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TECHNICAL QUIETSIDE

TECHNICAL QUIETSIDE. DPW Dual Purpose Water Heating Season 2008/2009. QS-DPW-CT-001. DPW Condensing DPWH. Basic Model Features 2 models 99k & 120k Btu/h inputs Tested AFUE of 90% Provides both Heating and Domestic Hot Water from one unit

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TECHNICAL QUIETSIDE

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  1. TECHNICAL QUIETSIDE DPW Dual Purpose Water Heating Season 2008/2009 QS-DPW-CT-001

  2. DPW Condensing DPWH • Basic Model Features • 2 models 99k & 120k Btu/h inputs • Tested AFUE of 90% • Provides both Heating and Domestic Hot Water from one unit • Modulating induction fan and gas valve for complete control • Wet recuperative heat exchanger to allow condensing to reduce • (<140 DegF) exhaust gas temperature allows venting in Schedule 40 PVC

  3. What is a Dual Purpose Water Heater • A Dual Purpose Water Heater is a unit that will provide both heating water for space heating and also potable domestic hot water for washing from a single unit without any additional controls required • Domestic hot water is given priority over the space heating, and is activated by flow through the domestic hot water system • DHW is “on demand” and continuous, it will be provided as long as the faucet is open • Once DHW call is completed the unit will revert to heating the house as required

  4. What is a Dual Purpose Water Heater • The Closed Loop Heating system and the Potable DHW system are • COMPLETELY SEPARATED FROM EACH OTHER • No Check Valves or other Hydronic components are required for this unit to provide both heating and DHW • This makes this system a true and better alternative to taking a tankless water heater and then adding the necessary components to enable it to provide space heating

  5. What is a Dual Purpose Water Heater • It is not called a Boiler in North America unlike the rest of the world, this is because • It does not provide closed loop heating water at a temperature above 176 DegF • It does not have an ASME H stamp, therefore cannot be used in areas where this is a requirement • Internal Water Volume is less than 1 gallon • Therefore these units are certified by ANSI Z21.10.3-2004/CSA 4.3-2004 as a gas water heater

  6. Applications – Hydronic Heating • 1. Radiant Heating : • Almost the perfect application for this unit • Low water temperature adds efficiency to the system • Low water volume suits these ultra low mass type of units • However the only issue is not to slice the zones to thin as this can lead to short cycling of the unit when few zones are calling

  7. Applications – Hydronic Heating 2. Fan Coils : Good application For maximum efficiency ensure that return temperature is low enough to allow high efficiency operation Use an aqua stat on the air handler to allow indoor fan to cycle off when in DHW mode May need 24VAC SPST relay to interface For Air handlers (even one) with or without pumps we must use the Quietside Primary/Secondary piping arrangement

  8. Applications Hydronic Heating • 3. Baseboard : • Standard US Baseboard temperature is 180 plus DegF • IF baseboard is sized using these temperatures • Quietside DPWH can only make 176 DegF MAXIMUM inside the unit – Typically temperature delivered into the loop is approx 165 DegF • SO – We may need to add additional lengths of baseboard to the house

  9. Applications Hydronic Heating • 3. Baseboard (Cont): • ∆T and Hi Flow rates can cause problems maintaining temperature in the system • We recommend designing system for a loop ∆T of 20 to 25 DegF to allow the system to inject enough 160/165 DegF water into the loop to maintain temperature and comfort • Return temps above 140 DegF back to the DPW significantly reduce efficiency and condensate production • Therefore care is required as may not be the best possible application, especially in a true retrofit scenario

  10. Applications Hydronic Heating • 4. Cast Iron Horizontal Radiator Panels • See baseboard issues regarding the water temperatures and ∆T delivered at maximum from the DPW • Very high water volume when compared to a radiant or AHU application • This can create flow issues and expansion tank sizing problems for the Quietside unit • Return temps above 140 DegF back to the DPW significantly reduce efficiency and condensate production • Therefore not a preferred application, without careful planning prior to installation

  11. Which size of DPW? • HOW TO SIZE THE UNIT • 1. Size the unit to the heating load of the house • THEN • 2. Size the unit to the domestic hot water usage of the household. • Use the total max DHW load possible, • i.e. count all of the faucets or appliances that can be used at a single time, that will be your max DHW load, e.g. Shower and faucet, Shower and Laundry etc etc etc

  12. Which size of DPW? • IT IS NOT ACCEPTABLE TO JUST PICK THE LARGEST UNIT IN THE RANGE BECAUSE OF THE DHW REQUIREMENT • We must ensure that the unit will modulate down to meet the heating load of the house, providing that the load is above minimum modulation level • Short cycling will reduce efficiency and promote component wear

  13. Sizing the DPW unit • Q : What is the MINIMUM OUTPUT capacity of a DPW? • A : DPW 099 – 47,000 Btu/h • DPW 120 – 47,000 Btu/h • Values based on net IBR calculations

  14. But I have small Zones? • Q : My smallest zone is 10,000 Btu/h what can I do to prevent short cycling of the unit? • A : Quietside recommends that the smallest zone on the system should be 25% of the rated unit input or 60% of the minimum output shown in the previous slide • In the above case we either need to increase the size of the zone in question or ………………..

  15. Get a Buffer • Quietside offers a 20 Gallon buffer tank • DPW maintains the tank temperature and then system pump (field installed) acts as a primary loop pump • Prevents the DPW from short cycling

  16. Sizing the DPW unit, Part 2 • DHW Production : DPW099

  17. Sizing the DPW unit, Part 2

  18. Sizing the DPW unit, Part 2 • Q : Still not enough DHW Production?? • A : The DPW can be used very easily in conjunction with a storage tank for an instant supply of DHW – An old electric or gas water heater works very well • Use a bronze re-circ pump for temperature control in the tank • OR • Use the Quietside range of Storage tanks which include all of the parts required

  19. Sizing the DPW unit, Part 2 • Quietside Storage Tank • 20 Gallon • Comes complete with • Bronze pump • Mixing Valve • Check Valves • Aquastat to control pump etc

  20. But I want to use a Tankless • Homeowners want to a unit to provide between 6 and 8 GPM of DHW, without a tank • All of these units MUST have a Max Input of between 180,000 Btu/h and 240,000 Btu/h for this level of performance • DPW has a maximum Input of 120,000 Btu/h with a 90,000 Btu/h being sufficient to heat most houses

  21. I want my 8 GPM • Gas Pipe Sizing becomes an issue • Standard House Construction (approx) • Boiler/Furnace 135,000 Btu/h • Storage Water Heater 40,000 Btu/h • Range/Fireplace 30,000 Btu/h • Total 205,000 Btu/h • This requires a maximum gas pipe size in the house of 1” giving full capacity at 80ft of gas piping in the house

  22. I want my 8 GPM • Gas Pipe Sizing using a DPW with a tank • DPW (Largest) 135,000 Btu/h • No storage Water Heater required • Range/Fireplace 30,000 Btu/h • Total 165,000 Btu/h • This requires a maximum gas pipe size in the house of 1”, with ¾” through most of the house giving full capacity at 80ft of gas piping – no change needed for a retrofit

  23. I want my 8 GPM • Gas Pipe Sizing using a Tankless for DHW • Water Heater 230,000 Btu/h • Furnace or Heating unit 135,000 Btu/h • No storage Water Heater • Range/Fireplace 30,000 Btu/h • Total 365,000 Btu/h • This requires a minimum gas pipe size in the house of 1 ½” to giving full capacity at 80ft of gas piping in the house

  24. But I want to use a Tankless

  25. But I want to use a Tankless • Added Cost • Pump Taco 007 • Expansion Tank • Brazed Plate • Flow Switch • Check Valves • Plus the venting……………………….

  26. DHW & Well Systems • Pump is required in a Well application • Pressure changes during DHW use can cause flow/temperature changes of DHW from DPW • Reduce differential on well Pump to minimize OR • USE A QSDHS STORAGE TANK to prevent this

  27. Installation and Start Up

  28. Locating the DPW unit • Must be in an indoor location • Ensure that the temperature in that location does not fall below 45 DegF • Ensure that the Indoor humidity levels do not exceed 80% • Stay within the venting limitations, total equivalent length of 45feet, less elbows etc • Requires a solidly grounded dedicated 115V power supply • Ensure that a correctly sized gas pipe is available

  29. Installing the DPW • Remove unit from Carton • Unit installs on a hanging bracket mounted to studs or wall brace • CANNOT be installed on a combustible wall. Use non combustible backing plate e.g. Durarock or 24g sheet metal • Pipe condensate directly to the building drain • Comply with stated clearances to other appliances

  30. Installing the DPW – Water Connections, Left to Right Heating Water Return : ¾” Male Union DHW Cold Inlet (or tank) ½” Male Union DHW Supply to house : ½” Male Union Heating Water Supply : ¾” Male Union DO NOT OVER TORQUE!!

  31. Installing the DPW – Gas/Vent • GAS LINE SIZE MINIMUM OF 3/4”, flexible pipe to connect is acceptable providing it has a minimum capacity of 250,000 Btu/h • Drip leg required to prevent dirt entering gas valve • Venting : 3” Diameter • Intake and Exhaust is standard – connections go directly to 3” PVC • PVC cement, then seal around vent connection with high temperature silicone to prevent leaks

  32. Installing the DPW • EXPANSION TANK AND PRIMARY LOOP PUMP INCLUDED • Expansion Tank is equivalent to a standard 20 Gallon • Check your requirement for expansion especially if you are doing an old gravity system • Primary Loop pump, maximum flow through the Primary Loop is approximately 3.5 GPM • If you are using a higher flow on the system side it will blend down the temperature delivered in the heat emitters

  33. Installing the DPW • Manual feed valve included on the unit – no pressure setting however it does have a check valve • Always installed an approved Boiler Feed Valve on the closed loop system • Make sure that Backflow prevention is included • Taco 335 or 329 is ideal • Screw the Quietside feed valve closed and do not open it

  34. Installing the DPW • Automatic Air vent included inside unit • Air Elimination is very important with these types of units • ALSO INSTALL ADDITONAL VENT AT HIGHEST POINT – AIR REMOVAL IS SINGLE LARGEST CAUSE OF FAULT CODES

  35. Installing the DPW • Note : THE PLASTIC SIPHON AT THE FRONT OF THE UNIT • IT MUST BE FILLED PRIOR TO THE START UP OF THE UNIT Fill To Here

  36. Venting the DPW • When installing the venting ensure that the Exhaust Flue is sloped back to the DPW approx 1” per 2ft horizontal to allow condensate from exhaust gases to return to the unit for draining – this will also reduce the build up of ice on the termination during cold weather • Install termination snout to reduce ice build up, caulk around the snout • Install 90 Deg Elbow and birdscreen on the inlet air pipe

  37. Vertical Venting the DPW • Respect the maximum vent lengths and elbows • Always use 2 x 45 Deg Elbows on flue pipe • Use the snout that is provided with the unit for the flue pipe • 2 x Elbows are used on the Inlet pip providing they are in the same barometric plane, don’t forget the birdscreen • Vertical Venting addendum to IOM available on request

  38. DPW Circulation Pump • The pump in the DPW has to overcome the head losses of the unit Heat Exchangers • Therefore the external head available to the system is much less than the gross pump curve printed, in addition the system is designed for higher ∆T’s than standard US Cast Iron boilers Unit Flow Rate @ 15Ft External Head DPW 099 2.1 GPM DPW 120 2.2 GPM

  39. DPW Water Piping • THEREFORE WE MUST PIPE THE UNIT AS • FOLLOWS, NO IF’S, AND’S OR BUT’S • With a PRIMARY/SECONDARY LOOP with the unit injecting hot water into the secondary loop to be circulated by the loop pump(s) • We also have found that using additional pumps in series does not work well with the DPW • If retrofitting simply remove old unit – replace with pipe and Tees and then pipe up to DPW like this…..

  40. DPW Water Piping

  41. DPW Water Piping

  42. DPW Water Piping

  43. DPW Water Piping

  44. Power Wiring the DPW • Power Wiring • 115V, 15 Amp dedicated circuit is required • Circuit and unit must be grounded • Unit has internal 3 Amp glass buss style fuses to protect the Microprocessor and other components • Seal around connection to prevent leakage

  45. Zone Controlling the DPW • Several ways to for zone control of the units • Taco/Argo style zone controller • SR501 switching relay • SPST Relays allow interface with 24VAC Thermostats – e.g. Fan Coils

  46. Zone Control Panel Wiring

  47. Zone Switching Relay Wiring

  48. Zone Switching Relay Wiring

  49. SPST Relay Wiring

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