Suction pressure problems on TS units at low ambient temps

[nova]

We've faced some problems with the suction pressures in TS-series at low ambients. When delivering fresh products with setpoint +4C or so and ambient -20C or below unit cools ok (if needed, not likely at -20C ambients, tho) and after reaching setpoint, heats ok but during heat mode suction pressure goes low. Not necessarely to vacuum, but near 0 anyway. This is probably because there’s no engine coolant heat in accumulators anymore so liquid in accumulator is not able to absorb any heat at low ambients. Unit might go to vacuum during heat mode, but most likely it’ll after unit shifts back to cool again. Unit shuts down with code 10 “High discharge pressure/temperature (+low suction pressure after introducing the low pressure cut-out switch (LPCO) on TS units). We’ve measured the suction pressure and it has been the same before and after suction pressure regulator. I think the only way to overcome this problem is disconnect the LPCO for good. We’ve been wondering why LPCO was introduced at the first place as TS series units has been working like a charm even in Finnish climate. We haven’t had any major scroll compressor problems before LPCO, so disconnecting it would probably be the best bet.

Code 10 problems in other countries (applies to Spectrum TS & code 93)?