Simer Pumps 2520ULST owner manual Installation / Maintenance, Cleaning the Check Valve

Installation / Maintenance 5

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		2. Connect both
	from NC terminal to		white leads to
	NO terminal		alarm with			wire
	as shown.		nuts as shown
				Alarm
	White	White	White	White
	NO	NC		NO		NC
	3	2		3		2
Common	C	1	Common	C	1
	Safety Switch		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.

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 assembly 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 reservoir 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 over- tightening 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.

For parts or assistance, call Simer Customer Service at 1-800-468-7867 /1-800-546-7867