Temperature modulated with electronic ignition suitable for heating potable water and space heating (intended for variable flow applications) (60 pages)
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Installation and Operating Instructions INDOOR MODEL 940 ES 940 ES - Natural Gas / 940 ES - Liquefied Petroleum (LP) Gas WARNING! Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional infor- mation consult a qualified installer, service agency or the gas supplier.
Massachusetts, the water heater a reference to a related part in the document must be installed by a licensed • a list entry plumber. – a list entry (second level) Table 1 940 ES – 6 720 644 930 (2019/09)
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H DANGER: building. ▶ From outside the building, call the gas Danger of explosion of flammable utility company and a trained and gases. certified installer. 940 ES – 6 720 644 930 (2019/09)
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H CAUTION: circumstances. Children must not be Instruct the customer. allowed to operate hot water faucets ▶ Explain to the customer how the themselves. appliance works and how to operate 940 ES – 6 720 644 930 (2019/09)
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To protect against corrosion and ensure compliance with the rules for electrical safety, observe the following points: ▶ Use metal fittings for potable water heating systems with plastic piping. ▶ Use only original accessories from the manufacturer. 940 ES – 6 720 644 930 (2019/09)
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Damage to the appliance from over pressure. ▶ The heater must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures equal to or more than 0.5 psi. 940 ES – 6 720 644 930 (2019/09)
• Recess box kit (7736500043) • Pressure relief valve (7 738 001 152) BOSCH water heater complies with the State of California Lead • Isolation Valve Kit (7738003449) Law (AB1953). Appliance details BOSCH is constantly improving its products, therefore specifications are subject to change without prior notice.
• Energy Guide label (in the front cover) Please complete and return the enclosed product registration card. The 940 ES is not approved or designed for: • Manufactured (mobile) homes, boats or any mobile installation. (Modular homes are acceptable for installation).
The National Fuel Gas Codes do not allow UNSEALED gas fired water heater installations in bathrooms, bedrooms or any occupied rooms normally kept closed. See chapter 4.4 (page 33). 940 ES – 6 720 644 930 (2019/09)
Dimensions and minimum installation clearances Fig. 6 Dimensions [1] On/Off button [2] Reset button [3] Program key [4] Power ON or stand-by LED [5] LCD display [6] Up button [7] Down button 940 ES – 6 720 644 930 (2019/09)
WARNING: Specialized tools ▶ Do not mix vent pipe or joining methods from different The following specialized tools may be required for installation: manufacturers. • Manometer • Multi-meter • Combustion Gas Analyzer 940 ES – 6 720 644 930 (2019/09)
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In all cases, follow local codes. See table 5: Item Diam. Material Exhaust Vent 3 or 4 inches Sealed single wall stainless steel (AL29-4C) Intake Vent Sealed PVC or any other rigid pipe Table 5 Venting Specifications 940 ES – 6 720 644 930 (2019/09)
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Heat-Fab www.heatfab.com appliance. This will create a serious health hazard and void the 800-772-0739 warranty. Table 8 Vent manufacturers 940 ES – 6 720 644 930 (2019/09)
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= 23,5’ 45° elbow reduction - 1,25’ Max. number of 90° elbows 3" venting 4" venting Total = 22,25’ Table 14 Max number of elbows Table 10 940 ES – 6 720 644 930 (2019/09)
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61,25’ 90° elbow reduction - 1,25’ sub-total = 60’ 45° elbow reduction - 1,5’ Total = 58,5’ Table 18 For this example, the maximum allowable combustion air pipe length is 58,5 feet. 940 ES – 6 720 644 930 (2019/09)
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Clearance to non-mechanical air supply inlet to building or the 36 in. 12 in. combustion air inlet to any other application Clearance to mechanical air supply inlet 72 in. 36 in. above if within 10 feet horizontally 940 ES – 6 720 644 930 (2019/09)
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A minimum clearance value determined by testing in accordance with section 2.20, or; b) A reference to the following footnote: “Clearance in accordance with local installation codes and the requirements of the gas supplier.” 940 ES – 6 720 644 930 (2019/09)
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Clearance to inside corner Clearance to each side of center line extended above meter/ 36 in. within a height 15 regulator assembly feet above meter/ regulator assembly Clearance to service regulator vent outlet 36 in. 940 ES – 6 720 644 930 (2019/09)
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A minimum clearance value determined by testing in accordance with section 2.20, or; b) A reference to the following footnote: “Clearance in accordance with local installation codes and the requirements of the gas supplier.” 940 ES – 6 720 644 930 (2019/09)
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[5] Elbow (note: minimum 1ft of straight vent pipe required) [6] Horizontal run ¼" per foot down to termination WARNING: [7] Hanger strap ▶ Single pipe penetration should be used in non-freezing climates only! 940 ES – 6 720 644 930 (2019/09)
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WARNING: Below are approved examples of vertical venting installations. ▶ Single pipe penetration should be used in non-freezing Important: climates only! Note: Pitch horizontal runs down toward the heater, ¼" per foot. 940 ES – 6 720 644 930 (2019/09)
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[3] Elbow [4] Hose clamp [5] Hanger strap [6] Horizontal run ¼" rise/ft [7] May be insulated if necessary [8] Chimney [9] Rain cap [10] Storm collar [11] Flashing [12] Silicone seal 940 ES – 6 720 644 930 (2019/09)
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ASTM D1785, F441 orD2665. Cement and primer must comply with ASTM D2564 or F493. For Canada, use CSA or ULC certified PVC or CPVC pipe, fittings and cement, see fig. 5. 940 ES – 6 720 644 930 (2019/09)
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[7] Flashing Solution Two [8] 4" minimum air space If the required clearances of the Zflex termination hood cannot [9] Condensate drain Tee be met, the Zflex damper is the preferred alternative (see 940 ES – 6 720 644 930 (2019/09)
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• Do not install damper in unconditioned spaces (e.g. attics) Condensation can build up while the heater is running which can later freeze and potentially block the flapper 940 ES – 6 720 644 930 (2019/09)
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31 on how to adjust the fan speeds if an adjustment is table 22: necessary. After changing fan speed values, proceed to chapter 7.4 to confirm CO values are within specified ranges. 940 ES – 6 720 644 930 (2019/09)
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1) Full equivalent length (inlet + outlet piping + fittings) Table 24 Fan speed adjustment for 4" piping Adjusting minimum power fan speed (P2) To select fan speed: ▶ Push power button to shut the water heater off. 940 ES – 6 720 644 930 (2019/09)
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248 CMR 5.08(2)(a)1 through 4.(b) 940 ES – 6 720 644 930 (2019/09)
This failure is not falling into the unit. covered under the manufacturer's warranty. If a single pipe installation is utilized, follow guidelines below for providing adequate combustion air for the water heater as well 940 ES – 6 720 644 930 (2019/09)
See fig. 6, page 14. – 3000 BTU/hr (878.43 Watts) if all air is taken from the outside by a direct opening or vertical duct. 940 ES – 6 720 644 930 (2019/09)
The heater must be kept level on the wall surface, see fig. 28, page 36. ▶ Hang the appliance on the bracket, see fig. 29, page 37. 6720608158-64.1AL Fig. 28 Leveling wall mounting bracket 940 ES – 6 720 644 930 (2019/09)
Explosion hazard! bottom of the unit as shown in fig. 27. ▶ DO NOT connect to an unregulated or high pressure propane line or to a high pressure commercial natural gas line. 940 ES – 6 720 644 930 (2019/09)
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Once connections are made, check for gas leaks at all joints. Apply some gas leak detection solution to all gas fittings. Bubbles are a sign of a leak. A combustible gas detector may also be used to detect for leaks. 940 ES – 6 720 644 930 (2019/09)
For your convenience see below for an excerpt from gas line sizing tables for a single NG appliance. For details see the current NFPA Specified pipe lengths are for one 940 ES, which has a maximum input rating of 199,000 BTUs. The gas supply system must be sized for the combined total maximum BTU/hr load requirements of all gas appliances running simultaneously.
2nd stage (low pressure) regulator and the appliance. For details see the current NFPA 54 or NFPA 58. Specified pipe lengths are for one 940 ES which has a maximum input of 199,000. The gas supply system must be sized for the combined total maximum BTU/hr load requirements of all gas appliances running simultaneously.
For water analysis data call your local water department, or if on a well, have well water analyzed periodically. If water quality exceeds one or more of the values specified below, Bosch 940 ES – 6 720 644 930 (2019/09)
Copper mg/l or ppm recirculation design using the water heater in conjunction with a Bosch electric mini tank water heater. This schematic is for Iron mg/l or ppm illustration only and must not be used for actual Installation...
(closed-loop setup). Bosch supports applications of combination DHW and space heating in an open loop configuration if plumbed similar to FIG. 37. Use of a Bosch tankless water heater in a combination DHW and space heating 940 ES – 6 720 644 930 (2019/09)
LPG will result in insufficient degree rise to the hot water being used, reduced hot water volume, possible error code faults and must be corrected. See Gas Connections, chapter 4.9, page 36. 940 ES – 6 720 644 930 (2019/09)
Note: The outlet the appliance is plugged into should be clear from possible water damage. Position of the fuses in control unit To check fuses, proceed as follows: ▶ Remove the front cover, see fig. 4, page 12. 940 ES – 6 720 644 930 (2019/09)
Low flowing fixtures are the leading cause of this type of temperature overshoot. To combat this symptom, clean fixtures or replace with higher flowing ones if necessary. 940 ES – 6 720 644 930 (2019/09)
▶ Hold “Program” button for 3 seconds to save temperature. When LCD stops blinking, temperature is saved in memory. Using “Program” function In order to select memorized temperature ▶ Press “Program” key. 940 ES – 6 720 644 930 (2019/09)
Observe burner flames minutes, a crossover of the hot and cold water pipes is during heater operation. Flames should be steady and blue present and must be corrected before proceeding. 940 ES – 6 720 644 930 (2019/09)
▶ Run solution through the heater until the solution returning to the descaling reservoir comes out clear. (Changing to a fresh solution may be necessary during this process). 940 ES – 6 720 644 930 (2019/09)
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▶ Press the ‘+’ button until P2 appears. Unit will ramp down to made in small increments. It may take several minutes for low fire and the water flow should decrease. readings to stabilize. ▶ Record the CO reading in P2 below. 940 ES – 6 720 644 930 (2019/09)
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4. Press ON/OFF button to turn OFF the heater and then turn ON the heater. 5. Heater is ready for normal operation. Fig. 61 Adjusting P1 CO level 6720608158-38.1AL Fig. 62 Adjusting P2 CO level 940 ES – 6 720 644 930 (2019/09)
“P” - button Cascading type This menu is only available when cascade mode is selected CC. Contact Bosch Water Heating for details. Primary/Secondary mode Table 37 Program values, factory default settings and ranges. 940 ES – 6 720 644 930 (2019/09)
Visit our web site at www.bosch- See chapter 13.2, page 69 for location of these parts. climate.us for more detailed troubleshooting. For best results, 9.
2. Improper venting. Venting that is unsealed, the wrong material, too big in diameter or too long in run will result in unstable burner flames and noise. Ensure venting is in accordance with specifications in chapter 4.3, page 15. 940 ES – 6 720 644 930 (2019/09)
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6. Verify proper CO readings per chapter 7.4, page 52. CO adjustments must be done by a certified gas technician with a calibrated combustion gas analyzer. 940 ES – 6 720 644 930 (2019/09)
2. Check supply voltage. It must be 120VAC and properly grounded. (Status message, not an error). 3. Possible defective control unit call Bosch Water Heating for further instructions. Primary fan rotation too low in 1. Disconnect power supply cord and check wire connection on back side of fan operation.
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74, page 74. 2. Check supply voltage. It must be 120VAC and properly grounded. 3. Possible defective component in fan or defective control unit call Bosch Water Heating for further instructions.
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GPM. Measure voltage at the gas valve wire plug connection. The voltage should measure 24VDC between the left pair of wires and 24VDC between the right pair of wires when the unit is operating. If voltage is not proper, contact Bosch Water Heating for further instruction.
[17] Water valve with engine and temperature sensor [7] On/Off button [18] Control unit [8] Reset button [19] Up button [9] Program key [20] Down button [10] Flue gas limiter [21] LED [11] Heat exchanger overheat sensor 940 ES – 6 720 644 930 (2019/09)
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Interior components diagram and parts list Fig. 68 Appliance overview 940 ES – 6 720 644 930 (2019/09)
1) See Chapter 4.14, page 45 and gas pressure table (to be filled out by installer) Table 48 Installation manual should be left with the owner after the installation is tested and completed. 940 ES – 6 720 644 930 (2019/09)
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50 Wentworth Avenue Londonderry, NH 03053 Tel. 603-552-1100 Fax 603-965-7581 www.boschheatingandcooling.com U.S.A. Products manufactured by Bosch Thermotechnik GmbH Junkersstrasse 20-24 D-73249 Wernau www.bosch-thermotechnology.com Bosch Thermotechnology Corp. reserves the right to make changes without notice due to continuing engineering and technological advances.