Installation / Maintenance - MYERS MCU Serie Notice D'utilisation

Installation / Maintenance

H. Risk of Flooding. With installation
No. 2 ("Safety Switch Sounds Alarm"), the alarm is
activated when the water level in the reservoir is
within about 1/2" of the top of the reservoir.
However, the furnace/AC unit will continue to pro-
duce condensate because the alarm will not shut it
down. Monitor the installation so that in case of
high water level in the condensate reservoir you
can take action before the reservoir overflows and
flooding occurs.
1. Move white lead
from NC terminal to
NO terminal
as shown.
Safety Switch
Figure 2: Low Voltage Auxiliary Safety Switch connec-
tion for alarm circuit installation (does not shut down
furnace/AC unit).
Testing Auxiliary Safety Switch:
NOTICE: Some appliances may not start immediately due
to a built-in delay circuit that prevents rapid cycling of the
compressor.
1. Start appliance.
2. Unplug the condensate pump so that it cannot pump
out.
3. Pour water into the pump reservoir until it is almost
full.
4. As the water rises in the reservoir, the safety switch
should shut down the appliance or set off the alarm
(depending on the installation procedure used).
5. Plug in the condensate pump and allow it to empty the
reservoir. As the water level goes down in the reservoir,
the safety switch should reset, allowing the appliance
to start or shutting off the alarm.
2. Connect both
white leads to
alarm with wire
nuts as shown
Alarm
Safety Switch
MAINTENANCE
1. Disconnect the power to the furnace/AC unit and
unplug the pump.
2. Disconnect the tubing to the pump. Drain the tubing
into a container.
3. Remove the two mounting screws and remove the
pump from the furnace or wall. Dump the reservoir
into a floor drain or container.
4. After you have dumped the pump, remove the four
screws securing the reservoir to the pump deck. Lift the
deck/pump assembly off of the reservoir.
5. Turn the deck/pump assembly upside down and
remove the five screws holding the impeller cover to
the motor.
6. Remove the impeller cover. The rotor/ impeller assem-
bly may come out with it. If not, pull it out of the rotor
chamber in the motor. (You may have to pull it hard to
get it out against the magnetism in the motor windings.)
7. Clean the impeller, rotor, rotor cavity, and O-Ring. Use
a rag to clean the O-Ring groove in the impeller cover
and the sealing surface on the bottom of the motor
block.
8. Clean out the reservoir.
9. Reassemble the impeller and the impeller cover; tighten
the screws carefully. Do not overtighten!
10. Turn everything right side up and reassemble the reser-
voir to the deck. Be sure the impeller cover fits into the
molded ring in the bottom of the reservoir. Fasten the
reservoir with the four screws at the corners.
11. Reinstall the pump on the furnace.
12. Plug in the pump, fill the reservoir, and run the pump
through one complete pump-down cycle to be sure it
works correctly.
13. The pump is ready for operation.
CLEANING THE CHECK VALVE
1. Unplug the condensate pump.
2. Remove the discharge line from the check valve.
3. Use a 9/16" wrench to remove the check valve from
the pump deck.
4. Inspect the valve for obstructions or damage. Clean or
replace it as needed.
5. Thread the valve back into the pump discharge by
hand, plus 1/2 turn with the wrench.
NOTICE: Don't overtighten the valve, as overtightening
can distort the O-Ring that seals the valve, causing
leaks.
6. Plug in the pump, fill the reservoir, and run the pump
through one complete pump-down cycle to be sure it
works correctly.
7. The pump is ready for operation.
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