Knight WH-056 Guide

100287990_2000545748_Rev B
User’s Information Manual
Models: 56 - 400
If the information in this manual is not followed exactly, a fire or
explosion may result causing property damage, personal injury or
loss of life.
This appliance MUST NOT be installed in any location where
gasoline or flammable vapors are likely to be present.
WHAT TO DO IF YOU SMELL GAS
• 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 near by phone.
Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
• Installation and service must be performed by a qualified
installer, service agency, or the gas supplier.
WARNING
Save this manual for future reference.

2
Hazard definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or
to important information concerning the life of the product.
DANGER
WARNING
CAUTION
CAUTION
NOTICE
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious
injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate
injury.
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in property damage.
NOTICE indicates special instructions on installation, operation, or maintenance that are important but not
related to personal injury or property damage.
Contents
HAZARD DEFINITIONS .................................................... 2
PLEASE READ BEFORE PROCEEDING ........................ 3
1. PREVENT COMBUSTION AIR CONTAMINATION..... 4
2. MAINTENANCE SCHEDULE....................................... 5
Maintenance Procedures................................................... 6
Boiler Must Be Serviced and Maintained .................... 6
Check Boiler Area......................................................... 6
Check Pressure Temperature Gauge........................... 6
Check Vent Piping........................................................ 6
Check Air Piping........................................................... 6
Check Relief Valve....................................................... 6
Check Condensate Drain System ............................. 6-7
Test Low Water Cutoff (if installed).............................. 8
Reset Button (low water cutoff).................................... 8
Check Boiler Piping (gas and water)............................ 8
Operate Relief Valve .................................................... 8
Shut Boiler Down.......................................................... 8
3. OPERATING INSTRUCTIONS................................ 9-10
4. SMART SYSTEM CONTROL MODULE
SMART SYSTEM Control Module................................... 11
Access Modes ............................................................ 11
Saving Parameters..................................................... 11
Adjusting Parameters ............................................ 11-12
Status Display Screens ......................................... 13-15
Revision Notes.................................................. Back Cover

Please read before proceeding
The Knight Wall Hung Fire Tube Boiler
Installation and Operation Manual along
with the Knight Wall Hung Fire Tube
Boiler Service Manual are for use only
by a qualified heating installer/service
technician. Refer only to this User’s
Information Manual for your reference.
Improper installation, adjustment,
alteration, service or maintenance can
cause property damage, personal injury
(exposure to hazardous materials) or loss
of life. Installation and service must be
performed by a qualified installer, service
agency or the gas supplier (who must
read and follow the supplied instruction
before installing, servicing, or removing
this boiler. This boiler contains materials
that have been identified as carcinogenic,
or possibly carcinogenic, to humans).
Failure to adhere to the guidelines on this
page can result in severe personal injury,
death, or substantial property damage.
Boiler service and maintenance –
• To avoid electric shock, disconnect electrical supply
before performing maintenance.
• To avoid severe burns, allow boiler to cool before
performing maintenance.
Boiler operation –
• Do not block flow of combustion or ventilation air to
the boiler. This boiler is equipped with a control which
will automatically shut down the boiler should air or
vent be blocked. If vent or air blockage is easily
accessible and removable, remove it. The boiler should
attempt to restart. If blockage is not obvious or cannot
be removed, have the boiler and system checked by a
qualified service technician.
• Should overheating occur or gas supply fail to shut off,
do not turn off or disconnect electrical supply to the
circulator. Instead, shut off the gas supply at a location
external to the appliance.
• Do not use this boiler if any part has been under water.
The possible damage to a flooded appliance can be
extensive and present numerous safety hazards. Any
appliance that has been under water must be replaced.
Boiler water –
• Thoroughly flush the system (without boiler
connected) to remove sediment. The high-efficiency
heat exchanger can be damaged by build-up or
corrosion due to sediment.
• Do not use petroleum-based cleaning or sealing
compounds in the boiler system. Gaskets and seals in
the system may be damaged. This can result in
substantial property damage.
• Do not use “homemade cures” or “boiler patent
medicines”. Serious damage to the boiler, personnel,
and/or property may result.
• Continual fresh make-up water will reduce boiler life.
Mineral buildup in the heat exchanger reduces heat
transfer, overheats the stainless steel heat exchanger,
and causes failure. Addition of oxygen carried in by
makeup water can cause internal corrosion. Leaks in
boiler or piping must be repaired at once to prevent
makeup water.
Freeze protection fluids –
• NEVER use automotive antifreeze. Use only inhibited
propylene glycol solutions, which are specifically
formulated for hydronic systems. Ethylene glycol is
toxic and can attack gaskets and seals used in hydronic
systems.
When calling or writing about the boiler
– Please have the boiler model and serial
number from the boiler rating plate.
Consider piping and installation when
determining boiler location.
Any claims for damage or shortage in
shipment must be filed immediately
against the transportation company by
the consignee.
Factory warranty (shipped with unit) does
not apply to units improperly installed or
improperly operated.
3
NOTICE
WARNING
NOTICE
WARNING DO NOT install units in rooms or
environments that contain corrosive
contaminants (see Table 1 on page 4).
Failure to comply could result in severe
personal injury, death, or substantial
property damage.
User’s Information Manual

1 Prevent combustion air contamination
4
If the boiler combustion air inlet is located
in a laundry room or pool facility, for
example, these areas will always contain
hazardous contaminants.
To prevent the potential of severe
personal injury or death, check for areas
and products listed in Table 1 before
installing the boiler or air inlet piping.
If contaminants are found, you MUST:
• Remove contaminants permanently.
—OR—
• Relocate air inlet and vent
terminations to other areas.
WARNING
WARNING
Products to avoid:
Spray cans containing chloro/fluorocarbons
Permanent wave solutions
Chlorinated waxes/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/muriatic acid
Cements and glues
Antistatic fabric softeners used in clothes dryers
Chlorine-type bleaches, detergents, and cleaning solvents
found in household laundry rooms
Adhesives used to fasten building products and other similar
products
Areas likely to have contaminants
Dry cleaning/laundry areas and establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture refinishing areas and establishments
New building construction
Remodeling areas
Garages with workshops
Table 1 Corrosive Contaminants and Sources
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 re-piped
and terminated to another location.
Contaminated combustion air will damage
the boiler, resulting in possible severe
personal injury, death, or substantial
property damage.
Pool and laundry products and common household
and hobby products often contain fluorine or chlorine
compounds. When these chemicals pass through the boiler,
they can form strong acids. The acid can eat through the
boiler wall, causing serious damage and presenting a possible
threat of flue gas spillage or boiler water leakage into the
building.
Please read the information listed in Table 1. 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 Knight
Wall Hung Fire Tube Boiler Installation and Operation
Manual.
User’s Information Manual

2 Maintenance schedule
5
Service technician
(see the Knight Wall Hung Fire Tube Boiler Service
Manual)
General:
• Reported problems
• Inspect interior; clean and vacuum if
necessary
• Clean condensate trap and fill with fresh
water
•Check for leaks (water, gas, flue,
condensate)
• Verify flue and air lines in good condition
and sealed tight
•Check system water pressure/system
piping/expansion tank
• Check fill water meter
• Test boiler water. When test indicates,
clean system water with approved
system restorer following manufacturer’s
information
• Check control settings
•Ignition and flame sense electrodes
(sand off any deposits; clean and
reposition)
• Wiring and connections
•Perform start-up checkout and performance
verificationperSection10 in the Knight Fire
Tube Installation and Operation Manual.
• Flame inspection (stable, uniform)
• Flame signal (at least 4 mA)
•Clean the heat exchanger if flue
temperature is more than 54°F above
return water temperature.
If combustion or performance indicate
need:
• Clean heat exchanger
•Remove and clean burner using
compressed air only
• Clean the blower wheel
Owner maintenance
(see pages 6 - 8 for detailed instructions)
Daily • Check boiler area
•Check pressure/temperature
gauge
Monthly
• Check vent piping
• Check air piping
• Check air and vent termination
screens
• Check relief valve
• Check condensate drain system
Periodically • Test low water cutoff (if used)
• Reset button (low water cutoff)
Every
6 months
•Check boiler piping (gas and
water) for leaks
• Operate relief valve
End
of season
months
•Shut boiler down (unless boiler
used for domestic hot water)
WARNING Follow the maintenance procedures given throughout this manual. Failure to perform the service and
maintenance or follow the directions in this manual could result in damage to the boiler or system, resulting in
severe personal injury, death, or substantial property damage.
ANNUAL START-UP
User’s Information Manual

2 Maintenance schedule
6
Maintenance procedures
Boiler must be serviced and maintained
WARNING The boiler must be inspected and started
annually at the beginning of the heating
season by a qualified service technician.
In addition, the maintenance and care
of the boiler designated on page 5 of this
manual and explained on pages 6 through
8 must be performed to assure maximum
boiler efficiency and reliability. Failure to
service and maintain the boiler and system
could result in equipment failure, causing
possible severe personal injury, death, or
substantial property damage.
NOTICE The following information provides
detailed instructions for completing
the maintenance items listed in the
maintenance schedule on page 5. In
addition to this maintenance, the boiler
must be serviced and started up at the
beginning of each heating season by a
qualified service technician.
Check boiler area
WARNING To prevent potential of severe personal
injury, death, or substantial property
damage, eliminate all materials discussed
below from the boiler vicinity and the
vicinity of the boiler combustion air inlet.
If contaminants are found:
Remove products immediately from the
area. If they have been there for an
extended period, call a qualified service
technician to inspect the boiler for possible
damage from acid corrosion.
If products cannot be removed,
immediately call a qualified service
technician to re-pipe vent and air piping
and locate vent termination/air intake
away from contaminated areas.
1. Combustible/flammable materials -- Do not store
combustible materials, gasoline or any other flammable
vapors or liquids near the boiler. Remove immediately if
found.
2. Air contaminants -- Products containing chlorine or
fluorine, if allowed to contaminate the boiler intake air,
will cause acidic condensate in the boiler. This will cause
significant damage to the boiler if allowed to continue.
Read the list of potential materials listed in Table 1 on
page 4 of this manual. If any of these products are in the
room from which the boiler takes its combustion air, they
must be removed immediately or the boiler combustion
air (and vent termination) must be relocated to another
area.
Check pressure/temperature gauge
1. Make sure the pressure reading on the boiler pressure/
temperature gauge does not exceed 24 psi. Higher
pressure may indicate a problem with the expansion
tank.
2. Contact a qualified service technician if problem persists.
Check vent piping
1. Visually inspect the flue gas vent piping for any signs of
blockage, leakage, or deterioration of the piping. Notify
your qualified service technician at once if you find any
problems.
WARNING Failure to inspect the vent system as noted
above and have it repaired by a qualified
service technician can result in vent system
failure, causing severe personal injury or
death.
Check air piping
1. Visually inspect the air inlet termination to be sure it is
unobstructed. Inspect the entire length of air piping to
ensure piping is intact and all joints are properly sealed.
2. Call your qualified service technician if you notice any
problems.
Check relief valve
1. Inspect the boiler relief valve and the relief valve
discharge pipe for signs of weeping or leakage.
2. If the relief valve often weeps, the expansion tank may
not be working properly. Immediately contact your
qualified service technician to inspect the boiler and
system.
Check condensate drain system
Inspect/check condensate lines and fittings
1. Inspect the condensate drain line, condensate PVC
fittings and condensate trap (FIG. 2-1).
User’s Information Manual

2 Maintenance schedule (continued)
7
Figure 2-1 Condensate Trap
Figure 2-2 Condensate Disposal
User’s Information Manual
Condensate drain
1. This boiler is a high efficiency appliance that produces
condensate.
2. The bottom of the boiler has a 1 1/4 inch pipe for
connection of the condensate trap (FIG. 2-2).
3. The provided condensate trap is equipped with a ball
that acts as a seal against harmful flue gases escaping
in case there is no condensate in the trap. If this ball is
not present, flue gases may be able to pass through the
trap when there is no condensate present, resulting in
an unsafe environment. It is important to check and
make sure the ball is located in the trap, acting as a seal
against flue gases.
4. Fill condensate trap with enough water to make the
ball float (FIG. 2-1).
5. Loosen compression fitting (FIG. 2-1).
6. Slide the condensate trap onto the condensate drain
at the bottom of the unit. As the trap is pressed on, a
stainless steel retaining ring will engage the drain pipe
allowing the trap to be pushed on, but not pulled off.
7. Tighten compression fitting.
8. Slope condensate tubing down and away from the
boiler into a drain or condensate neutralizing filter.
Condensate from the Knight Wall Hung Fire Tube
boiler will be slightly acidic (typically with a pH from
3 to 5). Install a neutralizing filter if required by local
codes.
A Neutralizer Kit is available from the factory.
9. Do not expose condensate line to freezing
temperatures.
10. Use only plastic tubing or piping as a condensate
drain line (FIG. 2-2).
CONDENSATE
DRAIN
REMOVABLE CAP TO
CLEAN OUT TRAP
COMPRESSION
FITTING
FLOAT BALL
IMG00209
GASKET
RETAINING
RING
11. A condensate removal pump is required if the boiler is
below the drain. When installing a condensate pump,
select one approved for use with condensing boilers and
furnaces. The pump should have an overflow switch to
prevent property damage from condensate spillage. The
switch should be wired in series with the air pressure
switch inside the boiler.
Use materials approved by the authority
having jurisdiction. In the absence of other
authority, PVC and CPVC pipe must comply
with ASTM D1785 or D2845. Cement and
primer must comply with ASME D2564 or
F493. For Canada use CSA or ULC certified
PVC or CPVC pipe, fittings, and cement.
NOTICE
NOTICE To allow for proper drainage on large
horizontal runs, a second line vent may
be required and tubing size may need to
increase to 1 inch.
The condensate line must remain
unobstructed, allowing free flow of
condensate. If condensate is allowed to
freeze in the line or if the line is obstructed in
any other manner, condensate can exit from
the condensate trap vent opening, resulting
in potential water damage to property.
The stainless steel retaining ring must be
installed between the rubber sealing gasket
and the compression fitting (FIG. 2-1). The
compression fitting must be tightened.
The condensate trap must have the float ball
(FIG. 2-1) in place during all times of boiler
operation to avoid flue gas emission from
the condensate drain line. Failure to ensure
the float ball is in place could result in severe
personal injury or death.
WARNING
DIR #2000543292 00
CONDENSATE DRAIN CONNECTION -
ROUTE TO FLOOR DRAIN OR
NEUTRALIZING FILTER USING
3/4” PVC TUBING
CONDENSATE TRAP
REMOVABLE CAP
FOR CLEANING
TRAP

2 Maintenance schedule
8
WARNING Have leaks fixed at once by a qualified
service technician. Failure to comply
could result in severe personal injury,
death, or substantial property damage.
Operate 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 the relief
valve outlet and run to a safe place of
disposal. This discharge line must be
installed by a qualified heating installer or
service technician in accordance with the
instructions in the Knight Wall Hung Fire
Tube Boiler Installation and Operation
Manual. The discharge line must be
terminated so as to eliminate 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. Lift the relief valve
top lever slightly, allowing water to relieve through
the valve and discharge piping.
3. If water flows freely, release the lever and allow the valve
to seat. 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. If the valve weeps, lift the seat again to
attempt to clean the valve seat. If the valve continues to
weep afterwards, contact your qualified service
technician to inspect the valve and system.
4. If water does not flow from the valve when you lift the
lever completely, the valve or discharge line may be
blocked. Immediately shut down the boiler, following
the operating instructions on page 9 of this manual. Call
yourqualifiedservicetechniciantoinspecttheboilerand
system.
Shut boiler down (unless boiler is used
for Domestic Water)
1. Follow “To Turn Off Gas to Appliance” on page 9 of this
manual.
2. Do not drain the system unless exposure to freezing
temperatures will occur.
3. Do not drain the system if it is filled with an antifreeze
solution.
4. DO NOT shut down boilers used for domestic water
heating, they must operate year-round.
3. Replace the front access door.
Test low water cutoff (if installed)
1. If the system is equipped with a low water cutoff,
test the low water cutoff periodically during the heating
season, following the low water cutoff manufacturer’s
instructions.
Reset button (low water cutoff)
1. Testingthelow water cutoff shuts the unit off. Press the
RESET button on the low water cutoff to turn the unit
back on.
Check boiler piping (gas and water)
1. Remove the boiler front access door and perform a gas
leak inspection per steps 1 through 7 of the Operating
Instructions on page 9. If gas odor or leak is detected,
immediately shut down the boiler following the
procedures on page 9. Call a qualified service
technician.
2. Visually inspect for leaks around water piping.
Also inspect the circulators, relief valve, and fittings.
Immediatelycall a qualifiedservice technician torepair
any leaks.
User’s Information Manual

9
3 Operating instructions
User’s Information Manual
Figure 3-1 Operating Instructions_ Models WH56 - WH286

10
User’s Information Manual
Figure 3-2 Operating Instructions_ Model WH400
3 Operating instructions

Figure 4-1 Control Panel
Knight Wall Hung Fire Tube Boiler control module
Use the control panel (FIG. 4-1) to set temperatures, operating conditions, and monitor boiler operation.
4 SMART SYSTEM control module
11
The information on the bottom of the display shows the
functions of the two SELECT keys (on either corner), and
the NAVIGATION dial (in the center):
MENU = Left SELECT Key
SETPOINTS = NAVIGATION Dial - Pressing Down
SHDN = Right SELECT Key
Access modes
User
The user can adjust space heating and tank target
temperatures by pressing the NAVIGATION dial when
“SETPOINTS” is flashing at the bottom of the display.
The date and time, and the temperature units can also be
changed (see page 11).
Installer
Most parameters are available only to the installer,
accessible by entering the installer password, see the Knight
Wall Hung Fire Tube Boiler Service Manual.
Saving parameters (reference the Parameter Table
in the Knight Wall Hung Fire Tube Boiler Service Manual)
Please note that the brackets ([]) denote
screen status.
NOTICE
To enter a parameter and continue programming:
Press the RIGHT SELECT [SAVE] key 1 time to return to the
parameter listings; press again to return to the menu listings.
Remember to press the RIGHT SELECT [HOME] key when
finished programming in order to save the changes made.
See the Knight Wall Hung Fire Tube Boiler Service Manual for
a detailed description of parameters and access modes.
User’s Information Manual
DIR #2000544469 00
To save parameters and exit programming:
Press the RIGHT SELECT [SAVE] key and then press the
RIGHT SELECT [HOME] key.
Set space heating operation
Determine controlling sensor
For space heating systems, the temperature control can be
based on one of three sensors; the inlet, outlet, or system supply
sensor. The SMART SYSTEM control is programmed at the
factory to control the temperature of the outlet sensor. The
control will automatically switch to the system supply sensor
once it is connected. If it is desired to base the temperature
control on the inlet sensor, the appropriate parameter must
be changed in the control. See the Knight Wall Hung Fire
Tube Boiler Service Manual for a detailed explanation of this
procedure.

12
4 SMART SYSTEM control module (continued)
Verify space heat circulator mode
The Space Heating Mode controls both the system pump
(if connected), and the boiler pump. When the SMART
SYSTEM control receives a space heating call for heat, it
turns on the system pump. If the boiler is not heating an
indirect DHW (Domestic Hot Water) tank, and the set
point is not met, it also turns on the boiler pump. After the
space heating call for heat ends, the system pump continues
to run for a short period of time. The system pump can be
programmed to run continuously, except during outdoor
shutdown. If the boiler pump was running, it continues to
run for a short period of time as well. These pump delays are
factory set to 30 seconds. If different delays are desired, the
appropriate parameters in the control must be changed. See
the Knight Wall Hung Fire Tube Boiler Service Manual for a
detailed explanation of this procedure.
Adjust set point temperature(s)
Please note that the brackets ([]) denote
screen status.
NOTICE
The NAVIGATION dial may be used during normal
operation to adjust the space heating and tank set point
temperatures.
1. From the Status Screen press the NAVIGATION dial.
2. Turn the NAVIGATION dial counterclockwise to select
the appropriate set point.
3. Press the NAVIGATION dial to adjust the temperature.
4. Once the desired temperature is displayed, press the
RIGHT SELECT [SAVE] key.
5. If necessary repeat Steps 3 and 4 to make adjustments to
additional set points.
6. Press the RIGHT SELECT [HOME[ key to upload the
changes.
7. If the RIGHT SELECT [SAVE] key is not pressed, the
new settings will be discarded.
Set DHW boiler target temperature
When in the DHW Mode, the control will modulate to
maintain the boiler outlet temperature or system supply
temperature to a set point. This set point is set at the factory
to 180°F. If a different set point is desired, the appropriate
parameter in the control must be changed. See the Knight
Wall Hung Fire Tube Boiler Service Manual for a detailed
explanation of this procedure.
Set maximum DHW fan speed
If the rated input of the indirect tank is less than the maximum
output of the boiler, change the maximum DHW fan speed
setting to limit the boiler output accordingly, see the Knight
Wall Hung Fire Tube Boiler Service Manual for a detailed
explanation of this procedure.
The SMART SYSTEM control has a built-in clock that it uses
for its night setback feature and for logging events. This clock
must be set when the boiler is installed, and anytime the boiler
has been powered off for more than 4 hours. Use the following
procedure to set the clock:
1. Press and hold the LEFT SELECT [MENU] key for at
least 5 seconds.
2. The display changes to read [PASSWORD],
with four (4) zeros below it.
3. Press the RIGHT SELECT [SAVE] key.
4. The display will then show a menu with the time and
date and temperature unit.
5. Press the NAVIGATION dial twice.
6. Turn the NAVIGATION dial to adjust the hours. Press
the NAVIGATION dial.
7. Turn the NAVIGATION dial to adjust the minutes. Press
the NAVIGATION dial.
8. TurntheNAVIGATION dial to adjust the month. Pressthe
NAVIGATION dial.
9. Turn the NAVIGATION dial to adjust the date. Press the
NAVIGATION dial.
10. Turn the NAVIGATION dial to adjust the year. Press the
RIGHT SELECT [SAVE] key.
11. Press the RIGHT SELECT [HOME] key.
Please note that the brackets ([]) denote
screen status.
NOTICE
Set clock
User’s Information Manual
Set domestic hot water (DHW) operation
Verify DHW mode
There are two (2) modes of operation for DHW. In Normal
Mode, when a DHW demand begins, the control will start
the DHW pump, turn off the boiler pump (if running), and
modulate to bring the outlet temperature to the DHW boiler
set point. The maximum firing rate may be limited in this
mode if desired.
In Zone Mode it is assumed that the indirect DHW tank is
piped as a zone on the primary loop. When a DHW demand
begins, the control will turn on the DHW pump output, and
raise the system temperature set point to the DHW boiler set
point (if higher). The boiler pump will be turned on. The
system pump may be forced on, forced off, or not changed,
depending on the System Pump Mode selected (reference
the Knight Wall Hung Fire Tube Service Manual for details).
In this mode, any low temperature zones (such as radiant
heating) may need additional controls to limit the water
temperature sent to those zones.
The internal clock does not adjust for
Daylight Savings Time and therefore, will
require a manual adjustment.
NOTICE
The clock is automatically updated whenever a PC is connected
and the Win Pro-Installer program is started.

13
Figure 4-2 Status Display Screen
4 SMART SYSTEM control module
User’s Information Manual
Status Display Screens
NOTE: All screens show burner status, heat demands, lockout/blocking, pump status, and soft keys.
Section Display Description
A
(Boiler Status
Bar)
STANDBY The unit has not received a call for heat from a remote thermostat
nor has it received a call for heat from a DHW thermostat.
START The unit has begun a burn cycle and is checking all safety circuits.
PREPURGE The unit has initiated a prepurge period on a call for heat.
IGNITION The unit has begun a spark period to ignite the main burner.
The unit has fired and is running at the displayed percentage.
POSTPURGE
The call for heat has been satisfied and the unit runs the fan for an
additional postpurge period to clear the combustion chamber and
vent system of residual flue products.
SHUTDOWN The unit has been placed in the OFF position.
SETPOINT MET The controlled temperature has exceeded its set point and its offset.
BLOCKED The unit has detected a condition that has temporarily interrupted
the current call for heat.
B
(Call for Heat
Indicators)
Room Thermostat 1 has a call for heat.
Room Thermostat 2 has a call for heat.
Room Thermostat 3 has a call for heat.
The tank thermostat or sensor has a call for heat.
Indicates which room thermostat demand has priority.
The unit is being controlled by a 0 - 10V BMS signal.
The member unit is supplying heat while in Cascade Mode.
A
C
D
B
F
E
(BOILER
STATUS)
(OPERATIONAL
INFORMATION)
(LEFT SELECT
KEY)
(RIGHT SELECT KEY)
(NAVIGATION DIAL)
(CALL FOR
HEAT)
%

4 SMART SYSTEM control module
14
User’s Information Manual
Status Display Screens (cont’d)
NOTE: All screens show burner status, heat demands, lockout/blocking, pump status, and soft keys.
Section Display Description
C
(Operational
Information)
DETAILS SCREEN 1
a. SYSTEM TEMP
b. TANK TEMP
c. OUTDOOR TEMP
d. INLET TEMP
e. OUTLET TEMP
f. DHW RECIRC TEMP - The temperature read by the DHW
recirculation sensor (if connected).
DETAILS SCREEN 2
a. DELTA T
b. FLUE TEMP
c. FLAME CURRENT
d. FAN SPEED
e. LOOP 1 TEMP - The temperature of Loop 1 reported by the
MTLC control.
f. LOOP 2 TEMP - The temperature of Loop 2 reported by the
MTLC control.
g. LOOP 3 TEMP - The temperature of Loop 3 reported by the
MTLC control.
I/O SCREEN
a. GAS PRESS SW - The state of the gas pressure switch.
b. FLOW SW - The state of the flow switch.
c. LOUVER RELAY - The state of the louver relay output.
d. LOUVER SW - The state of the louver proving switch.
e. BLOCKED DRAIN - The state of the blocked drain switch.
f. GAS VALVE - The state of the gas valve output.
BMS SCREEN
a. 0 - 10V BMS IN
b. 0 - 10V RATE OUT
c. BMS ADDRESS
d. BMS CONTROL?
e. SYS PUMP SPEED
f. BLR PUMP OUT
HISTORY SCREEN
a. SH RUN TIME - Total time running for Space Heat (SH).
b. SH CYCLES - Total Space Heat (SH) demand cycles.
c. DHW RUN TIME - Total time running for DHW.
d. DHW CYCLES - Total DHW demand cycles.
e. POWER TIME - Total time powered ON.
f. IGNITIONS - Total number of successful ignitions.
g. IGN ATTEMPTS - Total number of ignition attempts.
LAST 10 FAULTS
a. FAULT NO.
b. FAULT
c. DATE
d. TIME

15
4 SMART SYSTEM control module (continued)
User’s Information Manual
Status Display Screens (cont’d)
NOTE: All screens show burner status, heat demands, lockout/blocking, pump status, and soft keys.
Section Display Description
C
(Operational
Information
cont.)
CASCADE STATUS
a. CASCADE STATUS
b. CASCADE POWER
c. PRESENT
NIGHT SETBACK
a. TRIGGER 1 - Next Space Heat (SH) night setback trigger.
b. TRIGGER 2 - Next DHW night setback trigger.
D
(LEFT SELECT
key function)
MENU Press and hold the LEFT SELECT key for five (5) seconds to access
the Parameter Settings Menu.
HOME Press the LEFT SELECT key to go back to the Home Status Screen
and upload any changes.
EXIT Press the LEFT SELECT key to go back to the previous Menu Screen.
YES Press the LEFT SELECT key to accept current operation.
SKIP Press the LEFT SELECT key to skip / un-enable the current selected
setback trigger.
LIMITS Press the LEFT SELECT key to access the High Limit Settings Menu.
E
(NAVIGATION
dial function)
MODIFY Pressing the NAVIGATION dial will allow the installer to change
the text.
F
(RIGHT SELECT
key function)
SHDN Press the RIGHT SELECT key to turn the boiler OFF.
ON Press the RIGHT SELECT key to turn the boiler ON.
NO Press the RIGHT SELECT key to cancel the shutdown operation.
SAVE Press the RIGHT SELECT key to save the current change.
HOME Press the RIGHT SELECT key to return to the Status Screen and
upload parameter changes.

Revision Notes: Revision A (Process #3000008912_Change
#500009028) initial release.
Revision B (PCP #3000010423 / CN #500010150) reflects an update to
the neutralizer information on page 7.
MM #100287990_DIR #2000545748_Rev B
08/17