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Table 15 — PE VFD Set Point (Frequency
Command) for Building Pressure
START UNIT
To start unit:
1. Close the unit-mounted ON/OFF switch (located in the
main control box).
2. Close the field-supplied and -installed timeclock (or con-
trol) switch (contacts located at Terminals 1 and 2 (TB3
for 034-048, TB4 for 054-104).
3. Initialization mode begins (see Operating Information
section on page 34 for complete description of sequences
and display codes).
4. Run Quick Test. If the display button is pressed during
the initialization mode period, the unit will run its self-
diagnostic routine. When this is in effect, an 88 will ap-
pear in the display screen. Refer to Quick Test Program
section below, for instructions on completing the Quick
Test program.
Quick Test Program —
Turn on power to unit.
The quick test program utilizes the 2-digit LED display (see
Fig. 6) on the set point board to show status of all input and
output signals to microprocessor. Display action and quick test
procedures are described below.
The quick test program is a 33-step program that provides a
means of checking all input and output signals of controls prior
to unit start-up. This check ensures that all control options,
thermistors, and control switches are in proper working order.
When unit control circuit is switched to Occupied mode, a
20 will appear on the display. Immediately press display button
once. An 88 will appear on the display and alarm light on
display board will be energized. This indicates that control sys-
tem is ready to run quick test program.
For each step of the 33-step program, display button must
be pressed twice. On first press, step number is displayed;
second press initiates required action and appropriate code is
displayed.
NOTE: The step number is a numeral followed by a decimal
point (a 2-digit number has a decimal point after each
numeral). The action code number is one or 2 digits with no
decimal point(s).
To recheck any step in quick test program, control must be
recycled by turning unit control switch off for a few seconds,
and then turning it back on again. Restart quick test program as
described above and proceed through quick test steps. Press
display button twice for each step until step to be rechecked is
reached.
The quick test program is divided into 3 sections as de-
scribed below and shown in Tables 16-18.
1. Quick Test Steps 1.-1.3. — Unit Configuration and
Switch Check
The microprocessor in unit control system is pro-
grammed by 2 switch assemblies located on processor
board (Fig. 1). The configuration header is factory set and
cannot be changed in the field. The DIP switch assembly
contains 8 microswitches that must be set in accordance
with the various options selected by the customer. All
DIP switches should be checked and set to proper posi-
tion for options selected prior to the quick test. See Con-
figuration of Header and DIP Switch Assembly section
on page 5 for factory switch settings. The DIP switch
functions and display codes are shown in Table 16.
2. Quick Test Steps 1.4.-2.3. — Thermistor and Set Point
Potentiometer Check
In these steps, the microprocessor checks resistance val-
ues of all sensors and set point potentiometers to ensure
that they are functional, connected properly, and set with-
in proper range for unit configuration.
Nominal resistance values for all sensors range from
363,000 to 219 ohms in accordance with Table 19. Nor-
mal display code for good sensors and potentiometers
is 1. A display code of 0 indicates a faulty potentiometer,
thermistor or wiring. A 0 display also indicates that op-
tion is not being used.
Table 17 shows thermistor and set point potentiometer
functions and quick test display codes.
PRESSURE
(in. wg)
VFD
SET POINT
(Hz)
CONTROL
SIGNAL
(mA)
PRESSURE
(in. wg)
VFD
SET POINT
(Hz)
CONTROL
SIGNAL
(mA)
0.50
0.0 4.00
0.00
30.0 12.00
0.45
3.0 4.80
–0.05
33.0 12.80
0.40
6.0 5.60
–0.10
36.0 13.60
0.35
9.0 6.40
–0.15
39.0 14.40
0.30
12.0 7.20
–0.20
42.0 15.20
0.25
15.0 8.00
–0.25
45.0 16.00
0.20
18.0 8.80
–0.30
48.0 16.80
0.15
21.0 9.60
–0.35
51.0 17.60
0.10
24.0 10.40
–0.40
54.0 18.40
0.05
27.0 11.20
–0.45
57.0 19.20
–0.50
60.0 20.00
IMPORTANT: The field-supplied and installed switch
(or timeclock) MUST BE CLOSED to put unit in
Occupied mode. Unit WILL NOT START until this is
accomplished.
IMPORTANT: The field-supplied switch (or timeclock)
must be closed to put unit into the occupied mode.
IMPORTANT: Do not allow unit control circuit to
remain energized with 20 showing on display for more
than 2 minutes. If display button is not pressed within
this time period, control will attempt to start unit.
IMPORTANT: Once quick test is initiated, display but-
ton must be pressed at least once every 10 minutes for
control to remain in Quick Test mode. If button is not
pressed within this time, control will attempt to start the
unit.