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Greenheck DGX, Installation, Operation And Maintenance Manual, Page: 30 / 48

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Greenheck DGX Installation, Operation And Maintenance Manual Download Page 30

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Operation  -  Electrical

1.  Exhaust Fan Switch (S1) Closed

•  Power passes to exhaust starter(s) ST2(3)
•  N.O. exhaust starter switches are energized

and closed

•  Power passes to exhaust fans
•  Exhaust fans start

2.  Supply Fan Switch (S2) Closed

•  N.O. contact(s) ST2(3) are closed
•  Power passes to optional freeze protection

relay (FZ1) and if temperature is acceptable
N.C. contact (FZ1) remains closed

•  Power passes to damper which opens
•  When damper is fully opened, damper relay

(D1) is energized and N.O. damper limit switch
(DL1) closes.

•  Power passes to and energizes supply starter

relay (ST1)

•  Supply starter contact (ST1) closes and power

reaches and energizes supply fan

•  Supply fan starts

4.  Evaporative Cooling Switch (S4)

Closed*

•  N.O. contact ST1(AUX) is energized and closed
•  Power passes to and energizes cool relay (R1)
•  N.O. contact R1 is energized and closed 
• Power passes to evaporative cooling pump (P1)

*If DX or chilled water coils are used rather than

an evaporative cooler, the cooling sequence of
operation will depend on the coil controls.
Cooling coil controls are supplied by others.

3.  Heat Switch (S3) Closed

•  Power passes to N.O. ST1 which is energized

and closed

•  Power passes to inlet air sensor contact (TS1)

which is energized and closed if proper inlet air
temperature is present

•  Power passes to and energizes heat relay (R2)
•  N.O. heat relay contact (R2) closes
•  Power passes to N.C. high limit control contact

(HLC1) which is closed if temperature has
remained below set point

•  Power passes to N.O. and N.C. gas pressure

contacts (PS1) which are both closed if gas
pressure is within the set range

•  Power passes to N.O. and N.C. airflow switch

(PS2) which are closed if there is proper airflow
across the burner

• Power passes to terminal L1 on the FSG which

begins it’s sequence (see direct gas sequence)

1.  Supply Fan Switch Closed

•  Power passes to the supply fan and heat switch

2.  Heat Switch Closed

•  Power passes to the heat relay then to the

Flame Safe Guard

3.  Flame Safe Guard (FSG) Sequence

•  Checks for proper airflow
•  Verifies no flame present at burner
•  Initiates 15 second prepurge
•  Sends power to open gas valve (V2) and

energizes the spark generator (clicking of the
spark generator may be heard).

•  Tries for up to 10 seconds to light and confirm

flame.

•  Shuts down spark generator
•  Continuously monitors the flame and airflow

Electrical Sequence

Direct Gas Burner Sequence

Operation

Summary of Contents for DGX

Page 1: ...r original condition as received from Greenheck The individual receiving the equipment is responsible for inspecting the unit for obvious or hidden damage recording any damage on the bill of lading be...

Page 2: ...t 46 Control Center Layout 47 Maintenance Routine 38 40 Fall 41 42 Log 43 45 M R STORAGE When a unit is not going to be in service for an extended period of time certain procedures should be followed...

Page 3: ...Greenheck hanging bracket kit or c channel and angle iron supplied by others should be used See figure 1 Using self tapping screws attach ductwork to unit In order to prevent the unit from swinging an...

Page 4: ...spreader bars hooked to the factory lifting lugs to lift and center the unit on the curb equipment support s See figure 5 Use self tapping sheet metal screws to fasten the unit to the curb equipment...

Page 5: ...ing wood screws Locate the extension so the tall vented side is over the exhaust opening See figure 8 Installation Roof Mounted Unit Arrangement DBC Installation Step 4 Apply Sealant Apply an appropri...

Page 6: ...tach Weatherhood The weatherhood can now be assembled and or attached to the unit Detailed assembly instructions can be found with the weatherhood If the optional evaporative cooling module was select...

Page 7: ...the evaporative cooler should overlap the flange on the unit See figure 16 Step 4 Secure Cooling Module to Unit Use self tapping screws to fasten the cooling module to the base unit along the top and...

Page 8: ...TANT The equipment must be properly grounded Any wiring running through the unit in the airstream must be protected by metal conduit metal clad cable or raceways Step 1 Determine the Size of the Main...

Page 9: ...Control See I 16 for building pressure set up and operation check NOTE Large evaporative coolers may require a separate power supply NOTE TSCP has number to number wiring NOTE Wiring to the Maxitrol 1...

Page 10: ...ater and manual shutoff valve must be disconnected from the supply gas line WARNING If pressure testing at or below 1 2 psig 3 5 kPa the heater must be isolated from the supply gas line by closing its...

Page 11: ...s pressure exceeds the maximum gas pressure shown on the direct gas nameplate an additional regulator by others is required to reduce the pressure The regulator must have a listed leak limiting device...

Page 12: ...ine as shown above A trap should be used to prevent sewer gas from being drawn into the unit See figure 24 and 25 Step 3 Check Adjust Water Level Check the water level in the sump tank The water level...

Page 13: ...the water supply line to the float valve in the unit Install the 1 2 in normally closed solenoid Valve A in the supply line as shown above Install the 1 4 in normally open solenoid Valve B between th...

Page 14: ...l the supply solenoid in the supply line upstream of the manual supply valve and below the roofline See figure 28 Step 2 Install Drain Line Solenoid Connect the drain line to the supply line between t...

Page 15: ...ation and maintenance of any coil Protective equipment such as safety glasses steel toe boots and gloves are recommended during the installation and maintenance of the coil IMPORTANT All field brazing...

Page 16: ...ate a large leak that should be isolated and repaired Step 1 Verify Nozzle Placement Inspect the refrigerant distributor and verify that the nozzle is in place The nozzle is generally held in place by...

Page 17: ...ping Optional IMPORTANT Guidelines for the installation of the cooling coil have been provided to insure proper performance of the coils and their longevity These are general guidelines that may have...

Page 18: ...Check Control System Before the unit is left in service the recirculation control system should be tested This can be accomplished by turning both knobs to the upper most pressure setting You may have...

Page 19: ...fluke com Thermometer Fluke 50 1 800 44 FLUKE www fluke com U Tube manometer Dwyer Slack Tube 1 219 897 8000 www dwyer inst com Tachometer Monarch Pocket Tach 100 1 800 999 3390 www monarchinstruments...

Page 20: ...ng varies per application NOTE The most accurate way to measure the air volume is by using a pilot traverse method downstream of the blower Other methods can be used but should be proven and accurate...

Page 21: ...PRESSURE PRESSION DE GAZ MAX DESIGN T T NORMALE EQUIPPED FOR CONCU POUR SCFM W C EXTERNAL STATIC PRESSURE PRESSION STATIQUE EXTERIEURE AGAINST CONTE Minimum and maximum gas pressures IMPORTANT This s...

Page 22: ...er air velocity over the burner is critical on direct fired gas units If the air velocity is not within the unit specifications the unit will not operate efficiently may have sporadic shutdowns and ma...

Page 23: ...the Low Fire Time Delay Set the low fire time delay to 75 of its maximum setting See figure 44 or 45 for the location of the time delay setting WARNING Do not set the burner maximum firing rate based...

Page 24: ...nd minimum fire may require the inlet air sensor to be initially set higher than desired in order to start the burner s Once high and low fire have been set the inlet air sensor should be turned down...

Page 25: ...ol controller is used and the desired space temperature See figure 48 or 49 Maxitrol Series 14 Discharge temperature control Set the discharge temperature 65 F Typical IMPORTANT The Maxitrol Series 14...

Page 26: ...ply and allow the pan to fill Adjust the float valve to shut off the water supply when the sump is filled to within 1 in of the bottom of the overflow See figure 52 Step 5 Check the Flow Rate The pump...

Page 27: ...igure 53 Step 3 Close Solenoid With the pressure set press the Function Key for one second to deactivate Flow Test Mode and allow the supply solenoid to close Step 4 Check Media Start the cooling cycl...

Page 28: ...loses and the drain solenoid opens to drain the supply line preventing possible freeze damage A drain solenoid is required for this option NOTE The Freeze Temperature is preset to the factory recommen...

Page 29: ...ed to low or high speed from a remote control panel One half or one third reduction motors are used Potentiometer Control A variable frequency drive is controlled by input from a remote speed selector...

Page 30: ...ch S3 Closed Power passes to N O ST1 which is energized and closed Power passes to inlet air sensor contact TS1 which is energized and closed if proper inlet air temperature is present Power passes to...

Page 31: ...d and drains the supply line between the supply solenoid and the media To activate Drain Mode simultaneously press the Function and Enter Keys To deactivate Drain Mode and unlock the drain solenoid si...

Page 32: ...or actuator to open fully or adjust limit switch Damper Limit Switch Jumper Missing Install jumper reference the units ladder diagram for terminals 24 Vac across terminals 6 and X Optional Exhaust Fan...

Page 33: ...ep 2 115 Vac across terminals 104 and 101 High Limit HLC1 Tripped Reset Replace High Limit HLC1 Check on cause of control loss Continuity across terminals 105 and 108 115 Vac across terminals 103 and...

Page 34: ...plug gap to 0 062 in Defective spark plug Replace spark plug Pressure drop across the burner between 0 60 and 0 675 in wc Adjust burner baffles Reference Direct Gas Start Up Step 3 Check burner pressu...

Page 35: ...ter Air velocity greater than specified Reduce the air velocity through the media Are the headers in place and located near the entering side of the media Replace headers and or move the headers Refer...

Page 36: ...l s unbalanced Clean and or balance wheel s Belts worn or loose Replace worn belts or tighten loose belts Reference V Belt drive maintenance in the maintenance section Yes Yes No No Yes Bearings worn...

Page 37: ...d Increase the factor to increase the water supply or decrease the factor to decrease the water supply Press the Enter Key to save the On Time Factor and return to the Program Menu Step 4 Exit Program...

Page 38: ...or drive misalignment will cause excessive bearing loads and may result in failure of the fan and or motor bearings IMPORTANT When replacing V belts on multiple groove drives all belts should be chan...

Page 39: ...2 inch bore size and 8 shots for 2 inch 5 inch bore size with a hand grease gun Adjust relubrication frequency based on condition of purged grease A high quality lithium based grease conforming to NL...

Page 40: ...IMPORTANT Replacement media should be from the same manufacturer and be the same size as the original media provided with the unit IMPORTANT When reinstalling the evaporative media make sure that it i...

Page 41: ...er appropriate tool Replace or tighten any loose or missing fasteners on the mixing plates Always use zinc plated or stainless steel fasteners Inspect and clean the flame and spark rod Occasional repl...

Page 42: ...ck if the coil is dry A mirror placed in the discharge will become fogged if moisture is present Repeat this procedure until the coil is dry and no fog appears on the mirror Let the coil stand for sev...

Page 43: ...___ Phone __________________ Fax ___________________ Work Done By ___________________________________ Name Plate Information Model ________________________________________ Volts ___________ Hertz ____...

Page 44: ...44 Date Time Notes Maintenance Log Maintenance Log Maintenance...

Page 45: ...45 Date Time Notes Maintenance Log Maintenance Log Maintenance...

Page 46: ...f Valve High Gas Pressure Test Port High Gas Pressure Switch Optional Modulating Valve To Burner Combination Shut off Valve Regulator Low Gas Pressure Test Port Low Gas Pressure Switch Optional Gas Co...

Page 47: ...when pressure drop is above field adjustable set point 6 Terminal Strip 24 Volt power strip for control wiring 7 Main Disconnect On Off switch provides single point power connection to unit 8 Groundi...

Page 48: ...prove defective during this period they should be returned to the nearest authorized motor service station Greenheck will not be responsible for any removal or installation costs As a result of our co...

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