Download  Print this page

Bosch 940 ESO Manual

940 eso - natural gas / 940 eso - liquefied petroleum (lp) gas
Hide thumbs

Advertisement

FOR OUTDOOR INSTALLATIONS ONLY
940 ESO
940 ESO - Natural Gas / 940 ESO - Liquefied Petroleum (LP) Gas
Temperature Modulated with Electronic Ignition Suitable for heating potable water and space heating
(Intended for variable flow applications)
Warning: If the information in this manual is not followed exactly, a fire
or explosion may result causing property damage, personal injury or
death.
Do not store or use gasoline or other flammable vapors and liquids in the
vicinity of this or any other appliance.
Installation and service must be performed by a trained and certified
installer, service agency or the gas supplier.
Improper installation, adjustment, alteration, service or maintenance
can cause injury or property damage. Refer to this manual. For assis-
tance or additional information consult a qualified installer, service
agency or the gas supplier.
In the Commonwealth of Massachusetts this product must be installed
by a licensed plumber or gas fitter.
Upon completion of the installation, these instructions should be
handed to the user of the appliance for future reference.
What to do if you smell gas
• Turn off the gas shut-off valve. Open windows and doors.
• Do not try to light any appliance.
• Do not touch any electrical switch, telephone, and do not use out-
lets.
• Extinguish all open flames. Do not smoke! Do not use lighters!
• Warn all occupants of the building. Do not ring doorbells!
• If you can hear gas leaking, leave the building immediately. Prevent
others from entering the building and notify the police and fire
department from outside the building.
From outside the building, call the gas utility company and a trained
and certified installer.

Advertisement

loading

  Related Manuals for Bosch 940 ESO

  Summary of Contents for Bosch 940 ESO

  • Page 1 FOR OUTDOOR INSTALLATIONS ONLY 940 ESO 940 ESO - Natural Gas / 940 ESO - Liquefied Petroleum (LP) Gas Temperature Modulated with Electronic Ignition Suitable for heating potable water and space heating (Intended for variable flow applications)
  • Page 2: Table Of Contents

    Operation ........27 6 720 644 956 (2016/05) 940 ESO...
  • Page 3: Key To Symbols And Safety Instructions

    ▶ Immediately correct all faults to prevent system damage. ▶ In the Commonwealth of Massachusetts, the water heater must be ▶ Use only Bosch spare parts! Damage caused by the use of parts not installed by a licensed plumber. supplied by Bosch may void the warranty.
  • Page 4 ▶ After a flood, do not use the appliance if any part has been submerged. Damage to appliances that have been submerged can be quite severe and pose numerous safety risks. ▶ Every appliance that has been submerged must be replaced. 6 720 644 956 (2016/05) 940 ESO...
  • Page 5 The pan must not restrict combustion air potable water. flow. WARNING: Personal Injury from toxic chemicals. ▶ Toxic chemicals, such as those used for boiler treatment, shall not be introduced into the potable water used for space heating. 940 ESO 6 720 644 956 (2016/05)
  • Page 6: Fcc Rules

    The chart below shows the relationship between water temperature and time until there is a risk of scalding. It can be used as the basis for determining the safest water temperature for your application. 6 720 644 956 (2016/05) 940 ESO...
  • Page 7: Appliance Details

    • Horizontal vent kit (4TWHVK3SII) Cold water connection inches ¾ " Minimum water flow GPM (l/min) 0.5 (1.9) BOSCH is constantly improving its products, therefore specifications are subject to change without prior Minimum recommended PSI (bar) 30 (2.07) notice. water pressure...
  • Page 8: Unpacking The Heater

    • Product registration card Voltage Please complete and return the enclosed product registration card. Nominal V AC The 940 ESO is not approved or designed for: Frequency • Manufactured (mobile) homes, boats or any mobile installation. (Modular homes are acceptable for installation). Amperage •...
  • Page 9: General Rules To Follow For Safe Operation

    • 1. You must follow these instructions when you install your heater. In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54. 940 ESO 6 720 644 956 (2016/05)
  • Page 10: Dimensions And Minimum Installation Clearances

    10 | Appliance details Dimensions and minimum installation clearances Fig. 6 Dimensions On/Off button Reset button Program key Power ON or stand-by LED LCD display Up button Down button 6 720 644 956 (2016/05) 940 ESO...
  • Page 11: Installation Requirements

    DANGER: explosion or carbon monoxide poisoning could ▶ Do not place or store any combustible material within result. Bosch Thermotechnology Corp. is not 5 feet of the appliance. Maintain specified clearance responsible for improperly installed appliances. to combustibles on the wall where the appliance is installed and any adjacent walls or overhang.
  • Page 12: Installing Outdoor Vent Cap On The Appliance

    1. Attach the supports (A) to the appliance by fastening with the four provided screws, as shown in fig. 8. 6720645551-11.1V Fig. 10 Outdoor cap 6720644956-03.1V Fig. 8 Support brackets Before mounting the outdoor kit in the appliance: 6720645551-12.1V Fig. 11 Screws 6 720 644 956 (2016/05) 940 ESO...
  • Page 13 Installation using Outdoor Kit (BTOK) | 13 NOTE: Once this kit is installed, the outdoor vent cap will need to be removed before removing the front cover. Fig. 12 Dimensions of 940 ESO with Outdoor kit (BTOK) 940 ESO 6 720 644 956 (2016/05)
  • Page 14: Selecting Heater Location

    ▶ The water heater is approved for installation directly on an outside Wood wall. Secure the wall mounting bracket provided with the water siding heater to a wall surface. See fig. 14. Fig. 15 Installation on vinyl 6 720 644 956 (2016/05) 940 ESO...
  • Page 15: Installation Using The Recess Box (7 736 500 043)

    ▶ Secure the wall mounting bracket provided with the heater to the wall configuration. Damages resulting from an improper surface. The heater must be kept level on the wall surface, see fig. installation will not be covered by Bosch limited 25, page 20. warranty.
  • Page 16 5.2. 6720644956-08.1V Fig. 22 Close the recess box cover with Padlock 6720644956-05.1V WARNING: Fig. 20 Leveling the mounting bracket and screwing the recess box on ▶ Appliance must be installed vertically! the studs 6 720 644 956 (2016/05) 940 ESO...
  • Page 17: Installation For Manufactured (Mobile) Homes

    See chapter 8.6, page 23 for the procedure to natural gas line. measure gas pressure. Proper gas pressure must be confirmed at time of installation. 940 ESO 6 720 644 956 (2016/05)
  • Page 18 For your convenience see below for an excerpt from gas line sizing tables for a single NG appliance. For details see the current NFPA 54. Specified pipe lengths are for one 940 ESO, 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.
  • Page 19: Water Connections

    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 ESO 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.
  • Page 20: Water Quality

    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 recommends consulting a local water treatment professional for water softening/conditioning options.
  • Page 21: Space Heating Applications

    ▶ Ensure the primary pump is properly sized to provide the water heater in conjunction with a Bosch electric mini tank water adequate flow for the system heat load. Ensure the heater.
  • Page 22 22 | Installation instructions 940ESO 6720644956-15.1V Flow (GPM) Fig. 29 Pressure drop curve 6 720 644 956 (2016/05) 940 ESO...
  • Page 23: Measuring Gas Pressure

    If heater display reverts to P2, open more hot water fixtures to ▶ Record static gas pressure reading in table 13. allow sufficient flow. Press until P1 reappears on the display. ▶ Record lowest operating gas pressure reading in table 13. 940 ESO 6 720 644 956 (2016/05)
  • Page 24: Electrical Connections

    60Hz properly rated receptacle and must be properly grounded. ▶ After checking the fuses, reinstall all parts in reverse order. The heater is wired as shown in the wiring diagram (chapter 14, Fig.60). 6 720 644 956 (2016/05) 940 ESO...
  • Page 25: Operation Instructions

    Fig. 41 Flame indicator Fig. 37 Power bar indicator (input) Fig. 42 Solar mode indicator (see chapter 10.4, page 26) Fig. 38 Temperature indicator Fig. 43 Remote control indicator Fig. 39 Error indicator 940 ESO 6 720 644 956 (2016/05)
  • Page 26: For Your Safety Read Before Operating Your Water Heater

    ▶ To shut down the appliance press the On/Off button again. exceed 140°F (60ºC), a thermostatic or mixing valve must be installed before the appliance to prevent water exceeding 140°F (60°C) from entering the appliance. 6 720 644 956 (2016/05) 940 ESO...
  • Page 27: Use Of Optional Remote Control Accessory

    After changing fan speed Failure to make necessary adjustments to fan speed values may result in values, proceed to section11.4 to confirm CO2 values are within improper operation of the appliance. specified ranges. 940 ESO 6 720 644 956 (2016/05)
  • Page 28 (1/2) inch in size, "GAS licensed professionals for the installation of hard wired carbon VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS". 6 720 644 956 (2016/05) 940 ESO...
  • Page 29: Program Button

    Refer to Section 5, page 11 of this manual to verify selected temperature. exhaust system and combustion air supply meets manufacturer's 10.10 Locked condition specifications. This condition is only valid for appliances with one or more remote controls installed. 940 ESO 6 720 644 956 (2016/05)
  • Page 30: Winterizing For Seasonal Use

    • Inspect heat exchanger fin coils for soot build-up or blockage. To Properly discard of solution. access fincoil, consult service bulletin at www.bosch-climate.us. If ▶ Position a container below the hot water outlet and connect cold there is evidence of soot build-up or blockage, the heat exchanger water supply.
  • Page 31 ▶ Press the ‘+’ button until P2 appears. Unit will ramp down to low fire and the water flow should decrease. ▶ Record the CO reading in P2 below. P1 CO Reading: % CO P2 CO Reading: % CO 940 ESO 6 720 644 956 (2016/05)
  • Page 32: Program Values

    “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 18 Program values, factory default settings and ranges. 6 720 644 956 (2016/05)
  • Page 33: Control Board Diagnostics

    9th most recent error 10th most recent error Appliance type - Cd (Condensing) Appliance type - nC (Non condensing) Appliance power - 175 / 199 (kBTU/hr) Table 19 * Settings define from factory 940 ESO 6 720 644 956 (2016/05)
  • Page 34: Troubleshooting

    6. In areas where the water has a high mineral content, periodic be answered by following the troubleshooting steps as outlined below. descaling may necessary. See chapter11.3, page 30 for directions. Visit our web site at www.bosch-climate.us for more detailed 12.4 Water is not hot enough troubleshooting.
  • Page 35: Hot Water Temperature Fluctuates At Tap

    If this slows the flow through the tankless water heater below its activation point, it will shut off the burners. The end result is nothing but cold water coming out of the outlet. Consult www.bosch- climate.us for a detailed service bulletin on overcoming temperature fluctuations.
  • Page 36: Problem Solving

    (Status message, not an error). 2. Check supply voltage. It must be 120VAC and properly grounded. 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 and operation.
  • Page 37 71, page 49. 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.
  • Page 38 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.
  • Page 39: Electrical Diagram

    [11] Jumper resistance [12] Water valve [13] Primary fan [14] ON/OFF switch [15] Secondary fan [16] AC plug [17] Main connection [18] Ignition electrodes [19] Ground post [20] Antifreeze kit connection [21] Fuse [22] Fuse 940 ESO 6 720 644 956 (2016/05)
  • Page 40: Sensor Resistance Charts

    40 | Sensor resistance charts Sensor resistance charts Fig. 61 Outlet / Inlet immersion sensor characteristics Fig. 62 6 720 644 956 (2016/05) 940 ESO...
  • Page 41: Functional Scheme

    Functional scheme | 41 Functional scheme Fig. 63 Functional scheme 940 ESO 6 720 644 956 (2016/05)
  • Page 42: Interior Components Diagram And Parts List

    [17] Water valve with engine and temperature sensor On/Off button [18] Control unit Reset button [19] Up button Program key [20] Down button [10] Flue gas limiter [21] LED [11] Heat exchanger overheat sensor 6 720 644 956 (2016/05) 940 ESO...
  • Page 43 Interior components diagram and parts list | 43 Fig. 65 Appliance overview 940 ESO 6 720 644 956 (2016/05)
  • Page 44: Components Diagram

    Combustion cover 8 700 506 300 0 Table 23 Combustion cover gasket 8 704 701 084 0 Observation window 8 705 600 003 0 Holding bracket 8 708 104 103 0 Table 23 6 720 644 956 (2016/05) 940 ESO...
  • Page 45 8 705 700 153 0 Rubber grommet 8 710 303 027 0 Overheat sensor (ECO) 8 707 206 204 0 Table 24 Heat exchanger bottom gasket 8 704 701 054 0 Table 24 940 ESO 6 720 644 956 (2016/05)
  • Page 46 2 910 952 122 0 Secondary fan - LPG 8 707 204 072 0 Table 25 Screw 8 703 403 012 0 Gas / Air Mixer 8 705 700 170 0 Table 25 6 720 644 956 (2016/05) 940 ESO...
  • Page 47 8 700 507 002 0 Gasket 8 704 701 085 0 Gas / Fan connector 8 705 202 140 0 Washer 8 704 701 062 0 Regulation screw 8 703 404 220 0 Table 26 940 ESO 6 720 644 956 (2016/05)
  • Page 48 8 700 400 033 0 O-ring bypass 8 700 205 129 0 Table 27 Hydraulic block 8 738 704 672 0 Filter 8 700 507 059 0 Filter cover 8 738 702 550 0 Table 27 6 720 644 956 (2016/05) 940 ESO...
  • Page 49 8 704 401 347 0 Screw (optional) 8 703 401 109 0 Wire harness 8 738 701 757 0 Printed circuit transceiver 8 708 300 123 0 Cable 8 704 401 244 0 Table 28 Table 28 940 ESO 6 720 644 956 (2016/05)
  • Page 50: Protecting The Environment

    ▶ Define the temperature you want, in the appliance or with the remote control. This way you have the precise water flow needed (mixing cold water to regulate temperature will increase the water flow with consequent waste of water). 6 720 644 956 (2016/05) 940 ESO...
  • Page 51: Installer Checklist To Be Completed By Installer Upon Installation

    Table 29 1) See Chapter 8.6, page 23 and gas pressure table (to be filled out by installer) Installation manual should be left with the owner after the installation is tested and completed. 940 ESO 6 720 644 956 (2016/05)
  • Page 52 6720644956...