Walk-in Freezer with Defrost Issue
Kolpak Walk-in Freezer with Defrost Issue – Evaporator is Covered with Ice
After arriving at the location and speaking with client, I found the walk-in freezer temperature at approximately 50*F. Noticed that the evaporator coil was covered with ice, blocking air flow. Looks like a possible defrost issue. Went to the roof top and found condenser operational. Placed unit into defrost and check to see if defrost heaters were pulling amps. Clamp meter reading 6 amps during defrost. Data plate stated 6.3 heater amps. Allowed defrost to operate to melt ice from coil. After ice removal placed defrost timer at 3 pm. After 15 minutes of operation, timer clock did not move from the 3 pm position. Continue reading “Walk-in Freezer with Defrost Issue”
Arrived to find the box temperature at 60*F. Check temperature control and it checked out fine. Pulled off the front grille and found the discharge line was not hot. Checked the amps on the compressor, it was pulling 4.5 amps, which was lower than normal. These were indications that the unit was probably low on refrigerant. The refrigerant system is sealed from factory and did not have any service access valves. Installed bolt on access valves to the high side and low side of the system. Checked pressures with stubby gauges to read pressures. The suction pressure was in a vacuum and the high side pressure was very low. Added 100 psig of nitrogen into system in an attempt locate the leak. Heard nitrogen leaking at evaporator u-bend. Confirmed leak and location with bubbles. Purged the nitrogen charge and pulled out my