Engineered air DG series Manuel d'utilisateur

AINSTALLATION, OPERATIONAND MAINTENANCE MANUALFOR109 INTERFACEMODULATING “ DG” BURNER CONTROLINDOOR AND OUTDOOR MODELSLISTEDRUNIT MODEL NO. __________

Page 6LOW FIRE BUT NO MODULATIONThe modulating valve should be able to be modulated to any position after the 109 contacts areclosed and the main flam

ENG A 109 INTERFACETO V905524V POWER SUPPLY140 OHMPOTENTIOMETERINPUTMAXITROL SERIES 14*TT 8 9 B R W12 3 4 5 6 712BRW* NOTE: If using a Maxitrolsystem

Page iINSTALLATION, OPERATIONAND MAINTENANCE MANUALINDEXPAGEPURPOSE ...

Page 1109 INTERFACEPURPOSEThe 109-2 Interface gives improved temperature control to a Engineered Air DG model unit. TheDG style unit uses a power burn

Page 2Recently there has been the introduction of a servo-motor that is being used to modulate thegas flow. The servo-motor operates a modified Neo va

Page 3CONTROL CONNECTIONS24 VOLT SUPPLY – to 109 terminals T and TINTERNAL RELAY TERMINALS – used to cycle the signal to the flame relay (or the gas v

Page 4T991A HONEYWELL OR OTHER SERIES 90 CONTROLThe series 90 controls are a 135-ohm control system that usually uses a liquid filledcapillary to move

Page 5TROUBLESHOOTINGAll the following steps are assuming the unit is not having flame failure problems. If the problemyou are trying to rectify is on