Bryant 50YEW Design Manual
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Bryant 50YEW Design Manual

Bryant 50YEW Design Manual

Water-to-water system
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WATER-TO-WATER
SYSTEM DESIGN GUIDE
50YEW, 50PSW, & GSW
W H AT E V E R I T TA K E S .
WATER-TO-WATER SYSTEMS

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Summary of Contents for Bryant 50YEW

  • Page 1 WATER-TO-WATER SYSTEM DESIGN GUIDE 50YEW, 50PSW, & GSW W H AT E V E R I T TA K E S . WATER-TO-WATER SYSTEMS...

  • Page 2: Table Of Contents

    Revision Log...............Inside Back Cover Bryant works continually to improve its products. As a result, the design and specifi cations of each product at the time for order may be changed without notice and may not be as described herein. Please contact Bryant’s Customer Service Department at 1-405-745-2920 for specifi c information on the current design and spec i fi ca tions, and placing orders.

  • Page 3: Water-To-Water System Design Guide

    (50PSW and GSW series). Figure 1-2 shows the simple ductwork. If a boiler or heat pump is used to generate heat, but refrigerant circuit of the 50YEW series. With only four major the heat is delivered through a radiant fl oor system, the pumping...
  • Page 4 Water-to-Water System Design Guide Part I: System Overview Figure 1-2: 50YEW Series Refrigerant Circuit To/From To/From Heating Ground Source Load Distribution Loop System Brazed Plate HX Coaxial HX (Condenser) Compressor (Evaporator) Figure 1-3: Reversible Water-to-Water Heat Pump, Heating Mode Reversing...
  • Page 5 Bryant Geothermal Heat Pump Systems Part I: System Overview The 50YEW series compressors have a wide operating map, which WATER-TO-WATER HEAT PUMP DESIGN allows high temperature operation, up to 145°F [63°C] leaving water temperature, even at 32°F [0°C] ground loop temperatures.
  • Page 6 fl oor heating or domestic hot water will take priority). amount of Btu/hr [Watts] in a given area. The heat exchanger The 50YEW series includes internal controls, which makes system must have suffi cient surface area. installation much easier. Other Bryant water-to-water heat pumps must be controlled via external controls.
  • Page 7 Bryant Geothermal Heat Pump Systems Part I: System Overview SUMMARY Hydronic geothermal systems can be used very effectively in new installations, as well as in many retrofi t applications. Effi cient systems can be designed for residential, commercial and industrial applications.

  • Page 8: Part Ii: Load Side Design

    System Type [1,635 Watts], or 11%. Industry estimates are as high as 20%. Design Range Indoor Design However, Bryant encourages the use of load calculations at actual 100% Radiant Floor* 65-70°F [18-21°C] 65°F [18°C] temperature differences and infi ltration rates for equipment sizing, Mixed Radiant/Forced Air 68-72°F [20-22°C]...
  • Page 9 The complexity of the ground loop sizing can be simplifi ed with the use of software, like Bryant’s GeoDesigner. GeoDesigner allows the user to enter the heat loss/heat gain, the water-to-water unit size, and the ground loop parameters.
  • Page 10 I, is using existing fan coils for heating, especially CAUTION: if they were originally sized for high water temperatures. Maximum leaving water temperature of the 50YEW series For optimal cooling and dehumidifi cation, Bryant recommends a equipment is 145°F [63°C]. For domestic hot water tank temperatures or heating buffer tank temperatures above separate water-to-air heat pump for cooling.
  • Page 11 Bryant Geothermal Heat Pump Systems Part II: Load Side Design / Equipment Sizing Figure 2-2: Connections – Electric Water Heater / Buffer Tank Hot/Cold Water Connections Typical Buffer Tank Connection for Press Relief Valve Connection for Press Relief Valve Typical Electric Water Heater Load &...

  • Page 12: System Design & Selection

    System? Cooling System System? Chilled Radiant Floor Chilled Radiant Floor Use 50YEW (high temp) or Use 50PSW or GSW series High temp ( 50YEW ) unit is 50PSW/GSW ( med temp) Reversible Model not reversible. No Cooling or Separate series...
  • Page 13 Heater? See drawing 2-3 ( 50YEW Secondary Heat Exchanger / Pump 50PSW / GSW ) or drawing 2-4 ( is required. See drawing 2-2 (50YEW Buffer tank is required + HX + Pump + Water Heater) Domestic Indirect Buffer See drawing 2-1 (50YEW +...
  • Page 14 Part II: Load Side Design / System Design & Selection System Descriptions Drawing 2-1 – 50YEW Typical Load Piping Indirect Water Heater / No Cooling or Separate Cooling System: System #1 uses one Figure 2-4: Component Legend for Drawings 2-1 to or more water-to-water units and a buffer tank for each unit.
  • Page 15 50YEW load pump is energized temperature drops below the set point, typically 120°F [49°C] for potable water heating.
  • Page 16 Water-to-Water System Design Guide Part II: Load Side Design / System Design & Selection CAUTION: Maximum leaving water temperature of the 50YEW series equipment is 145°F [63°C]. For domestic hot water tank temperatures or heating buffer tank temperatures above 130°F [54°C], pump and pipe sizing is critical to insure that the fl...
  • Page 17 Part II: Load Side Design / System Design & Selection Figure 2-5: Example Secondary Heat Exchanger Sizing Drawing 2-3 – 50YEW Typical Load Piping / No DHW Heating or Separate DHW System / No Cooling or Separate Cooling System: System #3 uses one or more water-to-water units and a buffer tank for each unit.
  • Page 18 5. Buffer tank must be approved as a heating vessel. 6. Local code supercedes any piping arrangements or components shown on this drawing. Aqua-stat Load HX Source HX 03Oct07 (coaxial) (coaxial) Bryant: Whatever It Takes.
  • Page 19 A reversible unit is required for this application water tank temperature rises above the set point (typically 45- (50YEW is heating only – 50PSW/GSW units are reversible). 50°F [7-10°C]). The radiant fl oor (or baseboard, radiator, fan coil, Potable water is heated with a separate system.
  • Page 20 (additional relays are required for determining heating/cooling temperature drops below the set point (typically 120°F [49°C] logic). A reversible unit is required for this application (50YEW or less] in the heating mode, or when the tank temperature rises is heating only – 50PSW/GSW units are reversible). When using above the set point [typically 45-50°F [7-10°C]) in the cooling...
  • Page 21 1. Not all components shown (expansion tank, air vent, etc.). System Drawing is for buffer tank connections only. 2. Pump not needed for 50YEW unit with internal load pump option. Electric 3. Thermistor or aqua-stat should be installed in an immersion Water Heater well.
  • Page 22 1. Not all components shown (expansion tank, air vent, etc.). System Drawing is for buffer tank connections only. Note 3 2. Pump not needed for 50YEW unit with internal load pump option. Heating 3. Mixing valve and appropriate piping required on non-condensing Buffer Tank boilers (consult boiler manufacturer literature).
  • Page 23 Water Heater expansion tanks are installed, only an air vent is required. (optional backup 4. If optional 50YEW pump is used, this pump is not necessary. electric elements) 5. Other components (additional ball valves, unions, etc.) may be required for ease of service. This drawing shows only minimum requirements.

  • Page 24: Piping Design

    Table 2-1 gives specifi cations for 3/4” [19 mm] and 1” brittle. Solder type 95/5 1/8” [3.2 mm] diameter solder has [25 mm] copper piping. Bryant recommends only type “L” straight melting point of approximately 452-464°F [233-240°C], and is length copper tubing for connection between the water-to-water typically applied using a map gas torch (propane will work).
  • Page 25 Even if local code does not require this device, Bryant overheating of the tank. recommends its installation. If the pressure relief valve in the buffer...

  • Page 26: Source & Load Pump Sizing

    HYDRONIC HEATING / COOLING SOURCE & LOAD PUMP SIZING DISTRIBUTION DESIGN 50YEW series units are available with optional internal source and This section looks at the design parameters associated with each load pumps. See Part III for pump curves. The ground loop and of the delivery systems, particularly when retrofi...
  • Page 27 Some indirect water heaters have electric elements for use as must never come in contact with heating water. Therefore, an backup. The 50YEW series equipment has an emergency DHW indirect water heater or secondary heat exchanger is required. As function that will send a 24VAC signal to a fi eld-installed contactor shown in fi...

  • Page 28: Radiant Floor Heating

    Combining the advantages of radiant fl oor heating with the advantages of geothermal technology provides unmatched -12º -12º 35º comfort and savings. Plus, Bryant water-to-water units can share 16º the same ground loop with the water-to-air cooling system, or can 32º 16º...
  • Page 29 Btuh/ft. of radiation [W/m] at lower water temperatures. The with lower air temperatures if their feet are warm. Typically the 50YEW series can provide up to 145°F [63°C] for baseboard space will feel comfortable with air temperatures as low as 65°F radiation.
  • Page 30 fi n tubes tiered above one another in the same cabinet. The air can be heated enough with the additional surface area to set up a convection current with water temperatures as low as 110-130°F [43-54°C]. Bryant: Whatever It Takes.

  • Page 31: Fan Coils

    Bryant Geothermal Heat Pump Systems Part II: Load Side Design / Distribution Design Table 2-3: Typical Cast Iron Radiator Capacities Fan coils and air handlers typically have one or two coils and a blower. Air is heated by hot water circulated through a hot water coil.

  • Page 32: Snow Melt Applications

    The hot water in the piping system will heat the slab, melting the For optimal cooling and dehumidifi cation, Bryant recommends a snow. Snow melt controls are available that actually “sense” when separate water-to-air heat pump for cooling.

  • Page 33: Part Iii: Source Side Design

    Bryant Geothermal Heat Pump Systems Part III: Source Side Design / System Selection SYSTEM DESIGN System Selection Figures 3-1a and 3-1b present system selection in fl ow chart format for the source side of the water-to-water unit. There are fi ve piping schematics following the fl...
  • Page 34 Water-to-Water System Design Guide Part III: Source Side Design / System Selection Figure 3-1b: System Selection Flow Chart (Part 2) NOTE: Green arrows indicate Bryant recommended applications. Does each Are pumps Does unit have sized for both water-to-air its own...
  • Page 35 Pressure Reducing Valve Heat Exchanger Drawing 3-1: Water-to-Water Source Piping - To/From Ground Loop 50YEW (No Source Pumps) or 50PSW / GSW Units - No Cooling or Separate Cooling System Flow Controller See drawings in section 2 for Load connections...
  • Page 36 Part III: Source Side Design / System Selection Drawing 3-2 – Heating only application with internal source pump(s) – 50YEW only: Drawing 3-2 is used for 50YEW series units with optional internal source pump(s). Three-way valves are required for purging air from the system. It is important to note...
  • Page 37 The Bryant Flow Controller includes one or two circulator pumps, to the water-to-water unit is not warmer than the maximum plus 3-way valves for purging air from the system. The use of...
  • Page 38 3-way valves for purging air from the system. The use of disruption of cooling will be less noticeable than an interruption in a separate water-to-air unit for cooling is the Bryant preferred domestic hot water generation (domestic hot water priority). In application when cooling is required (drawings 3-3, 3-4, and 3-5).
  • Page 39 The use the maximum temperature shown in the performance catalog of a separate water-to-air unit for cooling is the Bryant preferred (50PSW/GSW units only). It is important to note that when application when cooling is required (drawings 3-3, 3-4, and 3-5).
  • Page 40 (open or closed loop) require extended range equipment is required. Desuperheater (HWG) coils can likewise equipment. Bryant residential series equipment is standard with become scaled and possibly plugged. In areas with extremely insulated water and refrigerant circuit insulation, designed for hard water, the owner should be informed that the heat low temperature operation.
  • Page 41 Bryant Geothermal Heat Pump Systems Part III: Source Side Design / Open Loop Design Table 3-1: Water Quality Standards Water Quality Closed Open Loop and Recirculating Well Parameter Material Recirculating Scaling Potential - Primary Measurement Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below.

  • Page 42: Open Loop Design

    * This note is for water-to-air units, which are horizontal or pond/lake loops, but their compact layout makes a rated for cooling capacities. 50YEW/50PSW series geothermal closed loop application possible for almost any home residential water-to-water units are rated for that has a small yard, driveway or sidewalk.
  • Page 43 Bryant Geothermal Heat Pump Systems Part III: Source Side Design / Closed Loop Design Horizontal (Trenched or Bored) Loop Horizontal loops may be installed with a trencher, backhoe or horizontal boring machine. Excavation costs are usually less than comparable vertical loops, but signifi cantly more land space is required.
  • Page 44 * All Polyethylene pipe discussed in this manual is IPS (Iron Pipe Smaller pipe takes less time to fuse and is easier to cut, bend, etc. Size) in inches. Bryant: Whatever It Takes.
  • Page 45 * This note is for water-to-air units, which assume the worst case, soil and moisture conditions at the job site in are rated for cooling capacities. 50YEW series the fi nal design. In other words, if part of the loop fi eld is saturated clay, residential water-to-water units are rated for and the remainder is damp clay, assume damp clay for design criteria.
  • Page 46 = 180 l/m or 3.0 l/s] to attain fl ush fl ow rate. This is clearly is a diffi cult fl ow to achieve with a pump of any size. Figure 3-4b: Typical Header Through 5 Tons Figure 3-5: Typical “Laydown” Header Bryant: Whatever It Takes.
  • Page 47 Bryant Geothermal Heat Pump Systems Part III: Source Side Design / Closed Loop Installation Guidelines Inside Piping - Polyethylene pipe provides an excellent no leak Loop pressure drop calculation should be performed for accurate piping material inside the building. Inside piping fi ttings and elbows fl...
  • Page 48 2 - UPS 26-80 (50Hz) - spd 3* 2 - UP 26-99 (60Hz)* 3 - UP 26-99 (60Hz)* 2 - UP 26-116 (60Hz)* *Pumps in series 50YEW010 (Optional) Internal Pumps Source Load 2 - UP26-99 1 - UP26-99 Bryant: Whatever It Takes.
  • Page 49 Bryant Geothermal Heat Pump Systems Part III: Source Side Design / Closed Loop Installation Guidelines Table 3-3a: Polyethylene Pressure Drop per 100ft of Pipe Antifreeze (30°F [-1°C] EWT): 20% Methanol by volume solution - freeze protected to 15°F [-9.4°F] 3/4” IPS SDR11 1”...
  • Page 50 4.14 3.82 10612 30.71 9.01 16711 14.77 6.62 14325 4.51 4.02 11168 16.02 6.93 14995 4.89 4.21 11696 17.31 7.25 15688 5.28 4.40 12223 18.65 7.57 16380 5.69 4.59 12751 20.04 7.88 17051 6.11 4.78 13279 Bryant: Whatever It Takes.
  • Page 51 Bryant Geothermal Heat Pump Systems Part III: Source Side Design / Closed Loop Installation Guidelines Table 3-3c: Polyethylene Pressure Drop per 100ft of Pipe Antifreeze (30°F [-1°C] EWT): 25% Ethanol by volume solution - freeze protected to 15°F [-9.4°F] 3/4” IPS SDR11 1”...
  • Page 52 0.00 0.00 0.00 19.94 9.87 194658 9.59 7.25 166817 2.93 4.40 129978 0.00 0.00 0.00 0.00 0.00 0.00 10.33 7.57 174180 3.15 4.59 135591 0.00 0.00 0.00 0.00 0.00 0.00 11.09 7.88 181313 3.39 4.78 141203 Bryant: Whatever It Takes.
  • Page 53 Bryant Geothermal Heat Pump Systems Part III: Source Side Design / Closed Loop Installation Guidelines Table 3-3e: 1” Rubber Hose Pressure Drop per 100ft of Hose Methanol* Propylene Glycol* Ethanol* Water* Flow Rate PD (ft) Vel (ft/s) PD (ft) Vel (ft/s)
  • Page 54 Space boreholes a minimum of 10 feet [3 meters] apart. In southern or cooling dominated climates 15 feet [4.6 meters] is required. Commercial installations may require more distance between bores. This manual is not intended for commercial loop design. Bryant: Whatever It Takes.
  • Page 55 Bryant Geothermal Heat Pump Systems Part III: Source Side Design / Closed Loop Installation Guidelines Pond/Lake Applications Figure 3-8: Typical Pond/Lake Loop Confi gurations Pond loops are one of the most cost effective applications of geothermal systems. Typically 1 coil of 300 ft of PE pipe per cooling ton [26 meters per kW -- one 92 meter coil per 3.5 kW of cooling...

  • Page 56: Closed Loop Design

    Insulation Inside Protective Shield Loop Pipe Figure 3-11: Retrofi t Construction Detail Figure 3-13: Below Grade Entry Detail Enter Building As Soon As Possible Insulation Inside Protective Shield Finished Grade 4-6' [1.2 - 1.8m] Loop Pipe Bryant: Whatever It Takes.

  • Page 57: Part Iv: Controls

    The next several pages show the various control drawings, as well as specifi c information on the internal controls available in the 50YEW series heat pumps. No one strategy is best for all hydronics applications. Individual customer preferences and budgets will help determine which system is best for each application.
  • Page 58 DHW valve (optional): An internal three-way valve is available, special installer set up mode allows the technician to change some which allows the 50YEW unit to switch between heating and of the default MPC parameters. The user interface includes a DHW generation.
  • Page 59 Bryant Geothermal Heat Pump Systems Part IV: Controls then be reduced by the outdoor temperature reset function, Figure 4-3 shows an example outdoor temperature reset curve for depending on the current outdoor air temperature (OAT) value. a climate that has an outdoor design temperature of -4°F [-20°C].
  • Page 60 (e.g. radiant fl oor) thermostat. Heat pump staging: For large capacity installations, multiple 50YEW units may be controlled by the fi rst heat pump via the backup boiler function. The second unit simply needs a 24VAC relay that is energized by the output of the fi...
  • Page 61 External 50YEW Series 50PSW/GSW Series Wiring diagrams for the 50YEW series are shown below. A The 50PSW and GSW series water-to-water heat pumps require 12-point terminal strip (shaded in gray) provides connections for external controls for hydronic heating. If outdoor temperature thermistors and other external devices used for controlling the reset is not required, a simple aqua-stat can control the heat pump.

  • Page 62: Wiring Diagrams

    LWTS Legend : Radiant Floor 24VAC interrupt* Common *These connections allow the 50YEW unit to manage seasonal change- Electric Heat (DHW)** over by enabling or disabling the radiant floor or other hydronic 2nd Stage Heat*** heating system with the use of the warm weather shut down 24VAC to cooling thermostat feature, which is part of the 50YEW series controls.
  • Page 63 Bryant Geothermal Heat Pump Systems Part IV: Controls / Wiring Diagrams Drawing 4-2: 50YEW Unit - Direct Water Heater & 50YEW Unit Drawing 4-2: THW Unit with Direct Secondary Heat Exchanger* Water Heater and Secondary Heat Exchanger* Secondary Pump Water Heater...
  • Page 64 The coil should be wired Legend : between terminals “A” and “C.” Pumps must fuse-protected. Radiant Floor 24VAC interrupt** **These connections allow the 50YEW unit to manage seasonal change- Common over by enabling or disabling the radiant floor or other hydronic Electric Heat (DHW)***...
  • Page 65 Bryant Geothermal Heat Pump Systems Part IV: Controls / Wiring Diagrams Drawing 4-4: 50YEW Unit - Internal Pumps* / From Radiant Heat Water-to-Air Unit for Cooling / Indirect Drawing 4-4: THW Unit / Internal Transformer (Secondary Side) DHW Tank To Radiant Heat...
  • Page 66 Water-to-Water System Design Guide Part IV: Controls / Wiring Diagrams Drawing 4-5: 50YEW Unit - External Pumps* / From Radiant Heat Water-to-Air Unit for Cooling / Indirect Drawing 4-5: THW Unit / External Transformer (Secondary Side) DHW Tank To Radiant Heat...
  • Page 67 Bryant Geothermal Heat Pump Systems Part IV: Controls / Wiring Diagrams Drawing 4-6: 50PSW or GSW Unit - External Pumps* / No Cooling Buffer Tank Aqua-Stat Water-to-Water Unit *Wiring assumes that source pumps and load pumps will be energized when compressor is energized.
  • Page 68 NOTE: An electrically operated solenoid valve must be installed at each unit to only allow 14Sep07 water flow through the unit that is operating. 2) Load pump should be energized when source pump is energized. Bryant: Whatever It Takes.
  • Page 69 Bryant Geothermal Heat Pump Systems Part IV: Controls / Wiring Diagrams Drawing 4-9: 50PSW or GSW Unit - External Pumps* / Cooling with Chilled Water (Fan Coils) Buffer Tank Hot Water Aqua-Stat Field installed relay and wiring Buffer Tank Chilled Water...
  • Page 70 Water-to-Water System Design Guide Bryant: Whatever It Takes.

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