Understanding Swing And Staging; Hum Terminal; Dhm Terminal - Bosch TSTBM3H2CPH6W-A Installation Manual

22 TSTBM3H2CPH6W-A

underStAnding SWing And StAging

All Bosch thermostats have adjustable swings.
Cycling your HVAC system is a balance between user
comfort and equipment efficiency. Equipment wear
and tear is also a consideration.
• User comfort is maximized by small swings
• Equipment efficiency is maximized by large swings
• Equipment wear and tear is minimized by large
swings
• The ideal swing is one at which the system runs as
long and with as few cycles as possible without the
homeowner being uncomfortable
• Modern systems are designed to run longer with
fewer cycles for best efficiency
• Staging systems are designed to be most efficient
on first stage (excluding dual fuel systems)
• Equipment life is reduced by frequent on/off cycles
• The 1st stage energizes at 1x swing, the 2nd stage
at 2x swing and the 3rd stage at 3x swing.
Example:
• Thermostat system switch set to heat
• Swing setting is 1°F
• Set point is 70°

dHM terMinAl

dHM terMinAl Setting
Without Cool-to-dehumidify feature Active
1 "D" terminal is energized when a cooling call is
made or a FAN ON call is made.
and "G" terminals energized even when
2
"D"
space temp is satisfied.
"D" and "G" remain energized if cooling call is
made.
3 "D" terminal only is energized with and without
a cooling call.
4 "D" terminal only is energized without a cooling
call.
"D" terminal is de-energized when a cooling call
is made.
* These setting and condition explanations assume humidity set point has not been satisfied and the equipment is attempting to
actively dehumidify
6 720 220 376
Temp
71°F
70°F
69°F
68°F
67°F
The 1st stage will energize at 69°F and turn off at
71°F. The 2nd stage will energize at 68°F and turn
off at 69°F. The 3rd stage will energize at 67°F and
turn off at 68°F.

HuM terMinAl

HuM terMinAl Setting
1
2
3
4
* These setting and condition explanations assume
humidity set point has not been satisfied and the
equipment is attempting to actively humidify
With Cool-to-dehumidify feature Active
First stage of cooling (Y1,O,G) along with "D"
terminal are energized even if space temp is
satisfied (within the over cool limit)
When the set point is beyond the over cool limit,
the "D" will also energize with a FAN ON call
"D" and "G" terminals only are energized even
when space temp is satisfied.
"D" and "G" remain energized if cooling call is
made."
"D" terminal only is energized with and without a
cooling call
"D" terminal is energized without a cooling call
"D" terminal is de-energized when a cooling call is
made"
Subject to change without prior notice
HuM and dHM terminals
Actions
1st Stage Off
Set point
1st Stage On / 2nd Stage Off
2nd Stage On / 3rd Stage Off
3rd Stage On
"H" terminal is energized when a heating
call is made or a FAN ON call is made
"H" terminal is energized when a heating
call is made
"H" and "G" terminals are energized
with and without a heating call
"H" terminal only is energized without
heating call and remains energized with
a heating call
Revised 02-13