27
TEST FUNCTION — The test function operates the diagnos-
tic 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 fol-
lowed by the
key then scroll to the desired test by pressing
the down arrow key. Refer to Table 17 for a complete descrip-
tion 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 in-
clude loaders, minimum load valve, oil heater (if equipped),
motor cooling solenoids, oil pump, and oil solenoids. Similarly,
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 Motormaster
®
control
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 sec-
onds between each step when opening and closing for the valve
to stop moving. Pressing the down arrow will display Circuit B
EXV Valve and it is tested in the same manner as Circuit A.
Also available for test are Circuit A water valve (if equipped)
and the Circuit A and B Fan speed % (direct control Motor-
master device) outputs for 30GX chillers. 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 pages 74 and 75 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 appropriate
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 accessible
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 18.
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 compres-
sor. Refer to Table 19 for a complete description of the func-
tion. When the PSIO-1 module is replaced or downloaded 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 downloading
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 20 for a complete description of the function.
Cooling Set Point 1 and 2
Reset Set Points
External Signal Reset: 4 to 20 mA (2 to 10 vdc with
500 Ohm
1
/
2
watt resistor)
Demand Limit Set Points
Switch Input:
Step 1 — 0 to 100% Capacity Reduction
Step 2 — 0 to 100% Capacity Reduction
External Signal: Maximum Demand Limit 4 to 20 mA
(2 to 10 vdc with 500 Ohm
1
/
2
watt resistor)
Minimum Demand Limit 4 to 20 mA
(2 to 10 vdc with 500 Ohm
1
/
2
watt 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 oc-
cupied chilled fluid set point. Scroll down to Cool Set Point 2
and then to the Cooling Ramp load multiplier which is config-
urable 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. Cooling 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 20 for making changes to
these values.
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
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)
Maximum
Reset Range:
External
Temperature Reset:
Chiller Fluid
∆
:
–30 to 30 F
(–17 to 17 C)
–40 to 240 F
(–40 to 118 C)
0
°
to 15 F
(0
°
to 8 C)
ENTER
