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Manual Lockout
TW Series Water to Water
TW Series Water to Water
6720220047 (2016/02)
Subject to change without prior notice
Brownout Protection
The control will disable all outputs if the supply
voltage drops below 17 VAC. The outputs will be
enabled if the supply voltage rises and remains
above 17 VAC for the 5 minutes time delay. During
that time control will display “bro.”
MANUAL LOCKOUT
The unit or refrigeration circuit will go into a manual
lockout if the HPS or LPS opens (LPS open more than
120 seconds each time) twice within one hour. During
manual lockout the compressor(s) is turned off and
locked out and the display will show the fault (for
example LP1) and the “service” LED “malfunction”
output will either be steady or blink according to the
malfunction mode as described above.
If selection for compressor is “Du” (see configuration)
and one compressor has locked out, the control will
switch the call to the other compressor. If compressor
setting is “Si”, the control shall not switch the call to the
other compressor
Lead-Lag (only for TW122 units)
The Controller has the capability to lead-lag
compressors on a dual compressor unit.
The lead-lag between the compressors is active
only when both compressors are in use (and the
compressor setting is “Du”).
When the setting for lead-lag is other than 00,
compressor setting is “Du” and one compressor
has locked out; control will switch the call to the
other compressor and stop the timing for lead-lag.
The lead lag setting remains in the memory.
If control has called for the second stage three
times in a row, and compressor setting is “Du”;
regardless of the lead-lag setting control will switch the
call to the other compressor. The lead-lag timer is reset
and the lead-lag setting still applies.
Pump cycling
When ordered with the optional pump relay the
controller will cycle either the load, source or both
pumps with the compressor operation. Please see
the typical wiring diagram for details.
OPERATING INSTRUCTIONS
Please refer to figure # 12
Figure # 12
User Interface
The following parameters are displayed on the
screen:
• Control fluid temperature when in normal mode
• Settings within the configuration mode
• Individual operating mode temperature set points
• Fault display
UP Button:
• Press once to display the current set point
temperature.
• After current set point temperature is displayed,
pressing again will increment the set point 1
degree for every push. Pressing and holding the
up button will increment the set point at a rate of
4 degrees per second.
• When pressed with the down 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,
compressor, pump, and malfunction settings.
DOWN Button:
• Press once to display the current set point
temperature.
• After current set point temperature is displayed,
Blink Code
Fault Condition
ONE BLINK
High pressure circuit 1
TWO BLINKS
Low pressure circuit 1
THREE BLINKS
high pressure circuit 2
FOUR BLINKS
Low pressure circuit 2
To reset a unit after a hard lockout the user needs to
recycle power or switch the controller to the OFF
mode.
