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Description

The CPC-3 is a microprocessor-based control that can simultaneously
control both draft and/or combustion air pressures. It typically controls
the operation and speed of an Auto-Draft® Inducer and/or a Universal
Blower to maintain draft or pressure set points. A third function provides
for an interface with a motorized louver. The CPC-3 also serves as the
safety interlock with associated burner controls.

Features

The CPC-3 has an 80 character vacuum florescent display that pro-
vides real-time system status and a soft touch keypad. All primary func-
tions can be programmed via distinct buttons, eliminating scrolling
through multiple screens. Included are four burner interlock terminal
strips that can interface with millivolt, 24 Volt, 115 Volt or 230 Volt burn-
er control circuits. The addition of up to three EXP-4E Expansion
Modules allows up to 16 separate burners to be interlocked. LED sta-
tus indicators on the face of the keypad show which interlocked burner
is calling for heat and when the CPC-3 safety circuits approve burner
operation. Additional LED's indicate venter limit(s) status and VFD
operation and fault status. Correct venter rotation can be determined by
display prompts and changed through a dip switch on the circuit board.
Included quick connect cabling completes all control circuit connections
between the CPC-3 and VFD. Features system fault diagnosis with
date and time reference for easy troubleshooting. Built in alarm alerts
building maintenance personnel if system faults. Alarm relay also
allows interface with building management system.

Programming Options 

Draft Pressure Set Point, Combustion Air Pressure Set Point, Pre and
Post purge, Automatic or Manual operation. Combustion air modes of
operation include “Open” room pressure or ducted “Sealed” pressure
for sealed combustion burners.

Operation

Upon a call for heat from an interlocked burner the CPC-3 references
the vent system draft and/or combustion air pressure as measured by
the TD-Series Pressure Transducer(s) and activates the Variable
Frequency Drive. The VFD quickly speeds up the inducer/blower until
the vent system draft and/or combustion air set point is reached. When
the set point is reached the CPC-3 completes the circuit to the inter-
locked appliance allowing the normal firing sequence to resume.
Additional burner stages will create a momentary decrease in vent sys-
tem pressures, causing the inducer/blower to speed up to maintain the
set point. If sufficient natural draft and/or combustion air is present the
CPC-3 will deactivate the inducer/blower until it is needed. The inter-
locked burners will be deactivated if the vent system draft set point can-
not be maintained within 0.01" w.c. during predefined time limits based
on combustion air or draft modes of operation.

Material

The housing is made from 18 gauge aluminized steel and is painted
with an industrial powder coating. It has NEMA class 1 construction.

Listings

ETL Listed # 56826

UL508 - Standard for industrial control equipment

CSA C22.2 No. 14-95 - Standard for industrial control equipment

Warranty

2 year warranty

13.6"

15.5"

2.6"

SIDE VIEW

FRONT VIEW

IMPORTANT: FOR “OPEN”
COMBUSTION AIR APPLICA-
TIONS WHERE THE CPC-3 IS
CONTROLLING THE MECH-
ANICAL ROOM PRESSURE. 

The system will not maintain
room pressure unless doors
have sweeps and all obvious
voids to spaces outside the
mechanical room are sealed.

Tjernlund Products, Inc. • 1601 Ninth Street • White Bear Lake, MN 55110 • (651) 426-2993 • (800) 255-4208 • FAX (651) 426-9547 • www.tjernlund.com

P/N 8513016 

FIGURE 8067002  7/26/04

+0.15 to -0.60 In WC / +37 to -159 Pa

0.0002 In WC / 0.05 Pa

32° to 122° F / 0° to 50° C

Combustion Air Range of Operation

Pressure Tolerance

Operating Temperature

+0.15 to -0.60 In WC / +37 to -159 Pa

Inducer Range of Operation

Sensor Supply

4 each 24 VDC, 420 mA total

Control Signal

2 each 0 - 10 VDC, 10 mA each

Power Supply

95 - 265 VAC / 47 - 440 Hz / 0.5 Amp

General Purpose 20 A, 240 VAC

Alarm Relay

2 A, 125 VAC

CPC-3 CONTROLLER

Appliance / Pump / AUX Relays

Dimensions, H x W x D

Weight

9.5 lbs / 4.3 kg

15.5 x 13.6 x 2.6 in
394 x 345 x 66 mm

5 each 0 - 10 VDC, 0.25 mA each

1 Digital Input
1 Digital Output

Motor:

+0.10 to -0.10 In WC / +24 to -24 Pa

  2 HP, 250 VAC

Open System:
Sealed System:

3.4 - 5.0 VDC, 24 mA max

3.4 - 5.0 VDC, 24 mA max

 1 HP, 125 VAC

Sensor:

Drive:

115 / 208-230 / 50 - 60 Hz / 0.5 Amp

Submitt

Submitt

al Dat

al Dat

a Sheet

a Sheet

CPC-3 CONST

CPC-3 CONST

ANT 

ANT 

PRESSURE CONTROLLER

PRESSURE CONTROLLER

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Page 210: ...til the vent system draft and or combustion air set point is reached When the set point is reached the CPC 3 completes the circuit to the inter locked appliance allowing the normal firing sequence to resume Additional burner stages will create a momentary decrease in vent sys tem pressures causing the inducer blower to speed up to maintain the set point If sufficient natural draft and or combustio...

Page 211: ...0 230 208 230 Volt Single or 3 Phase 1 HP 5 0 VFD 1H1A104C3 VSAD10 460A 460 Volt 3 Phase 1 HP 3 4 VFD 2H1A122C3 VSAD12 230 208 230 Volt Single or 3 Phase 2 HP 8 0 VFD 2H1A124C3 VSAD12 460A 460 Volt 3 Phase 2 HP 3 4 VFD 1 2H1A82O3 VSAD8 230 208 230 Volt Single or 3 Phase 1 2 HP 3 0 VFD 1 2H1A84O3 VSAD8 460A 460 Volt 3 Phase 1 2 HP 1 2 VFD 1H1A81O3 VSAD8 230 115 VAC input 230 Volt 3 Phase Output 1 H...

Page 212: ... boiler room from temperature extremes It is used with Tjernlund Series Commercial Combustion Air Systems The FFP 1 is designed to disrupt power to a combustion air supply blower in the event of a boiler room fire or an extended period where frigid outdoor air supply could cause pipes to freeze Do not wire an FFP 1 into a flue gas exhaust system or interuption of the exhaust system may occur if bo...

Page 213: ...f junction box with 4 conduit Square to round vent pipe adapter PSA 1 Fan Proving Switch FFP 1 Freeze and Fire Protection Limit FFP 1 For combustion air applications only Condensate drain kit Optional Controls CPC 3 Constant Pressure Controller IPS 1 Indoor Pressure Sensor decorative cover fittings TD 2 Pressure Transducer 0 15 to 0 60 w c For draft or Sealed ducted sealed combustion air sensing T...

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