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010.4150.0720  08.21

4.  MECHANICAL INSTALLATION

4.1 GENERAL

WARNING

Failure to install, maintain and/or operate the 
VHX-DR Heat Recovery Center in accordance 
with the manufacturer’s instructions may result 
in conditions which can produce bodily injury 
and property damage.

The VHX-DR must be installed by a qualified installer in 
accordance with these instructions and all local codes, or in  
their absence, with the latest edition of The National Fuel Gas 
Code (NFPA54/ANSI223.1), NFPA 211, NFPA 31 or Canada 
CAN/CSA-B149.1-05 National Gas and Propane Installation 
Code when applicable. The VHX-DR must be mounted so 
the clearance to combustibles is at least 18 inches.
Preferably, the VHX-DR should be installed as close to the 
heating appliance as possible — vertically or horizontally in 
the breeching. It can also be installed near the termination 
or on a roof. In addition, it can be used for sidewall 
vented applications where it discharges through a wall. A 
condensate drain is provided with the VHX-DR to be installed 
by the user.
The VHX-DR is for indoor and outdoor installation. If installed 
outdoors, steps must be take to prevent freezing 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, NFPA211 and Canada CAN/CSA-B149.1-05.  

4.2 POSITIONING

Consult “2. Specifications” for specific weights and 
dimensions to ensure a well designed and safe installation 
when either hanging or supporting the exchanger. The 
exchanger is shipped ready to be mounted in the vertical or 
horizontal position. Make sure to check the actual number of 
lugs and their positions on the spec drawings before planning 
the installation.
For existing retrofit installations, ensure that the combustion 
source has been turned off and has cooled. A condensate 
drain connection is provided at the bottom of the unit. 
Header manifold inlet/outlet connections for water supply and 
return are optional. For retrofit installations the economizer is 
installed in line with the existing exhaust stack or duct unless 
otherwise noted
Generally a section of the exhaust stack is removed to 
accommodate the insertion of the economizer. The remaining  
portion of the exhaust stack above the cut should not exceed 
a static load of 500 lbs. or exert any moments on the outlet  
flange, and must be adequately supported. 
In some cases the economizer may be placed directly on top 

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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