Daikin DX20VC - Servicing

SERVICING TABLE OF CONTENTS
18
TABLE OF CONTENTS
S-1 CHECKING VOLTAGE ........................................19
S-2 CHECKING WIRING .......................................... 19
S-3 CHECKING THERMOSTAT AND WIRING......... 19
S-3A THERMOSTAT AND WIRING............................. 19
S-3E DAIKIN COMMUNICATING THERMOSTAT ...... 19
S-4 CHECKING TRANSFORMER AND
CONTROL CIRCUIT .......................................... 20
S-12 CHECKING HIGH PRESSURE SWITCH........... 21
S-13 CHECKING INDOOR/OUTDOOR HI/LOW
PRESSURE SENSOR ....................................... 21
S-15A RESISTANCE CHECK ....................................... 21
S-15B CAPACITANCE CHECK (5 TON ONLY) ............ 22
S-17 CHECKING COMPRESSOR ............................. 22
S-17A RESISTANCE TEST ........................................... 22
S-17B GROUND TEST ................................................. 23
S-18 TESTING CRANKCASE HEATER
(5 TON ONLY) .................................................... 23
S-26 TESTING TEMPERATURE SENSORS
AND EEV COIL RESISTANCE............................ 23
S-40A MBVC**00AA-1 HEATER CONTROL ................ 24
S-40B DV**PEC HEATER CONTROL .......................... 25
S-50 CHECKING HEATER LIMIT CONTROL(S) ....... 25
S-52 CHECKING HEATER ELEMENTS ..................... 26
S-60 ELECTRIC HEATER (OPTIONAL ITEM) ........... 26
S-61A CHECKING HEATER LIMIT CONTROL(S) ....... 27
S-61B CHECKING HEATER FUSE LINK ..................... 27
(OPTIONAL ELECTRIC HEATERS) .................. 27
S-100 REFRIGERATION REPAIR PRACTICE ............. 27
S-101 LEAK TESTING (NITROGEN OR
NITROGEN-TRACED) ....................................... 28
S-102 EVACUATION .................................................... 28
S-103 CHARGING ........................................................ 29
S-104 CHECKING COMPRESSOR EFFICIENCY........ 29
S-105B THERMOSTATIC EXPANSION VALVE .............. 30
S-106 OVERFEEDING ................................................. 30
S-107 UNDERFEEDING ............................................... 30
S-108 SUPERHEAT ...................................................... 30
S-109 CHECKING SUBCOOLING ............................... 31
S-110 CHECKING EXPANSION VALVE OPERATION . 32
S-114 NON-CONDENSABLES ..................................... 32
S-115 COMPRESSOR BURNOUT .............................. 32
S-120 REFRIGERANT PIPING .................................... 33
S-202 DUCT STATIC PRESSURES AND/OR
STATIC PRESSURE DROP ACROSS COILS ... 36
S-203 AIR HANDLER EXTERNAL STATIC .................. 36
S-204 COIL STATIC PRESSURE DROP ...................... 36
HIGH VOLTAGE!
D
ISCONNECT ALL POWER BEFORE SERVICING OR
INSTALLING THIS UNIT .
M
ULTIPLE POWER SOURCES
MAY BE PRESENT . F AILURE TO DO SO MAY
CAUSE PROPERTY DAMAGE , PERSONAL
INJURY OR DEATH .