JOHNSON CONTROLS
27
FORM 100.50-SU8
ISSUE DATE:1/28/2016
10
Morning Warm-Up is a control sequence that allows
a unit to start the heat source and then heat the entire
building at the same time until a comfortable temper-
ature is reached. It is typically performed before the
building goes into an Occupied mode.
Before starting a morning warm-up sequence, it is high-
ly recommended to open all VAV or Flexsys underfloor
boxes to their max position.
On a Series 100 unit, the unit must be in an Unoccu-
pied mode before Morning Warm-Up can be initiated.
Morn Warm-Up is a function of the unocc mode.
There are 3 ways to initiate a morn warm-up sequence:
1. Hardwired digital signal to the W1 input (Typi-
cally for units set up for Constant Volume)
2. Self initiated thru the “Adaptive Morn Warm-Up
Active” mode
3. Receiving a command from a BAS
On points that have an AV and BV num-
ber, changing the one will also change
the other.
Morning Warm-Up must be enabled. This is either
done at the unit controller or can be done thru the BAS.
MORN_WARM_UP (AV85 or BV9) 0=Disabled
1=Enabled.
Set the Morning Warm-Up Temp SP. (This is the same as
the Heating Return Air Temp SP) MORN_WUP_RAT
(AV15). (This value is limited by the RAT_COOL_SP
(AV23)). The two values can be no closer than 2 °F,
so if the RAT_COOL_SP is 70 °F, the MORN_WUP_
RAT cannot go higher than 68 °F without first raising
the RAT_COOL_SP).
Set the supply air temp SP: HEATING_SAT (AV09).
MORNING WARM-UP SEQUENCE
1. With the unit in an Unocc mode, send a command
to start the Morn Warm-Up sequence. MORN_
WUP_CMD (AV86 or BV10).
2. The S100 unit will enter the Morn Warm-Up
mode and start the Supply Fan. The Supply Fan
VFD will control to duct static SP if unit is VAV or
Flexsys. Supply Fan will run at full speed, 100%
forCVandSZVAVconguredunits.
3. After running the fan for 5 minutes, the unit con-
troller will compare the current Return Air Temp,
RET_AIR_TEMP (AI40), to the RAT Heating SP,
MORN_WUP_RAT (AV85 or BV9).
4. If the current RAT (AI40) is greater than the RAT
Heating SP (AV85 or BV9) minus 1 °F, the heat
will not be energized.
5. If the current RAT (AI40) is less than or equal to
the RAT Heating SP (AV15) minus 1 °F, the heat
will be energized.
6. The heating medium will use as much or as little
of its capacity as needed to achieve the Heating
SAT SP (AV09).
7. The heat will stay energized until the RAT (AI40)
is greater than or equal to RAT Heating SP (AV15)
plus 0.5 °F.
8. The Series 100 unit will stay in the Morn Warm-
Up mode until the command is removed, or the
unit enters an Occupied mode
SECTION 10 - MORNING WARM-UP
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