Anti-short cycle delay
The ASD maintains the compressor relay off or open for a period of time after the relay cycles off.
This delay prevents the compressor from cycling back on quickly after it cycles off. Select from
0 min to 12 min for the ASD. This function works identical to a minimum off time. When you cycle
the compressor off, it remains off for the duration set in the ASD setting.
The following image shows the ASD overriding the load demand to maintain the compressor relay
off:
Figure 4: ASD overriding the load demand
Table 3: ASD overriding the load demand callout table
Item
Description
/
Load demand off/relay off
/
Load demand on/relay on
Normal on/off refrigeration cycle based on load demand
1
ASD overrides load demand
2
When ASD elapses, the existing demand closes the relay (on)
3
ASD starts when the relay opens (off)
4
Compressor relay cycling on load demand
5
Compressor relay
6
Load demand
7
ASD
Evaporator fan drip-time delay
The Evaporator fan drip-time delay holds the compressor relay and the evaporator fan relay
off or open after the defrost duration terminates. During this user-defined drip-time delay, the
evaporator coil sheds additional water. The evaporator fan drip-time delay reduces the moisture
that blows into the refrigerated space when the evaporator fans start. Select from 0 min to 10 min
for the evaporator fan drip-time delay. The evaporator fan drip-time delay is unavailable for off-
13
MR5 Series Panel Mount Case Controller Technical Bulletin
Discontinued
