Well-mcLain SVF 725 User manual

Models 725-1000
Commercial Condensing
Gas-Fired Water Boilers
User Manual
Manual Part Number 550-100-291/1122
!
WARNING
If the information in this manual is not followed exactly, a re or explosion may result, causing
property damage, personal injury or loss of life. Do not store or use gasoline or other ammable
vapors and liquids in the vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS —
•Do not try to light any appliance.
•Do not touch any electrical switch; do not use any telephone in your building.
•Immediately call your gas supplier from a neighbor’s telephone. Follow the gas supplier’s instructions.
•If you cannot reach your gas supplier, call the re department.
•Installation & service must be performed by a qualied installer, service technician or the gas supplier.

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SECTION 1 –SAFETY 3
Safety Signals . . . . . . . . . . . . . . . . . . . . . . 3
Please Read Before Proceeding . . . . . . . . . . . . 3
Boiler Maintenance . . . . . . . . . . . . . . . . . . . . . . .3
Safe Boiler Operation. . . . . . . . . . . . . . . . . . . . . .4
Boiler Water . . . . . . . . . . . . . . . . . . . . . . . . . .4
Frozen Water Damage . . . . . . . . . . . . . . . . . . . . .4
Damage from Water Contact . . . . . . . . . . . . . . . . . .4
SECTION 2 –OPERATION 5
Operating the Boiler. . . . . . . . . . . . . . . . . . . 5
Prevent Combustion Air Contamination . . . . . . . . . . . .5
Boiler Operation . . . . . . . . . . . . . . . . . . . . . . . .6
Boiler Control . . . . . . . . . . . . . . . . . . . . . . 8
Controller Startup. . . . . . . . . . . . . . . . . . . . . . . . 8
Navigating the Touchscreen Interface . . . . . . . . . . . . . 9
Time and Date . . . . . . . . . . . . . . . . . . . . . . . .10
SECTION 3 –MAINTENANCE 11
Maintenance Overview . . . . . . . . . . . . . . . . .11
Servicing and Maintaining the Boiler . . . . . . . . . . . . . 11
Maintenance Procedures — DAILY. . . . . . . . . . 12
Check the Boiler Area . . . . . . . . . . . . . . . . . . . . 12
Check the Pressure and Temperature Gauge . . . . . . . .12
DIRECT EXHAUST Installations . . . . . . . . . . . . . . .12
DIRECT VENT Installations . . . . . . . . . . . . . . . . . 12
Maintenance Procedures — MONTHLY . . . . . . . 13
Check Vent Piping . . . . . . . . . . . . . . . . . . . . . . 13
Check Air Piping (Direct Vent Systems) . . . . . . . . . . . 13
Check the Relief Valve . . . . . . . . . . . . . . . . . . . .13
Check the Condensate Drain System . . . . . . . . . . . . 13
Check Automatic Air Vents . . . . . . . . . . . . . . . . . .14
Maintenance Procedures — EVERY 3 MONTHS. . . 15
Test the Low Water Cuto󰀨 . . . . . . . . . . . . . . . . . . 15
Check the Time and Date . . . . . . . . . . . . . . . . . . 15
Maintenance Procedures — EVERY 6 MONTHS. . . 16
Check the Water and Gas Piping. . . . . . . . . . . . . . . 16
Operate the Relief Valve . . . . . . . . . . . . . . . . . . .16
Maintenance Procedures — END OF SEASON . . . 17
To Continue Operation for DHW . . . . . . . . . . . . . . .17
To Leave the Boiler in Stand-By Mode . . . . . . . . . . . .17
To Shut Down the Boiler . . . . . . . . . . . . . . . . . . .17
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . 18
How to Use This Manual
Contents
To do the following: Read and Use: Page(s)
Learn precautions Safety warnings and information 3-4
Prevent air contamination List of air contaminants to avoid 5
Start or shut down the boiler Operating instructions 6
Identify and locate boiler
components Boiler illustrations 7
Utilize the control display Control illustrations and information 8-10
Maintain the boiler Boiler maintenance schedules 11-17

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This section is intended to provide safety information
for users.
Section Contents
Safety Signals . . . . . . . . . . . . . . . . . . . . . . . . . 3
Please Read Before Proceeding . . . . . . . . . . . . . . . .3
Safety Signals
The following dened terms are used throughout this
manual to bring attention to the presence of hazards
or other important information.
DANGER
!
Danger indicates the presence of hazards that
will cause severe personal injury, death, or
substantial property damage.
!
WARNING
Warning indicates the presence of hazards that
can cause severe personal injury, death, or
substantial property damage.
CAUTION
!
Caution indicates the presence of hazards
that will or can cause minor personal injury or
property damage.
NOTICE
Notice indicates additional information that may be
related to property damage, but is not related to
personal injury.
IMPORTANT
Important indicates additional information that is
important, but is not related to personal injury or
property damage.
Please Read Before Proceeding
!
WARNING
Adhere to all following guidelines and
instructions in this section. Failure to adhere to
these guidelines can result in severe personal
injury, death, or substantial property damage.
User: Refer to this User Manual as your information
source. Installation and service must be performed
by a qualied installer, service technician, or gas
supplier.
Installer: Refer to the Boiler Manual and all other
information shipped with the boiler for installation and
service.
Please include the boiler model number, CP number,
and serial number when calling or writing about the
boiler. The model number can be found on the boiler
rating label.
IMPORTANT
Any claims for damage or shortage in shipment
must be led immediately against the transportation
company by the consignee.
Boiler Maintenance
To avoid electric shock, disconnect all electrical
supplies to the boiler before performing
maintenance.
To avoid severe burns, allow boiler to cool before
performing maintenance.
This boiler contains ceramic ber and berglass
materials. Refer to the maintenance section of
the boiler manual for warnings and information.
The boiler must be maintained as outlined in this
manual, including annual startup and service by
a qualied service technician to ensure boiler
system reliability.
Section 1
Safety

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Safe Boiler Operation
• Do not block ow of combustion or ventilation
air to boiler. This boiler is equipped with a control
that automatically shuts down the boiler if the air
or vent is blocked. Remove easily accessible and
removable blockages. If the boiler indicates a
manual reset lockout, select <Reset Lockout> on
the control display after removing a blockage. If
a blockage cannot be removed, have a qualied
service technician check the boiler system.
• Do not allow contaminated air to enter the boiler room,
or the air inlet pipe if direct vented. See page 5for
details.
• Should overheating occur, or gas supply fail to
shut o󰀨, do not turn o󰀨 or disconnect electrical
supply to pump. Shut o󰀨 the gas supply at a
location external to the appliance.
Boiler Water
• Have the boiler water chemistry checked at least
annually by a qualied service technician.
• Do not use petroleum-based cleaning or sealing
compounds in the boiler system. Gaskets and seals
in the system may be damaged, which can result in
substantial property damage.
• Do not use "homemade cures" or "boiler patent
medicines." Serious injury or damage may result.
• Continual fresh make-up water will reduce boiler
life. Mineral buildup in the heat exchanger reduces
heat transfer, overheats the metal, and causes
failure. Addition of oxygen carried in by make-up
water can cause internal corrosion. Leaks in the
boiler or piping must be repaired at once to prevent
make-up water.
• Do not add cold water to a hot boiler. Thermal
shock can cause the heat exchanger to crack.
• NEVER use automotive or standard glycol
antifreeze inn this boiler system, including glycol
made for hydronic systems.
Frozen Water Damage
Power outages, unattended residences or buildings,
boiler component failures, or other electrical system
failures in cold weather could result in frozen plumbing
and water damage in a matter of hours. Consult with
a boiler contractor or a home security agent to take
preventative actions, such as installing a security
system that operates during power outages, senses
low temperature, and initiates an e󰀨ective action.
Consult with your boiler contractor or a home security
agency.
Damage from Water Contact
DANGER
!
DO NOT attempt to operate any boiler if any
part of the boiler, burner, or controls has been
partially or fully sprayed with or submerged
under water. The boiler must either be replaced
or completely repaired and inspected. The boiler
and all components must be in good condition
and fully reliable before operation.
If these requirements are not met, operating
the boiler will cause re, explosion, and electrical
shock hazards, leading to serious injury, death,
or substantial property damage.
Saltwater damage: The immediate e󰀨ects of
saltwater damage are like those of freshwater,
with electrical components shorting out and the
removal of critical lubricants. However, salt and other
contaminants left behind can lead to long term issues
due to the conductive and corrosive nature of salt
residue. WM Technologies equipment contaminated
with saltwater or polluted water will no longer be
covered under warranty and should be replaced.
Electrical damage: If any electrical component or
wiring has, or is suspected to have come into contact
with water, replace the boiler.
Please Read Before Proceeding, continued

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This section is intended to provide operating
instructions and information for users.
Section Contents
Operating the Boiler . . . . . . . . . . . . . . . . . . . . . . 5
Boiler Control . . . . . . . . . . . . . . . . . . . . . . . . . .8
Operating the Boiler
Prevent Combustion Air Contamination
!
WARNING
If the boiler combustion air inlet is located in any
area likely to cause contamination, or if products
which would contaminate the air cannot be
removed, you must have the combustion air and
vent repiped and terminated to another location.
Contaminated combustion air will damage the
boiler, and can result in severe personal injury,
death, or substantial property damage.
Do not operate an SVF boiler if the combustion air
inlet is located in a laundry room or pool facility.
These areas will always contain hazardous
contaminants.
Pool and laundry products, hobby products, and
other common household products often contain
uorine or chlorine compounds. These chemicals can
form strong acids when they pass through the boiler.
The acid can eat through the boiler wall, causing
serious damage. This damage presents a possible
threat of ue gas spillage or boiler water leakage into
the building.
If contaminating chemicals will be present near
the location of the boiler combustion air inlet, have
your installer pipe the boiler combustion air and
vent to another location per the boiler manual. See
Table 1 for a list of products to avoid, and areas
where contaminants are likely present.
Section 2
Operation
Products to avoid
Spray cans containing chloro/uorocarbons
Permanent wave solutions
Chlorinated waxes and cleaners
Chlorine-based swimming pool chemicals
Calcium chloride used for thawing
Sodium chloride used for water softening
Refrigerant leaks
Paint or varnish removers
Hydrochloric acid and muriatic acid
Cements and glues
Anti-static fabric softeners used in clothes dryers
Chlorine-type bleaches, detergents, and cleaning solvents
Adhesives used to fasten building products and other similar products
Excessive dust and dirt
Areas likely to have contaminants
Laundry and dry cleaning areas and establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture renishing areas and establishments
New building construction
Remodeling areas
Garages with workshops
Table 1 Corrosive contaminants and sources

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Boiler Operation
See the warnings and operating instructions below and the gures on page 6 to start and turn o󰀨 the boiler.
Operating the Boiler, continued
Figure 1 Operating instructions, warning
3. Close external manual gas cock (valve handle perpendicular to gas
piping). Remove boiler access door. Turn boiler manual gas valve handle
clockwise  to close gas supply.
4. Reinstall boiler access door.
550-101-262 (0218)
1. Stop! Read the safety information at left on this label. This appliance is
equipped with an ignition device which automatically lights the burner. Do not
try to light the burner by hand.
2. Set room thermostat(s) to lowest setting. Verify external manual gas cock is
open (valve handle parallel to gas piping).
3. Turn OFF all electrical power to the appliance.
4. Remove boiler access door.
5. Turn boiler manual gas valve handle counterclockwise  to open gas
supply.
6. Wait five (5) minutes to clear out any gas. Then smell for gas, including near
the floor. If you smell gas, STOP! Follow "B" in the safety information to the
left. If you don't smell gas, go to the next step.
7. .Turn ON all electrical power to the appliance
8. Set thermostat(s) to desired setting.
9. The display will show symbols and text describing the status of the boiler as it
proceeds through its operating sequence.
10. If the appliance will not operate when there is a call for heat and piping is not
hot, follow the instructions "To Turn Off Gas To Appliance" below and call your
service technician or gas supplier.
11. Reinstall boiler access door. Make sure panel is seated firmly in
place.
OPERATING INSTRUCTIONS
1. Set room thermostats to lowest setting.
2. .Turn OFF all electrical power to the appliance
TO TURN OFF GAS TO THE APPLIANCE
to CLOSE
to OPEN
Gas valve
OPEN
Gas valve
CLOSED
FOR YOUR SAFETY
READ BEFORE OPERATING
• Do not try to light any appliance.
• Do not touch any electric switch; do not
use any phone in your building.
• Immediately call your gas supplier
from a neighbor's phone. Follow the
gas supplier's instructions.
• If you cannot reach your gas supplier,
call the fire department.
If you do not follow these instructions exactly, a
fire or explosion may result causing property
damage, personal injury or loss of life.
C. Use only your hand to turn the gas
valve handle. Never use tools. If the
handle will not turn by hand, don't try
to repair it, call a qualified service
technician. Force or attempted repair
may result in a fire or explosion.
D. Do not use this appliance if any part
has been under water. Immediately
call a qualified service technician to
inspect the appliance and to replace
any part of the control system and
any gas control, which has been
under water.
A. This appliance does not have a pilot. It is
equipped with an ignition device which
automatically lights the burner. Do not
try to light the burner by hand.
B. Before OPERATING, smell all around the
appliance area for gas. Be sure to smell
next to the floor because some gas is
heavier than air and will settle on the
floor. See below.
WHAT TO DO IF YOU SMELL GAS

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220068
External
manual
gas valve
External
manual
gas valve
Union
Union
From gas supply
From gas supply
Boiler gas
connection
Boiler gas
connection
220138
External manual
gas valve
External manual
gas valve
Union
Union
From gas supply
From gas supply
Boiler gas
connection
Boiler gas
connection
220171
Boiler Power
Switch
Boiler Manual
Internal Gas Valve
Screen Display - use to monitor
boiler operation, change heating
system setpoints, and enable or
disable the burner.
Screen Display - use to monitor
boiler operation, change heating
system setpoints, and enable or
disable the burner.
220172
Boiler Power
Switch
Boiler Manual
Internal Gas
Valve
Screen Display - use to monitor
boiler operation, change heating
system setpoints, and enable or
disable the burner.
Screen Display - use to monitor
boiler operation, change heating
system setpoints, and enable or
disable the burner.
Figure 2 SVF 725/850 power switch, screen display,
and internal gas valve
Figure 3 SVF 1000 power switch, screen display, and
internal gas valve
Figure 4 SVF 725/850 external gas piping (by installer) Figure 5 SVF 1000 external gas piping (by installer)

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Controller Startup
Once the boiler is powered on, the NURO®controller
displays the initial boot followed by the Startup
screen. During the initial boot, the NURO controller
loads the display software, parameter settings, and
conrms communication between components before
initializing the user interface startup screen. See
Figure 6 for the various screens mentioned in this
section.
Once startup is completed, the EULA (End-User
License Agreement) screen will appear. Once you
agree with the License Agreement, press <Accept>.
IMPORTANT
If the controller encounters any errors during the
startup process, the BootLoader screen will appear.
Call your qualied service technician for assistance.
Next, the Local Representative screen will
appear, which can be used to provide the boiler
operator with contact information for the local service
representative. This information can be edited
through the Local Rep Setup screen (Settings>User
Settings).
The Local Representative screen will automatically
timeout after 30 seconds, or press <Home> to
proceed to the Home screen.
Error Screen
In the event of an error, the “Status Bar” at the top
will turn red in color and display the <Press for
Information> button, which will access the Error
screen. Refer to Figure 7, page 9. Use the Error
screen to learn about the error, the status of the boiler
at the time of the error, and troubleshooting steps.
Boiler Control
Figure 6 Controller startup screens
State: Running
220043
220149
220166
BootLoader Error Screen Local Representative Screen Home Screen

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Navigating the Touchscreen Interface
There are several items featured on the touchscreen
display designed to simplify navigation. For example,
each screen features the “Status Bar”, seen at the
top of the gures in this section
This “Status Bar” displays the current operational
status toward the left, the current date & time in the
top right, and the active screen name to the right. The
active screen name is helpful when cross-referencing
the User Manual or when calling a service technician.
Figure 7 Touchscreen features
Home Screen Error Screen ExampleInformation Screen
220167
BUTTONS
• Text based & some may feature an icon
• Causes an action
• Grayed out buttons are not available for use
HOME BUTTON • Returns to the main home screen
STATUS BAR • System status, date/time, screen name, and touching bar
enters current alarm information, refer to (Section 3.5.4).
CONTENT AREA
• Middle area of screen
• User can scroll up or down through lists of values, texts, or
parameters. Scroll bar will appear on right side of screen.

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Time and Date
When the NURO controller is connected to an
active internet connection, the time and date can set
automatically.
Activate the automatic setting through the following
path: Home> Settings> All Parameters> Boiler
Settings> General Boiler Settings. Scroll to the
bottom of the screen, then push the <Modify> button
by the parameter, "Get Time from the Internet."
Select <On> then push <Accept>. The date and time
will now set automatically.
If internet access is not available to the controller,
you can set the time and date manually: Home>
Settings> User Settings> Time & Date. Change as
necessary and click <Set Time>. See Figure 8.
Boiler Control, continued
Figure 8 Setting the time and date
220149
State: Standby
220046
220173
State: Standby
220174
State: Standby
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This section is intended to provide service schedules
and maintenance information for users.
Section Contents
Maintenance Overview . . . . . . . . . . . . . . . . . . . . 11
Maintenance Procedures — DAILY . . . . . . . . . . . . . 12
Maintenance Procedures — MONTHLY . . . . . . . . . . .13
Maintenance Procedures — EVERY 3 MONTHS . . . . . . 15
Maintenance Procedures — EVERY 6 MONTHS . . . . . . 16
Maintenance Procedures — END OF SEASON . . . . . . . 17
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Maintenance Overview
Servicing and Maintaining the Boiler
The boiler must be inspected and started at the
beginning of the heating season every year by a
qualied service technician.
The maintenance and service of the boiler listed
in Figure 9 and explained in this manual must be
performed to assure maximum boiler e󰀩ciency and
reliability.
Section 3
Maintenance
Owner Maintenance
(see the following pages for instructions)
Beginning of Season
Contact your boiler service technician to inspect, service, and start up your boiler. You
must have an annual start-up performed by a qualied service technician to ensure reliable
operation of the boiler and system.
Daily
Check the boiler area.
Check air openings.
Check the pressure and temperature gauge.
Verify the boiler panels are securely in place.
Monthly
Check the vent piping.
Check the air piping.
Check the relief valve.
Check the condensate drain system.
Check the air vents.
Every 3 Months Test low water cuto󰀨 by pressing the test button.
Check the time and date on the control display.
Every 6 Months Check the boiler gas and water piping.
Operate the relief valve.
End of Season Shut down the boiler (unless the boiler is used for domestic water).
!
WARNING
Follow the service and maintenance procedures given in this manual. Failure to perform service and
maintenance could result in damage to the boiler or system. Failure to follow the directions in this manual
and component literature could result in severe personal injury, death, or substantial property damage.
Figure 9 Service and maintenance schedule

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Check the Boiler Area
Eliminate all combustible materials and air
contaminants from the vicinity of the boiler and
combustion air inlet.
If contaminants or ammable materials are found,
immediately remove the products from the area; if
they have been there for an extended period of time,
call a qualied service technician to inspect the boiler
for possible damage from acid corrosion.
If contaminants or ammable materials are found
but cannot be removed, immediately call a qualied
service technician to repipe the vent and air piping to
locate the vent termination and air intake away from
the contaminated areas.
!
WARNING
All combustible materials and air contaminants
must be eliminated from the vicinity of the boiler
and piping intake and termination to prevent
the potential of severe personal injury, death, or
substantial property damage.
Combustible Materials:
Combustible materials, such as gasoline or any other
ammable vapors or liquids, cannot be stored near
the boiler. Remove immediately if found.
Air contaminants:
Products containing chlorine or uorine will cause
acidic condensate in the boiler if allowed to
contaminate the boiler intake air. This will cause
signicant damage to the boiler over time. Read the
list of potential materials listed in Table 1, page 5
of this manual. Remove immediately if found.
Check the Pressure and Temperature Gauge
Make sure the pressure reading on the P&T gauge
remains at least 5 psig less than the relief valve
setting. For example, if the relief valve is set for 30
psig, the P&T gauge must be 25 psig or lower. If
the pressure is too high, contact a qualied service
technician.
DIRECT EXHAUST Installations
In direct exhaust installations, combustion air is taken
from the inside. Air piping is not connected to the air
intake.
1. Visually inspect all combustion air openings.
a. Remove any debris or blockage from
combustion air louvers.
!
WARNING
Combustion air openings must remain
unobstructed to allow combustion and ventilation
air to be drawn into the boiler room. Failure to
provide proper combustion air can result in
severe personal injury, death, or substantial
property damage.
2. Verify that the boiler vent discharge is clean and
free of obstructions.
3. Remove any debris on the ue exhaust openings.
If removing any debris does not allow the boiler to
operate correctly afterwards, contact your qualied
service technician to inspect the boiler and the vent
and air systems.
DIRECT VENT Installations
In direct vent installations, combustion air is piped to
the boiler from the outside.
1. Verify that the boiler vent discharge and air intake
are clean and free of obstructions.
2. Remove any debris on the air intake or ue
exhaust openings.
If removing any debris does not allow the boiler to
operate correctly afterwards, contact your qualied
service technician to inspect the boiler and the vent
and air systems.
Maintenance Procedures — DAILY

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Maintenance Procedures — MONTHLY
IMPORTANT
In addition to the daily routine, perform the following
procedures on a monthly basis.
Check Vent Piping
Visually inspect the ue gas vent piping for any signs
of blockage, leakage or deterioration. Notify your
qualied service technician at once for repairs if you
nd any problems.
!
WARNING
Failure to inspect the vent system and have it
repaired as necessary can result in vent system
failure, causing severe personal injury or death.
Check Air Piping (Direct Vent Systems)
Visually inspect the air inlet to be sure it is
unobstructed. Inspect entire length of air piping to
ensure piping is intact and all joints are properly
sealed. Call your qualied service technician if you
notice any problems.
Check the Relief Valve
Inspect the boiler relief valve and the relief valve
discharge pipe for signs of weeping or leakage.
If the relief valve often weeps, the expansion tank
may not be working properly; Immediately contact
your qualied service technician to inspect the boiler
and system.
Check the Condensate Drain System
While the boiler is running, check the discharge
end of the condensate drain tubing by holding your
ngers in front of the opening.
If you notice ue gas escaping, this indicates a dry
condensate drain trap. See the following steps to ll
the trap.
If the condensate trap dries out on a regular basis,
call your qualied service technician to inspect the
boiler and condensate line and rell the condensate
trap.
!
WARNING
The condensate trap must be lled with water
during all times of boiler operation to avoid ue
gas emission from the condensate drain line.
Failure to ll the trap could result in severe
personal injury or death.
Under some circumstances,an SVF vent system
may not produce enough condensate to keep the
condensate trap full of liquid. If the trap is not full,
small amounts of ue products can be emitted into
the boiler room through the condensate drain line.
Follow the procedure below to ll the trap.
1. Fill the condensate trap with fresh water by
pouring water into the exhaust sampling port on
the ue connection (piping end of boiler).
a. Verify that the condensate assembly is
unobstructed by pouring until the water runs
out the end of the condensate drain line.
b. If the water does not run out, there is an
obstruction. Proceed to the next step.
2. To remove an obstruction, remove and ush the
trap and drain line.
a. Loosen any attachments to the supplied
exible drain hose.
b. Loosen the condensate trap inlet connection.
c. Remove and ush out the condensate trap and
drain line.
d. Reinstall the trap and drain line. Tighten all
attachments.
e. Pour water into the port and ensure that water
runs out the end of the drain line.
f. If the water still does not run out, call your
qualied service technician to inspect the
boiler and clean or replace the condensate
assembly.
(continued on the next page)

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Check Automatic Air Vents
Refer to the gures in this section for the instructions
below.
1. Remove the cap (A) from any automatic air vent
in the system.
2. Check operation by depressing the valve (B)
slightly with the tip of a screwdriver.
3. If the air vent valve appears to be working freely
and not leaking, replace the cap.
a. Twist the cap all the way on.
b. Loosen the cap one turn to allow vent to
operate.
4. If the vent does not operate correctly, have it
replaced.
Maintenance Procedures — MONTHLY, continued
220176
Figure 10 Automatic air vent cap and valve
Figure 11 SVF 725/850 automatic air vent location Figure 12 SVF 1000 automatic air vent location
220134
220062
Automatic Air Vent
Automatic Air Vent
A
B

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Maintenance Procedures — EVERY 3 MONTHS
IMPORTANT
In addition to the daily routine, perform the following
procedures every three months.
Test the Low Water Cuto󰀨
A push-to-test low water cuto󰀨 (LWCO) button is
factory installed on the switch panel on the left side of
the control tray. The LWCO probe is mounted on the
front of the heat exchanger.
Once the button is pushed, the boiler will shut
down. The LWCO is manually reset through the main
control. This can be performed through the control
display by selecting <Reset Lockout>.
!
WARNING
If the low water cuto fails to cause a manual
reset lockout condition, immediately turn o
all power to the boiler. If the LWCO fails, or
the service light is on, contact your service
technician right away.
Check the Time and Date
Check the time and date shown on the control
display. If the time or date is incorrect, correct it
through the control. Refer to page 10 for more
information.
Figure 13 Low water cuto󰀨 test button
(model 725/850 shown)
220175

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IMPORTANT
In addition to the daily routine, perform the following
procedures every six months.
Check the Water and Gas Piping
1. Perform gas leak inspection per steps 1 through 7
of the Operating Instructions, Figure 1, page 6.
• If gas odor or leak is detected, immediately
shut down the boiler following procedures in the
Operating Instructions (Figure 1, page 6). Call
a qualied service technician.
2. Visually inspect for leaks around internal water
piping. Also inspect external water piping,
circulators, relief valve and ttings. Immediately
call a qualied service technician to repair any
leaks.
!
WARNING
Have leaks xed at once by a qualied service
technician. Failure to comply could result in
severe personal injury, death or substantial
property damage.
Operate the Relief Valve
1. Before proceeding, verify that the relief valve
outlet has been piped to a safe place of
discharge, avoiding any possibility of scalding
from hot water.
!
WARNING
To avoid water damage or scalding due to
valve operation, a metal discharge line must be
connected to relief valve outlet and run to a safe
place of disposal. This discharge line must be
installed by a qualied heating installer or service
technician in accordance with the instructions in
the SVF Boiler Manual. The discharge line must
be terminated so as to eliminate the possibility
of severe burns or property damage should the
valve discharge.
2. Read the boiler pressure/temperature gauge to
make sure the system is pressurized.
3. Lift the relief valve top lever slightly, allowing
water to relieve through the valve and discharge
piping.
4. If water ows freely, release the lever and allow
the valve to seat.
a. Watch the end of the relief valve discharge
pipe to ensure that the valve does not weep
after the line has had time to drain.
b. If the valve weeps, lift the seat again to attempt
to clean the valve seat.
c. If the valve continues to weep afterwards,
contact your qualied service technician to
inspect the valve and system.
5. If water does not ow from the valve when you lift
the lever completely, the valve or discharge line
may be blocked.
a. Immediately shut down the boiler, following the
operating instructions on page 6.
b. Call your qualied service technician to inspect
the boiler and system.
Maintenance Procedures — EVERY 6 MONTHS
Figure 14 Relief Valve (model 725/850 shown)
220060
Relief V
alve,
installed

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To Continue Operation for DHW
If the boiler is to supply heat for domestic hot water
generation during the summer, no changes should be
needed.
1. Leave the boiler power on and allow the DHW
storage tank to call for heat as necessary.
2. Set back room thermostats to prevent any
unnecessary call for heat during the o󰀨 season.
To Leave the Boiler in Stand-By Mode
1. The SVF boiler’s control provides e󰀨ective
features for stand-by operation. These features
include periodic exercising of the boiler and
system circulators,and automatic operation of the
boiler at low re if water temperatures drop too
close to freezing. Congure the control as needed
to operate the necessary circulators.
2. Leave the boiler power on and allow the control to
monitor the boiler and system during the stand-by
period.
!
WARNING
The control must be congured to operate all
circulators needed to ensure the system and all
circuits will be protected against freezing. See the
SVF Advanced manual for details.
3. Set back room thermostats to prevent any
unnecessary call for heat during the o󰀨 season.
To Shut Down the Boiler
1. DO NOT shut down boilers used for domestic
water heating; these must operate year-round.
2. Follow “To Turn O󰀨Gas to the Appliance” of the
Operating Instructions, Figure 1, page 6.
3. DO NOT drain the system unless exposure to
freezing temperatures will occur.
4. DO NOT drain the system if it is lled with an
antifreeze solution, even if freezing temperatures
will occur.
Maintenance Procedures — END OF SEASON

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Notes

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Notes

Manual Part Number 550-100-291/1122
WM Technologies, LLC
500 Blaine Street
Michigan City, IN 46360-2388
T
elephone: [phone]
weil-mclain.com