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.
1
ELECTRICAL SPECIFICATIONS TABLE
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 applica-
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 # 3 INTERLOCK (J3B)
NOTE: Terminals 1-4 are in the reverse
order from Appliances 1 & 2.
1 HP MAX LOAD Terminals 3 & 4
APPLIANCE # 4 INTERLOCK (J4B)
NOTE: Terminals 1-4 are in the reverse
order from Appliances 1 & 2.
1 HP MAX LOAD Terminals 3 & 4
PROVER (J5)
5 VDC Output to Fan Prover Switch.
5 VDC Board Generated Power.
DO NOT SUPPLY POWER TO
PROVER CONTACTS!
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.
APPLIANCE # 2 INTERLOCK (J2B)
1 HP MAX LOAD Terminals 3 & 4
MAC-4 CIRCUIT BOARD FEATURES
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.
