JOHNSON CONTROLS
136
FORM 145.05-NOM7
ISSUE DATE: 10/31/2019
SECTION 5 – SEQUENCE OF OPERATION
Morning Warm Up
The Morning Warm Up can be initiated in two ways:
1. A Morning Warm Up command from a BAS
2. Self initiated through the internal ADAPTIVE
MORN WARM UP ACTIVE mode
The Morning Warm Up operation is the same for all
unit configurations.
The Morning Warm Up function is active if the follow-
ing conditions are met:
• PROGRAM key, HEATING subsection: “MORN-
ING WARM UP”
is set to USER ENABLED
• The OCCUPANCY mode is UNOCCUPIED
STANDBY
• The Morning Warm Up command is received
from a BAS
The Morning Warm Up function is inactive if any of
the following conditions are met:
• PROGRAM key, HEATING subsection: “MORN-
ING WARM UP”
is set to “USER DISABLED”
• The OCCUPANCY mode is OCCUPIED
• The W1 low heat input is lost or the Morning
Warm Up command from a BAS is lost.
Sequence of Operation
1. The supply fan starts.
2. After 5 minutes, the Unit Controller compares the
Return Air Temperature to the “RAT HEATING
SETPOINT.”
3. The Unit Controller does not energize the heating
sequence if the Return Air Temperature is greater
than the “RAT HEATING SETPOINT.”
4. The Unit Controller energizes the heating se-
quence if the Return Air Temperature is less than
the “RAT HEATING SETPOINT” by 1.0°F or
more.
5. The Unit Controller sets the “SUPPLY AIR TEMP
ACTIVE SP” as follows:
• VARIABLE AIR VOLUME and FLEXSYS
units - “HEATING SAT”
• CONSTANT VOLUME units - “2ND
STAGE HEATING SETPOINT”
6. The heat source remains energized until the Re-
turn Air Temperature is greater than or equal to
the “RAT HEATING SETPOINT” plus 0.5°F, the
Morning Warm Up command is removed, or the
unit switches to OCCUPIED mode.
Adaptive Morning Warm Up
Adaptive Morning Warm Up can only be used when
the internal schedule function is employed to switch
the unit from UNOCCUPIED to OCCUPIED mode.
The Unit Controller calculates the start time for the
heat to ensure the Return Air Temperature is within
0.5°F of the “RAT HEATING SETPOINT” when the
unit switches to the OCCUPIED mode. To do this, the
Unit Controller calculates the “MORNING WARM
UP OPT TIME” by averaging the time it takes to bring
the RETURN AIR TEMP to within 0.5°F of the “RAT
HEATING SETPOINT”
for 3 consecutive days. The
3 warm up times are averaged and added to a 10-min-
ute offset. The new time is used as the “MORNING
WARM UP OPT TIME”
for the next day.
To use Adaptive Morning Warm Up, the Primary Con-
trol must be configured through the User Interface as
follows.
Required Program Values
• SCHEDULE key: the “OCCUPANCY SCHED-
ULE” must be programmed for the OCCUPIED,
UNOCCUPIED start and stop times
• PROGRAM key, UNIT DATA subsection: the
“OCCUPANCY SCHEDULE”
must be set to
USER ENABLED
• PROGRAM key, HEATING subsection:
• “MORNING WARM UP”
must be set to
USER ENABLED
• “ADAPT MORN WARM UP”
must be set to
USER ENABLED
• SETPOINTS key, HEATING subsection:
• “RAT HEATING SETPOINT” must be set to
a desired temperature to bring on
• “MORNING WARM UP MAX TIME”
must
be set with a range of 15 minutes to 240 min-
utes (default is 120 minutes)
