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10-1-3. Refrigerant recovery procedure B (Case of outdoor unit
backup operation setting)
<Outline>
If outdoor unit backup operation setting is performed, use an alternative refrigerant recovery procedure as
described below, provided that the power cannot be turned on for the failed outdoor unit. (Refrigerant will be
recovered from the failed outdoor unit using the test cooling operation function.)
Note 1: If cooling-season outdoor unit backup operation or outdoor unit backup operation is in progress with the
power supply to the failed outdoor unit turned on, follow the procedure described in “10-1-2. Refrigerant
recovery procedure A (Case of no outdoor unit backup operation setting)”. If outdoor unit backup
operation setting is performed with the power supply to the failed outdoor unit turned on, recovery
operation can only start after putting the outdoor-outdoor communication connector on the interface P.C.
board of that unit [CN03] back to its initial state and resetting the power supply.
Note 2: 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 of the failed outdoor unit.
(Leave the service valve of the 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, press 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 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.
(1)
(2)
Pd
Ps
Td1
Td2
Td3
TS
TE1
TE2
C~C
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 gas and balance pipes fully
open.)
(3) Set SW01/02/03 to 2/5/1.
[C. ] [… … …] is displayed
(4) Press SW04 and hold for 5 seconds or more.
[C. …] [… – C] is displayed. (Test cooling
operation begins).
(5) Set SW01/02/03 to 1/2/2 to have low-pressure
sensor output (MPa) displayed.
Содержание MMY-MAP0804HT7JP
Страница 23: ... 22 1 Wiring Diagrams 1 1 Outdoor Unit Models MMY MAP0804 MAP1004 and MAP1204 ...
Страница 24: ... 23 Models MMY MAP1404 and MAP1604 ...
Страница 35: ... 34 1 2 10 Slim Duct Type AP024 AP027 Models MMD AP0244SPH MMD AP0274SPH ...
Страница 38: ... 37 1 2 13 High Wall Type 3 series Models MMK AP0073H AP0093H AP0123H AP0153H AP0183H AP0243H ...
Страница 52: ... 51 2 5 Parts Layout in Outdoor Unit 8 10 12HP Model MMY MAP0804 MAP1004 MAP1204 ...
Страница 53: ... 52 14 16HP Model MMY MAP1404 MAP1604 ...
Страница 57: ... 56 2 7 2 Inverter P C board for compressor MCC 1596 A3 IPDU ...
Страница 323: ......