Specifications

TEST FUNCTION — The test function operates the diag-
nostic program. To initiate the test function, the LOCAL/
OFF/REMOTE switch must be in the OFF position.
To reach a particular test, press its subfunction number
followed by the key then scroll to the desired test by
pressing the down arrow key. Refer to Table 14 for a com-
plete description of the test function.
To start a test of discrete outputs, press . To end
the test, simply press the key or press . Pressing
the key after a test has started advances the system to
the next test, whether the current test is operating or has timed
out. Circuit A discrete outputs can be tested in and
include loaders, minimum load valve, oil heater (if equipped),
motor cooling solenoids, oil pump, and oil solenoids. Simi-
larly, Circuit B discrete outputs can be tested in
.Additional discrete outputs, including condenser fans,
cooler heater, water pumps, and remote alarms can be tested
in .
Press to access Valves and Motormastert device
analog outputs. Scroll down to display Circuit A EXV Valve
with a target percent of 0%. Press to step the EXV
to 25%. Pressing three additional times will move
the EXV to 50%, 75%, and 100%. The EXV may be closed
in 25% steps by pressing for each desired step. Wait
30 seconds between each step when opening and closing for
the valve to stop moving. Pressing the down arrow will dis-
play Circuit B EXV Valve and it is tested in the same man-
ner as Circuit A. Also available for test are Circuit A water
valve (if equipped) and the Circuit A and B Fan speed %
(direct control Motormaster device) outputs for 30GX chill-
ers. These are tested in the same manner as the EXV valves.
Note that condenser fan motors are NOT started during fan
speed quick tests. Measure 4 to 20 mA dc output using meter
in series with violet wire to controller. See page 72 of Field
Wiring section.
While the unit is in test, you can leave the test function
and access another display or function by pressing the ap-
propriate keys. However, a component that is operating when
another function is accessed remains operating. You must
re-enter the test function and press to shut down the
component. Components with a timed operating limit time
out normally even if another function is accessed.
Since the Test function checks only certain outputs, it is
a good practice to also check all inputs and outputs acces-
sible through the status function. These can be located by
pressing through . If keypad is not used for
10 minutes, the unit automatically leaves the test function
and resumes the normal rotating display. See Table 15.
HISTORY FUNCTION — Pressing displays total
machine operating hours. Scroll down to display machine
run time and starts, and total run time and starts for each
compressor. Refer to Table 16 for a complete description of
the function. When the PSIO-1 module is replaced or down-
loaded with Version 4.0 or later software, the number of starts
and run hours may be changed one time. Record the current
values from the PSIO before removing the module or down-
loading new software. The number of starts and hours may
be changed by entering the desired value at the HSIO and
pressing the key.
Pressing displays the last 10 alarms along with a
description and time and date of occurrence of each alarm.
SET POINT FUNCTION — Set points are entered through
the keypad. Set points can be changed within the upper and
lower limits, which are fixed. The ranges are listed below.
Refer to Table 17 for a complete description of the function.
Cooling Set Point 1,2
Water:
Medium
Temperature Brine:
Low
Temperature Brine:
38 to 70 F
(3.3 to 21.1 C)
14 to 70 F
(−10 to 21.1 C)
−13 to 70 F
(−25 to 21.1 C)
Reset Set Points
Maximum
Reset Range:
−30 to 30 F
(−17 to 17 C)
External Temperature
Reset:
−40 to 240 F
(−40 to 118 C)
Chiller Fluid D:
0° to 15 F
(0° to 8 C)
External Signal Reset: 4 to 20 mA (2-10 vdc with
500 Ohm resistor)
Demand Limit Set Points
Switch Input: Step1—0to100% Capacity Reduction
Step2—0to100% Capacity Reduction
External Signal: Maximum Demand Limit 4 to 20 mA
(2-10 vdc with 500 Ohm resistor)
Minimum Demand Limit 4 to 20 mA
(2-10 vdc with 500 Ohm resistor)
Loadshed Demand Delta: 0 to 60%
Maximum Loadshed Time: 0 to 120 min.
Head Pressure Set Points
Air cooled chillers (30GX): 80 to 135 F (26.7 to 57.2 C)
Water cooled chillers (30HX): 80 to 128 F (26.7 to 53.3 C)
Set Point Table — The unit operating set points can be found
under . Use the down arrow key to scroll through
the set points. The first set point is Cool Set Point 1. This is
the occupied chilled fluid set point. Scroll down to Cool Set
Point 2 and then to the Cooling Ramp load multiplier which
is configurable from 0.2 to 2.0° F/min. (0.11 to 1.1° C/min.).
This value is the maximum rate at which the leaving fluid
temperature is allowed to drop without adding a stage. Cool-
ing Set Point 2 is used in conjunction with the dual set point
switch function. This is used as the low temperature set point
for ice duty or as the unoccupied set point. Press the down
arrow key to display the Circuit A and B head pressure set
points. The remaining set points in this subfunction include
demand limit, LCW (leaving chilled water) delta alarm limit,
minutes off time, and motor temperature set point.
Display Units — Press to display the units of mea-
sure being used. Type 0 is for English and type 1 is for
Metric.
Address — For CCN configurations, press and
scroll down to display the address and bus number of the
chiller.
Time — Press and scroll down to read and change
the unit day of week, time, day of month, month of year and
year of century. See the examples in Table 17 for making
changes to these values.
CCN Enable/Disable — Press to disable the CCN
control of the chiller. This function will override CCN con-
trol commands. The CCN Enable value under must
be ON to activate this function. With CCN Enable set to ON
and Disable CCN Control set to ‘‘0,’’ the chiller will func-
tion normally under CCN control. With Disable CCN Con-
trol set to ‘‘1,’’ the chiller will operate in a local mode under
its own control.
Reading and Changing Set Points — Table 18 shows how
to read and change the chilled fluid set point. Other set points
can be changed by following the same procedure. Refer to
Table 17 for the sequence of display of set points in each
subfunction.
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