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Quietside ODW 099A-199A

Quietside ODW 099A-199A. Sizing, Installation November 2008. Agenda. Product & Features What Size & Flow rates What’s needed for installation Gas Pipe Sizing Hanging on the wall Water Piping Condensate piping Venting Power wiring Control Wiring Start up Checking operation

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Quietside ODW 099A-199A

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  1. Quietside ODW 099A-199A Sizing, Installation November 2008

  2. Agenda • Product & Features • What Size & Flow rates • What’s needed for installation • Gas Pipe Sizing • Hanging on the wall • Water Piping • Condensate piping • Venting • Power wiring • Control Wiring • Start up • Checking operation • Maintenance • Troubleshooting

  3. ODW 099A – 199A

  4. Line Up • 4 models in 2 Chassis sizes • 099 & 120 : Smaller capacities designed for lighter demand applications – Condos, apartments, cottages, townhouses or houses where low to medium demand exists • 180 & 199 : High capacity for higher demand application - larger residences or any application where “performance bathing or showering” is in place

  5. Modulation Range • ODW 099A : 18,000 to 99,000 Btu/h • ODW 120A : 18,000 to 120,000 Btu/h • ODW 180A : 26,000 to 180,000 Btu/h • ODW 199A : 26,000 to 199,000 Btu/h

  6. Why ODW? • Efficiency, Energy Factors above 0.9 (Energy Star approved • Condensing water heater, Flue Gas temperature below 136DegF allows venting in Schedule 40 PVC • Stable Delivered Water Temperatures • Rebates!!!!!!

  7. Delivered Water Temperature Control • A stable delivered water temperature is of paramount importance • We have 3 temperature sensors on this unit • Entering Cold Water temperature • Water temperature exiting the Heat Exchangers • Delivered Water temperature

  8. Delivered Water Temperature Control • 2 Control valves are used • Flow Control Valve • Measure the flow rate through the unit and report back to the main controller • Minimum flow rate for operation is 0.7 GPM

  9. Delivered Water Temperature Control • Bypass Control Valve • This valve allows water to flow from supply to delivered water without passing through the heat exchanger

  10. Why Bypass Control? • Mixing in some cold water allows for a stable delivered water temperature, no peaks and troughs due to burner modulation • Increases flow rate as we can provide a mixed condition water temperature • Provides flow control in times of extremely high flow rates

  11. End Result • Exactemp • Reduced temperature fluctuations compared to competition and previous iterations of Tankless Water heaters

  12. Sizing your ODW

  13. Sizing is simple • Sizing takes into account the number of fixtures and type of hot water uses in the house, plus the number of occupants • How many, what is the expected flow rate through them, and how many could/will be used simultaneously • Total this and this is your max flow, then……

  14. Sizing – Bathing • Typical Shower is 2.5 GPM, 1.5 GPM for Lo Flo Heads • Body Sprays : 2 to 2.5 GPM • Roman or Whirlpool Tubs : 4 to 8 GPM • Will any showers or tubs will be running at the same time?

  15. Sizing – Other Uses • Faucet is 0.75 GPM • Dishwasher, 1.5 GPM • Washing Machine, 2 GPM • Will we use Dishwasher, Washing Machine simultaneously with showers etc

  16. Sizing • Once we have the number of hot water uses, plus how the lifestyle of the household affects hot water usage we can calculate a maximum flow rate • This number is then used for the second step • Example of sizing • 2 people household – 2 baths • Bath 1 : Shower Head – standard flow, Hand Held, Body Sprays • Bath 2 : Shower Head – standard flow • 4 Faucets • Washing Machine • Dishwasher

  17. What’s the groundwater temp? • Q : Why is that important? • A : For a fixed delivered water temperature the max flow rate available for a given Btu/h varies based on the difference in temperature between the cold water and the required set point • This is called ∆T and is one of the most important items to know when sizing an ODW unit

  18. Performance ODW-099A

  19. Performance – ODW 120A

  20. Performance – ODW 180A

  21. Performance – ODW 199A

  22. Don’t just select the largest unit • Even though it is tempting don’t just select the largest unit available • Unit modulation may cause it to cycle at combinations of very warm incoming water and low water flow rates • Also we need to make sure that the gas supply piping is correctly sized

  23. Water Requirements • Water Quality These are the maximum values of the minerals in the water Having higher levels of these minerals can cause furring of the Heat Exchangers plus reduced efficiency

  24. Water Requirements • What to do about Water Quality Service the unit (frequency dependant on water quality) Or Treat the water before it enters the water Several different methods available over the counter

  25. What do you get included? • Unit, set up for Natural Gas operation • Unit Controller • Vent Termination kit, including co-axial flue, termination kit • Isolation kit, includes Ball Valves, purge valves and ASME rated Pressure Relief Valve

  26. What do you supply? • Gas piping, minimum ¾” but selected for the Btu/h input capacity of the unit • Schedule 40 PVC venting including Elbow and Bird Screen for vent • Water piping from cold supply to unit and hot water piping to house • 115V power, power wiring and thermostat wire to the controller(s)

  27. Installation basics • Indoor location only – the unit doesn’t like getting wet • Minimum ambient temperature above 45 DegF, even with the freeze protection heaters • Respect the necessary clearances to the front, sides, back, top and bottom of the unit

  28. Gas Piping - Basics Natural Gas Pressure - Primary • 3.5” to 10.5” WC LP Gas Pressure - Primary • 8” to 13” WC • Gas meter must be capable of supplying total gas demand for the residence • Gas pressures below the minimum will reduce performance • Ensure gas pressure does not drop on initial start or unit may become noisy in combustion • Do not use Flexible Gas Lines unless they are rated for a Minimum capacity of 250,000 Btu/h

  29. Gas Piping - Basics • Gas pipe size is determined by two factors • Max Input capacity of the appliance connected • Distance from the Gas meter The larger the appliance and the further away from the meter the larger the gas pipe size

  30. Gas Piping - Sizing • Determine where the unit will be installed on the gas pipe • Closer to the meter is always better • If unit is located at furthest point from the meter considering running a dedicated stick of black iron directly from the meter to the ODW

  31. Gas Piping - Basics

  32. Gas Piping – Sizing

  33. Gas Piping - Sizing

  34. Gas Piping - Sizing • Connection from the stick to the unit • If using flexible gas piping make sure it is capable of supplying a minimum of 250,000 Btu/h • Always install a gas shut off valve and drip leg adjacent to the unit

  35. Hanging the unit on the wall • Remove unit from Carton • Unit installs on a hanging bracket (supplied) 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

  36. Water Piping (cont) • Cold Water inlet including strainer • Hot Water outlet

  37. Water Piping • 2 Connections – Cold In, Hot Out • ¾” Isolation Valve package included with the unit • Ball Valves, Purge Valves, 150 Psi Pressure Relief Valve ¾” threaded connection • ODW 099/120 includes a ½” adaptor from the isolation valve kit – but ¾” connection to the house

  38. Water Piping (cont) • Isolation Valve kit includes a Pressure Relief Valve to meet code requirements, rated at 150 psi • Pipe PR Valve to building drain or other suitable area • A Temperature Relief Valve is not required unless local codes mandate it – however if one is installed do not install with the probe directly in the water flow

  39. Water Piping (cont) • Unit is designed for Potable water only, therefore all piping should be suitable – Copper, PEX (where allowed by code), etc • If the unit is providing potable hot water, it cannot be connected by code to a heating system using non-potable components or chemicals • Make sure cold water feed pressure is above 14 Psi and below 125 Psi – if outside that range installing a pump or de-pressurizing pump

  40. I want “Instant” Hot Water! • Recirculation – Based on time or temperature • Pump sized to push water through the unit to remove the cold plug contained in the lines • Taco Dmand system • Unit takes 3 seconds to go from sensing flow to firing. This is a big advantage over other Tankless Water Heaters, reduces cold water sandwiching

  41. Condensate Piping • Unlike other Tankless water heaters the ODW is a condensing model • Therefore it will produce condensate which has to be drained away • The condensate siphon inside the unit must be filled prior operating – Without filling flue gases can enter the home

  42. Useful advantages of condensing • Lower Flue gas temperatures • ODW maximum flue gas temperature is 136 DegF • This allows venting in Schedule 40 PVC in all states and provinces, with zero clearance • This is a big advantage over other Tankless Water Heaters, required to be vent in single wall stainless steel (which is not B vent)

  43. Venting • Description – Sealed combustion or Direct Vent • Both Intake and Exhaust air must be provided to the unit • Ø3” for 099 & 120 • Ø4” for 180 & 199

  44. Venting • Maximum vent length is 45ft equivalent, this is a per pipe length not a total • Maximum 3 Elbows in vent pipe • Each Elbow = 5ft of straight pipe, therefore with 3 Elbows in the system the maximum length of straight pipe is 30ft

  45. Vent Connection on unit • Plastic connection to accept either 3” or 4” vent pipe directly on top of the unit • Approved PVC cement is required to bond the two together • Use Hi Temp Silicone seal on the joint to ensure a full seal

  46. Vent Piping • Always slope flue pipe back to the unit – 1” in 12” minimum • This allows any condensate produced in the flue pipe to return to the unit and drain through the condensate system • Prevents growth of ice stalactites on the outside of the building penetrations through the building required • Zero Clearance to combustibles

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