Hello guys.
newbie here.
I would like my furnace fan to come on when I activate my hrv.
Do I need a furnace interlock relay?
I have a venmar 43110, furnace, AC, Ecobee 3 lite.
I have included pictures.
Cheers.
The Ecobee 3 Lite won't control an HRV so I assume you're still using the HRV control.
The relay part number is listed on your 3rd picture. You need to order Part #12658 and connect low voltage wiring to the furnace.
The Ecobee 3 or 4 would control the HRV and synchronize the furnace fan without that relay.
I looked high and low and can't seem to find that said relay.
Any ideas?
It looks like it's been discontinued. You might find 3rd party sellers like this one,
https://www.pinterest.ca/pin/102456960247474462/?lp=true
You could buy any SPDT relay with 120V coil and connect the coil to the wires leaving the #5 and #7 pins on the molex connector. Then follow the 3 wire interlock diagram in your picture to connect the relay to the furnace and thermostat.
Thanks.
any other sites that sell it?
Could you provide a diagram or picture of the wiring you mentioned? I'm a green newbie.
You could buy this White Rodgers #90-294Q relay,
https://www.amazon.ca/Emerson-90-294Q-SPDT-Enclosed-Relay/dp/B000PY28KG
And use this 18/3 24V wire,
https://www.homedepot.ca/en/home/p.faslvt-copper-thermostat-electrical-cable---183-brown-15m.1000663294.html
Install the relay inside the HRV and run wiring from the HRV into the furnace and follow the attached diagram. You'll need to crimp on 1/4" female spade connectors to connect your wiring to the relay,
https://www.homedepot.ca/en/home/p.terminal-kit-175-pc.1001012519.html
https://www.homedepot.ca/en/home/p.multi-purpose-6-in-1-tool.1000421422.html
I'm not sure if pins #5 and #7 on the HRV 9-Pin Molex plug already have capped wires attached. If not you would have to crimp on a certain type of Molex crimp terminal onto the ends of the wires coming from relay terminals #1 and #3. The next link is to a wiring assembly you might be able to use. You can cut the molex connector off and only use 2 of the 3 wires. I'm not sure if this is the right size for your HRV 9-Pin Molex plug though.
https://www.pololu.com/product/1798
Thanks again. ;D
Is there any does and don'ts I should be aware of ?
Cheers
Just unplug the HRV and turn off the furnace power switch. It's all low voltage so not much can go wrong.
Thanks again.
I have a few questions about the operation. Bear with me, I like to know how machines work in my home.
When I press the hrv button in the bathroom, does it activate the furnace fan right away or is there a delay? Does it run on low or high?
Does the hrv turn on when the furnace heat/ac is on ?
Is there a way of balancing the unit without calling an hvac pro and/or a gauge ?
QuoteI have a few questions about the operation. Bear with me, I like to know how machines work in my home.
When I press the hrv button in the bathroom, does it activate the furnace fan right away or is there a delay? Does it run on low or high?
Does the hrv turn on when the furnace heat/ac is on ?
Is there a way of balancing the unit without calling an hvac pro and/or a gauge ?
I missed this post. I think unless you have a control with both MIN and MAX the high speed fan will always run. The HRV should run anytime the main control or bathroom timers are turned on, regardless if the furnace or AC are running or not.
Without a digital manometer or magnehelic gauge you won't be able to balance the HRV.
good day,
In a post above, you wrote "The Ecobee 3 Lite won't control an HRV so I assume you're still using the HRV control.
The relay part number is listed on your 3rd picture. You need to order Part #12658 and connect low voltage wiring to the furnace.
The Ecobee 3 or 4 would control the HRV and synchronize the furnace fan without that relay."
I have an Ecobee3. I just spoke to Vanee/Venmar and the tech said I HAVE TO use a relay to synchronize the of control the furnace with the HRV. Can you respond? is there a way around a relay?
You have an older HRV and would need to install a relay in order to interlock the HRV with the furnace fan, according to the HRV manual, but you can accomplish the same thing by using an Ecobee 3.
Connect the 2 wires from HRV terminals B and G to the Ecobee ACC terminals. It doesn't matter which wire goes to which ACC terminal.
Add the ventilator in the Ecobee settings. Now anytime the Ecobee turns on the HRV it should also energize the furnace fan.
There would be no need to buy the relay for the HRV because it's not controlling the furnace fan, the Ecobee is.