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Bosch Appliances
250SX LP, 250SX NG manual 7 250 SX Functional scheme, 6 720 607
Models:
250SX NG
250SX LP
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Troubleshooting
Specs
Install
Parts list
refer to applicable chart below
Replacement Parts available from North American Distributor
Warranty
Reset button
Special adjustment for measuring and adjusting CO2 levels
Temperature Modulated with Electronic Ignition
Page 28
Image 28
250 SX Functional scheme
7
250 SX Functional scheme
Fig. 37 Functional scheme
28
6 720 607 057
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Image 28
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Contents
Temperature Modulated with Electronic Ignition
MODEL 250SX NG and 250SX LP
250 SX NG 250 SX LP
Intended for variable flow applications with multiple tapping points
Index
23 For your safety
Index
Warning If
Close gas valve. Open windows
2.2 250 SX Specifications Technical data
2.1 Features
2 Appliance details
Minimum recommended water pressure 30 PSI 2.07 bar Connections
2.3 Dimensions and Minimum installation clearances
Fig. 5 Dimensions
Fig. 6 Minimum clearances
Table 1 Minimum clearances
2.5 Proper location for installing your heater
2.4 General rules to follow for safe operation
2.6 Clearances
2.7 Mounting installation
2.8 Combustion air requirements
2.9 Venting
The maximum flue gas exhaust temperature on the 250 SX is 437F 225C
B Attach the flue gas exhaust accessory 8 705
Open combustion installation SINGLE PIPE SYSTEM
Room sealed installation TWIN PIPE SYSTEM
Appliance details
Description
Appliance details Recommended exhaust vent terminator position
Minimum distance
The venting materials and accessories
Vertical venting installation - Masonry
2.10 Gas piping & connections
Chimney combustion air piping not being
shown
refer to applicable chart below
FOR NATURAL GAS
Follow boxed numbers for piping just one 250 SX
example ¾” B.I. Natural Gas pipe for 20 ft 6.1m
2.11 Gas line sizing
2.12 Measuring gas pressure
2.13 Water connections
2.16 For your safety read before operating your water heater
2.14 Electrical connections
2.15 Operating instructions
2.17 Lighting and operating instructions
NOTE on a first time initial instal
3.2 Temperature selection
3.1 Power
3 Operation instructions
Fig. 29 Flow/temperature charts
Hot water temperature ºF
Hot water temperature ºC
Hot Water Flow GPM
3.3 Use of remote control accessory
3.5 Reset button
3.4 Operation
3.6 Program button
4 Maintenance and service
5 Troubleshooting
Page
By installer or service technician only
chapter
6 Electrical diagram
1 Intlet water temperature sensor 2 Ionization sensor
3 Water flow sensor 4 Over heat protection 5 Temperature limiter
11 Display PCB 12 ON/OFF switch 13 Fuse T 2,5A 14 Fuse T 3,15A
250 SX Functional scheme
7 250 SX Functional scheme
6 720 607
8 Interior components diagram and parts list
8.1 Interior components
1 Cover 2 On/Off switch 3 Reset button 4 LCD display 5 Program button
6 Temperature switches 7 Flue gas collector 8 Mixer 9 Heat exchanger
Fig. 40 Components Diagram
8.2 Components diagram
6 720 607
8.3 Parts list
Interior components diagram and parts list
Description
Reference
9 Special adjustment for measuring and adjusting CO2 levels
9.1 Adjusting the unit
clockwise
Fig. 43 Adjusting
6 720 607
10 Protecting the environment
11 Twelve Year Limited Warranty
Twelve Year Limited Warranty
Service Labor Costs
How to Make a Claim
Replacement Parts available from North American Distributor
CONTROLLED ENERGY CORP 340 Mad River Park Waitsfield, Vermont Phone
Fax 802
techsupport@controlledenergy.com Recycled paper
