Tjernlund CPC-3 Constant Pressure Controller Startup Manual 8504125 - Manual (Page 17)

VIEWING AND RESETTING FAULT HISTORY
The CPC-3's fault history can be viewed for troubleshooting. The CPC-3 is shipped from the factory with no faults in the fault register.
To examine the fault register, press the ENTER key while the “FAULT HISTORY” option is displayed. Once entered, the fault register
will display the last fault that occurred. The INCREASE key will display the last 5 faults with the 5th fault being the oldest and the 1st
fault being the most recent. If the INCREASE key is continually pressed, after the 5th fault there is a "CLEAR ALL FAULTS" option. If
the SAVE SETTING key is pressed with this option displayed, all faults will be cleared and the fault register will be emptied. To exit
out of the fault register, press the ENTER key.
SET STAGES
The “SET STAGES” option was developed so the end user could lock out heater calls from triggering the CPC-3. For example, if the
#1 and #2 heater was being serviced and needed to be taken offline, it could be performed within the CPC-3 Control by setting the #1
and #2 heater stage to OFF. While viewing the “SET STAGES” option, press the ENTER key to enter this option. In this option, the
bottom display line will note the condition of all of the heater stages. “ALL ON” means all of the Heater stages are active and any call
will trigger the CPC-3 into action. “ALL OFF” means all of the Heaters are not active and no call for heat will put the CPC-3 into
action. “ALL ***” means one or more of the stages is set to “OFF” so a call for heat from that heater will not activate the CPC-3. To
change all of the heater stages from all on or all off, press the SAVE SETTING key while in this option. Each individual heater stage
can be changed as well. While in the “SET STAGES” option, use the INCREASE and DECREASE key to scroll through all 16 avail-
able heater Stages. Each heater stage can be turned “OFF” or “ON” by pressing the SAVE SETTING key. We recommend that each
heater stage that is not being used be set to the “OFF” condition. This action will help keep additional heaters from being added to the
system without further investigation of the Mechanical Vent Systems Volume limitations.
INTERLOCK VERIFICATION
With the Key pad “Open”, press the OPTIONS key and the options menu will be viewable. Scroll through the list of available options,
using the INCREASE key until “SET STAGES” is in the display window.
SET STAGES: “SET STAGES” can be used to verify that all heaters being served are interlocked properly. While viewing “SET
STAGES”, press the ENTER key to enter this option. In this option, the bottom display line will note the condition of all of the heater
stages. “ALL ON” means all of the Heater stages are active and any call will trigger the CPC-3 into action. To globally change all of
the heater stages from all on or all off, press the SAVE SETTING key while in this option. Activate each heater and verify that the cor-
responding Amber BURNER STATUS light illuminates and that the burner does not fire.
Do not continue to operate a heater where the burner operates with the SET STAGES "ALL OFF" option selected. Investigate inter-
lock wiring to determine problem and rewire so that the CPC-3 is wired in series prior to the burner circuit.
While still in the SET STAGES option, use the INCREASE and DECREASE keys to scroll through all 16 available heater Stages.
Each heater stage can be Turned OFF or ON by pressing the SAVE SETTING key. We recommend that each heater stage that is not
being used be set to the "OFF" condition. This action will help keep additional heaters from being added to the system without further
investigation of the Mechanical Vent Systems Volume limitations.
SETTING PRE-PURGE/ POST PURGE TIMES:
Pre-Purge is the amount of time the Inducer / C.A. Blower runs from the point a call for heat is sensed to the point in which the
heaters are to fire. Post Purge is the amount of time the Inducer / C.A. Blower runs after the last call for heat is removed. The Factory
default setting for Pre-Purge / Post Purge is 00 Minutes and 00 Seconds. To adjust, unlock the Key Pad, activate the Draft and / or
Combustion Air, and be in the Set Up menu. Once in the setup menu, simply press the PRE-PURGE or POST PURGE key. PRE-
PURGE or POST PURGE
00m 00s will be shown on the bottom line of the display. The arrow shows which area is ready for
adjustment, 00m = 00 minutes and 00s = 00 seconds. Use the INCREASE and DECREASE keys to adjust the desired minutes. Press
the ENTER key and the arrow will move to the seconds. Use the INCREASE and DECREASE keys to adjust the desired seconds.
Press the SAVE SETTING key to store settings. The Pre-Purge & Post Purge settings are used for both the Draft and Combustion Air
Systems, in Manual and Automatic Mode.
MANUAL MODE OPERATION AND PSA-1 FAN PROVER SWITCH ADJUSTMENT
PSA-1 MANUAL MODE FAN PROVER SAMPLING TUBE INSTALLATION LOCATIONS
VSAD & VSUB SERIES INDUCERS/BLOWERS FOR DRAFT:
If the CPC-3 set point is at least -0.10” w.c. use the included plastic tee to sample at the same point as the TD-2 transducer. If the
system set point is less than -0.10” w.c., install sampling tube after heater closest to Inducer and as close as practical to inlet of induc-
er/blower keeping 2-3 pipe diameters away from any elbow or “T”. Sensing tube should just penetrate inside wall of vent.
VSUB SERIES BLOWERS FOR “OPEN” & “SEALED” COMBUSTION AIR:
Install sampling tube in blower discharge, bending tubing 90º so that the open end points directly
toward the blower discharge, See Diagram D.
16
FACE SAMPLING
TUBE INTO AIR
STREAM
DIAGRAM D