Mitsubishi Electric PUHY-HP120TNU-A, Service Handbook

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[8-12 Parts Replacement Instructions ]
70
- chapter 8 HWE18240_GB
8 Troubleshooting Based on Observed Symptoms
8-12-8 Maintenance Procedures for the Heat Exchanger
1. L-module
(1) Remove the two front panels from the unit by unscrewing the 14 screws. (See Figure 2.)
(2) Remove the fin guard by unscrewing the 12 screws. (See Figure 2.)
(3) Remove the cable straps holding the weak and strong electrical wirings. (See Figure 3.)
(4) Remove the center pillar by unscrewing the 5 screws. (See Figure 2.)
(5) Remove the drain cover by unscrewing the screw and cutting the cable tie. (See Figures 3 and 4.)
When re-placing the drain pan cover, make sure that the silicon tube is properly placed on the defrost pipe, and then fix the
drain pan cover in place with a cable tie.
(6) Remove the drain pan by unscrewing the 2 screws. (See Figure 3.)
Be sure to remove the two rod holders holding the check joints to the drain pan. (See Figure 4.)
(7) Remove the cover from the control box by unscrewing the 5 screws. (See Figure 5.)
(8) Remove the cable straps to disconnect the wiring. (See Figure 6.)
Drain pan cover
Silicon tube
Defrost pipe
Fin guard
Figure 2
Drain pan
Figure 3
Drain pan cover
Figure 4
Rod holder
Cable strap
Figure 5
Figure 6
Control box cover
Center pillar
Cable strap for
holding strong
electrical wiring
Cable strap for
holding weak
electrical wiring
Figure 1
Front heat exchanger
Trans box (YNU)
Front of the unit
Rear heat exchanger