Tjernlund MAC-4 User Manual

REV. A 4/00

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-4

MULTIPLE APPLIANCE CONTROL

For Interlocking Power Venters, Draft Inducers

IN-FORCERS or Dampers with up to four burners

TABLE OF CONTENTS

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

Electrical Wiring

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

Wiring to 24V Gas Equipment ...............................................................................................................................2, 3

Wiring to 115V Gas Equipment ..............................................................................................................................4, 5

Wiring to Millivolt Gas Equipment ..............................................................................................................................6

Wiring to Oil Equipment .....................................................................................................................................6, 7, 8

Safety Interlock Test ........................................................................................................................................................9

Replacement Parts & Warranty .......................................................................................................................................9

DESCRIPTION

The MAC-4 is used for wiring up to 4 heating appliances with Draft Inducers, Power Venters, IN-FORCERs or 115V Dampers. It is
suitable for any combination of 24 VAC and 115 VAC control systems for gas and oil burners.

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 © 2000, Tjernlund Products, Inc. All rights reserved. P/N 8504088

CAUTIONS

1. Failure to install, maintain and/or operate the MAC-4 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-4 in accordance with the Power Venter, Draft Inducer, IN-FORCER or Damper installation instructions.

ELECTRICAL

All wiring from the MAC-4 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-4 INTERLOCKED WITH 24 VAC & 115 VAC APPLIANCE CONTROL CIRCUITS

The circuit board of the MAC-4 is designed for a simple three wire interlock with up to four separate burners. Upon a call for heat the “hot”
leg of the burner circuit is intercepted and routed to the MAC-4 terminal strip. When the MAC-4 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.

ELECTRICAL SPECIFICATIONS TABLE

Disconnect electrical power to this control and to the heating appliances is serves before servicing.
Do not connect electrical power to prover block. Doing so will damage the MAC-4.
Do not connect more than one appliance to each appliance block. Doing so will damage the MAC-4.

MAC-4 CIRCUIT BOARD FEATURES

APPLIANCE # 1 INTERLOCK (J1B)

Terminal 1: 18-130 VAC intercepted
“hot” From Gas Valve or Burner Motor

Terminal 2: Neutral Return
Terminal 3: Used for special appli ca-

tions. Contact Factory for Diagram.
Terminal 4: Proven Hot Back to Gas

Valve or Burner Motor

1 HP MAX LOAD Terminals 3 & 4

NOTE:

Terminals 1 - 4 are the same for
Appliances 1, 2, 3 & 4

APPLIANCE # 2 INTERLOCK (J2B)

115 VAC POWER SUPPLY (J7)

115 VAC Input From Disconnect Switch.

MOTOR LOAD (J6)

115 VAC Output to Mechanical
Draft or Combustion Air Motor(s)

1 HP MAX LOAD.

PROVER (J5)

5 VDC Output to Fan Prover Switch.

5 VDC Board Generated Power.

DO NOT SUPPLY POWER TO
PROVER CONTACTS!

APPLIANCE # 4 INTERLOCK (J4B)

NOTE: Terminals 1-4 are in the reverse
order from Appliances 1 & 2.

1 HP MAX LOAD Terminals 3 & 4

APPLIANCE # 3 INTERLOCK (J3B)

NOTE: Terminals 1-4 are in the reverse
order from Appliances 1 & 2.

1 HP MAX LOAD Terminals 3 & 4

1 HP MAX LOAD Terminals 3 & 4

1

MAC-4 WIRED WITH 24V GAS APPLIANCES AND ONE TJERNLUND POWER VENTER,

DRAFT INDUCER, IN-FORCER OR 115V DAMPER (MOTOR LOAD UP TO 1 H.P.)

2

MAC-4 WIRED WITH 24V GAS APPLIANCES AND ONE TJERNLUND POWER VENTER,

DRAFT INDUCER, IN-FORCER OR 115V DAMPER WITH A 950-1067 POST-PURGE TIMER/RELAY

(VENTER MOTOR LESS THAN 4.4 AMPS)