MAC4E OPERATION
The MAC4E is used in conjunction with the UC1 Universal Control to interlock up to four additional 24 VAC, 115 VAC or millivolt (Dry Contact)
controlled appliances. It activates the Venter through its connections to the UC1 and in turn relies on the UC1 Fan Prover safety circuit (P1 & P2)
to allow its interlocked appliances to operate. Any pre/post-purge settings on the UC1 will be defaulted to the MAC4E. Two LEDs for each appli-
ance interlock block are provided on the MAC4E. LEDs #1, 3, 5, 7 (AMBER) shows an appliance call for heat. LEDs #2, 4, 6, 8 (GREEN) shows
that the burner is approved to fire after the Venter Fan Prover safety circuit through the UC1 is completed. The MAC4E also has an LED #9
(RED) which means power is supplied to the MAC4E through the UC1.
MILLIVOLT INSTALLATIONS
Each millivolt appliance interlocked with the MAC4E must have its own WHKE kit installed. The WHKE Gas Pressure Switch actuates the Venter
through the A - B Dry contacts. The Linear Limit switch disables the heater in the event of a venting malfunction.
IMPORTANT
: Each millivolt
appliance interlocked with the MAC4E must have its own Linear Limit spill switch.
MAC4E MOUNTING
Do not mount the MAC4E junction box on a heat source that exceeds 104oF (40oC). Examples of improper mounting surfaces include vent pipe,
top of appliance casing or any place where radiant or convective heat would cause the junction box temperature to exceed 104oF.
The MAC4E is intended for indoor installation only.
The MAC4E has a 2 foot whip that contains 1 ground, 2 power and 3 communication leads. Mount MAC4E adjacent to UC1 control.
Using the key hole slots on the back of the MAC4E junction box as a template, mark 4 holes on the mounting surface, drill pilot holes if neces-
sary, and secure junction box using provided screws.
MAC4E SAFETY INTERLOCK TEST
PERFORM THE FOLLOWING INTERLOCK TEST AFTER CONNECTING MAC4E(S) TO UC1 AND INTERLOCKING ALL BURNERS
1. Confirm power is supplied to MAC4E control(s) from the UC1. MAC4E Power LED #9 (RED) should be on.
2. Initiate an appliance call for heat. MAC4E LED #1, 3, 5, or 7 (AMBER) should be on indicating an appliance call for heat.
3. If the UC1, P1 & P2 Prover safety circuit is closed, indicating an approved condition, the appliance interlock relay will close making
terminal #3 closed to terminal #4. MAC4E LED #2, 4, 6, or 8 (GREEN) shows that the burner is approved to fire. Fire all appliances
to make sure each burner fires properly.
4. Remove power to the UC1 and any interlocked appliances. The Power LED #5 (RED) on UC1 or any LED’s on UC1 or MAC4E
should not be on. Test the safety circuit by removing either lead from Fan Prover switch connected to UC1 P1 and P2 Fan Prover
safety circuit. Do not let the opened LEAD touch a ground or damage may occur to the control when power is reestablished.
Reestablish power to the UC1 and interlocked appliances and initiate a call for heat. After 60 seconds a Prover Start Up fault
should arise with UC1 LED #4 flashing 3 times.
5. Remove appliance call for heat and power to the UC1 and any interlocked appliances. The Power LED #5 (RED) on UC1 or any
LED’s on UC1 or MAC4E should not be on. Reconnect Fan Prover switch lead removed in step 4.
6. Reestablish power to UC1 and interlocked appliances and initiate a call for heat from each appliance to confirm proper operation of
UC1, MAC4E and appliances.
7. Perform Draft Adjustment and Combustion air safety check as outlined in Venter/Inducer installation manual.
IMPORTANT: DO NOT OPERATE AN APPLIANCE THAT OPERATES WITH THE PROVER SAFETY CIRCUIT DISCONNECTED!
RESETTING FAULT CODE CREATED BY STEP 4 OF SAFETY INTERLOCK TEST
IMPORTANT:
Prior to accessing the fault code memory, note the settings of the UC1 dip switches so that they can be returned to their original
Pre / Post-Purge positions. When power is supplied to the UC1 use caution when moving dip switches.
The last fault code can be retrieved at any time by setting all dip switches 1-8 to the up, or “on” position. The last fault code, or lack there of, will
be indicated by counting the number of times LED 4 flashes. By moving any of the dip switches back to their original position, the fault code will
be cleared.
NOTE:
The UC1 board must have its 115 VAC power supply present when any of the (1-8) dip switches are moved back to their
original position for the fault code to clear.
TJERNLUND PRODUCTS, INC.
1601 Ninth Street • White Bear Lake, MN 55110-6794
PHONE (800) 255-4208 • (651) 426-2993 • FAX (651) 426-9547
Visit our web site • www.tjernlund.com
Copyright © 2003, Tjernlund Products, Inc. All rights reserved. P/N 8504112 REV A 0803
Multiple heaters firing at the same time will result in varying volumes of flue gas and varying vent system draft pressures. Make sure all
heaters interlocked with the MAC4E operate within the normal draft range specified by the heater manufacturer. All heaters utilizing a fixed
speed Venter/Inducer must be equipped with a draft hood, draft diverter, or barometric draft control. Tjernlund ABD-Series Balancing Baffles
may be utilized for balancing draft on each heater.
