Drain Piping - Hitachi FSN3E Installation And Operation Manual

DRAIN PIPING

11.9 PUMP DOWN REFRIGERANT
When the refrigerant should be collected into the outdoor unit
due to indoor/outdoor unit relocation, collect the refrigerant as
follows:
1 Attach the manifold gauge to the gas stop valve and the
liquid stop valve
2 Turn ON the power source
3 Set the DSW1-1 pin of the outdoor unit PCB at the "ON" side
for cooling operation. Close the liquid stop valve and collect
the refrigerant.
4 When the pressure at lower pressure side (gas stop valve)
indicates -0.01 MPa (-75 mmHg), perform the following
procedures immediately.
- Close the gas stop valve.
- Set the DSW1-1 pin at the "OFF" side (To stop the unit
operation).
5 Turn OFF the power source.
12 DRAIN PIPING
12.1 DRAIN DISCHARGING BOSS
When the base of the outdoor unit is temporarily utilized as a
drain receiver and the drain water in it is discharged, this drain
boss is utilized to connect the drain piping.
Model
DBS-26

Connecting procedure
1 Insert the rubber cap into the drain boss up to the extruded
portions.
2 Insert the boss into the unit base and turn approximately 40
degree counterclockwise.
3 Size of the drain boss is 26 mm (O.D.).
4 A drain pipe should be field-supplied.
20 PMML0354A rev.1 - 03/2015
Applicable Model
FS(V)N(Y)3E
!
C A U T I O N
Measure the low pressure by the pressure gauge and keep it
not to decrease than -0.01 MPa. If the pressure is lower than
-0.01 MPa, the compressor may be faulty.
?
N O T E
Do not use this drain boss set in a cold area, because the drain water
may freeze.This drain boss is not sufficient to collect all the drain water.
If collecting drain water is completely required, provide a drain-pan that is
bigger than the unit base and install it under the unit with drainage.
Drain pipe
Drain pipe
Extruded portion
Drain boss
DIP switch
(DSW1-1 ON)
Manifold gauge
Liquid
stop
valve
Gas stop valve
Drain hole
of base
Rubber cap