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post #1 of 35 Old 03-14-2018, 07:56 PM Thread Starter
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perplexed...generator output issue

not sure what to think, new 110v genset, less than 10 hrs so far. seeing 118 v at 60 hz. runs my wood oil combo boiler no issue, other than the transformer for the thermostats.....its stepped down from 120v to 24v and feeds the zone valves. i get no 24v out when the heating system is on generator but the circ pump(s) and burner work just fine. could the hz be to dirty for a simple step down transformer ?

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post #2 of 35 Old 03-14-2018, 08:23 PM
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The circulators would only run when heat is called for from the thermostat so the thermostats would have to be working, right?
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post #3 of 35 Old 03-14-2018, 09:32 PM Thread Starter
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The circulators would only run when heat is called for from the thermostat so the thermostats would have to be working, right?
stats seem to be working with the gen, and "click" when the temp setting is raised, but no go on the zone valves with the gen. i did test from a wall outlet, and the furnace works as normal on line power when switched to gen

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post #4 of 35 Old 03-14-2018, 10:39 PM
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If I remember right you have to have the right power wave(sine wave I think) to run the zone valves.
Are your zone valves capable of being left open to bypass the issue entirely?
Most if not all of them can be set to remain open by moving a switch or tab on the zone valve.

The smaller generators lack this signal conditioning/wide power range to have enough balanced low voltage
power feed to the low voltage switches.

I would just leave the zone valves open if needed if the power craps out on you in any case and you need the generator.
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post #5 of 35 Old 03-15-2018, 12:46 AM
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Is the genset/transformer putting out 24v DC?

I believe most zone valves want AC. What are you using... Taco? Grundfoss?


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post #6 of 35 Old 03-15-2018, 01:02 AM
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Your burner and circulator pump turn on but the zone valve doesn’t open?

As far as I know zoned hydronic heating systems have a certain sequence of operation.

When a thermostat calls for heat, the zone valve must fully open and close a limit switch for the circulator pump and burner to turn on.

Yours might be different, I’m no HVAC expert.

A non uniform sine wave (dirty power) could be the problem. I’m surprised a zone valve would be so picky. Are you getting ~24v 60hz out of the transformer?

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post #7 of 35 Old 03-15-2018, 02:27 AM
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FWIW, step up/down transformers are not particularly frequency sensitive, especially at low freqs such as power line.. Even if the waveform is a tad ugly you should still see output, but the transformer may run hot. Without seeing your unit, this doesn't make much sense . . . *unless* there is a solid state switching power supply in the mix somewhere - those can be quite picky about input power quality.

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post #8 of 35 Old 03-15-2018, 05:24 PM Thread Starter
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Quote:
Originally Posted by leonz View Post
If I remember right you have to have the right power wave(sine wave I think) to run the zone valves.
Are your zone valves capable of being left open to bypass the issue entirely?
Most if not all of them can be set to remain open by moving a switch or tab on the zone valve.

The smaller generators lack this signal conditioning/wide power range to have enough balanced low voltage
power feed to the low voltage switches.

I would just leave the zone valves open if needed if the power craps out on you in any case and you need the generator.
i can open the zone valves manually, but not the best situation if i want to run the gen all night. my problem seems to be with that step down transformer putting out zero v .

24 " 1967? Ariens Sno thro
28 " Ariens Sno Tek
Toro CCR ss
1966 Gravely LI Walk behind with dog eater

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post #9 of 35 Old 03-15-2018, 05:26 PM Thread Starter
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Originally Posted by Yanmar Ronin View Post
Is the genset/transformer putting out 24v DC?

I believe most zone valves want AC. What are you using... Taco? Grundfoss?
the transformer puts out 24vac on line current, but zero vac on gen power. the valves are schnieder.

24 " 1967? Ariens Sno thro
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Toro CCR ss
1966 Gravely LI Walk behind with dog eater

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post #10 of 35 Old 03-15-2018, 05:29 PM
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Hmmm... :headscratch:

This is just a simple coil type wound transformer with no electronics?


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