nzchillers
23-02-2009, 02:27 AM
Anyone working on Thermocold’s Quattro series of heat recovery chillers.
We are having issues with the system tripping on “hp thermal overload alarm” translated loss of power on carel pco b digital over load. The wring is connected in series through the mech hp cond fan thermal overloads and motor protection relays.
So far we have logged the system with Testo gauges and verified the charge and setup of the thermostatic expansion valves (R407c S/H 6 dew S/C 4 bubble).
The system has been isolated on chiller + recovery and recovery only to allow the system to run on cooling only to fault find.
We have swapped over the motor protection relays pco b relay board and inspected wiring to eliminate intermittent faults. The cond fans are controlled via 0 – 10v signal to inverter modules and conrol well.
The compressors have been meggared and monitored during running (discharge temp 69 – 72˚C, run amps and motor resistance measured 300 - 320ohms) motor protection module trips at 450ohms. Compressors are Copeland scroll ZR310.
We have bridged out the cond thermal overloads, and have tried to isolating one comp at a time. The system runs any where from 1 – 13 hours and trips there are no patterns available.
The compressor oil levels are ok. All solenoid coils and valves appear to be operating ok.
We have had a lot of problems with these chillers in New Zealand !
We are having issues with the system tripping on “hp thermal overload alarm” translated loss of power on carel pco b digital over load. The wring is connected in series through the mech hp cond fan thermal overloads and motor protection relays.
So far we have logged the system with Testo gauges and verified the charge and setup of the thermostatic expansion valves (R407c S/H 6 dew S/C 4 bubble).
The system has been isolated on chiller + recovery and recovery only to allow the system to run on cooling only to fault find.
We have swapped over the motor protection relays pco b relay board and inspected wiring to eliminate intermittent faults. The cond fans are controlled via 0 – 10v signal to inverter modules and conrol well.
The compressors have been meggared and monitored during running (discharge temp 69 – 72˚C, run amps and motor resistance measured 300 - 320ohms) motor protection module trips at 450ohms. Compressors are Copeland scroll ZR310.
We have bridged out the cond thermal overloads, and have tried to isolating one comp at a time. The system runs any where from 1 – 13 hours and trips there are no patterns available.
The compressor oil levels are ok. All solenoid coils and valves appear to be operating ok.
We have had a lot of problems with these chillers in New Zealand !