VCMA-15ULS 115-Volt Condensate Removal Pump with Safety Switch

The back flow or check valve is built into the discharge nipple. The OD of the discharge is 3/8" so the ID of the tube would also be 3/8"

It comes as one unit!

I am going to assume this is not a new installation but an existing unit that is no longer working. Assuming that is the case, it has been my experience that the the most common culprit when it comes to condensate pumps stop working is not that they have worn out and are broken. The most common cause is algae and other life has started to grow in the stagnant water inside the tank. Nine out of 10 times I can fix the unit by removing it and cleaning out the life that has grown inside with a combination of hot water and bleach. The material binds switches and clogs tubes and once removed the units typically go back to working order. That being said, if the pump is in a location where the overflowing water may cause damage, I still may recommend replacing it the unit is old. Then keeping the old as a spare. Why? because often the cost of a new pump is less than the cost of painting a new wall that has become stained.

Yes. This pump should have sufficient capacity to service both.

What I did was removed the 15 amp on/off switch on the furnace and replaced that with an on/off switch with a gfci outlet. From that point, I followed the instructions.

Yes, I believe this should work well. I had my for years with no issues

That is not normal. The pump should only run for a minute or so at a time. Some possibilities include a stuck float switch, an obstructed drain tube (is water actually flowing out when it runs?), or the possibility that you have water running into the pump chamber as fast as it is pumped out (unlikely, but it is a possibility if water is flowing out from the drain tube).

An automatic pump will self activate when the sump is full, pump the water from the sump, and shut off when the sump is empty. The VCMA is an automatic pump. The safety switch is wired to the control circuit of the equipment, usually an air conditioner or condensing furnace. This switch shuts off the equipment to stop the production of water in the event the condensate pump fails.

This is not a high volume pump. No gallon/hour specification is listed. It has a 1/2 gallon reservoir and it will empty this amount of water in about 15 seconds. This suggests a capacity of about 2 gallons/minute at less than 10 feet head. I have used this pump in many HVAC applications and I have never had a capacity problem when used as a condensate pump.

The S is for safety switch.