Bosch TW Series - SEQUENCE OF OPERATION; Cooling Mode; Heating Mode

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Revised 03-11 Subject to change without prior notice
11
TW Series / Water to Water
up button will increment the set point at a rate
of 4 degrees per second.
• When pressed with the down arrow for 5-sec-
onds, the control will display the current tem-
perature scale (Fahrenheit or Celsius).
• Used to change the settings for: temperature
scale, dead band, test mode, initial delay, com-
pressor, pump, and malfunction settings.
DOWN Button:
• Press once to display the current set point
temperature.
• After current set point temperature is displayed,
pressing again will decrement the set point 1
degree for every push. Pressing and holding the
down button will decrement the set point at a
rate of 4 degrees per second
• When pressed with the up arrow for 5- seconds,
the control will display the current temperature
scale (Fahrenheit or Celsius).
• Used to change the settings for: temperature
scale, dead band, test mode, initial delay, com-
pressor, pump, and malfunction settings.
LED INDICATORS
Mode Indication
HEAT Red LED to indicate that the control is in
the HEATING mode
COOL Green LED to indicate that the control is in
the COOLING mode
AUTO Yellow LED to indicate that the control is in
AUTO mode
CON Red LED to indicate that pump(s) are
selected for continuous operation
Figure #4
Mode Indication
CYC Red LED to indicate that pump(s) are
selected for cycling operation
SERVICE Red LED will turn steady on or blink to
indicate that a pressure switch has opened
USER ADJUSTABLE SETTINGS CHART
Setting Range Default
Temp Setting 40-120˚ F
Heating and
Cooling
Differential 1-10˚ F 1˚ F
Mode Heat, Cool,
Auto, Off
Off
Temp Scale F, C F
Pump Mode Con
(continuous),
Cyc (cycle)
Von
Dead Band 1-6˚ F 3˚ F
Auto Change
Over
55-85˚ F 65˚ F
Test Mode De (delay), or
Nd (No delay)
De
Compressor Si (Single),
Du (Dual)
Si
Lead Lag 0 - 14 Days 0
Malfunction St (steady),
Pu (pulsing)
St
SETTING UP THE CONTROLLER
On unit power up the LED display will show the
software version, temperature differential setting
with the ability for the user to change it for ten
seconds then will display “OFF” and then nally
will display the control temperature of the uid
being measured (entering uid, leaving uid, tank,
etc.) The default setting of the differential is 1
degree F and can be adjusted from 1 – 10 degrees
F at start up.
The differential setting is the differential between
set point temperature and actual on\off tempera-
ture of the machine.
LED Indicators