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Valve cover
Check points
of outdoor unit
Piping
cover
Flare nut
connections
(Indoor unit)
7
FINAL INSTALLATION CHECKS
Check and Test Operation
For R410A, use the leak detector exclusively manufactured for HFC refrigerant (R410A, R134a, etc.).
Useful Functions (SM800AT-E only)
Self-Diagnosis by LED Indication
In addition to the code checking by remote controller of the indoor unit, troubles of the outdoor unit can be diag-
nosed by LED indications on the cycle control P.C. board of the outdoor unit. Utilize them for various checks.
For the check by remote controller of the indoor unit, refer to the Installation Manual of the indoor unit.
Before a check, confirm each bit of the DIP switch is set to OFF position.
LED indication and code checking
DIP switch
SW800
Cycle control P.C. board
LED indication
D800 D801 D802 D803
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Cause
Heat exchanger sensor (TE) error
Suction sensor (TS) error
Discharge sensor (TD) error
High-pressure protection error
Outdoor temperature sensor (TO) error
DC outside fan error
Communication error between IPDU
Discharge temp. error
EEPROM error
Communication error between IPDU
G-Tr short-circuit protection
Detect circuit error
Current sensor error
Comp. lock error
Comp. break down
Phase missing detection, Detection of coming-off of CT current sensor
Serial communication error by thermo. operation of Comp. case
ON
123
4
LED
indication
D800
: Red
¡
D801
: Yellow
¡
D802
: Yellow
¡
D803
: Yellow
¡
¥
: Rapid flash
l
: Go off
¡
: Go on
*
The conventional leak detector for HCFC refrigerant
(R22, etc.) cannot be used because its sensitivity for
HFC refrigerant lowers to approx. 1/40.
• Pressure of R410A is approx. 1.6 times higher than
that of R22.
If installation work is incompletely finished, a gas
leakage may occur when pressure rises during
operation.
Therefore, be sure to test the piping connections for
leakage.
• Check gas leakage at the flare nut connections, valve
stem cap connections and service port cap fittings
with a leak detector or soap water.