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Boost
Options: yes, no
/Settings>/Setback/Boost.
SET
• The morning Boost is designed to return the building to comfortable ambient temperatures
after the Setback period. The MC Elite will accomplish this by running elevated set
point in heating (will add Setback setting to the calculated Target) or reduced set point in
cooling (will subtract Setback setting from the calculated Target) for 30 minutes after the
opening of the setback terminals T3± terminals. That is, in heating, if the normal set point
was 145˚F and the Setback setting was 20˚F, the boost will raise the system calculated
temperature to 165˚F for 30 minutes after the setback.
• The Boost Set Point will appear on the main display indicating BST TGT=165F .
MODuLAtIOn sEttIngs
gain
Options: From -10 to +10
/<Settings>/Gain
SET
• The Gain adjusts the aggressiveness of the MC Elite PID logic. It does that by controlling
the amount of modulation required in response to the changes of the system temperature/
pressure when it deviates from the Target.
• A Gain of 0 is a good starting point for all systems.
• If during normal load conditions, the system value tends to oscillate, decrease the Gain by
two numbers (for example, from 0 to -2). Wait for at least 15 minutes before evaluating
the effect on the system.
• If, during normal load conditions the system value tends to remain consistently below the
Target in heating (or consistently above the Target in cooling), increase the Gain by two
numbers (for example, from 0 to 2). Wait for at least 15 minutes before evaluating the
effect on the system.
Differential
(Available when Mod. Target = H/C Unit on MCA/MCP)
Options: varies based on sensor type . see "sensor type table" on page 6 .
/<Settings>/Diff.
SET
• The Differential is a band around the Target where the MCA/MCP Elite will make small or
no changes to the heating/cooling unit.
• A smaller Differential setting normally result in tighter control of the set point but will tend
to oscillate the system. Larger Differential values normally provide a more stable system
performance, but the system may deviate further from the set point.
purge
(Available when Mod. Target = H/C Unit on MCA/MCP)
Options: 0 .0 to 10 .0 minutes
/<Settings>/Purge
SET
• Most units must go through a purge cycle before they are brought on line.
• When the MCA/MCP Elite activates a unit, it does not start to calculate its output until the
Purge delay is over. This allows the unit to fully come on and begin producing output.
• The Purge delay helps prevent short cycling of newly activated units. Once the unit is
activated, it MUST run through the entire Purge period before starting to modulate. The
message Purge: 30sec will display the Purge countdown.
• The Purge setting MUST be set to the time required by the unit's manufacturer
specification.
16
Default: no
Default: 0
Default: 2 .0 minutes
MC-Elite Installation and Operation Manual
Boost:
No
Yes
Gain:
0
Differential:
5 F
Purge:
2.0m
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