Installation, Operation and Maintenance 5 - 29
Where [event] is one of the following:
Any assignment change must be confirmed by
pressing <Enter>.
NOTE: the particular annunciator relay on the chiller
module will energize when the assigned event is true
i.e. when that mode is present for 20 minutes or more
or diagnostic type is active. The category “none” is
provided to allow a relay to be turned off or defeated,
as well as to document to Tracer that a given relay is
not being used. However, the defaults are set to
assign each of the relays according to the most
common usage. For chiller Limit Mode assignment
only, the following limits will apply: Current, Soft Load
Current, and Phase Unbalance Limits.
NOTE on Relay Ratings: Contact loads shall not
exceed 120 VAC/240 VA. Minimum premissable load
is 100 mA, 5 VDC. See Interconnecting Wiring (Field
Wiring Required) in Section 3.
Refrigerant Pressure Analog Output Option
Possible values for status are % HPC [ROM default],
or delta. If %HPC is set, the optional analog pressure
output (see electrical drawings for Options Module
connections) will present a voltage in proportion to
the condenser pressure as a percent of the High
Pressure Cutout setting in absolute pressure.
If “delta” is selected, the output voltage will be linear
with the endpoints defined by th following two menu
items:
NOTE: this function does not use actual measured
pressures, but rather temperature sensor readings
and assumes sturated conditions for R134a
refrigerant.
Figure 32
Condenser Pressure Analog Output
Min Delta Pressure Calibration
The following will be displayed only if the “refrigerant
pressure analog output option” is set to “delta.”
The range of values shall be 0-400 Psid (0-2758
kPa) in increments of 1 Psid/kPa. The ROM default is
0 Psid (0 kPa). 6.8948 kPa = 1 Psi.
Relay #2: [event]
Press (+)(-) to Change Setting
Relay #3: [event]
Press (+)(-) to Change Setting
Not Used
Compressor Running (ROM Default for Programmable Relay
#1)
MMR Diagnostics
MAR Diagnostics
MMR & MAR Diagnostics (ROM Default for Programmable
Relay #2)
Chiller Limit Modes (ROM Default for Programmable Relay #3)
(20-minute filter applied).
Rfgt Pressure Output Option: [status]
Press (+)(-) to Change Setting
Min Delta Press Calib (2 VDC) XXXX PSID
Press (+)(-) to Change Setting
0
1
2
3
4
5
6
7
8
9
10
0100
0
1
2
3
4
5
6
7
8
9
10
0100
VDC
VDC
0 psia
0 percent
HPC in psia
100 percent
Min. Delta P Setting Max. Delta P Setting
Condenser Pressure analog Output with “%HPC” selected
Condenser Pressure analog Output with “Delta” selected
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