Table of Contents
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(Inputs) — The factory/field test of inputs function dis-
plays the current sensor input value (analog type) or status
(discrete type). During the inputs portion of the quick test, the
compressors and fan motors will not operate.
(Analog outputs) — The factory/field test of analog
outputs causes the analog outputs to be cycled to specific out-
put values. Each output is disabled by selecting the next output
(press the
or
key).
To test inlet guide vanes or variable frequency drives:
1. Press
. The display will be ANLGOUT.
2. Press
once to scroll down. The display will read
IGV (inlet guide vanes test) (sizes 034-078) or INV
(inverter test) (sizes 088 and 104).
3. Press
to start the test. The supply fan will start and
ENTER
VFD will go from 0% speed (default position when
unit starts) to 50% speed or IGVs will go from 0%
open to 50% open.
4. Press
again to drive the VFD from 50% to 100%
ENTER
speed or IGVs from 50% to 100% open.
5. Press
again to change the VFD from 100% speed
ENTER
to 0% speed or IGVs from 100% open to 0% open.
NOTE: The VFD is configured such that at 0% speed com-
mand from the unit PIC control the supply fan VFD will run at
about 26 Hz. This will narrow the operating range and improve
the control stability.
6. Press
once to scroll down. The display will read
ECON (economizer test).
NOTE: The economizer, heating coil valve, and analog
humidifer tests operate in the same manner as the IGV test.
The PED (modulating power exhaust test) operates in a similar
manner except that the sequence of operation when pressing
the
key is zero to 75% speed (press
ENTER
100% speed (press
again), 100% to 20% speed (press
ENTER
again), and 20% to 0 speed (press
ENTER
(Discrete outputs) — The factory/field test of discrete
outputs enables the discrete outputs. Each output is disabled
when the next output is selected by pressing the
keys.
(Compressors) — The factory/field test of compressors
enables the supply-air fan and sets the inlet guide vanes or
variable frequency drives to 30% (if so equipped) when any
compressor is selected. During the compressor test, the com-
pressors will operate for ten seconds after the fan has been
enabled.
NOTE: The service valves must be open, and the crankcase
heaters should be energized for at least 24 hours before per-
forming the compressor tests.
Once a compressor is operated using the test function, it is
not allowed to operate again for 30 seconds. The supply-air fan
and inlet guide vanes or variable frequency drives (if so
equipped) are not disabled until the compressor test is exited.
(Heat) — During the factory/field test of heat, the sup-
ply-air fan is enabled. As the fan starts, the inlet guide vanes
variable frequency drives are set to 30% open (if so equipped).
The heat interlock relay contacts are switched when any stage
of heat is selected. The test delays approximately 11 seconds
once), 75% to
ENTER
again).
ENTER
or
87
after the fan is enabled and prior to energizing the first selected
heat stage.
NOTE: Any selected heat stage causes that stage to be selected
and all other stages will be disabled. The supply-air fan, vari-
able frequency drives (if so equipped), and heat interlock relay
are NOT disabled until the heat test is exited.
(Exit Test) — In order to exit the factory/field test
mode, press
. TST CMPL is displayed, and the expansion
ENTER
of TST CMPL (press
) indicates that the quick test has
ENTER
been terminated.
Forcing Values —
The control unit allows service person
to input (or force) values into set points for troubleshooting. By
forcing values in submaster reference loops or input channels,
the service person can force the unit control to respond to dif-
ferent situations which may not occur normally at that time. In
this way, operation of the unit and control can be tested. The in-
put channels where forced values are permitted are identified in
the directory tables.
To override an input channel or submaster reference, use the
HSIO to display the current value. Type in the override value
and press the
key. If the override value is within the allow-
ENTER
able range, the value will be accepted. No action will occur if
the value is outside the acceptable range for that variable.
The override is removed by pressing the
mal system value will be restored.
SERVICE
History Function —
The history function allows the
user to look at unit operational information. See Table 67.
(Alarm history) — This subfunction allows the user to
view the last 9 alarm codes and their descriptions. The latest
(newest) alarm is listed first, followed in succession by next
older alarms. When a new alarm is generated, it is listed at the
top, displacing all earlier alarms down one position, and the
last (oldest) alarm is deleted from the display. Alarms are
retained during a loss of power.
(Maintenance history) — The maintenance history
subfunction displays the latest service date. A service techni-
cian can enter a new service date through the HSIO keypad.
The entry of a service date shall be password protected. See
Service Function section below for more details. The last 2 ser-
vice dates are displayed at the building supervisor.
Service Function —
The service function allows the
user to view and modify the unit configuration files. Factory,
field, and service configuration data may be viewed, changed,
and/or entered through the keypad and display module. See
Table 68.
(Log on/Log off) — The service function is
word protected by a non-changeable password. To log
on, press
and the display will read LOG ON.
Press
and the display will change to
ENTER
LOGGEDON. At this time, configurations may be viewed or
modified. To log out, press
will read LOGD OFF.
(Software version) — This subfunction allows the
user to view information about the software, such as the ver-
sion number and language options.
key. The nor-
CLEAR
pass-
and the display
ENTER
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Table of Contents
Troubleshooting
