Trane Arctic Thermafit AXM, Инструкция по установке, эксплуатации и обслуживанию

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ARTC-SVX006A-EN 61
13. Symptom: No low voltage (24 Vac)
Possible Causes Potential Solutions
Transformer primary side fuse open Check fuse prong contact points; Replace fuse
Transformer defective
Replace transformer
No primary voltage on transformer Check breakers, fuses; Check power supply specifications
14. Symptom: Thermal Expansion valve superheat too high
Possible Causes Potential Solutions
Water/glycol temperature too warm Check setpoints; Check charge
Obstructed filter dryer Replace dryer core
Low refrigerant charge Recharge refrigerant as per data plate
Improper and not enough heat transfer at air coil Check tube and fin surface; Check fan settings
Sensing bulb not properly located Check if secured to pipe or insulated; Check sensor position on pipe
Defective or improper settings of EXV/TXV Check EXV/TXV functions; Check EXV/TXV settings
15. Symptom: Thermal expansion valve superheat too low
Possible Causes Potential Solutions
Sensing bulb not properly located Check if secured to pipe or insulated; Check sensor position on pipe
Defective thermostatic element (TXV is cooling mode) Replace power head
EXV/TXV valve superheat setting is too low or not functioning properly Check EXV/TXV settings and functionality
16. Symptom: Contactor/relay inoperative
Possible Causes Potential Solutions
Coil shorted or open Replace coil
Mechanical parts broken or jammed Replace assembly
Contacts pitted or burned Replace contactors
No 24 Vac to coil
Replace secondary fuse to transformer; Check transformer
17. Symptom: Freeze protection safety activated
Possible Causes Potential Solutions
Chiller setpoint is too low Use a proper setpoint
Low water flow
Clean strainer; Check pump, VFD and differential pressure settings
Low suction pressure See “low suction pressure”
Heat Pump Troubleshooting