(30A) Cannot Reach Setpoint Timeout; (31A) Cannot Reach Setpoint Action; Parameters Applicable To Conventional And Heat Pump Systems; (70A) Minimum Compressor Run Time (Mcrt) - Lutron Electronics PALLADIOM Configuration Manual

Step 5: Set the SMC55-HWQS Advanced Parameters to Modify the
Functionality of the HVAC System
Parameters Applicable to All Types of HVAC Equipment
(26A) Cannot Reach Setpoint Timeout
Use this parameter to identify the maximum time it should take to reach the desired setpoint. If the desired setpoint is not
reached within this time then an alarm is triggered to notify the user.
(27A) Cannot Reach Setpoint Action
Use this parameter to identify whether or not the system should continue heating or cooling after the alarm for 'Cannot Reach
Setpoint' is triggered.
Set this parameter to '00' if the system should continue heating/cooling. Set this parameter to '01' if the system should stop
heating or cooling when 'Cannot Reach Setpoint' alarm is triggered.

Parameters Applicable to Conventional and Heat Pump Systems

This section lists out the details of the advanced configuration parameters applicable to Conventional and Heat Pump systems.

(70A) Minimum Compressor Run Time (MCRT)

Use this parameter to identify the minimum time the compressor must run to ensure proper lubrication. Refer to Figure 8 below.
Even though the desired temperature setpoint is met the compressor will run for an additional amount of time till the minimum
compressor run time expires.
Figure 8: Compressor Runs Until Minimum Compressor Time Expires
Min Compressor Run Time
Call Input for Compressor
Y - Compressor
1
signal out

(71A) Minimum Compressor Off Time (MCOT)

Use this parameter to identify the minimum time for which the compressor must remain Off before it can start. This delay is
intended to reduce compressor restart stress. Fan will stay off in Auto mode during this delay. Refer to the Figure 9 below, the
compressor will start only after MCOT has expired.
Figure 9: Minimum Time for Which The Compressor Must Remain Off Before It Can Start
Min Compressor Off Time
Call Input for Compressor
Y - Compressor
1
signal out
G - Fan output signal
Continued on next page...
Call for no
compressor
MCRT = 1 minute MCRT = 1 minute
MCRT Starts MCRT Starts
Time
Call for no compressor,
MCOT Start
MCOT = 5 minute
Time
(continued)
(continued)
Call for no
compressor
Call for no compressor,
MCOT Start
MCOT = 5 minute
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