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Instructions For Debris Removal Operation - Mitsubishi Electric PURY-M200YNW-A1 Service Handbook

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[8-14 HBC Maintenance Instructions (Applicable to main and sub HBCs) ]
8-14-2

Instructions for Debris Removal Operation

This operation removes the debris that may have been introduced
during installation from the water circuit.
Perform this operation after completion of the following.
• Water piping work
*1
• Air-tightness test of water piping
• Electrical work
• Refrigerant piping work
*2
• Evacuation of refrigerant circuits
*2
• Refrigerant charging
*1. Install an automatic air vent valve at the highest point of each branch
pipe from the HBC (in two places at the highest point of the return pipe
from the Sub-HBC, and in six places at the highest point of the return
pipes from indoor units). (See Figure 1.)
Failure to install air vent valves may leave air in the water circuit and damage
the pump.
*2. Debris removal operation can be performed before completing the refrigerant piping work, evacuation of refrigerant circuits, and refrigerant
charging.
1. Preparation for debris removal operation
1. DIP SW settings
[Main-HBC]
Turn on DIP SW001-1. (Water circuit valve setting (valve open when stopped))
00
2. Turn on the breaker for each unit, and then open the manual air vent valves on the Sub-HBC and the indoor units. (The Main-HBC does not
have a manual air vent valve.)
*
Maintenance-side
3. Supply water from the water supply pipe on the HBC.
Water supply pipe
Connection of water supply pipe
4. Check that water is coming out of the manual air vent valve on each unit, and perform the debris removal operation.
128
- chapter 8
*2
Manual air
vent valve
water supply pipe, or remove the water supply hose after the debris removal
operation.
Automatic air vent
valve
Figure. 1 Automatic air vent valve
Maintenance-side
BS_08_L

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