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    HONEYWELL RELAY -hey tim sos !! (7 Posts)

  • bob young bob young @ 11:56 AM
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    HONEYWELL RELAY -hey tim sos !!

    HONEYWELL RELAY R8222  Been experiencing more than a few nuisance no heat call with this relay being the culprit.  firstlly, why are they so unreliable. secondly could sopmeone define their exact purpose & if they are absolutely necessary for safe operation & can they be bypassed temporarily or permanently & safely.
  • gerry gill gerry gill @ 12:12 PM
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    Bob. Are these the relays

    On the steam boilers that isolate the thermostats?
    Serving Cleveland's eastern suburbs from Cleveland Heights down to Cuyahoga Falls.
  • Mark N Mark N @ 12:27 PM
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    To me it looks like when the thermostat calls for heat it energizes the coil of the relay. This causes the normally open contacts to close and energize the gas valve.
  • bob young bob young @ 12:30 PM
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    'stat relay R8222

    yes, i neglected to state that is a thermostat relay.  a very annoying 'stat relay, i may add !!  lol  . it actually happened to me in my house this morning. !!!  how revolting !  can't turn a buck on a no heat call when its your own !!!   happy new year !
  • gerry gill gerry gill @ 7:15 PM
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    i believe they are there

    due to some people using power stealing thermostats which did something weird with the dampers if i recall..i have on occassion bypassed them when a standard two wire t-stat was used and had no issues..
    Serving Cleveland's eastern suburbs from Cleveland Heights down to Cuyahoga Falls.
  • Abracadabra Abracadabra @ 10:59 AM
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    bad contacts

    a mechanical relay?  I'd guess contacts go bad after a while.
  • Mike Kusiak Mike Kusiak @ 11:19 AM
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    Contact ratings

    Depending on which model you are using, the contacts could be the problem. The R4222A models have contacts designed to switch high power 120 or 240 VAC loads. Using this relay to switch 24V control circuits will be a problem as the contacts will not self clean. Oxide builds up on the contacts and eventually the circuit won't switch.

    According to the spec sheet, the R4222K has pilot duty contacts rated to switch low voltage circuits, which would be a better choice.
    This post was edited by an admin on January 3, 2012 11:28 AM.
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