Greenheck Fan Part #470655 Electric Heater User Manual


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DGX Industrial Space Heating
• PowerpassesthroughN.O.contactonfanrelay
(RF), which is energized and closed
• Powerpassestoandenergizestheheatrelay(RH)
• PowerpassesthroughN.O.contactonheatrelay
(RH), which is energized and closed
• Powerpassestoandenergizesterminal5onthe
Flame Safeguard (FSG)
• PowerpassesthroughN.C.contactonhigh
temperature limit control (HLC1), which remains
closed if the temperature has remained below the
HLC1 set point
• PowerpassesthroughoptionalN.C.andN.O.high
and low gas pressure contacts (PS4 and PS3),
which are both closed if the gas pressure is within
the set range
• Powerpassestoterminal6ontheFlameSafeguard
(FSG)
• FlameSafeguard(FSG)beginsdirectgasburner
sequence (See Flame Safeguard Sequence)
3. Flame Safeguard (FSG) Sequence
• Veriesproperairowwithairowswitch(PS2)
• Veriesnoameispresentatburner
• Initiates10secondprepurge
• Sendspowertoopenpilotvalve(V1)andenergizes
the spark generator (SG) (clicking of the spark
generator may be heard)
• Energizessparkgeneratorforupto10secondsto
light pilot and confirm flame
• Powersthemaingasvalve(V2)open
• Shutsdownsparkgenerator(SG)
• Continuouslymonitorstheameandairow
• Performsself-diagnosticcheckeveryfourseconds
Operation - Electrical Sequence
• Without 7-Day Timer
1. Switch (S2) in Summer Mode
• PowerpassesthroughN.C.eld-suppliedre
contact (FSC)
• PowerpassesthroughterminalG
• PowerpassesthroughN.C.contactonsupply
starter overload (ST1 OL), which is closed if the
supply fan has not overloaded
• PowerpassesthroughN.Ccontactonoptional
freeze protection timer (RT4), which is closed if the
temperature has remained above the set point.
• Powerpassestoandenergizesoptionalinlet
damper (D1), which opens
• Powerpassestoandenergizesfanrelay(RF)
• PowerpassestoN.O.contactonfanrelay(RF),
which closes once the fan relay (RF) is activated
• Powerpassestoandenergizessupplyfanstarter
(ST1)
• N.O.contactonsupplyfanstarter(ST1)is
energized and closed
• Supplyfan(M1)starts
2. Switch (S2) in Winter Mode
• Ifspacetemperatureislessthanthedaytime
temperature setting, the N.O. contact on the
temperature sensor (TS) closes
• PowerpassesthroughN.C.eld-suppliedre
contact (FSC)
• PowerpassesthroughterminalW1andthen
energizes the space heat relay (RS)
• PowerpassesthroughN.O.contactonthespace
heat relay (RS), which is energized and closed
• PowerpassesthroughterminalG
• PowerpassesthroughN.C.contactonsupply
starter overload (ST1 OL), which is closed if the
supply fan has not overloaded
• PowerpassesthroughN.C.contactonoptional
freeze protection timer (RT4), which is closed if the
temperature has remained above the set point
• Powerpassestoandenergizesoptionalinlet
damper (D1), which opens
• Powerpassestoandenergizesfanrelay(RF)
• PowerpassestoN.O.contactonfanrelay(RF),
which closes once the fan relay (RF) is activated
• Powerpassestoandenergizesstarterrelay(ST1)
• N.O.contactonsupplyfanstarter(ST1)is
energized and closed
• Supplyfan(M1)starts
®
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