Tjernlund 950-0484 User Manual

TJERNLUND PRODUCTS, INC.

1601 Ninth Street • White Bear Lake, MN 55110-6794
PHONE [phone] • [phone] • FAX [phone]
Visit our web site • www.tjernlund.com

P/N 950-0484 MAC-3 CIRCUIT BOARD REPLACEMENT KIT INSTRUCTIONS

FOR REPLACEMENT ON IN-FORCER MODELS PAI-3,4 WITH CIRCUIT BOARD BUILT IN

Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage.

1. Jumper wire provided must be installed on optional limit location if it is not being utilized.

2. Blue and Yellow wires from Fan Prover must be connected to Auxiliary Prover (3 & 4) contacts.

3. Red wires from High Limit must be connected to Auxiliary Limit (9 & 0) contacts.

4. Gray wires from Alarm Sequencer must be connected to Alarm Sequencer (5 & 6) contacts.
Black and White wires from Alarm Sequencer must be connected to Alarm Sequencer (7 & 8) contacts.

IMPORTANT: Jumper wire must be installed across H & PH terminals when IN-FORCER Fan Prover is wired into Auxiliary Prover (3 & 4)
contacts. It is not necessary to wire the Fan Prover in series with the H & PH terminals as shown in the MAC-3 Instructions enclosed when the
Prover is wired in series with the Auxiliary Prover (3 & 4) contacts. All Fan Provers must be wired in series with the H & PH or Auxiliary Prover
(3 & 4) contacts. Do not put jumper wire across H & PH terminals if Prover circuit is installed across those terminals.

FOR REPLACEMENT ON MAC-3 CONTROLLER

Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage.

1. Jumper wire provided must be installed on optional limit location if it is not being utilized.

2. Jumper wires provided must be installed on Auxiliary Prover terminals (3 & 4) and Auxiliary Limit terminals (9 & 0)
if they are not being utilized.

3. For detailed wiring see MAC-3 Instructions enclosed P/N 8504043.

MAC-3 CIRCUIT BOARD FEATURES

Aux. Limit switch in series with
optional limit on terminal strip

Optional Alarm Sequencer proves Fan
Prover Operation (not limit operation)

Used in conjunction with Optional Alarm
Sequencer

Optional Limit (Spill Switch)

115 VAC Proven “HOT” From Fan Prover

115 VAC Neutral To Inducer / Venter / IN-FORCER

115 VAC “HOT” To Inducer / Venter
/ IN-FORCER motor & Fan Prover

Auxiliary Operation Switch
(i.e. Manual or Gas Pressure)

115 VAC Input From Disconnect Switch

Aux. Prover contacts in series with H & PH
contacts on output terminals

Aux. Motor in parallel with H & N used for
additional Power Venter, Inducer, IN-FORCER

P/N: 8505009 ©2000 TJERNLUND PRODUCTS, INC. ALL RIGHTS RESERVED REV. 08/00

REV. A 5/99

TJERNLUND PRODUCTS, INC.

1601 Ninth Street • White Bear Lake, MN 55110-6794
PHONE [phone] • [phone] • FAX [phone]
Visit our web site • www.tjernlund.com

MODEL

MAC-3

MULTIPLE APPLIANCE CONTROL

For Interlocking one Power Venter, Draft Inducer

IN-FORCERTMor Damper with up to three burners

TABLE OF CONTENTS

Cautions ..........................................................................................................................................................................1

Electrical Wiring

Electrical Specifications & Circuit Board Features .....................................................................................................1

Output Power Venter, Draft Inducer, IN-FORCER & Damper Wiring Diagrams ....................................................2, 3

Burner Input Wiring Diagrams ...............................................................................................................................4, 5

Alternative Wiring Diagrams ..................................................................................................................................5, 6

MAC-3 Wired With up to Five Gas Burners and One Power Venter, Draft Inducer or IN-FORCER................5

MAC-3 Wired With a Power Venter or Draft Inducer and a Commercial IN-FORCER ....................................6

MAC-3 Circuit Board Schematic ....................................................................................................................................6

Replacement Parts & Warranty .......................................................................................................................................7

DESCRIPTION

The MAC-3 is used for wiring up to 3 heating appliances with a single Draft Inducer, Power Venter, IN-FORCER or 115V Damper. It
is suitable for both 24 VAC and 115 VAC control systems for gas and oil burners. Plug-in relays must be purchased separately
depending on control system voltage of appliance.

Use Tjernlund part # 950-1040 relay For 24 VAC control systems.
Use Tjernlund part # 950-0480 relay For 115 VAC control systems.

OWNER INSTRUCTIONS, DO NOT DESTROY

!

Recognize this symbol as an indication of important Safety Information!

THESE INSTRUCTIONS ARE INTENDED AS AN AID TO QUALIFIED, LICENSED
SERVICE PERSONNEL FOR PROPER INSTALLATION, ADJUSTMENT AND
OPERATION OF THIS UNIT. READ THESE INSTRUCTIONS THOROUGHLY
BEFORE ATTEMPTING INSTALLATION OR OPERATION. FAILURE TO FOLLOW
THESE INSTRUCTIONS MAY RESULT IN IMPROPER INSTALLATION, ADJUST­MENT, SERVICE OR MAINTENANCE POSSIBLY RESULTING IN FIRE, ELECTRI ­CAL SHOCK, CARBON MONOXIDE POISONING, EXPLOSION, OR PERSONAL
INJURY OR PROPERTY DAMAGE.

PLEASE READ CAREFULLY AND KEEP ON JOB

SITE FOR FUTURE REFERENCE.

Copyright © 1999, Tjernlund Products, Inc. All rights reserved. P/N 8504043

CAUTIONS

1. Failure to install, maintain and/or operate the MAC-3 in accordance with manufacturer’s instructions may result in conditions that
can produce bodily injury and property damage.

2. The safety interlock and system operation performance checks must be performed on each appliance interlocked with the
MAC-3 in accordance with the Power Venter, Draft Inducer, IN-FORCER or Damper installation instructions.

ELECTRICAL

All wiring from the MAC-3 to the appliance must be appropriate Class 1 wiring as follows: installed in rigid metal conduit, intermediate conduit,
rigid non-metallic conduit, electrical metallic tubing, Type MI Cable, Type MC Cable or be otherwise suitably protected from physical damage.

The disconnect means and circuit protection are to be provided by the installer of this device.

SEQUENCE OF OPERATION OF MAC-3 INTERLOCKED WITH 24 VAC & 115 VAC APPLIANCE CONTROL CIRCUITS

The circuit board of the MAC-3 is designed for a simple three wire interlock with up to three separate burners. Upon a call for heat the “hot”
leg of the burner circuit is intercepted and routed to the MAC-3 terminal strip. The MAC-3 is activated, the power venter, draft inducer,
IN-FORCER or damper starts. The proving switch makes and the intercepted “hot” leg is returned to the burner circuit, allowing the burner to
fire. Plug-in relays must be purchased separately depending on control system voltage of appliance.

Use Tjernlund part # 950-1040 relay For 24 VAC control systems
Use Tjernlund part # 950-0480 relay For 115 VACcontrol systems

ELECTRICAL SPECIFICATIONS TABLE

Appliance # 3
Interlock

Appliance # 2
Interlock

Appliance # 1
Interlock

MAC-3 CIRCUIT BOARD FEATURES

Aux. Limit switch in series with
optional limit on terminal strip

Optional Alarm Sequencer proves Fan
Prover Operation (not limit operation)

Used in conjunction with Optional Alarm
Sequencer

Optional Limit (Spill Switch)

115 VAC Proven “HOT” From Fan Prover

115 VAC Neutral To Inducer / Venter / IN-FORCER

115 VAC “HOT”To Inducer / Venter
/ IN-FORCER motor & Fan Prover

Auxiliary Operation Switch
(i.e. Manual or Gas Pressure)

115 VAC Input From Disconnect Switch

Aux. Prover contacts in series with H &PH
contacts on output terminals

Aux. Motor in parallel with H &N used for
additional Power Venter, Inducer, IN-FORCER

1