Tjernlund MAC1E User Manual

MAC1E OPERATION

The MAC1E is used in conjunction with the UC1 Universal Control to interlock one additional 24 VAC, 115 VAC or millivolt (Dry Contact) con­trolled appliance. 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 appliance to operate. Any pre/post-purge settings on the UC1 will be defaulted to the MAC1E. Two LEDs are provided on
the MAC1E. LED #1 (Amber) shows an appliance call for heat. LED #2 (Green) shows that the burner is approved to fire after the Venter Fan
Prover safety circuit through the UC1 is completed.

MILLIVOLT INSTALLATIONS

Each millivolt appliance interlocked with the MAC1E 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 MAC1E must have its own Linear Limit spill switch.

MAC1E MOUNTING

Do not mount the MAC1E 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 MAC1E is intended for indoor installation only.

The MAC1E has a 2 foot whip that contains 1 ground, 2 power and 3 communication leads. Mount MAC1E adjacent to UC1 control.

Using the key hole slots on the back of the MAC1E junction box as a template, mark 4 holes on the mounting surface, drill pilot holes if neces­sary, and secure junction box using provided screws.

MAC1E SAFETY INTERLOCK TEST

PERFORM THE FOLLOWING INTERLOCK TEST AFTER CONNECTING MAC1E TO UC1 AND INTERLOCKING ALL BURNERS

1. Confirm power is supplied to MAC1E control from the UC1.

2. Initiate an appliance call for heat. MAC1E LED #1 (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. MAC1E LED #2 (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 MAC1E
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 MAC1E 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, MAC1E 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.

NS WIT

TJERNLUND PRODUCTS, INC.

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

Copyright © 2004, Tjernlund Products, Inc. All rights reserved. P/N 8504110 REV A 1204

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 MAC1E 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.

MAC1E WIRING CONNECTIONS WITH UC1 UNIVERSAL CONTROL

Remove power to UC1 and heating equipment when making connections from the MAC1E to the UC1 or installing, servicing or changing dip
switch settings in the UC1. Failure to do so may result in personal injury and/or equipment damage. LED #5 (RED) or any LED on the UC1
should not be on if 115 VAC supply power is removed from the control.

See UC1 Universal Control wiring section of Venter or UC1 instructions for 24 VAC, 115 VAC or Millivolt (Dry Contact) appliance inter­lock diagrams. The MAC1E and UC1 Universal Control appliance interlock steps and diagrams are identical.

MAC1E SAFETY INTER-

LOCK TEST

IMPORTANT:

RED JUMPER POSITION VOLTAGE MUST BE THE
SAME AS APPLIANCE INTERLOCKED WITH UC1.

CALL

RELAY

INTERLOCK

PRODUCTS,

INC.

R

TJERNLUND

MTRMN

24 VAC

D/N 8056003

DO NOT SUPPLY POWER!

5 VDC BOARD-GENERATED POWE R

115V

J2

24V

DRY

LEGEND: 115 VAC

5

POST-PURGE SETTINGS

OPEN PROVER OPTION

(9)

(3 - 8)

9

786

FGND

ON

PRE-PURGE SETTINGS

(1 - 2)

24
3

1

CP1P2

J1

XL

XN

115 OR 24 VAC FROM CALL JUMPER
OR USER-PROVIDED VOLTAGE
FROM TERMINAL 3 TO 4 WITH CALL
JUMPER REMOVED

K2

K1

JUMPER

NEUT.

INC.

PRODUCTS,

TJERNLUND

APPROVED

R

USER-PROVIDED

COM.

HOT

24 VAC

OR

CALL SWITCH

OR

LINE

115 VAC

"DRY"

XN

XL

K1

JUMPER

J2

J1

115V

DRY

CALL

24V

FGNDC

RED JUMPER POSITION VOLTAGE MUST BE THE
SAME AS APPLIANCE INTERLOCKED WITH MAC1E.

DO NOT SUPPLY VOLTAGE

TO "A" OR "B".

IMPORTANT:

W
H

I
T

E

A

E

E
D

R

Y

T

G
R

O
L

I

V

MAC1E CONTROL UNIVERSAL CONTROL

E

A
C
K

I

T

WHB

L

INTERLOCK

RELAY

A

K

C

B
L

APPLIANCE CALL

APPLIANCE "GO"

PROVER

V

I

E

O
L

A
Y

R

G

D

E

R

T

CONDUIT

24" FLEX

N

E
E

R

G

R

N

E

E

G

GREEN

AMBER

LED1LE D2 LED1LED5 LED4 LED2LED3

RED

RED

GREEN

GREEN

AMBER

Connect Black from MAC1E whip to XL on UC1.
Connect White from MAC1E whip to XN on UC1.
Connect Violet from MAC1E whip to C on UC1
Connect Gray from MAC1E whip to GND on UC1.
Connect Red from MAC1E whip to F on UC1.
Connect Green from MAC1E whip to ground in UC1.

IMPORTANT: Venter Fan Prover must be wired to
P1 and P2 safety circuit in UC1.

RED appliance interlock voltage jumper in MAC1E
and UC1 must be positioned based on the control
voltage of the appliance interlocked with each control.