FAQ’s
BDR91 Relay Box Controls Layout
How do I change the batteries on the
thermostat when they run out?
The relay box will normally be found mounted
close to the boiler.
Theꢀ thermostatꢀ constantlyꢀ monitorsꢀ theꢀ batteryꢀ
powerꢀ level,ꢀ whichꢀ typicallyꢀ lastsꢀ forꢀ aboutꢀ 2ꢀ
yearsꢀbeforeꢀneedingꢀreplaced.ꢀWhenꢀtheꢀpowerꢀ
isꢀ runningꢀ lowꢀ aꢀ flashingꢀ
ꢀ symbolꢀ willꢀ beꢀ
displayedꢀonꢀtheꢀscreen.ꢀToꢀchangeꢀtheꢀbatteriesꢀ
followꢀtheꢀstepsꢀinꢀtheꢀaboveꢀsectionꢀ(‘STEP 1:
Installing the Batteries’ꢀonꢀpageꢀ3),ꢀreplacingꢀ
theꢀ usedꢀ batteriesꢀ withꢀ newꢀ onesꢀ inꢀ Stepꢀ c.ꢀ
Note:ꢀWhileꢀchangingꢀtheꢀbatteriesꢀyourꢀprogramꢀ
settingsꢀwillꢀbeꢀstoredꢀbutꢀyouꢀmayꢀneedꢀtoꢀadjustꢀ
theꢀtimeꢀsettingsꢀtoꢀbeꢀcorrect.
Push button
and relay
status LED’s
How do I set one temperature for the
whole day?
What does it mean when the BDR91
relay box green LED is ON?
Toꢀ operateꢀ asꢀ aꢀ simpleꢀ thermostatꢀ withꢀ oneꢀ
temperatureꢀ throughoutꢀ theꢀ day,ꢀ selectꢀ theꢀ
manualꢀ operatingꢀ modeꢀ byꢀ pressingꢀ theꢀ
MANꢀ button.ꢀ Adjustꢀ theꢀ temperatureꢀ byꢀ
The green LED indicates normal operation of
the radio frequency system. When the green
LED is ON the boiler is also ON. When the LED
is OFF the boiler is OFF.
pressingꢀtheꢀ
ꢀorꢀ ꢀbuttonsꢀ-ꢀthisꢀcanꢀbeꢀ
setꢀanywhereꢀfromꢀ5°Cꢀtoꢀ35°Cꢀinꢀ0.5°Cꢀsteps.ꢀ
Theꢀ thermostatꢀ willꢀ continueꢀ toꢀ maintainꢀ thisꢀ
temperatureꢀ untilꢀ anotherꢀ operatingꢀ modeꢀ isꢀ
selectedꢀorꢀtheꢀtemperatureꢀisꢀadjusted.
When do I need to use the push
button?
You should use the push button to control your
boiler only when the RF communication is lost
(
see the Troubleshooting Guide).
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product(s) described.
This product has been designed for applications as described within this document. For use
outside of the scope as described herein, refer to Honeywell for guidance. Honeywell cannot be
held responsible for misapplication of the product(s) described within this document.
Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell
Technologies Sàrl, ACS-ECC EMEA, Z.A. La Pièce 16, 1180 Rolle, Switzerland by its Authorised
Representative Honeywell Inc.
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