figure 9
Figure 10
Figure 11
Note: This section is for reference only. Actual unit appearance may vary.
Hooks

Maintenance and
Page 6
Procedure Illustration
1) Release the 5 hooks of the vertical
blades, then pull the vertical blades
rightward and remove it (see
Figure 12).
2) Remove 1 screw of the display board.
(see Figure 13).
3) Rotate the display board in the
direction shown in the right picture.
(see Figure 13).
Figure 12
Figure 13
Note: This section is for reference only. Actual unit appearance may vary.
Hooks

Page 7
2. Electrical parts (Antistatic gloves must be worn.)
Note: Remove the front panel (refer to 1. Front panel) before disassembling electrical parts.
Procedure Illustration
1) Cut the ribbon by a shear, then pull
out the coil temperature sensor (T2)
(see Figure 14).
2) Remove one fixing screw of the
electronic control box and two screws
used for the ground connection (see
Figure 14).
3) An upward force is maintained until
the cover of electronic control box is
removed (see Figure 15).
Figure 14
Figure 15
Note: This section is for reference only. Actual unit appearance may vary.
Figure 11-1
Ribbon
T2 Sensor
Ground Screws

Page 8
Procedure Illustration
4) Remove the fixed devices of the
connectors (see Figure 16).
5) Disconnect the connectors of fan
motor, the step motor and the T2
sensor (see Figure 17).
6) Open the left side plate of electronic
control box (see Figure 18).
Figure 16
Figure 17
Figure 18
Note: This section is for reference only. Actual unit appearance may vary.

Maintenance and
Page 9
Procedure Illustration
7) Open the two clips on the front of the
electric box. (see Figure 19)
8) Open the upper cover plate of
electronic control box (see
Figure 20).
Figure 19
Figure 20
Note: This section is for reference only. Actual unit appearance may vary.

Page 10
Procedure Illustration
9) Remove 1 screw and open the 2 clips
along the direction indicated in right
image (see Figure 21).
10)Pull out the electrical main board
along the direction indicated in right
image to remove it (see
Figure 22).
Figure 21
Figure 22
Note: This section is for reference only. Actual unit appearance may vary.

Page 11
3. Evaporator
Note: Remove the front panel and electrical parts (refer to 1. Front panel and 2. Electrical parts) before
disassembling evaporator.
Procedure Illustration
1) Disassemble the pipe holder located at the
rear of the unit (see Figure 23).
2) Remove the 1 screw on the evaporator
located at the fixed plate (see
Figure 24).
Figure 23
Figure 24
Note: This section is for reference only. Actual unit appearance may vary.
Pipe Holder
Screw

Page 12
Procedure Illustration
1) Release the hook on the evaporator (see
Figure 25).
2) Remove the one screw on the evaporator
located at the fixed plate (see
Figure 26).
3) Pull out the evaporator (see Figure 27).
Figure 25
Figure 26
Figure 27
Note: This section is for reference only. Actual unit appearance may vary.

Page 13
4. Fan Motor and Fan Blade
Note: Remove the front panel, electrical parts and evaporator (refer to 1. Front panel, 2. Electrical parts, and
3. Evaporator). before disassembling fan motor and fan.
Procedure Illustration
1) Remove the two screws and remove the
fixing board of the fan motor (see
Figure 28).
2) Remove the bearing sleeve (see
Figure 29).
Figure 28
Figure 29
Note: This section is for reference only. Actual unit appearance may vary.
Screws

Page 14
Procedure Illustration
1) Remove the fixing screw (see Figure 30).
2) Pull out the fan motor and fan assembly
from the side.
Figure 30
Note: This section is for reference only. Actual unit appearance may vary.
Fixing Screw

Page 15
5. Step motor
Note: Remove the front panel and electrical parts (refer to 1. Front panel, 2. Electrical parts) before
disassembling step motor.
Procedure Illustration
1) Remove the two screws, then remove the
step motor (see Figure 31).
Figure 31
Note: This section is for reference only. Actual unit appearance may vary.
Stepping Motor

Disassembly
Page 16
6. Drain Hose
Procedure Illustration
1) Rotate the fixed wire clockwise as indicated
in the right side image (see Figure 32).
2) Pull up the drain hose to remove it (see
Figure 33).
Figure 32
Figure 33
Note: This section is for reference only. Actual unit appearance may vary.