Help! Secondary pump isn't kicking on!

[Flexia]

Here are some specs. I have a navien ch210 combi boiler. I am trying to use the remote that comes with it as a thermostat. But it isn't triggering my taco relay so the secondary pump never kicks on. The boiler does fire up and circulate just fine and I do have the dipswitch for the external thermostat off

I have the T T from the boiler hooked up to the taco sr501 switching relay at the 6 n/o and at 5. Is this not correct?

 

[Rookie2]

I think it should go to R & W

 

[Flexia]

I think it should go to R & W

I have tried that and the navien still doesn't send a trigger to the pump relay

 

[Rookie2]

I have tried that and the navien still doesn't send a trigger to the pump relay

I can't find the wiring diagram for the boiler on line, if you post it someone can figure it out.

 

[Flexia]

Here is the diagram thats in the manual.

 

[LS6 Tommy]

All I see there is "N", CN18, Yel/Wht feeding (1) pump directly. No relay...

Tommy

 

[Flexia]

All I see there is "N", CN18, Yel/Wht feeding (1) pump directly. No relay...

Tommy

There is a relay its just sealed on the board. Here is the ladder. I was thinking about making a relay to hook the the pump wire to trigger the taco relay

 

[Rookie2]

I would call the tech line !
All I see that it could possibly be is (outputs) T/CN26 or R/CN25 or that S block .

If you wired the taco sr501 correctly then by jumping R & W the circulator should run.

 

[truckman5000]

look at the sr501 wire diagram, you need to put a hot? jumper to the #5? terminal. As i dont have one infront of me, but the pump contacts dont get line voltage, without the jumper. Its a 24v/120v contact, bringing 120 to it would power the pump

 

[Flexia]

look at the sr501 wire diagram, you need to put a hot? jumper to the #5? terminal. As i dont have one infront of me, but the pump contacts dont get line voltage, without the jumper. Its a 24v/120v contact, bringing 120 to it would power the pump

That's not the problem. I can bridge the R&W on the taco to start the pump. The problem is the boiler isn't telling the taco really when to turn on

 

[Flexia]

I would call the tech line !
All I see that it could possibly be is (outputs) T/CN26 or R/CN25 or that S block .

If you wired the taco sr501 correctly then by jumping R & W the circulator should run.

When I got home today I put my multimeter on the cn26/ external power. It does throw 120v out when the primary pump in the navien in on. I'll prob make a relay that will flip from that 120 and then it will bridge the R&W when flipped.

 

[brewchief]

How is the remote going to work as a thermostat? I thought you could only use it to adjust the boiler temp? Does it have any type of room temp sensor in it?

I would use a normal thermostat to control the taco relay and the aux contacts in the relay to turn the boiler on and off.

 

[Flexia]

How is the remote going to work as a thermostat? I thought you could only use it to adjust the boiler temp? Does it have any type of room temp sensor in it?

I would use a normal thermostat to control the taco relay and the aux contacts in the relay to turn the boiler on and off.

Yes the navien remote can act like a thermostat. Has temp sensor and is programmable too

 

[LS6 Tommy]

I would call the tech line !
All I see that it could possibly be is (outputs) T/CN26 or R/CN25 or that S block .

If you wired the taco sr501 correctly then by jumping R & W the circulator should run.

That's what I was thinking, too.

I got so wrapped up in trying to find a relay on the diagram I forgot to post that.

Tommy

 

[Rookie2]

That's what I was thinking, too.

I got so wrapped up in trying to find a relay on the diagram I forgot to post that.

Tommy

I start to get paranoid if I can't stick a meter lead in there to check voltages ! LoL

 

[Flexia]

Just to update you guys. I used the external power term on the navien to flip a small 120v relay that then will bridge the TT on the taco relay.

It works for me but is an extra step. You could get a bigger 120v relay that will get triggered from the boiler to power the pump. But I already had the taco contoler