TJERNLUND MAC-3 CONTROL (DISCONTINUED) 8504043 REV A 0599 User Manual

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

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

SITE FOR FUTURE REFERENCE.

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

OUTPUT POWER VENTER, DRAFT INDUCER, IN-FORCER & DAMPER WIRING WITH THE MAC-3

2

When wiring the MAC-3 with a Tjernlund Power Venter without a post-purge Timer/Relay only the Fan Proving Switch and motor
leads are utilized for wiring. If you are wiring with a post purge Timer/Relay see wiring on bottom of page 2. Our HSUL Series,
GPAK-J/1 Series and Commercial HS-3,4,5 Series utilize our part # 950-1040 relays which can be plugged into the MAC-3 for 24V
control systems. The HSUL-Series, GPAK-J/1 Series and model HS-5 include one part # 950-1040 relay. The models HS-3 and
HS-4 include two part # 950-1040 relays.

MAC-3 WIRED WITH A TJERNLUND POWER VENTER, DRAFT INDUCER, IN-FORCER OR 115V DAMPER

WITHOUT A POST-PURGE (VENTER MOTOR LESS THAN 9 AMPS)

MAC-3 WIRED WITH A TJERNLUND HST, GPAK-T SERIES POWER VENTER OR DRAFT INDUCER

WITH A 950-1067 POST-PURGE TIMER/RELAY (VENTER MOTOR LESS THAN 4.4 AMPS)

NOTE: The WHITE/BROWN wire from terminal 5 of the Timer/Relay is
ORANGE in the GPAK-T Series. The ORANGE wire from terminal 4 of
the Timer/Relay is BLUE in the GPAK-T Series.