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010.4150.0720  08.21

Fig 9

Fig 7

5.  PLUMBING

5.1 GENERAL

It is not within the scope of this manual to provide specific 
plumbing installation instructions as the installation should 
follow the design specifications of the design engineer, 
architect, or contractor. However, measures must be taken 
to prevent the water from stagnating within the economizer 
while the boiler(s) are in operation.  Also, the water side of 
the economizer must be kept free of grease and other foreign 
material which can shorten the life of the economizer and 
possibly interfere with the operation of controls and safety 
devices. Proper feedwater treatment is a major factor in 
preventing economizer failure.
Only low sulfur fuels should be used with the VHX-DR.  if 
fuels other than natural gas are used, there is a risk of “cold 
end corrosion” when the entering water temperature falls 
enough to cause condensation of the flue gases so verify the 
feasibility of the application with the design engineer prior to 
installation.
Generally, schedule 40 steel pipe is used in the piping 
installation. In some applications other piping material may be  
needed. Consider the type of liquid, operating pressures and 
temperatures, and any corrosive elements in the liquid or in 
the atmosphere when determining the best piping material 
for your installation. The use of valves is recommended 
where isolation might be required. Non-ferritic piping is 
recommended if using non-deaerated water.

5.2 CONNECTING PIPING

Actual piping depends on how the heating modules are 
configured. Water should flow counter flow to the exhaust.
If the heat modules are connected to a common header, 
supply and return liquid pipes must be connected directly to 
the common header. This is shown in Fig 7. Balancing valves 
should be installed in order to ensure that the flow is equally 
distributed.
If the VHX-DR is used for multiple applications, e.g. one heat 
module is used for domestic water while the other is used 
for boiler feed-water, each application must be connected 
directly to the supply and return connections on the heat 
module. See Fig 8.
Liquid connections are connected with NPT threaded fittings. 
The maximum allowable connection loads given in Fig 9 are 
valid for low cycle fatigue. If high cycle fatique is involved, a 
special analysis should be carried out
Liquid piping should include shut-off, drain and bypass valve 
piping in the event the exchanger is required to be isolated. 
Drain piping should include valves of dependable 
manufacture in order to further reduce the possibility of an 
undetected leak.

Outlet

Headers

Flexible 

Water Connection

Inlet

Fig 8

Max. Bending Torque

Torque Moment

Connections

20 Nm

70 Nm

Summary of Contents for VHX 1600-22DR

Page 1: ...perating Manual ENERVEX VHX DR VORTEX HEAT RECOVERY CENTER ENERVEX Inc 1685 Bluegrass Lakes Parkway Alpharetta GA 30004 USA P 770 587 3238 F 770 587 4731 T 800 255 2923 info enervex com www enervex co...

Page 2: ...esigned to show how a basic burner operates Operating controls will normally function for long periods of time and we have found that some operators become lax in their daily or monthly testing assumi...

Page 3: ...12 5 4 Safety Relief Valves 12 5 5 Mouting of Flow Meters if applicable 12 5 6 Special Installation Considerations 12 6 ELECTRICAL INSTALLATION 6 1 General 14 6 2 Modulating Bypass Damper 14 7 STARTUP...

Page 4: ...tric volume flows with exceptionally high performance and are mounted in individual slots an easily serviceable configuration A modulating multi blade damper design provides bypass capabilities for us...

Page 5: ...y to the carrier within the allowable time limit The VHX DR product line units are shipped on pallets To remove the economizer first position the unit while either still in the shipping container or o...

Page 6: ...Type Cross 30 140 Cross 30 140 Cross 30 140 Cross 30 140 Cross 30 140 Cross 30 140 Cross 30 140 Heat Exchanger Plate Surface Area Ft2 416 624 832 1040 1248 1456 1664 Operating Pressure Max PSI 230 Wat...

Page 7: ...ng The liquid flow must be constant and with sufficient pressure to keep its evaporating boiling temperature above the plate temperature Local evaporation boiling will adversely affect heat transfer a...

Page 8: ...reezing of water in the VHX DR housing and pipes see Section 4 3 The vent pipe must be installed and supported according to the chimney manufacturer s instructions and or in accordance with NFPA54 NFP...

Page 9: ...er depends on the model please refer to the specification drawing for the specific VHX model Apply expansion joints supplied by others as required by the installation to ensure that no outside forces...

Page 10: ...duction in heat recovery Eventually if the reduction is inadequeate the damper will open completely which will make the exhaust flow bypass the heat modules Fig 4 Fig 6 4 5 CONNECTION TO THE CHIMNEY B...

Page 11: ...in the atmosphere when determining the best piping material for your installation The use of valves is recommended where isolation might be required Non ferritic piping is recommended if using non de...

Page 12: ...Valve s is required for every installation In a system with headers they must be installed according to Fig 13 NOTE The safety relief valves must be located between any isolation valves and the VHX DR...

Page 13: ...id connections interfere with the opening of recovery unit trays Economizer relief valves shall not have set pressure ratings higher than the rated pressure of the heat modules Liquid storage tank rel...

Page 14: ...otected from physical damage 6 2 MODULATING BYPASS DAMPER The only electrical part of the VHX DR is the actuator serving the Modulating Bypass Damper The actuator can be controlled by a 0 10VDC signal...

Page 15: ...he exchanger is in a clean like new condition note and record the following at a specified condition Liquid inlet and outlet temperatures Exhaust gas inlet and outlet temperatures Pressure gauge readi...

Page 16: ...2 Remove all bolts from the cover plate 3 Remove the cover plate which gives full access to the heat modules 4 Slide modules out individually 8 3 MAINTENANCE The module has no moving parts or electri...

Page 17: ...dry dirt such as carbon ashes or dust most of the dirt sticks to the inlet surface Cleaning with compressed air or high pressure water up to 200 bar is normally effective Exhausts from diesel vegetab...

Page 18: ...18 010 4150 0720 08 21 9 APPLICATION EXAMPLES 9 1 PREHEATING BOILER RETURN WATER 9 2 PREHEATING CIRCULATING FEED WATER...

Page 19: ...19 010 4150 0720 08 21 9 3 PREHEATING BOILER MAKE UP WATER 9 4 PREHEATING STEAM BOILER FEEDWATER WITH MODULATING FEED WATER VALVE...

Page 20: ...20 010 4150 0720 08 21 9 6 CONDENSATE RETURN HEATING 9 5 CIRCULATING MAKE UP WATER HEATING...

Page 21: ...21 010 4150 0720 08 21 9 7 CALORIFIER HEATING LOOP 9 8 PROCESS WATER HEATING...

Page 22: ...let and outlet flue temperatures are constantly monitored and the bypass damper will dynamically respond to water outlet temperature The HRC80 features a series of set points allowing maximum flexibil...

Page 23: ...23 010 4150 0720 08 21 Notes...

Page 24: ...ENERVEX Inc 1685 Bluegrass Lakes Parkway Alpharetta GA 30004 USA P 770 587 3238 F 770 587 4731 T 800 255 2923 info enervex com www enervex com 010 4150 0720 07 21...

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