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SHEET METAL DUCT (Diagram B)

Choose a joint on the existing duct where the EF-Series fan will be mounted. 

IMPORTANT:

For proper operation of the PRC control do not install the EF-AUTO

within 10 duct diameters from outlet end supply register. For example if the duct is 6”,
6 x 10 = 60” from outlet supply register. Separate the existing duct sections at the joint.
Cut a piece of duct on the female side of the existing duct 1 inch shorter than the
shroud length of the EF-Series model being installed. 

NOTE:

DO NOT CUT OFF A

PIECE OF EXISTING DUCT WHICH HAS THE CRIMPED END. Insert fan in duct with
fan blade facing the direction of air flow, (See Diagram B). Seal joints with duct tape. If
extra support is necessary, use screws provided. Support with plumber’s strap or other
suitable method if necessary.

TROUBLESHOOTING

Motor (M2)

Motor (M1)

FOLLOW THE STEPS BELOW FOR A NEW INSTALLATION:

It may be necessary to measure voltage during troubleshooting. 

Extreme caution must be exercised to prevent injury.

If EF-AUTO fan does not run when the forced air handler fan/blower is running, verify 115 VAC power is supplied to the outlet the 
EF-AUTO is plugged into. If 115 VAC power is supplied to outlet and EF-AUTO does not run follow the steps below.

Block register at end of EF-AUTO duct run and turn on air handler fan/blower. If EF-AUTO turns on with register blocked, verify fur-
nace filter is clean. Replace filter if dirty and see if EF-AUTO turns on when air handler fan/blower is running. If filter is clean, move
EF-AUTO closer to the Air handler fan/blower to see if higher pressure turns EF-AUTO on. Proceed to next step if EF-AUTO does not
turn on.

CAUTION:

You will need to check for voltage across PRC control to proceed. Pull motor leads off of M1 & M2 on PRC sensing con-

trol. With forced air handler fan/blower running, check for 115 VAC across M1 & M2 on PRC sensing control, (See Diagram C). If volt-
age is not present, contact Tjernlund Products, Inc. @ 800-255-4208 for further assistance.

FOLLOW THE STEPS BELOW FOR AN EXISTING INSTALLATION:

It may be necessary to measure voltage during troubleshooting. 

Extreme caution must be exercised to prevent injury.

If EF-AUTO fan does not run when the forced air handler fan/blower is running, verify 115 VAC power is supplied to the outlet the 
EF-AUTO is plugged into. If 115 VAC power is supplied to outlet and EF-AUTO does not run follow the steps below.

IMPORTANT:

Unplug EF-AUTO fan from outlet before proceeding. Use a small screw driver to carefully pry sensing tube off of PRC

sensing port while at the same time pulling on sensing tube, (See Diagram D). Use compressed air or blow in sensing tube going to
sampling port in EF-AUTO housing, (See Diagram E). Replace tubing, plug in EF-AUTO, wait 30 seconds and turn air handler
fan/blower on to see if EF-AUTO turns on. Proceed to next step if EF-AUTO does not turn on.

Block register at end of EF-AUTO duct run and turn on air handler fan/blower. If EF-AUTO turns on with register blocked, verify fur-
nace filter is clean.  Replace filter if dirty and see if EF-AUTO turns on when air handler fan/blower is running. If filter is clean, move
EF-AUTO closer to the Air handler fan/blower to see if higher pressure turns EF-AUTO on. Proceed to next step if EF-AUTO does not
turn on.

CAUTION:

You will need to check for voltage across PRC control to proceed. Pull motor leads off of M1 & M2 on PRC sensing con-

trol. With forced air handler fan/blower running, check for 115 VAC across M1 & M2 on PRC sensing control, (See Diagram C). If volt-
age is present apply 115 VAC to motor leads to see if motor is defective. If voltage is not present, replace PRC control board or con-
tact Tjernlund Products, Inc. @ 800-255-4208 for further assistance.

AIR FLOW

8050018     10/20/08

DIAGRAM B

DIAGRAM E

DIAGRAM D

DIAGRAM C

USE COMPRESSED
AIR OR BLOW IN SENS-
ING TUBE GOING TO
SAMPLING PORT IN 
EF-AUTO HOUSING.

MEASURE FOR 115
VAC ACROSS M1 &
M2 WHILE AIR HAN-
DLER FAN/BLOWER
IS RUNNING.

USE A SMALL SCREW
DRIVER TO CAREFUL-
LY PRY SENSING TUBE
OFF OF PRC SENSING
PORT WHILE AT THE
SAME TIME PULLING 
ON SENSING TUBE.

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