WARNING: Follow each appliance's instructions precisely. Installation and service must be performed by a trained and certified installer, service agency or the gas supplier. Application drawings in this manual are conceptual only and do not purport to address all design, installation, code, or safety considerations. The diagrams in this manual are for reference use by code officials, designers and licensed installers.
| Greentherm T9800/9900 SE/SEO/SEi Data subject to change Application Manual 12.2019 | Bosch Thermotechnology Corp.
Application Manual Greentherm T9800/9900 SE/SEO/SEi | 3 Table of Contents 1 Key to Symbols and Safety Instructions 4 1.1 Key to Symbols 4 1.2 Safety 4 2 Introduction 5 3 Water Heater Sizing 6 3.1 Sizing Tankless Water Heaters 6 4 8 Applications 4.1 Single Installation 8 4.2 Domestic Hot Water Recirculation 9 4.2.1 Recirculation system types 9 4.2.2 Recirculation with the Greentherm T9900 models 11 4.2.3 Recirculation with the Greentherm T9800 models 12 4.3 Tank Loading 13 4.
| Greentherm T9800/9900 SE/SEO/SEi Application Manual 1 Key to Symbols and Safety Instructions 1.2 Safety 1.1 Key to Symbols Please read safety precautions before installation Warnings WARNING: READ INSTRUCTIONS Warnings in this document are identified by a warning triangle printed against a grey background. Keywords at the start of a warning indicate the type and seriousness of the ensuing risk if measures to prevent the risk are not taken.
Application Manual Greentherm T9800/9900 SE/SEO/SEi | 5 2 Introduction This Applications Manual is intended to present some of the most common applications of the Bosch Greentherm tankless water heaters. Application drawings are shown with both piping and corresponding electrical schematics where applicable. Auxiliary equipment depicted does not necessarily represent a specific manufacturer or model number.
| Greentherm T9800/9900 SE/SEO/SEi Application Manual 3 Water Heater Sizing This section describes guidelines on how to select the right tankless water heater size for a particular application. More detailed information is contained in the installation manuals. Download manuals at www.boschheatingandcooling.com. ME WA MT VT ND MN OR WY PA IA NE 3.
Application Manual Model Inlet temperature (°F) Power 9800/9900 SE/ SEO/SEi 9800/9900 SE/ SEO/SEi Table 1 Greentherm T9800/9900 SE/SEO/SEi | 7 77° 72° 67° 62° 57° 52° 47° 42° 37° 14.2 GPM 12.1 GPM 10.5 GPM 9.3 GPM 8.3GPM 7.5 GPM 6.9 GPM 6.3 GPM 5.9 GPM 11.4 GPM 9.6 GPM 8.4 GPM 7.4 GPM 6.6 GPM 6.0 GPM 5.5 GPM 5.0 GPM 4.7 GPM 199 kBTU/hr 160 kBTU/hr Maximum hot water flow for multiple inlet water temperatures.
| Greentherm T9800/9900 SE/SEO/SEi Application Manual 4 Applications 4.1 Single Installation Domestic Hot Water Domestic Cold Water Gas NBT-23 Condensate Neutralizer 1) (part# 7 738 005 514) To drain or pump Legend Full-port ball valve Potable expansion tank 1) Union Pressure relief valve Drip leg / Sediment trap Figure 2 1) as required by local code. DISCLAIMER: This drawing is conceptual in nature, not to scale and for reference only.
Application Manual Greentherm T9800/9900 SE/SEO/SEi | 9 4.2 Domestic Hot Water Recirculation 4.2.1 Recirculation system types Hot water recirculation is a technology that provides hot water virtually instantly at the point of use by circulating hot water through the home’s domestic hot water pipes. There are two basic types of recirculation systems. The benefits of hot water recirculation are the reduction in the amount of water wasted and wait time for hot water to arrive at the point of use.
1 0 | Greentherm T9800/9900 SE/SEO/SEi Application Manual 4.2.1.2 Recirculation system using a cross-over valve Homes built without a dedicated return line can have a cross-over valve installed under the sink located farthest from the water heater allowing for recirculation as shown in Figure 4. Cross-over valves are not allowed in some states and localities. Verify with your local codes if cross-over valves are allowed.
Application Manual Greentherm T9800/9900 SE/SEO/SEi | 11 4.2.2 Recirculation with the Greentherm T9900 models The T9900 models have an integrated pump which removes the need to use an external pump, and simplifies the installation. It is recommended that the recirculation system is designed to allow a recirculation flow rate grater than 1GPM. Refer to figure 5 and figure 6 for the hydraulic curve of the T9900 models integrated pump and the tankless pressure drop curve to proper system dimensioning.
1 2 | Greentherm T9800/9900 SE/SEO/SEi Application Manual 4.2.3 Recirculation with the Greentherm T9800 models Recirculation with the T9800 models requires the installation of an external pump. The T9800 models have the capability of controlling an externally powered pump by switching power ON and OFF using the accessory pump cable kit 7736504585. See figure 7. Use only bronze or stainless steel pumps. Do not use pumps of iron construction as they will oxidize and pose health risks.
Application Manual Greentherm T9800/9900 SE/SEO/SEi | 13 4.3 Tank Loading Tank loading pairs tankless water heaters with storage tanks to maximize peak flow for high demand applications. A tank load system, because of the added storage, can provide a high peak flow with fewer tankless units and lower installed cost. Tank loading is recommend for high cycle applications such as commercial kitchens with hand sprayers.
1 4 | Greentherm T9800/9900 SE/SEO/SEi Application Manual 4.3.1 Single tank loading installation Hot Water Supply Local code requirements may require installation of a thermostatic mixing valve in some installations. see wiring detail Section 4.
Application Manual Greentherm T9800/9900 SE/SEO/SEi | 15 4.3.2 Single tank loading with recirculation installation Hot Water Supply Local code requirements may require installation of a thermostatic mixing valve in some installations. see wiring detail Section 4.
1 6 | Greentherm T9800/9900 SE/SEO/SEi Application Manual 4.3.3 Multiple tank loading installation NOTE: 110 VAC pump relay and tank aquastat field supplied Hot Water Supply Pump Relay Local code requirements may require installation of a thermostatic mixing valve in some installations.
Application Manual Greentherm T9800/9900 SE/SEO/SEi | 17 4.3.4 Multiple T9800 tank loading with recirculation installation NOTE: 110 VAC pump relay and tank aquastat field supplied Hot Water Supply Pump Relay Local code requirements may require installation of a thermostatic mixing valve in some installations.
1 8 | Greentherm T9800/9900 SE/SEO/SEi Application Manual 4.4 Combined Domestic Hot Water and Space Heating with Air Handler Combined domestic hot water and space heating using air handler is possible with the Greentherm 9000 models. Local code requirements may require installation of a thermostatic mixing valve in some installations.
Application Manual Greentherm T9800/9900 SE/SEO/SEi | 19 4.5 Multi-Unit Cascading Cascading up to 24 appliances is possible with the Greentherm 9000 models, using the accessory Intelligent Cascading Kit 7709003962.
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