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HONEYWELL RELAY -hey tim sos !!

bob youngbob young Member Posts: 2,174
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 gillgerry gill Member Posts: 2,587
    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 NMark N Member Posts: 1,034

    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 youngbob young Member Posts: 2,174
    '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 gillgerry gill Member Posts: 2,587
    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.

  • AbracadabraAbracadabra Member Posts: 1,910
    bad contacts

    a mechanical relay?  I'd guess contacts go bad after a while.
  • Mike KusiakMike Kusiak Member Posts: 604
    edited January 2012
    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.
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