background image

 

P-K DURATION II 

™ Indirect Domestic Water Heating System 

 

12 

3.4.4 

Domestic Water Piping (Simplified) 

The  P-K  Duration  II  system  features  constant  recirculation  on  the  domestic  hot  water  piping.    This  circulation 
pump  offers  3-speed  operation  that  can  be  selected  by  the  operator.    Constant  circulation  on  the  domestic  hot 
water side offers several advantages: 
 

 

“Primes” the DHW loop ensuring the discharge water is at the correct temperature. 

 

Maintains accurate temperature readings by maintaining flow across the temp gauges and RTD. 

 

Minimizes heat exchanger scale formation by maintaining velocity across the plates. 

 

Inhibits bacterial growth by preventing stagnant water conditions. 

 
As domestic hot water is consumed throughout the building, hot water will exit the Duration II in the lower copper 
piping (red arrow) and fresh makeup water will enter in the upper copper piping (blue arrow). The recirculation 
pump circulates water through the heat exchanger to reduce the amount of hot spots that may form on the heat 
exchanger, and keep the velocity to prevent scale build it. The recirculation path is indicated by the orange arrow 
(Middle). 
 

3.4.4.1 

Domestic Water Piping Figure 

 

 

 

Summary of Contents for P-K DURATION II D2DW-30(S/D)

Page 1: ...ANEOUS INDIRECT DOMESTIC HOT WATER SYSTEM Model _______ Serial ______________________ Start Up Date _______________________ Harsco Industrial Patterson Kelley 155 Burson Street East Stroudsburg PA 183...

Page 2: ...P K DURATION II Indirect Domestic Water Heating System 2...

Page 3: ...nd Storage 7 3 2 Compliance with Codes 8 3 3 Setup 8 3 4 Mechanical Connections 9 3 5 Electrical Connections 15 3 6 Pre Start Check List 16 3 7 Safety Checks 16 4 OPERATION 17 4 1 LOVE Controller 17 4...

Page 4: ...any system Harsco Industrial Patterson Kelley cannot be responsible for the design or operation of such systems and a qualified engineer or contractor must be consulted 2 SAFETY 2 1 GENERAL The P K Du...

Page 5: ...ntact Harsco Industrial Patterson Kelley Technical Service at 570 476 7261 or toll free at 877 728 5351 2 3 SAFETY FEATURES It is the responsibility of the customer to maintain the safety features suc...

Page 6: ...Burn hazard Hot fluids Use caution when servicing or draining the P K Duration II system Isolation valves are provided on all inlets and outlets for your convenience Close the applicable isolation val...

Page 7: ...d by a qualified installer service agency or gas supplier 3 1 RECEIVING AND STORAGE 3 1 1 Initial Inspection Upon receiving the P K Duration II system inspect it for signs of shipping damage Since som...

Page 8: ...piping is constructed and stamped in accordance with ASME Boiler and Pressure Vessel Code Section VIII with a standard 150 psig set pressure 3 3 SETUP 3 3 1 Foundation and Placement Provide a firm lev...

Page 9: ...omestic hot water capacity in a 32 wide x 64 long footprint and requires four 4 piping connections to operate as seen below A DHW Supply 2 Sweat Ball Valve B DHW Return 2 Sweat Ball Valve C Boiler Wat...

Page 10: ...th the curved red arrow middle 3 4 2 1 Boiler Piping Figure As the domestic hot water supply temperature drops below the desired setpoint the control valve actuates allowing the flow of hot boiler wat...

Page 11: ...mage which shows the manifold The Boiler water is piped to each heat exchanger from one connection point limiting the requirement for multiple connections provided the same boiler water is required to...

Page 12: ...ining flow across the temp gauges and RTD Minimizes heat exchanger scale formation by maintaining velocity across the plates Inhibits bacterial growth by preventing stagnant water conditions As domest...

Page 13: ...er heating system does not require a domestic water storage tank if hot water is constantly available for the 3 way valve If using in conjunction with a boiler the initial call for heat takes time unt...

Page 14: ...Domestic Water Flush the domestic water periodically by using the drain valve located on the DHW supply line Bottom At the same time the strainer should be checked and cleaned properly NOTICE Under no...

Page 15: ...rain valve on the boiler water strainer once a steady flow of water occurs STEP 5 Open the manual isolation valves on the inlet of the boiler piping STEP 6 Check for any leaks in all piping connection...

Page 16: ...mpt to operate a P K Duration II system that has failed to pass all the safety checks described below After checking controls by manual adjustment make sure they are always reset to their proper setti...

Page 17: ...is changed The up and down buttons are used to change the values of the parameters 4 1 1 Controller Operation To change the setpoint press the up or down buttons to change SV to the desired value Once...

Page 18: ...llustrate the correct positioning for the various valve actuators NOTICE For water to water applications or when valve is oversized equal percentage valves are the preferred type 4 2 1 Siemens Valve A...

Page 19: ...g information 5 1 2 Weekly Check for leaks in the boiler piping and the domestic piping Correct immediately if discovered 5 1 3 Monthly Check all relief valves by slightly opening the stem Once you se...

Page 20: ...circulator pump Be sure water is flowing through the recirculation pipe Check valves in pipe line must be operational Check for proper boiler water flow 5 2 5 Domestic water temperature is too high or...

Page 21: ...DED SPARE PARTS Circulator Pump bearing and seal assembly Dial Thermometers Temperature sensor RTD Temperature Controller Relief Valve Thermostat for over temperature control Use of Non Factory Author...

Page 22: ...P K DURATION II Indirect Domestic Water Heating System 22 6 2 WIRING DIAGRAM...

Page 23: ...TION II Indirect Domestic Water Heating System 23 6 3 MODELS 6 3 1 Boiler Piping CALLOUT TAG PART DESCRIPTION 1 3 WAY ELECTRONIC CONTROL VALVE 2 2 BALL VALVE 3 WYE STRAINER 4 STRAINER BLOW DOWN VALVE...

Page 24: ...ye Strainer 2 2 Pressure Gauge XX XX PSI 3 Temperature Gauge XXF XXF 4 Automatic Air Vent 5 Section VIII Pressure Only Relief Valve 6 2 Ball Valves 7 Wye Strainer Blow Down Valve 8 Recirculation Pump...

Page 25: ...rect Domestic Water Heating System 25 6 3 3 Control Panel and Heat Exchanger TAG NUMBER PART DESCRIPTION 1 POWER LIGHT 2 HIGH LIMIT LIGHT 3 DISCONNECT SWITCH 4 TEMPERATURE CONTROLLER 5 FUSES 6 HEAT EX...

Page 26: ...ovided by Seller the defective item will become the property of Seller Transportation to Seller s facility or other designated facility for repairs of any products or party alleged defective shall in...

Page 27: ...val installation or reinstallation charges any material and or permits required for installation reinstallation or repair charges to return the boiler and or components L INCIDENTAL SPECIAL OR CONSEQU...

Page 28: ...P K DURATION II Indirect Domestic Water Heating System 28...

Reviews: