Possible Failures Of Air-Conditioning And Cab Heating Systems And Instructions For Troubleshooting - Belarus 1523.5 Operator's Manual

6.15 Possible failures of air-conditioning and cab heating systems and instructions
for troubleshooting
List of possible failures of air-conditioning and cab heating systems and guidelines for
troubleshooting are shown in Tables 6.15а and 6.15b.
Table 6.15а – Possible failures of air-conditioning and cab heating systems and guidelines
for troubleshooting
Failure, external manifestations,
cause
Coolant is not circulated through
heating unit:
- turn over heater control valve
- heater fan is out of order
Leakage of coolant in heating radi-
ator
Leakage of coolant in heating sys-
tem connection
WARNING: DURING TRACTOR DISCONNECTION, CLOSED-CIRCUIT AIR CONDI-
TIONING SYSTEM MAY BE DETACHED BY MEANS OF SEPARATION OF A QUICK
DISCONNECT COUPLER. DISCONNECTION SHALL BE PERFORMED BY UNSCREW-
ING CAP NUT "B" (FIGURE 6.15.1) (WITH HEXAGON SCREW KEY SIZE 30MM) FROM
VALVE "A" (WITH HEXAGON SCREW KEY SIZE 29 MM)! WHILE CONNECTING THE
DUCT, IT IS NECESSARY TO PUT SILICONE SEALANT ON THE THREAD. AFTER
THREE OR FIVE DISCONNECTIONS A LEAKAGE CAN OCCUR IN THE JUNCTION
POINT – IN THIS CASE IT SHALL BE REPLACED!
WARNING: WHILE DISCONNECTION AND CONNECTION OF DUCTS, WEAR PRO-
TECTIVE GLOVES AND GLASSES!
WARNING: ANY OPERATIONS RELATED TO DISCONNECTION OF AIR CONDITION-
ING SYSTEM COMPONENTS SHALL BE CARRIED OUT ONLY BY TRAINED PER-
SONNEL WITH USE OF SPECIAL EQUIPMENT FOR AIR CONDITIONING SYSTEM
MAINTENANCE. HIGH PRESSURE IS MAINTAINED EVEN IN THE SHUT SYSTEM!
WARNING: COOLING AGENT R134A IS NON TOXIC, NON COMBUSTIBLE, NOT
FORMING EXPLOSIVE MIXTURES. COOLING AGENT BOILING TEMPERATURE UN-
DER NORMAL CONDITIONS IS MINUS 27  С. IN CASE OF SKIN CONTACT WITH LIQ-
UID COOLING AGENT, IT FLASHES AND CAN CAUSE OVERCOOLING OF SKIN ARE-
AS!
WARNING: ONLY SPECIALLY TRAINED PERSONNEL IS ALLOWED TO PERFORM
REPAIR AND MAINTENANCE SERVICES OF SYSTEM COMPONENTS!
Warm air is not supplied into the cab
Warm air of high humidity is supplied into the cab
Troubleshooting
Open the heater control valve
Correct the fan failure, check electric circuit of fan
engagement according to the electrics diagram
Leakage of coolant in heating radiator
Leakage of coolant in heating system connection
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1523.5-0000010 OM