CleaverBrooks S User manual

Models S, CR & HSB
Electric Boilers
Steam
Operation and Maintenance Manual
750-137
11/2012

Please direct purchase orders for replacement manuals to your local Cleaver-Brooks authorized representative
Manual Part No. 750-137
11/2012 Printed in U.S.A.
Cleaver-Brooks 2012
CLEAVER-BROOKS
Models S, CR & HSB
Electric Boilers - Steam
Operation and Maintenance Manual

This instruction and maintenance manual presents information that will help to properly operate and care for
the equipment. Study its contents carefully. The unit will provide good service and continued operation if
proper operating and maintenance instructions are followed.
Cleaver-Brooks boilers are designed and engineered to give long life and excellent service on the job. The
electrical and mechanical devices supplied were chosen because of their known ability to perform, however,
proper operating techniques and maintenance procedures must be followed at all times. Although these
components afford a high degree of protection and safety, operation of the equipment is not to be considered
free from the hazards inherent in handling electricity, pressurized hot water, and steam.
It is solely the operator’s responsibility to properly operate and maintain the equipment. No amount of writ-
ten instructions can replace intelligent thinking and reasoning and this manual is not intended to relieve the
operating personnel of the responsibility for proper operation or the application of timely preventive mainte-
nance.
It is recommended that a boiler room log or other permanent record be maintained. Recordings of daily,
weekly, monthly, and yearly maintenance activities and recording of may unusual operation will serve as a
valuable guide to any necessary investigation.
It is customary to engage the services of a qualified water treatment company or a water consultant to rec-
ommend the proper water treating practices. Contact your local Cleaver-Brooks authorized representative for
details about Cleaver-Brooks water treatment services.
The operation of this equipment must comply with all requirements or regulations of the insurance company
and/or any other authority having jurisdiction. These legal requirements take precedence over anything con-
tained herein.
DO NOT OPERATE, SERVICE, OR REPAIR THIS EQUIPMENT UNLESS YOU FULLY UNDERSTAND ALL
APPLICABLE SECTIONS OF THIS MANUAL.
DO NOTALLOW OTHERS TO OPERATE, SERVICE, OR REPAIR THIS EQUIPMENT UNLESS THEY FULLY
UNDERSTAND ALL APPLICABLE SECTIONS OF THIS MANUAL.
FAILURE TO FOLLOW ALL APPLICABLE WARNINGS AND INSTRUCTIONS MAY RESULT IN SEVERE
PERSONAL INJURY OR DEATH.
!DANGER
WARNING

750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual i
Model S, CR & HSB Electric Boilers
Table of Contents
CHAPTER 1 General Description 1-1
1.1 — Introduction 1-1
1.1.1 — Safety Precautions 1-1
1.1.2 — Abbreviations 1-2
1.2 — Application 1-2
1.3 — Description 1-2
1.4 — Principles of Operation 1-5
CHAPTER 2 Installation Instructions 2-1
2.1 — Receiving Inspection 2-1
2.2 — Location 2-1
2.3 — Piping 2-1
2.4 — Electrical 2-2
2.4.1 — Electrical Installation Checklist 2-3
2.4.2 — Recommended Torque Settings 2-4
CHAPTER 3 Pre-Start Preparation 3-1
3.1 — Inspection 3-1
3.2 — Boiler and System Cleaning 3-2
3.3 — Boiler Water Treatment 3-3

ii 750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual
CHAPTER 4 Operating Instructions 4-1
4.1 — Initial Startup 4-1
4.2 — Control Adjustment 4-2
4.2.1 — Pressure Control Setup 4-2
4.3 — Blowdown 4-3
4.3.1 — Vessel Blowdown 4-3
4.3.2 — Gauge Glass Blowdown 4-3
4.3.3 — Water Level Control Blowdown 4-4
4.4 — Maintenance 4-4
4.4.1 — Quarterly Procedure 4-4
4.4.2 — Annual Procedure 4-5
4.5 — Element Replacement Procedure 4-5
4.5.1 — Replacement of Individual Elements 4-6
CHAPTER 5 Troubleshooting 5-1
5.1 — Problems, Causes, and Actions 5-1
CHAPTER 6 Parts 6-1

750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual 1-1
CHAPTER 1 General Description
1.1 — Introduction
1.1.1 — Safety Precautions
A complete understanding of this manual is required before attempting to operate or maintain the equipment.
It is essential to read and understand all safety precautions before attempting to operate the equipment.
Failure to follow these precautions may result in damage to equipment, serious personal injury, or death.
The equipment should be operated and maintained only by personnel who have read this manual and who have
a working knowledge and understanding of the equipment.
Warning indicates a potentially hazardous situation which, if not avoided, could result in serious injury or death.
Caution indicates a potentially hazardous situation which, if not avoided, could result in damage to the equipment.
NOTE: ”NOTE:” indicates information that is vital to the operation of the equipment.
!Warning
!Caution

General Description
1-2 750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual
1.1.2 — Abbreviations
Following is an explanation of the abbreviations, acronyms, and symbols used in this manual.
1.2 — Application
The Cleaver-Brooks models S, CR & HSB are Immersion Element Steam Boilers designed for the heavy duty, con-
tinuous demand of commercial and industrial applications. They can be used as a primary, supplementary, or
auxiliary source of stem for space and process heating. The model HSB comes equipped with a 75 wsi Incoloy
element. The models S and CR come equipped with a 67 wsi Incoloy element. Some 600v models are equipped
with a 78 wsi Incoloy element.
1.3 — Description
Typical Cleaver-Brooks Models S, CR & HSB Steam Boilers are shown in Figures 1-1, 1-2, and 1-3. Illustrated
are packaged steam boilers with either horizontal or vertical insulated vessels. The boilers include control cabi-
nets mounted on a common base and operating controls, elements, fuses, contactors, safety valve, and instru-
mentation. All boilers are wired, piped, tested, and ready for installation.
The vessel construction complies with ASME Boiler & Pressure Vessel Code: either Section I, “Power Boilers,” or
Section IV, “Low Pressure Heating Boilers.” Section I vessels are either “M” stamped for 100 psi design and up
to 90 psi operating pressure (models S & CR-120 through 162) or “S” stamped for operation and design pres-
sures of 125 psi or more. Section IV vessels have the “H” stamp for 15 psi design for 13 psi maximum operating
pressure. All boilers are National Board inspected and registered, and are UL listed.
Refer to the Dimension Diagram (DD) and Wiring Diagram (WD) prepared by Cleaver-Brooks for your specific
installation.
Abbreviation Explanation Abbreviation Explanation
ASME American Society of Mechani-
cal Engineers
LWCO Low Water Cut Off
AR Automatic Reset MR Manual Reset
BHP Boiler Horsepower pH Measure of the degree of acid
or base of a solution
BTU British Thermal Unit P/N Part Number
C Degree Celsius PPB Parts Per Billion
F Degree Fahrenheit PPM Parts Per Million
GPM Gallons Per Minute PSI Pounds Per Square Inch
Ht Height T Temperature
Hz Hertz TC Temperature Control
KW Kilowatt TI Temperature Gauge
Lb Pound wsi Watts Per Square Inch

750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual 1-3
1.3 — Description
The following items are standard on all Cleaver-Brooks Electric Steam Boilers.
Component Description
1. Main Lugs for Supply Circuit Standard boilers are supplied with solderless wire connectors suitable for
copper supply wires. The main lugs are mounted on distribution busses
that provide individual connections for each heating element circuit. Stan-
dard boilers are designed for top connection to main power supply.
2. Supplemental Internal Protection
Fuses
Boilers are provided with supplemental internal protection fuses rated at
approximately 125% of the element circuit load. These current-limiting
cartridge fuses have a minimum 200,000 ampere interrupting capacity to
provide protection for the element circuit wiring.
3. Built-In Magnetic Contactors All boilers use definite purpose magnetic contactors designed for use with
resistance heating loads. Contactors are rated for at least 50 amps resis-
tive load and a minimum of 500,000 duty cycles.
4. Heating Elements Standard heating elements are Incoloy sheathed and rated at 75 watts
per square inch (model HSB), or 67 or 78 wsi (models S and CR). These
elements are individually replaceable.
5. 120 Volt Control Circuit All boilers have 120 volt control circuits. Control circuit transformers with
primary fusing and grounded secondary are provided on all models,
except when the customer specifies a 208/120 volt, 3-phase, 4-wire con-
figuration. All boilers have 120 volt control circuits and are available for
either 50 or 60 Hz.
6. Customer Control Interlock Con-
nection
A terminal slip is provided on all boilers for connection of the customer’s
control devices and interlocks.
7. High Pressure Cutoff All standard boilers with more than 2 control steps are supplied with one
automatic-resetting and one manual-resetting high pressure cutoff. These
normally are set at 10% and 5% below the safety valve set pressure
respectively, unless otherwise specified. On smaller boilers, one auto-
resetting high pressure cutoff is standard as a backup to the limit duty
rated pressure control.
8. Water Level Controller/Low Water
Cutoff
An automatic resetting, float type, combination low water cutoff and
water level controller is installed on each Cleaver-Brooks electric steam
boiler. If the vessel water level drops, the controller closes a switch, which
may be used to operate either a feed-pump relay or feedwater solenoid
valve. If the water level drops below the cutoff level, the heating elements
are de-energized by the controller until the water level returns to operating
level.

General Description
1-4 750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual
The following optional equipment can be furnished by Cleaver-Brooks. The Dimension Drawings (DD) and Wiring
Diagrams (WD) shows the optional boiler equipment:
1. Manual reset low water cutoff
2. Auxiliary low water cutoff (manual or auto-reset)
3. Low pressure alarm
4. Pilot lights for individual steps
5. Toggle switches to enable/disable individual steps
6. Solid state progressive sequencing step control
7. Preheat switch
8. Demand limiting controls or interface
9. Control cabinet door interlock
10. Boiler disconnect switch or circuit breaker (with or without shunt trip, shipped loose for field mounting)
11. Ground fault detection
12. Metering ammeter, voltmeter or KWH meter
13. Alarm circuit (with or without horn/silence push button)
14. Automatic surface blowdown system
15. Local/remote modulation switch
16. SCR controller
9. Pressure Control System Boilers with 1 and 2 stages of control are standardly provided with on-off
pressure controls. Larger boilers are provided with a solid state, propor-
tional, modulating step-type pressure control system. As the system
steam pressure varies, the pressure control system proportions the input
power to the boiler demand, by increasing (or decreasing) the number of
heating element groups (steps) in use.
Both control systems (on-off and proportional) have adjustable pressure
ranges. The on-off controls have fixed differentials. The proportioning con-
trols have adjustable proportioning ranges.
This proportional solid state electronic sequencers also have an adjustable
time delay between steps varying from 5 seconds up to 10 minutes.
These adjustable controls enable the boiler to be tuned to the system it
regulates in order to optimize boiler responsiveness and system operation.
The controller features rapid recycling after power interruption. When
power is restored, the boiler starts with all elements off. To prevent cur-
rent surges, the step control ensures that the element groups are switched
on, one at a time.
10. Pilot Switch and Pilot Lights Pilot lights are standardly provided to indicate “power on,” “high pres-
sure,” and “low water.”
11. Safety Valve The safety valve is properly sized according to the boiler’s electrical rating
and per ASME and National Board.
12. Built-In Condensate/make-Up
Tank and Feedpump (model CR boil-
ers only)
This includes a condensate return tank and feedwater pump, completely
wired and piped. The condensate return tank is provided with a float-type
make-up valve, drain valve, and the necessary condensate return, vent,
and overflow connections.
Component Description

750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual 1-5
1.4 — Principles of Operation
17. Feedwater valve
18. Other miscellaneous options
1.4 — Principles of Operation
Immersion element steam boilers consist of a number of resistance-type heating elements assembled within a
pressure vessel. Electrical power applied to these elements is converted into heat and conducted into the sur-
rounding water. Steam bubbles form at the element surface and then rise to the steam place at the top of the
vessel.
Controls are provided in order to match the input of electricity with the load requirements of the system. Heating
elements are switched on and off by magnetic contactors in response to the pressure control system. The sim-
plest pressure control consists of a single pressure activated switch that energizes all heating elements simulta-
neously. This on-off control is suitable for small steam boilers (single stage). For 2-stage boilers, two pressure
controls are used to provide on-off switching of selected element groups at different settings.
The close control of boiler output demanded by large, complex, or critical steam systems requires the use of fully
modulating step controls. To proportion input power to steam demand, these modulating step controls select the
number of heating element groups, or steps, in sequence, in order to maintain the desired steam pressure.

General Description
1-6 750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual

750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual 2-1
CHAPTER 2 Installation Instructions
2.1 — Receiving Inspection
Each Model S, CR and HSB boiler is completely inspected at the factory and carefully packaged for shipment.
Inspect the packing for signs of exterior damage. After placing the unit as close as possible to the point of actual
installation, carefully uncrate and check all boxes and cartons against the packing slip. In case of damage or
shortage, notify the carrier immediately.
2.2 — Location
Consult local codes for specific requirements. Refer to the Dimension Drawings (DD) and Wiring Diagram (WD)
prepared by Cleaver-Brooks for your specific installation. Position the boiler to provide adequate clearance on all
sides for necessary access when operating and servicing the boiler.
Set the boiler on a strong foundation and make sure it is level. The boiler must be level so that the water gauge
glass indicates the true water level and so that the water level controller functions properly.
2.3 — Piping
Install the steam and water lines according to the job requirement.
Installation should be performed only by qualified personnel who are familiar with this equipment. Failure to heed
this warning may result in serious personal injury or death.
Before proceeding, make sure you have read and understand the contents of this manual. Failure to do so may result
in serious personal injury or death.
!Warning

Installation Instructions
2-2 750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual
The steam piping from the boiler to the point of steam use must be pitched to assure proper drainage of conden-
sate formed in the steam line. If possible, pitch the horizontal runs away from the boiler and provide a drip leg at
the end of the run and at any other low points so that the condensate runs away from the boiler.
A condensate return line must be installed with a minimum pitch of 1/4” per foot toward the condensate
receiver.
When a direct water feed is used, the water supply main must have a pressure of at least ten pounds greater
than the maximum pressure at which the boiler is to be operated. A solenoid valve is usually required to control
the flow of feedwater to the boiler. Solenoid valves should be sized to feed the boiler at twice the steaming rate
(#/hr. divided by 500 = steaming rate in gpm). The coil should be the same voltage as the boiler control circuit
(refer to the Wiring Diagram).
It is recommended that a vacuum breaker be installed in the steam line when a condensate return system is
being used. The breaker will prevent flooding of the boiler during shutdown.
2.4 — Electrical
The procedures listed here are based on requirements of the National Electrical Code. Local electrical codes and/
or boiler codes may require slightly different procedures. It is therefore recommended that the electrical installa-
tion be performed under the supervision of a qualified and licensed electrical contractor familiar with local codes
and inspection procedures.
Typical electric steam boilers are designed for top connection to the main supply lugs and are supplied with sol-
derless wire connectors suitable for copper supply wires.
• The main supply lugs should be tightened (with power off) every 24 hours for the first week of operation.
• After the first 30 days of operation, all electrical power connections should be tightened (with power off).
Discharge from the boiler blowdown and safety valves is hot and could burn or scald personnel. It is of the utmost
importance that these valves are piped to a safe point of discharge, and that pipes are insulated or guarded to pre-
vent burns due to accidental contact, serious personal injury, or death. The piping for all blowdown must be the same
size as the blowdown valve.
NOTE: These water and steam pipe installation instructions are for your guidance only. In all piping installations, be
sure to check that the piping is in accordance with applicable federal, state, and local codes, regulations, and other
statutory requirements.
Lockout and disconnect main power before proceeding with electrical installation in order to avoid the hazard of elec-
trical shock, which could cause serious personal injury or death.
!Warning
!Warning

750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual 2-3
2.4 — Electrical
If aluminum supply wires are selected, Cleaver-Brooks strongly recommends that the installing electrical contrac-
tor splice a short length of copper wire to the aluminum supply conductors and terminate this copper wire in the
main supply lugs on the unit. If copper splices are not used and the customer chooses to terminate the aluminum
supply wires directly in the main supply lugs, the following points should be carefully followed:
•An oxide inhibitor paste should be applied liberally to the conductors.
•The main supply lugs should be tightened (with power off) every 24 hours for the first week of operation.
•After the first week, the main supply lugs should be tightened (with power off) once every 30 days.
•After the first 30 days of operation, all electrical power connections should be tightened (with power off).
Power wiring should be selected for high temperature use (minimum wire rating, 75 deg. C per National Electri-
cal Code) and/or per local electrical codes.
2.4.1 — Electrical Installation Checklist
1. Check all electrical connections for tightness. Vibration during transit sometimes loosens connections. See
Section 2.4.2 for recommended torque settings.
2. Check the boiler nameplate for the boiler kilowatt rating, frequency, voltage, amperage, and to determine
whether it is single or three-phase.
3. Check the electrical supply voltage to verify that it conforms to the boiler requirements, and that sufficient cir-
cuit capacity is available for the boiler.
4. Refer to the Wiring Diagram (WD) prepared by Cleaver-Brooks for your specific installation for the number and
rating of supply circuits required by the boiler.
5. Refer to the Wiring Diagram (WD) prepared by Cleaver-Brooks for your specific installation for proper wire and
conduit sizes for these ratings.
6. Install the wiring to the boiler and connect it to the main supply lugs as indicated on the boiler Wiring Diagram
(WD).
7. All Cleaver-Brooks electric steam boilers are supplied with factory-mounted magnetic contactors. All internal
circuits are factory installed and tested.
8. The external solenoid valves for the feedwater supply may be connected to the boiler control circuit. Refer to
the boiler Wiring Diagram (WD) for details and voltage.
Before tightening the main supply lugs, lockout and disconnect the main power to avoid the hazard of electrical
shock, which could cause serious personal injury or death.
Main supply lugs should be tightened every 24 hours during the first week of operation in order to avoid damage to
the equipment. After the first week, the main supply lugs should be tightened (with power off) once every
30 days. After the first 30 days of operation, all electrical power connections should be tightened (with power off).
!Warning
!Caution

Installation Instructions
2-4 750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual
9. If an external feedwater pump is to be used, it will require a separate electrical supply circuit and a magnetic
motor starter (coil not to exceed 25-VA). This circuit can be controlled through the unit control circuit. CR
Series boilers have built-in boiler feed pump and controls.
10. Upon completion of all installation work, recheck all of the connections for tightness and test for correct con-
trol circuit operation as described in Chapter 4 of this manual. See Section 2.4.2 for recommended torque
settings.
2.4.2 — Recommended Torque Settings
The following table notes typical torque settings only, as recommended by Cleaver-Brooks. Specific components
may differ between boilers. ALWAYS adhere to each component’s recommended torque setting for specific wire
size and type (often located on component’s factory label).
To avoid the hazard of electrical shock: On boilers requiring more than one supply circuit, be sure that phasing is cor-
rect and circuits are not “mixed” before energizing. Failure to observe this warning could cause serious personal
injury or death.
Recommended torque settings
Electric boilers - main control panel
Power distribution blocks (6AWG - load side) 45 in lbs
Fuse blocks for contactors (6AWG) 45 in lbs
Contactor, 50A res. (6AWG - line side) 45 in lbs
Contactor, 50A res. (8AWG - load side) 40 in lbs
Specific components may differ between boilers. ALWAYS adhere to each component’s recommended
torque setting for specific wire size and type (often located on component’s factory label).
!Warning
!Caution

750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual 3-1
CHAPTER 3 Pre-Start Preparation
3.1 — Inspection
Boilers which have been exposed to dust or wet or humid conditions must be thoroughly cleaned and dried out.
The buildup of dust and rust on the contactors or moisture at the terminal end of the elements may result in
severe damage. The following precautions must be taken:
1. Make certain all electrical connections and element terminals are thoroughly cleaned, dried, and tightened.
2. Inspect all contactors, fuse bases, and wire bundles for stray or loose metal objects (screws, bolts, metal
shavings, knockout slugs, etc.) that may lodge there. All such material must be removed before startup.
3. The elements may accumulate moisture during shipment or storage prior to operation. This moisture will turn
to steam when the elements are turned on, rupturing the element casing.
Before proceeding, make certain Chapters 1 and 2 of this manual have been read and understood. Failure to do so
may result in serious personal injury or death.
Pre-startup should be performed by a qualified technician who is familiar with this equipment. Failure to heed this
warning may result in serious personal injury or death.
Lockout and disconnect the main power to avoid the hazard of electrical shock, which could result in serious personal
injury or death.
Moisture in the elements may result in damage to the elements.
!Warning
!Warning
!Caution

Pre-Start Preparation
3-2 750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual
To check for this condition, take a reading with an ohmmeter between one of the contactor terminals (load side)
to ground for each contactor. If the reading is less than 17,000 ohms for a standard 3-phase connection, or
50,000 ohms for a single element, remove the fuses going to that contactor. The fuses should be removed so
that, during the first day of operation, the affected element will not be energized, allowing the hot boiler to drive
the moisture out at a controlled rate.
There are alternate heating methods. Direct a heat lamp at the offending elements or remove the element assem-
bly, bake it in a 200º F oven for 8 hours, then reinstall and rewire. Following any of these procedures, the sus-
pect element then may be put in operation by replacing the fuses after the elements have been rechecked with
an ohmmeter.
3.2 — Boiler and System Cleaning
The entire steam system must be cleaned prior to startup. No matter how carefully a system is installed, it will
be contaminated with pipe dope, thread cutting oils, soldering flux, rust preventatives, core sand, welding slag,
and dirt, sand, or clays.
Cleaning a how water system (either steel or copper piping) is neither difficult nor expensive. The three most
common materials used for cleaning are (in order of preference):
•Trisodium Phosphate (TSP)
•Sodium Carbonate
•Sodium Hydroxide (lye)
Prepare the cleaning solutions as follows, DO NOT mix together different types of cleaners.
Lock out and disconnect the main power to avoid the hazard of electrical shock, which could result in serious per-
sonal injury or death.
Material Specifications
Trisodium Phosphate (TSP) one lb. for every fifty gallons in the system
NOTE: Check local codes for restrictions on the use of TSP.
Sodium Carbonate one lb. for every thirty gallons in the system
Sodium Hydroxide (lye) one lb. for every fifty gallons in the system
NOTE: Do not use Sodium Hydroxide for copper or galvanized systems.
Cleaning compounds are hazardous and personal protective equipment must be used when mixing or handling chem-
icals and chemical solutions in order to avoid possible serious personal injury or death.
!Warning
!Warning

750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual 3-3
3.3 — Boiler Water Treatment
Fill, vent, and circulate the system with one of the solutions, allowing it to reach operating temperatures, if pos-
sible. After circulating for three hours, drain the system completely and refill it with fresh water. Usually enough
of the cleaner will adhere to the piping to give an alkaline solution satisfactory for operation. A pH reading
between 8.5 and 9.5 is preferred, and a small amount of cleaner can be added, if necessary, to raise the pH
value.
There are definite indications of an unclean system. If any of the following conditions are present when filling the
system, the boiler and associated system piping need cleaning:
•Obviously discolored, dirty water.
•A pH or alkalinity test that gives a pH test reading below 7 (below 7 indicates the water in the system is acidic
and corrosive).
•The appearance of dirty foam or scum lines on the surface.
In some cases, there are sufficient quantities of such materials to break down chemically during the operation of
the system causing gas formation and acidic system water. All such materials should be removed.
Steam systems, in most cases, naturally operate with a pH of 8.5 or higher. If a system indicates pH values
below 7 on the scale the following conditions may be present:
•Gas formation in the system.
•Pump seal and gland problems.
•Air vent sticking and leaking.
•Piping leaks at the joints.
If system deterioration is permitted and leaks develop and water losses increase, it is possible to cause serious
damage to the boiler. Therefore, it is important to have a closed system that is clean, neutral, and water tight.
3.3 — Boiler Water Treatment
The recommended water quality to facilitate keeping the boiler clean and to prevent corrosion and scaling is:
These recommended guidelines do not include all dissolved minerals. For more information about maintaining
water quality, contact your Cleaver-Brooks local representative.
The purchaser should be sure that the boiler is not operated for long periods for approval tests, temporary heat,
or any other operations without water treatment. It also should be noted that water boilers will need chemical
treatment for the first filling of water and additional periodic chemical treatment.
pH 8.3 - 10.5
Iron 0.1 PPM maximum
Alkalinity <600 PPM maximum
Chlorides 30 mg/liter maximum
Oxygen 0.1 mg/liter maximum
Specific Conductivity 4500 mmho/cm
Total Hardness <3 PPM maximum

Pre-Start Preparation
3-4 750-137 (revised 2012)
Model S, CR & HSB Electric Boiler Manual
Water treatment may vary from season to season or over a period of time; therefore, there should be a require-
ment that the water treatment procedure be checked no less than four times a year, and possibly more fre-
quently, as the local water conditions may require.