Replacement for old Honeywell S86H intermittent pilot control

garbid

Can any of the "old hands" recommend a suitable replacement for my Honeywell S86H intermittent pilot with 100% shutoff and auto ignition (25v, PV & MV = 2A max., 90 sec. ignition trial)? Honeywell doesn't show a replacement in its cross reference guides and the sources I've checked list it as obsolete (with good reason: it's on a very old Burnham boiler that has worked flawlessly for decades). There's nothing wrong with it but I fear that its age, like mine, might cause it to act up in the depths of winter one of these days. (I am replacing the Aquastat as well for the same reason.) Thanks for you help.

Steamhead

Use the Honeywell S8610U. It can be programmed to mimic your present control.

garbid

Thanks for the suggestion, Steamhead. 

garbid

Steamhead: Does the Honeywell S8610U ‘s lower PV load rating of maximum 1A vs the old unit’s 2A make any difference?

Steamhead

Shouldn't. What gas valve is on that unit? Is there a separate pilot valve?

garbid

The gas valve is Honeywell VR 844 P 5018 (also an old one but seems to operate fine).

109A_5

Hellow @garbid,
As @Steamhead said above.

garbid said:

Steamhead: Does the Honeywell S8610U ‘s lower PV load rating of maximum 1A vs the old unit’s 2A make any difference?

The gas valve is Honeywell VR 844 P 5018 (also an old one but seems to operate fine).

I can't find a specification on that Gas valve. Someone could measure the PV current to be sure.

Honeywell document.
https://s3.amazonaws.com/s3.supplyhouse.com/manuals/1299090484970/49449_PROD_FILE.pdf

S8610U replaces

S86H1006
S86H1022
S86H1048
S86H1089
S86H1097
S86H1105
S86H1121
S86H1147

garbid

Thanks for the information and link,  1095_A. I’ll measure the PV current as you suggested. I assume I do that from the existing pilot module to the gas control. 

109A_5

Hello @garbid,

Yes, just measure the current on the PV wire. Depending on your metering equipment, that will determine how you measure the current through that wire.

garbid

Hello again and thanks for all of the tips. The Honeywell (Resideo) S8610U is indeed the correct replacement for my old Honeywell S86H1006 module and now I’m ready to install the new one, but I’m a bit confused as to where the old 25v(1) and 25v (2) wires connect on the new module as the installation instructions aren’t particularly clear. (There is no vent damper.). Thanks for clarification. 

109A_5

Hello @garbid,

I suppose the only oddity here, is it to make sure the old 25v(1) or 25v (2) wires from the boiler (one or the other) were not grounded elsewhere. If so the grounded one should be connected to the 24V (GND) terminal.

OldManwithStick

Always read through your installation documents so you are familiar with the control wiring.

garbid

Thanks for your responses and helpful tips.