Tjernlund CPC-2 Constant Pressure Controller (Discontinued) 8504091 Rev A 03/01 - Manual (Page 10)

Viewed on CPC-2 Display
DEFAULT DISPLAY IN AUTOMATIC MODE OF OPERATION
Display viewed when Venter is operating in automatic mode. Automatic mode is the default mode and is operational when not
running in Manual or Venter Only mode.
Viewed on CPC-2 Display
or Displays system set point and actual pressure at sampling point.
DEFAULT DISPLAY IN MANUAL MODE OF OPERATION
Manual Mode will allow system to operate as if you had a manual speed control regulating motor speed. If transducer or pressure
sampling location problems arise vent system can be operated in the Manual Mode at a reduced fixed speed until problem can be
solved. The transducer is ignored in the Manual Mode, but the Secondary Prover, i.e. PSA-1 still interlocks the heating appliances.
NOTE: Secondary Prover Switch to PROVER 1 or PROVER 2 on CPC-2 board is turned off to allow for adjustment and balancing of
vent system draft. The PSA-1 adjustable Fan Prover Switch is set from the factory with the make point at the maximum set point so
manual adjustment of the Fan Prover set point is necessary. After draft set point has been determined, adjust PSA-1 Fan Prover so
that it remains closed at determined vent system draft. Refer to Venter or PSA-1 installation instructions for installation and adjust-
ment of PSA-1 adjustable Fan Prover Switch.
IMPORTANT: You must go to Set Up Mode VENTER PROVER and select “ON” to acti-
vate Secondary Prover once its set point has been adjusted.
Viewed on CPC-2 Display
DEFAULT DISPLAY IN VENTER ONLY MODE OF OPERATION
Venter Only Mode is useful to check out the operation of the Venter / Inducer prior to interlock with appliances. Venter Only mode dis-
ables all interlocked appliances so they will not operate. Used to verify Venter / Inducer ramps up and down, all vent connections are
tight, Venter impeller operates freely and vent system operates smoothly.
Viewed on CPC-2 Display
or Displays % of motor speed and actual pressure at sampling point.
DISPLAYED MESSAGES DURING SYSTEM POWER-UP OF CPC-2
The CPC-2 will start up in Automatic mode and retain all previously saved settings when power is interrupted. The following sequence
will occur when the CPC-2 is initially powered up, any time power is interrupted and reestablished or when the manual reset button on
CPC-2 board is depressed.
NOTE: There is approximately a 10 second delay when power is reestablised before the following initial-
ization messages are displayed. The key pad can be unlocked when the initialization process is finished.
CPC-2 CPC -2 CPC-2
CPC-2 CPC -2 CPC-2
INITIALIZING PLEASE WAIT...
SYSTEM VERSION X.XX.XX
Each setting of the CPC-2 will be displayed in the following order.
PRE-PURGE : Displays Pre-Purge time setting (Factory default OFF)
POST PURGE: Displays Post Purge time setting (Factory default OFF)
VENTER SENSOR: Displays operating range of transducer (TD-1 is the only option, operational to -.75” W.C. or -187 Pa)
VENTER PROVER: Displays whether Prover 1, (Venter Fan Prover) is on or off (Factory default OFF)
COMB. AIR PROVER: Displays whether Prover 2, (Combustion Air Prover) is on or off (Factory default OFF)
VENTER: Displays whether exhaust Venter 1 is installed or not installed (Factory default INSTALLED)
COMBUSTION AIR: Displays whether Venter 2 for Combustion Air System is installed (Factory default NOT INSTALLED)
VENTER ONLY
XXX% -X.XX Pa VENTER ONLY
XXX% -X.XX InWC
V SET -X.XX Pa
V ACT -X.XX Pa V SET -X.XX InWC
V ACT -X.XX InWC
7
or
SET POST PURGE
XX min. 00 sec. SET PRE-PURGE
XX min. 00 sec.
Sets optional Venter / Inducer pre and post purge (up to 30 minutes). Pre-
Purge only happens on the 1st appliance call for heat and Post Purge only
happens when the last appliance call for heat is completed.
or
MANUAL MODE
XXX% -X.XX Pa MANUAL MODE
XXX% -X.XX InWC
Displays % of motor speed and actual vent pressure at sampling point if
transducer is connected and functioning.