McDonnell & Miller Uni-Match WFE-24, Instruction Manual

7

STEP 3 - Testing

a.

Open the inlet valve (X) and the outlet
valve (Y). Check for any leakage.
If there are any leaky connections, close
the inlet and outlet valves and correct
the problem.

b.

Turn the boiler’s electric power on and fill
it to the manufacturer's recommended
normal water level by depressing the red
manual feed button (Z) on the water
feeder.

X

Y

FEE

D

INDIC

ATOR

MANUA

L

FEED

Z

B

c.

Check the water feeder (B) operation by performing the following steps:

1.

Slowly drain water from the boiler.

2.

The burner should turn off when the water level drops below the cut-off level of the LWCO, which
will activate the water feeder's delay feed cycle.

3.

Feeder should turn on to feed water to boiler after delay period has expired.

NOTE:

Delay period is determined by position of selector.

Unit is shipped

with switch in Position 2.

Refer to chart on page 8 for alternate settings.

4.

Feeder will be deactivated when water level is restored to level as determined by LWCO.

NOTE:

McDonnell & Miller Series 

PSE

 LWCO's have a 

30 

second DOM (Delay on Make) to

restore

water level in boiler to an appropriate level without overfeeding.

Consult other

manufacturer's LWCO

installation literature

for DOM times.

5.

Repeat steps to ensure feeder is operating satisfactorily. 

If burner does not turn off when water level falls below level of LWCO, turn
off power to boiler and check operation of LWCO.

!

WARNING

Multi-Color LED

Upon receiving a signal from LWCO (power to terminal ‘W’) the multi-color LED will indicate the status
of the feeder.

Flashing Green Dwell Period -Solenoid Closed

————

Solid Green

Feed Period -Solenoid Open

————

Flashing Red

Invalid Feed Cycle Switch Setting

Only one of the switches should be in the ‘ON’ position.

Solid Red

Dwell/Feed Cycle Exceeded

Check operation of LWCO.

LED

Condition

Solution