Energence Ultra-High Efficiency Units (3- To 6-Ton); Tandem Compressors - Energence Ultra-High Efficiency Units (7-1/2 To 12-1/2-Ton); Tandem Compressors - Energence Ultra-High Efficiency Units (15- And 20-Ton); High Pressure Switches (S4, S7, S28 And S96) - Lennox PRODIGY2.0 Application Manual

On certain compressors, these switches are in series with the high pressure switches, and will cause a 300 second delay
(default) which is set using parameter 110. This will also set off an alarm. Adjustable delay range is 64 to 1800 seconds.
Go to SETTINGS > RTU OPTION > EDIT PARAMETER = 98 (MAX HP OCCURRENCES)
Go to SETTINGS > RTU OPTION > EDIT PARAMETER = 110 (ERR TIME OFF DELAY)
NOTE: Thermal protection switch alarms will not indicate an OFF ON ALARM state (see table 61).
3.1.4.1.

Energence Ultra-High Efficiency Units (3- to 6-ton)

This model has a thermal protection switch connected to S7. When the compressor is de-energized due to an open
thermal switch, alarm 192 is issued. When the compressor is locked out after three occurrences, alarm 193 is issued.
3.1.4.2. Tandem Compressors — Energence Ultra-High Efficiency Units (7-1/2 to 12-1/2-ton)
This model has two temperature switches (S5 and S8) in series with one pressure switch (S4). If only one temperature
switch is tripped, only the applicable compressor will be de-energized. If pressure switch trips, both compressors are
de-energized.
3.1.4.3. Tandem Compressors — Energence Ultra-High Efficiency Units (15- and 20-ton)
This model has two thermal protection switches (S5 and S8) in series with two pressure switches (S4 and S28). If only
one compressor shuts-off, this usually indicates that the problem is related to a temperature switch. If a pressure switch
opens, both compressors in tandem will shut-off.
3.1.5.

High Pressure Switches (S4, S7, S28 and S96)

High pressure switches open on a pressure rise to de-energize the corresponding compressor for 300 seconds (five
minutes (default) which is set using parameter 110. Switches automatically reset when pressure drops. The
corresponding compressor is locked out after three occurrences (default) which is set using parameter 98. Adjustable
range is 1 to 7 occurrences. When a compressor is de-energized due to an open high pressure switch, alarm 12 (S4
switch), 14 (S7 switch), 16 (S28 switch) or 18 (S96) is issued.
NOTE: The outdoor fan on Energence Standard, High and Ultra-High Efficiency 3- to 6-ton models continue to run even
after a high pressure switch trip.
NOTE: Only the displayed alarm(s) will indicate that the applicable compressor has been de-energized. The system
status on the display will only indicates the current demand type in this scenario.
NOTE: High pressure switch alarms will not indicate an OFF ON ALARM state (see table 61).
The corresponding compressor is locked out after three occurrences (default) which is set using parameter 98.
Go to SETTINGS > RTU OPTION > EDIT PARAMETER = 98 (MAX HP OCCURRENCES)
3.1.5.1.

Energence Ultra-High Efficiency Units (7-1/2 to 12-1/2 ton)

This model has one pressure switch (S4) that is connected in series with two temperature switches (S5 and S8) (see
figure to right). If pressure switch trips, both compressors are de-energized. If only one temperature switch is tripped, only
the applicable compressor will be de-energized.
3.1.5.2. Energence Ultra-High Efficiency Units (15- and 20-ton) — Tandem Compressors Units
This model has two pressure switches (S4 and S28) that are connected in series with thermal protection switches (S5 and
S8). If a pressure switch opens, both compressors in tandem will shut-off. If only one compressor shuts-off, this usually
indicates that the problem is related to a temperature switch.
3.1.6.

Low Pressure Switches (S87, S88, S97 and S98)

Depending on the model, one to four low pressure switches may be employed. Refer to the unit installation instruction or
wiring diagram to verify the number utilized.
Low pressure switches may trip during lower outdoor temperatures, especially with longer time periods between
compressor cycling. Each compressor stage has low pressure switch protection which:
•
Ignores the low pressure switch for a specified period of time after thermostat demand.
•
De‐energizes the compressor for five minutes (default) if the low pressure switch trips (once the ignore time period
which is set using parameter 100 has elapsed). Default is 120 seconds. Setting range is 0 to 600 seconds.
Go to SETTINGS > RTU OPTION > EDIT PARAMETER = 100 (LP SW IGNORE TIME)
•
Locks out the compressor stage if the low pressure switch trips three times (default) within the same thermostat
demand (once the ignore time period is elapsed).
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