How does unoccupied heating mode work on a Type 2 Mode Control point in DMS Microsmart?

Issue

How does unoccupied heating mode work on a Type 2 Mode Control point in DMS Microsmart?

Product Line

TAC I/A Series

Environment

DMS Microsmart

Cause

Perimeter radiation valves are not controlling properly overnight.  The space temp is too warm in the morning when occupancy begins.

Resolution

The Heat/Cool Differential establishes the daytime (occupied) heating setpoint by subtracting its value from the daytime (occupied) cooling setpoint.

Example:

Cooling Setpoint = 74°F
Heat/Cool Differential = 4 (meaning the heating setpoint is 70°F)

Cooling Night Setup = 80°F (this value must be higher than the daytime cooling setpoint, which in this example is 74°F)
Heating Night Setback = 65°F (this value must be lower than the daytime heating setpoint, which in this example is 70°F)
Both of these setpoints require a level 1 STOP command to engage.