SMMS 1-Way Cassette YH Type
Installation Manual
EN
SMMS 1-Way Cassette YH Type
Installation Manual
– 12 –
When the electrical and wiring work has not been completed
• Disconnect the float switch connector (2P: white). (Before doing this, the power must be turned off.)
• Connect a 220 V to 240 V supply voltage to (L) and (N) on the power supply terminal block. (Do not apply a 220
V to 240 V voltage to (A), (B) of the terminal block. Otherwise, the printed circuit board may be damaged.)
• Pour the water by following the method shown in the following figure. (Amount of water poured: 500 cc)
• When the power is turned on, the drain pump automatically starts running. Check whether the water is draining
from the drain pipe connecting port, and check that no water is leaking from the drain pipe.
• After checking that the water drains and there are no water leaks, turn off the power, connect the float switch
connector to its original position.
Heat insulating process
After drain check, covering the heat insulator for drain connecting section, wrap the drain pipe with heat insulator
(Locally procured) without clearance from the end of the drain pipe connecting port of the indoor unit.
R(L)
S(N)
220 - 240 V, 50 Hz
220 V, 60 Hz
Electrical control box
White
Float switch connector (2P, White)
(Lead wire color : Black)
Pull out
Black
P.C. board connector CN030 (Red)
Float switch
Black
White
Black
Black
To cover the pipe and the indoor unit with
a heat insulator, do not make a space
between them.
Heat insulator
(locally procured)
Fix the insulator with adhesive tape
Heat insulator
(indoor unit side)
PVC pipe
(locally procured)
6
Refrigerant Piping
CAUTION
When the refrigerant pipe is long, provide support
brackets at intervals of 2.5 m to 3 m to clamp the
refrigerant pipe. Otherwise, abnormal sound may be
generated.
Use the flare nut attached with the indoor unit or R410A
flare nut.
Permissible piping length and
height difference
They vary depending on the outdoor unit. For details,
refer to the Installation Manual attached to the outdoor
unit.
Pipe size
Connecting refrigerant piping
Flaring
1. Cut the pipe with a pipe cutter.
Remove burrs completely. (Remaining burrs may
cause gas leakage.)
2. Insert a flare nut into the pipe, and flare the pipe.
Use the flare nut provided with the unit or the one
used for the R410A refrigerant. The flaring
dimensions for R410A are different from the ones
used for the conventional R22 refrigerant. A new
flare tool manufactured for use with the R410A
refrigerant is recommended, but the conventional
tool can still be used if the projection margin of the
copper pipe is adjusted to be as shown in the
following table.
Projection margin in flaring: B (Unit: mm)
Flaring diameter size: A (Unit: mm)
* In case of flaring for R410A with the conventional
flare tool, pull it out approx. 0.5 mm more than that
for R22 to adjust to the specified flare size. The
copper pipe gauge is useful for adjusting projection
margin size.
• The sealed gas was sealed at the atmospheric
pressure so when the flare nut is removed, there will
no “whooshing” sound: This is normal and is not
indicative of trouble.
• Use two wrenches to connect the indoor unit pipe.
Pipe size (mm)
Gas side
Liquid side
Ø9.5
Ø6.4
Outer dia. of
copper pipe
R410A tool used
Conventional
tool used
6.4, 9.5
0 to 0.5
1.0 to 1.5
12.7, 15.9
Outer dia. of copper pipe
A +0
–0.4
6.4
9.1
9.5
13.2
12.7
16.6
15.9
19.7
Work using double spanner
23-EN
24-EN
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