Certified Drawing
IM 613 / Page 15 (Rev. 7/99)
5. Check for proper voltage levels at the Comm B port.
Use a DC voltmeter to test the voltage levels at the Comm
B terminals with respect to ground. The terminals and
acceptable voltage ranges are specified in Table 8.
If the voltage levels are acceptable, connect the IDC
connector to the Comm B port.
If no voltage or improper voltage levels are found, the UVC
is defective and must be replaced.
6. Verify that the unit ventilator is operating in accordance with
its sequence of operation as outlined in the appropriate
documentation (refer to Table 6).
Since the sensed temperatures are fixed at any given
moment, adjust the room setpoint and unoccupied offset
pots to obtain the expected heating or cooling control
actions. If a PC is available, adjust any other applicable
parameters to obtain the expected UVC control actions.
7. Check for remote setpoint adjustment pot operation (if
present). Verify that the expected UVC control action
occurs when the remote pot is adjusted up or down.
8. Check that the ventilation lockout option works properly
(if present).
When the unit is in the occupied operating mode, verify
that the OA damper closes when the ventilation lockout
relay is energized.
Verify that the OA damper opens when the exhaust fan
interlock relay is energized.
9. Check that the fan interlock option works properly (if
present).
Verify that the OA damper opens when the exhaust fan
interlock relay is energized.
To Check Existing Slave UVC
1. Verify that the main power switch is at “Off.”
2. Set the network address.
Each slave must have a unique hex address. Begin by
setting the first slave’s address to “01.” (This is a “level 3”
network address.) Address each subsequent Slave in
consecutive order (02, 03, 04, 05). For further information,
refer to “Hex Switches” in the “Component Data” section of
this manual.
3. Apply power to the unit.
Turn the main power switch to “On” and the motor speed
switch to desired speed, wait 5 minutes until calibration is
complete.
4. Check the status LED.
The status LED should illuminate after calibration. If a wall
sensor package is used, the remote status LED should also
illuminate.
Verify that the slave’s status LED indication matches the
master’s indication, regardless of the operating mode.
If the status LED is flashing in a 16-blink sequence, the
slave is not communicating with its master. Refer to “Test
Procedures” in the “Service Information” section of this
manual.
5. Check for proper voltage levels at the Comm B port.
Use a DC voltmeter to test the voltage levels at the Comm B
terminals with respect to ground. The terminals and accept-
able voltage ranges are specified in Table 8.
If the voltage levels are acceptable, go on to step 6.
If no voltage or improper voltage levels are found, the UVC
is defective and must be replaced.
6. Check for proper voltage levels at the communication port
IDC connector.
Use a DC voltmeter to test the voltage levels at the
connector terminals with respect to ground. Test at the
connector terminals corresponding to the communication
port terminals listed in Table 8. Verify that the voltages are
within the ranges specified in the table.
If the voltage levels are acceptable, connect the IDC
connector to the Comm B port.
If no voltage or improper voltage levels are found, verify that
the master UVC is energized and that the communications
trunk wiring is intact.
7. Verify that the unit ventilator is operating in accordance with
its sequence of operation as outlined in the appropriate
documentation (refer to Table 6).
Since the sensed temperatures are fixed at any given
moment, adjust the UVC heating and cooling setpoints to
obtain the expected heating or cooling control actions. This
can be accomplished either by adjusting the pots at the
master or by disconnecting the communications cable and
adjusting the pots at the slave. (If the latter option is chosen,
be aware that the status LED will indicate a 16-blink
communication failure alarm.)
If a PC is available, adjust any other applicable parameters
(at the slave) to obtain the expected UVC control actions.
8. Check that the ventilation lockout option works properly
(if present).
When the unit is in the occupied operating mode, verify that
the CA damper closes when the ventilation lockout relay is
energized.
9. Check that the exhaust fan interlock option works properly
(if present).
Verify that the CA damper opens when the exhaust fan
interlock relay is energized.
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