40 TGZ 040A through TGZ 190A OMM TGZ-1
Changing the Unit Mode Set Point can be accomplished according to the following table.
NOTE: An “x” indicates that the value is ignored.
Control Source
Set Point
Mode
Input
Keypad Entry
BAS
Request
Available Modes
Set Point
Unit Mode
X X x x COOL COOL
X x x x COOL w/Glycol COOL w/Glycol
SWITCHES OFF x x COOL/ICE w/Glycol COOL w/Glycol
SWITCHES ON x x COOL/ICE w/Glycol ICE w/Glycol
KEYPAD x COOL w/Glycol x COOL/ICE w/Glycol COOL w/Glycol
KEYPAD x ICE w/Glycol x COOL/ICE w/Glycol ICE w/Glycol
NETWORK x x COOL COOL/ICE w/Glycol COOL w/Glycol
NETWORK x x ICE COOL/ICE w/Glycol ICE w/Glycol
X x x x ICE w/Glycol ICE w/Glycol
X x x x TEST TEST
Unit Test Mode
The unit test mode allows manual testing of controller outputs. Entering this mode shall
require the following conditions.
Unit Switch = OFF
Manager password active.
Available Unit Mode set point = TEST
A test menu can then be selected to allow activation of the outputs. It shall be possible to
switch each digital output ON or OFF and set the analog outputs to any value.
Circuit Available
A circuit is available if the circuit switch is in the on position and no circuit alarms are
active. Timers that delay startup or staging of a circuit do not render it unavailable.
Power Up Start Delay
After powering up the unit, the motor protector modules may not reset for up to 150
seconds. After the control is powered up, no compressor can start for 150 seconds. In
addition, the motor protect inputs are ignored during this time so as to avoid tripping a false
alarm.
Ice Mode Start Delay
An adjustable start to start ice delay timer will limit the frequency with which the chiller
may start in Ice mode. The timer starts when the first compressor starts while the unit is in
ice mode. While this timer is active, the chiller cannot restart in Ice mode. The time delay
is user adjustable.
The ice delay timer may be manually cleared to force a restart in ice mode. A set point
specifically for clearing the ice mode delay is available. In addition, cycling the power to
the controller will clear the ice delay timer.
Low Ambient Lockout
This feature is only available on air cooled units (WaterCooled=Off).
If the OAT drops below the low ambient lockout set point, then all running circuits will do
a normal stop. Once the lockout has been triggered, no compressors will start until the OAT
rises to the lockout set point plus 5°F.
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