Venmar V10 Guide de dépannage télécharger pdf (Page 23)

VCES-DDC-IOM-1C

Table D3: DDC Troubleshooting Guide

Problem Cause Solution

Exhaust fan will not turn on.

Unit is in recirculation defrost

(units equipped with recircu-

lation defrost).

BacStat will ﬂash ‘dF’ in upper left corner. Wait for defrost mode

to ﬁnish its timed sequence.

Unit is in unoccupied recircu-

lation

(units with recirculation

damper).

BacStat will show ‘UR’. Check if you have a contact closure

across 305 and 306.

Damper end switches are not

making.

Check your ﬁeld wires connected to PNL 310 and 311 for a

closed connection.

Damper will not open. Electrical supply interrupted.

Check wiring on damper actuator.

For the outside air damper actuator and recirculation damper

actuator (if equipped), measure a 24 VAC across PNL terminals

330 and 302.

For the exhaust air damper actuator, measure a 24 VAC across

factory wired terminals 332 and 302.

Supply fan will not turn on.

Unit is in exhaust defrost

(units equipped with exhaust

defrost).

BacStat will ﬂash ‘dF’ in upper left corner. Wait for defrost mode

to ﬁnish its timed sequence.

Damper end switches are not

making.

Check ﬁeld wires connected to PNL 309 and 310 for a closed

connection.

Additional Troubleshooting:

__ Verify DDC jumpers are correct.

__ Verify expander board jumpers and address (dip switch settings) are correct.

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Venmar V10 Guide de dépannage Page 23