Opening PMV’s on Toshiba 3 Pipe VRF (R410a)
Step by step guide on how to open up all PMV’s on indoor and outdoor units to enable successful refrigerant
recovery, pressure test and evacuation
1.
Before starting ensure that you have power applied to all indoor and all outdoor units
2.
Ensure that on each condenser you have a normal display of U1--- and U2--- dependent on the quantity of
outdoors while the yellow rotary dials are at positions 1-1-1
3.
Place yellow rotary dials at position 2-3-1 left to right, on the lead condenser U1---,
4.
Press push button SW04 just above the hexadecimal display for several seconds
[P ] [ FF] is displayed on the hexadecimal display (meaning that all the PMV’s on the indoors are in the
open position)
5.
You now have a 2 minute window to turn the power off to the indoor units either at the isolator or
distribution board to lock the valves in the open position
6.
At condenser 1, bridge out the pins of CN30 on the main interface board for 10 seconds with the blade of a
screwdriver and turn off power
7.
Complete step 6 in any remaining condensers if modularised
[P ] will appear
Once your procedures of refrigerant recovery, pressure test or evacuation are complete there are no reverse
procedures to follow, the valves will then close automatically once power is applied