Toshiba R410A, Быстрая справка

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Outdoor Unit Refrigerant Recovery Method
(Continued)
[Setup of the power cannot be turned on the failed outdoor unit]
If the power cannot be turned on the failed outdoor unit, the solenoid valves and PMVs of the unit cannot be turned
on, so that it reduces the amount of recovered refrigerant compared to a standard pump-down operation. Recover
the residual gas in the unit using a refrigerant recovery device, and be sure to measure the amount of recovered
refrigerant.
<Work procedure>
[Setup of failed outdoor unit]
(1) Connect the liquid pipe check joint and the low pressure-side check joint using a gauge manifold, and purge the
manifold of air (to recover refrigerant from the liquid tank and heat exchangers).
(2) Fully close the liquid pipe packed valve and service valve at discharge gas side of the failed outdoor unit.
(Leave the service valve of the suction gas pipe and the packed valve of the balance pipe fully open.)
[Setup of unit selected as header unit (hereafter “header outdoor unit”)]
(3) Set SW01/02/03 on the interface P.C. board of the header outdoor unit to 2/5/1. After [C. ] [… … …] is displayed
on the 7-segment display, push SW04 and hold for 5 seconds or more.
(4) After [C. …] [… – C] is displayed on the 7-segment display, the system starts operating in the test cooling
operation mode.
(5) Set SW01/02/03 on the interface P.C. board of the header outdoor unit to 1/2/2 to have the low-pressure sensor
output (MPa) displayed on the 7-segment display.
(6) Approx. 10 minutes after the system starts up, fully close the suction gas pipe service valve of the failed outdoor
unit.
[Setup of outdoor unit for pressure adjustment]
(7) Select the header unit as the unit for pressure adjustment.
[Setup of outdoor units other than header unit and failed unit]
(8) Leaving the balance pipes of the unit for pressure adjustment and the failed unit fully open, fully close the
balance pipe packed valves of all other outdoor units.
[Setup of header unit]
(9) While monitoring the low-pressure sensor output, adjust the pressure to around 17 psi (0.12 MPa) by slowly
closing the suction gas pipe service valve.
(10) Compare the manifold gauge pressure of the failed unit with the low-pressure sensor output of the header unit,
and wait until the two pressure readings become almost identical. After letting the system continue operating
for a while longer, fully close the suction gas pipe service valve of the unit for pressure adjustment.
(1)
(2)
Connect liquid pipe check joint and
low pressure-side check joint using
gauge manifold, and purge manifold
of air.
Failed outdoor unit Unit selected as header unit
Interface P.C. board
Fully close liquid pipe service valve.
(Leave suction gas and balance
pipes fully open.)
(3) Set SW01/02/03 to 2/5/1.
[C. ] [ ... ... ...] is displayed
(4) Push SW04 and hold for 5 seconds or more.
[C. ...] [ ...
−
C] is displayed. (Test cooling
operation begins).
(5) Push SW04 to display the low pressure psi (MPa)
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