LAARS SMW-250 User Manual
Installation, Operating and Maintenance Instructions Document 1163D
Installation,
Operation and
Maintenance
Instructions for
SUMMIT
Condensing Modulating Boiler
Models SMB-200, SMB-250
Condensing Modulating Water Heater
Models SMW-200, SMW-250
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in hot water boiler and heater installation and maintenance. Improper installation and/or
operation could create carbon monoxide gas in flue gases which could cause serious injury, property
damage, or death. Improper installation and/or operation will void the warranty.
If the information in this manual is not followed
WARNING
exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable
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 phone in your building.
• Immediately call your gas supplier from a nearby
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 gas supplier.
To the Installer: After installation these instructions must
be given to the homeowner or left on or near the appliance.
To the User: This booklet contains important information
that will help you in maintaining and operating this heater.
Please retain it for future reference.
Assurez-vous de bien suivres les instructions
données dans cette notice pour réduire au
minimum le risque d’incendie ou d’explosion ou
pour éviter tout dommage matériel, toute blessure
ou la mort.
Ne pas entreposer ni utiliser d’essence ni d’autres
vapeurs ou liquides inflammables dans le voisinage
de cet appareil ou de tout autre appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
• Ne pas tenter d’allumer d’appareils.
• Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones dansle bâtiment où vous
vous trouvez.
• Appelez immédiatement votre fournisseur de gaz
depuis un voisin. Suivez les instructions du
fournisseur.
• Si vous ne pouvez rejoindre le fournisseur de
gaz, appelez le sservice des incendies.
L’installation et l’entretien doivent être assurés par un
installateur ou un service d’entretien qualifié ou par le
fournisseur de gaz.
À l’installateur : Après l’installation, ces instructions
doivent être remises au propriétaire de la maison ou
demeurer près de l’appareil.
AVERTISSEMENT
H2212100D
Page 2
Table of Contents
SECTION 1.
General Information
1.1 Introduction ................................................... 3
1.2 Warranty ....................................................... 4
1.3 Materials Installer Must Provide .................... 4
1.4 Unpacking..................................................... 4
1.5 Locating the SUMMIT Appliance ................... 4
1.6 Locating Appliance for Correct
Vent Distance from Outside Wall or
Roof Termination .......................................... 5
1.7 Locating Appliance for Proper Vent Height.... 5
1.8 Locating Appliance with Respect
to Ventilation ................................................. 5
1.9 Locating SUMMIT Water Heater with
Respect to StorageTank(s) ........................... 5
1.10 Locating SUMMIT Boiler with Respect to
Supply/Return Header .................................. 5
SECTION 2.
Ventilation
2.1 Locating Vent Openings on Outside Wall...... 6
2.1.1 Exhaust Terminal Location ............................ 6
2.1.2 Intake Terminal Location ............................... 6
2.2 Installing Vent Piping / Terminals .................. 6
SECTION 3.
Gas Connections
3.1 Gas Supply and Piping ................................. 7
SECTION 4A.
Water Connections
SMB-200/250 Boiler
4A.1 Heating System Piping:
Hot Supply Connections ............................... 8
4A.2 Return Connections .................................... 10
4A.3 Cold Water Makeup .................................... 10
SECTION 4B.
Water Connections
SMW-200/250 Water Heater
4B.1 Water System Piping, Fittings
and Accessories ......................................... 10
4B.2 Combined Water (potable) Heating and
Space Heating (SMW-200/250 Only) .......... 13
SECTION 4C.
Condensate Drain Connection
................................................................... 13
SECTION 5.
Electrical Connections
5.1 Main Power................................................. 14
5.2 Temperature Control – SMB-200/250 ......... 15
5.3 Temperature Control – SMW-200/250 ........ 15
5.3.1 Water Heater Temperature Control ............. 15
5.3.2 Tank Temperature Control .......................... 15
5.4 Wiring Diagram........................................... 15
LAARS Heating Systems
SECTION 6.
Operating Instructions
Warning Label ............................................ 18
6.1 Anti-Freeze ................................................. 19
6.1.1 Summit Boiler Low Temperature Feature.... 19
6.1.2 Anti-Freeze Boiler Additives ........................ 19
6.2 Anti-Freeze SMW-200/250 Water Heater ... 19
6.3 Filling the System ....................................... 19
6.4 Operating the Burner and Set Up................ 20
6.5 Mode and On/Off Buttons Operation........... 21
6.6 Common Vent Test ..................................... 21
SECTION 7.
Maintenance
7.1 System Maintenance .................................. 22
7.2 Appliance Maintenance and
Component Description .............................. 23
7.2.1 Appliance Pump ......................................... 23
7.2.2 Gas Valve ................................................... 23
7.2.2.1 Offset and Throttle Adjustment ................... 23
7.2.3 Safety Limit Switch ..................................... 24
7.2.4 Appliance Control, Printed Circuit
Board (PCB ................................................ 24
7.2.5 Ignitor / Flame Sensor Assembly ................ 24
7.2.6 Transformer ................................................ 24
7.2.7 Blower ........................................................ 24
7.2.8 Mixing Valve................................................ 24
7.2.9 Cleaning the Primary Heat Exchanger Coil . 25
7.2.10 Burner......................................................... 25
7.2.11 Vent Terminals ............................................ 25
7.2.12 Condensate Collection System –
Inspection and Cleaning ............................. 25
7.2.13 Routine Deliming Procedure –
SMW-200/250............................................. 25
SECTION 8.
Trouble Shooting
8.1 Sequence of Operation ............................... 26
8.2 Trouble Shooting Fault Codes .................... 26
8.3 Fault Code Identification ............................. 26
8.4 Fault Correction .......................................... 26
8.5 Resolving Lockouts (LO) ............................ 27
8.6 Delayed Ignition – Possible Causes ............ 27
8.6.1 High Lock Up Pressure ............................... 27
8.6.2 Gas Valve Regulation ................................. 32
8.6.3 Defective Burner ......................................... 32
8.7 Short Cycling (SMB-200/250 ...................... 32
8.8 Short Cycling (SMW-200/250 ..................... 32
8.9 High Gas Consumption............................... 32
Power Up Fault Tree................................... 28
System Temperatures Fault Tree................ 29
Water/Space Heating Fault Tree ................. 30
Ignition Fault Tree ....................................... 31
SECTION 9.
Replacement Parts
9.1 Parts List .................................................... 32
SUMMIT BOILER OR WATER HEATER
Page 3
SECTION 1.
General Information
USING THIS MANUAL – Because the
SUMMIT SMB-200/250 Boilers and SMW-200/250
Water Heaters are identical appliances, with the
exception of materials of manufacture, labels and
ultimate use application, this manual provides
information for the proper installation, operation
and maintenance of both products. Where
differences exist between the application of the
appliances and their operation, the sections
pertinent to only one appliance or the other will be
so identified.
WARNING
The SUMMIT hydronic, condensing, boiler or water
heater must be installed in accordance with the
procedures detailed in this manual, or the Laars
Heating Systems warranty will be voided. The
installation must conform to the requirements of the
local jurisdiction having authority, and, in the United
States, to the latest edition of the National Fuel Gas
Code, ANSI Z223.1. In Canada, the installation must
conform to the latest edition of CAN/CGA-B149.1
Natural Gas Installation Code or CAN/CGA-B149.2
Propane Gas Installation Code, and/or local codes.
Any modifications to the boiler, its gas controls, or
wiring may void the warranty. If field conditions
require modifications, consult the factory
representative before initiating such modifications.
1.1 Introduction
This manual provides information necessary for
the installation, operation, and maintenance of Laars
Heating Systems SUMMIT copper tube, condensing,
appliances. Read it carefully before installation.
All application and installation procedures
should be reviewed completely before proceeding
with the installation. Consult the Laars Heating
Systems factory, or local factory representative, with
any problems or questions regarding this equipment.
Experience has shown that most operating problems
are caused by improper installation.
Direct vent-sealed combustion:
The SUMMIT appliance does not and should not
get combustion air from inside the building. All
combustion air is drawn in from outdoors through a 3inch or 4-inch diameter plastic pipe. PVC, ABS or
CPVC pipe is used for air intake. EXHAUST
VENTING may only be done in CPVC or AL29-4C
Stainless Steel Venting Systems that comply with
UL Standard 1738.
No chimney....flue....or draft inducer required.
Because this is a sealed combustion, forced draft
appliance, it does not require, and must not be
connected to a chimney, existing venting system, or
draft inducer.
Caution
Connection of this vent to a chimney, existing
venting system, or draft inducer will result in poor
and possibly dangerous operation.
The supplied vent terminations are designed to
be installed through the nearest outside wall.
The SUMMIT appliance is protected against
over pressurization. A pressure relief valve is fitted to
all appliances. It is installed in the dedicated fitting on
the top of the appliance.
IMPORTANT: The inlet gas pressure to the
appliance must not exceed 13" WC.
A high quality circulator is built into the
SUMMIT appliance and will provide sufficient head
pressure and volume to circulate water to the heating
system or storage tank(s) (see Table 3).
All installations must be made in accordance
with the 1). American National Standard Z223.1Latest Edition “National Fuel Gas Code” or 2). CAN/
CGA 1-B149 “Installation Codes for Gas Burning
Appliances and Equipment” and with the requirement
of the local utility or other authorities having
jurisdiction. Such applicable requirements take
precedence over the general instructions contained
herein.
All electrical wiring is to be done in accordance
with the local codes, or in the absence of local codes,
with: 1). The National Electrical Code ANSI/NFPA
No. 70-latest Edition, or 2). CSA STD. C22.1
“Canadian Electrical Code - Part 1”. This appliance
must be electrically grounded in accordance with
these codes.
Figure 1. Assembly View of the Unit.
Page 4
LAARS Heating Systems
1.2 Warranty
Laars Heating Systems SUMMIT appliances are
covered by a limited warranty. The owner should fill
out the warranty registration card and return it to
Laars Heating Systems.
All warranty claims must be made to an
authorized Laars Heating Systems representative or
directly to the factory. Claims must include the serial
number and model (this information can be found on
the rating plate), installation date, and name of the
installer. Shipping costs are not included in the
warranty coverage.
Some accessory items are shipped in separate
packages. Verify receipt of all packages listed on the
packing slip. Inspect everything for damage
immediately upon delivery, and advise the carrier of
any shortages or damage. Any such claims should be
filed with the carrier. The carrier, not the shipper, is
responsible for shortages and damage to the shipment
whether visible or concealed.
1.3 Materials Installer Must Provide
1. Total combined feet allowed for intake and
exhaust vent pipe per instructions. The following
charts show acceptable materials for intake and
exhaust pipes:
The solvent cement for pipe joints must comply with
the following standards:
i. PVC pipe D2564 / ABS pipe D2235, or
CPVC pipe F493
ii. CSA listed solvent cement for the PVC,
ABS or CPVC pipe used.
2. Electrical connection to a 120VAC/15Amp service.
3. Gas connection that will provide 250 cubic feet/
hour at 4 to 13 inch w.c.
4. Condensate drainage: a floor drain is preferred,
and a condensate pump can be used if required.
Check local codes for information about proper
disposal of condensate in your area.
5. Miscellaneous copper fittings and bronze valves
will be required to complete the piping system.
Use only plastic fittings (except Nylon®) for
condensate drain lines.
1.4 Unpacking
The SUMMIT appliance is shipped in a single
crate with the following standard components on top
of the appliance.
1. Exhaust terminal 4. Hubless couplings (2)
2. Intake terminal 5. Terminal Screens, 4” (2)
3. Backing plates (4)
Acceptable Intake Pipe Material
Model 200 Model 250
3-inch or 4-inch PVC 3-inch or 4-inch PVC
schedule 40 pipe per schedule 40 pipe per
ASTM D-1785 std. ASTM D-1785 std.
3-inch or 4-inch PVC DWV 3-inch or 4-inch PVC DWV
pipe per ASTM D-2665 std. pipe per ASTM D-2665 std.
3-inch or 4-inch ABS-DWV 3-inch or 4-inch ABS-DWV
pipe per ASTM D2661 std. pipe per ASTM D2661 std.
or ASTM F-628 std. or ASTM F-628 std.
3-inch or 4-inch CPVC 3-inch or 4-inch CPVC
schedule 40 or 80 pipe per schedule 40 or 80 pipe per
ASTM F441 std. ASTM F441 std.
3-inch or 4-inch AL29-4C 3-inch or 4-inch AL29-4C
stainless steel complying stainless steel complying
with UL Std. 1738 with UL Std. 1738
Acceptable Exhaust Vent Material
Model 200 Model 250
3-inch or 4-inch PVC 3-inch or 4-inch CPVC
schedule 40 pipe per schedule 40 or 80 pipe per
ASTM D-1785 std. ASTM F441 std.
3-inch or 4-inch PVC DWV 3-inch or 4-inch AL29-4C
pipe per ASTM D-2665 std. stainless steel complying
with UL Std. 1738
3-inch or 4-inch ABS-DWV
pipe per ASTM D2661 std.
or ASTM F-628 std.
3-inch or 4-inch CPVC
schedule 40 or 80 ipe per
ASTM F441 std.
3-inch or 4-inch AL29-4C
stainless steel complying
with UL Std. 1738
Figure 2. Contents of shipping package.
1. Remove all packing and tie-down materials.
2. Check contents of the carton against items
shown above.
1.5 Locating the SUMMIT Appliance
The appliance should be located to provide
clearances on all sides for maintenance and
inspection. It should not be located in an area where
leakage of any connections will result in damage to
the area adjacent to the appliance or to lower floors of
the structure.
SUMMIT BOILER OR WATER HEATER
Page 5
When such a location is not available, it is
recommended that a suitable drain pan, adequately
drained, be installed under the appliance.
The appliance shall be installed so that the gas
ignition system components are protected from water
(dripping, spraying, rain, etc.) during appliance
operation or service (circulator replacement, control
replacement, etc.).
The appliance is design certified by CSAInternational (AGA / CGA) for installation on
combustible flooring; in basements; in closets, utility
rooms or alcoves. SUMMIT Boilers or Water
Heaters must never be installed on carpeting.
The location for the appliance should be chosen
with regard to the vent pipe lengths and external
plumbing, If there is potential for snow accumulation
in the local area, both vent terminals should be
installed at an appropriate level above grade.
The following dimensions and requirements
should be met when choosing the locations for the
appliance:
Clearance from
Appliance Combustible Service Access
Surface Material Clearance
U. S./Canada U. S. Canada
Left Side 1" 2.5cm 6" 15cm 24" 61cm
Right Side 1" 2.5cm 12" 30cm 24" 61cm
To p 1 " 2.5cm 14" 36cm 24" 61cm
Back 1" 2.5cm 9" 23cm 24" 61cm
Front 1" 2.5cm 24" 61cm 24" 61cm
Vent 0"
Table 1. Clearances.
Example: 8' of pipe, 2 x 45° elbows and a 90°
elbow.
Equivalent Feet: 8' + (2 x 5') + (1 x 10') = 28.
If a 4" pipe size is used to permit longer vent
runs the installer must supply 4" hubless couplings (2)
and 3 x 4 bushings (2) to adapt to the appliance
fittings. The supplied vent terminals may be used with
3" diameter pipes through the outside wall. Reducing
couplings should be located inside the outside wall to
increase to the 4" pipe size. A reducing coupling and
1' of 3" pipe must be considered as 5 equivalent feet.
NOTE: It is required that a minimum horizontal
separation of 18" be maintained between the intake
and exhaust terminals and that both terminals be
installed on the same wall of the building. The intake
terminal must be installed at an elevation 6" below the
exhaust terminal to prevent exhaust gases from
entering the intake.
1.7 Locating Appliance for Proper
Vent Height
The vent locations you select must permit direct
pipe runs to the terminal from the appliance. Since the
SUMMIT appliance is designed to drain any water
that collects in the vent, it is important that you do not
build any traps or low points into the vent where water
could collect and restrict the vent. It is recommended
that a pitch of ¼" per foot of vent be built into the
vent system to direct any water in the vent back
toward the appliance. Note that standard DWV
elbows have a built in allowance for the required ¼"
per foot pitch.
NOTE: Roof terminations for air intake terminal
must prevent entry of rain water.
1.6 Locating Appliance for Correct Vent
Distance From Outside Wall or
Roof Termination
The forced draft combustion air blower in the
SUMMIT appliance has sufficient power to vent
properly when the following guidelines are followed.
Intake Exhaust
Maximum run: Maximum run:
3" pipe size 3" pipe size
55 equivalent feet 55 equivalent feet
4" pipe size 4" pipe size
105 equivalent feet 105 equivalent feet
Minimum run: Minimum run:
11½ equivalent feet 21 equivalent feet
Intake Terminal is Exhaust Terminal is
P/N 2400-102 P/N 2400-104
Equivalent feet is determined by adding 10
linear feet for each 90° elbow and 5 linear feet for
each 45° elbow to the actual linear feet of pipe
required to be installed.
1.8 Locating Appliance with Respect
to Ventilation
While the SUMMIT appliance requires no
indoor air for combustion, adequate airflow around
the appliance must be provided for proper cooling of
electrical components.
1.9 Locating Appliance with Respect to
Storage Tank(s)
SMW-200/250 Water Heater
For best results the SMW-200/250 water heater
should be located within 10 feet of the storage tank(s).
If the appliance must be installed with longer
piping runs, then larger diameter pipe or tubing must
be used. Calculate the necessary pipe diameter for the
installation using Table 3.
1.10Locating Appliance with Respect to
Return/Supply Header
SMB-200/250 Boiler
For the best results the SUMMIT SMB-200/250
Boiler should be located within 10 feet of the supply
and return headers.
Page 6
LAARS Heating Systems
If the appliance must be installed with longer
piping runs, then the larger diameter tubing must be
used. Calculate the necessary pipe diameter for the
installation using Table 3.
SECTION 2.
Venting
Figure 3. Suggested Vent Terminal Installations.
Whenever possible, locations under windows or
near doors should be avoided. Because the SUMMIT
is a condensing appliance, steaming at the flue
terminal is a normal occurrence and it should be
considered when deciding flue terminal location.
2.1.2 Intake Terminal Location
The intake pipe and terminal require a separate
4" diameter hole to install the intake fitting. The
centerline of the hole should be at least 16½" above
grade outdoors and 18" away horizontally from the
exhaust outlet. The intake should never be located
above the exhaust terminal.
Figure 5. Multiple Units Minimum Vent Terminal
Separation.
Figure 4. Alternate Vent Terminal Installations.
2.1 Locating Vent Openings On
Outside Wall
2.1.1 Exhaust Terminal Location
The exhaust pipe and terminal fitting require a
4" diameter hole through the outside wall. The
centerline of this opening must be at least 18" above
grade and at least 14" (3' in Canada) from any other
building opening such as doors, windows, etc.
Vent opening should be well away from
shrubbery or other obstructions that would block or
restrict the exhaust.
2.2 Installing Vent Piping / Terminals
The appliance is provided with intake and
exhaust terminals for use with 3" diameter plastic
pipe. If AL29-4C stainless steel venting materials that
comply with UL 1738 Standard are used, the terminals
for that system shall be used and supplied by the
installer.
The installer is responsible for obtaining the vent
pipe and fittings. The maximum combined length of
the intake and exhaust pipe and maximum number of
elbows are determined by using the guidelines in
Section 1.6.
The following steps are recommended for vent
installation of Approved plastic venting: For
installation of approved stainless steel venting
systems, follow the venting system suppliers
instructions.
1. Obtain the necessary 3" or 4" diameter plastic
piping and fittings as determined beforehand.
2. Position appliance at previously selected
location.
3. Unpack vent terminals and vent terminal backing
plates located in the box on top of appliance.
4. Cut holes in outside wall for vent terminals in
previously selected locations.
5. Mount the vent terminals backing plates.
6. Fit all of the vent pipes together without
cementing. Make sure that there are no water
traps and that any pitch is inclined back towards
the appliance.
7. Make sure that the flexible vent connections at
the appliance fit properly.
SUMMIT BOILER OR WATER HEATER
8. Begin cementing the intake and exhaust pipes,
start at the vent terminals and work back towards
the appliance. Note: The intake terminal is the
90° elbow fitting that is designed to be
installed facing down.
9. Support both horizontal vent pipes with pipe
hangers every 5'. The weight of venting must not
be supported by appliance connectors.
10. Tighten the flexible couplings to connect the
appliance to the vent. DO NOT CEMENT
VENT PIPES TO APPLIANCE — USE
COUPLINGS PROVIDED.
SECTION 3.
Gas Connections
3.1 Gas Supply and Piping
Gas piping should be supported by suitable
hangers or floor stands, not the appliance.
Review the following instructions before
proceeding with the installation.
1. Verify that the appliance is fitted for the proper
type of gas by checking the rating plate. Laars
Heating Systems appliances are normally
equipped to operate at elevations up to 2000 feet.
However, the SUMMIT appliance will function
properly without the use of high altitude
modification at elevations up to 4500 feet (1372
m). Appliances equipped to operate at higher
altitudes have appropriate stickers or tags
attached (next to the rating plate).
2. Referring to Table 2, size supply piping to keep
flow capacity to the appliance above 250 cubic
feet per hour (CFH) per installed appliance.
3. Run gas supply line in accordance with all
applicable codes.
4. Locate and install manual shutoff valves in
accordance with state and local requirements.
5. Install drip leg and ground joint union (Figure 6).
6. All threaded joints should be coated with piping
compound resistant to action of liquefied
petroleum gas.
7. The SUMMIT appliance and its individual
shutoff valve must be disconnected from the gas
supply piping during any pressure testing of that
system at test pressures in excess of 1/2 PSIG
(3.45kpa).
It must be isolated from the gas supply system
by closing its individual manual shutoff valve
during any pressure testing of the gas supply
piping system at test pressures equal to or less
than 1/2 PSIG (3.45kpa).
8. The SUMMIT appliance and its gas connection
must be leak tested before placing it in
operation.
Page 7
Figure 6. Gas Supply Piping.
Length
of
Pipe
10' (3m) 278 520 1,050
20' (6m) 190 350 730
30' (9m) 152 285 590
40' (12m) 130 245 500
50' (15m) 115 215 440
75' (23m) 93 175 360
100' (30m) 79 150 305
150' (46m) 64 120 250
Additional length to be
added for each tee or
bend
Table 2. Gas Supply Piping.
Capacity of Pipe in MBTU/HR (.6
Specific Gravity)
¾" 1" 1¼"
1.7'
(0.5m)
2.2'
(0.7m)
2.7'
(0.8m)
9. Purge all air from gas lines.
Caution:
Do not use open flame to check for leaks.
NOTE: The SUMMIT appliance and all other
gas appliances sharing the gas supply line must be
firing at maximum capacity to properly measure the
inlet supply pressure. The pressure can be measured at
the supply pressure port on the gas valve (Figure 20).
Low gas pressure could be an indication of an
undersized gas meter, undersized gas supply lines and/
or an obstructed gas supply line.
10. The correct burner manifold gas pressure (offset)
is pre-set at the factory, and normally requires no
further adjustment. See Section 7.2.2.1 Offset
Page 8
LAARS Heating Systems
and Throttle Adjustment for the proper method
of verification.
11. Before operating the appliance, the complete gas
supply system and all connections must be tested
for leaks using a soap solution.
SECTION 4A.
Water Connections
SMB-200/250 Boiler
4A.1 Heating System Piping:
Hot Supply Connections
NOTE: This appliance must be installed in a
closed pressure system with a minimum of 10 psi
static pressure.
Hot water piping should be supported by suitable
hangers or floor stands, NOT by the appliance. Due to
expansion and contraction of copper pipe,
consideration should be given to the type of hangers
used. Rigid hangers may transmit noise through the
system resulting from the piping sliding in the
hangers. It is recommended that padding be used
when rigid hangers are installed.
SUMMIT boilers must not be direct connected
to a heating system utilizing oxygen permeable tubing,
(see warranty). Provide a water to water heat
exchanger between systems to prevent corrosion of
internal pump, pump flanges, buffer tank (if installed)
or other components.
THE SUMMIT BOILER MUST BE
CONNECTED IN A PRIMARY/SECONDARY
TYPE SYSTEM OR WITH A FULL SIZED
BYPASS.
1. Connect the 1¼" supply connection on the
appliance to the system bypass. Size the
combined length of supply and return to the loop
using Table 3.
Copper tube or
pipe size
1¼" 40' (12m) 2' (0.6m) 1½' (0.5m)
1½" 120' (37m) 2' (0.6m) 1½' (0.5m)
2" 270' (82m) 2' (0.6m) 1½' (0.5m)
Table 3. Water Pipe and Tube Sizing.
Maximum
allowable tubing
length
Amount
deducted for
each additional
90° elbow
Amount
deducted for
each additional
45° elbow
2. Pipe the discharge of the relief valve, full size, to
a drain or in a manner to prevent injury in the
event of pressure relief.
3. Install an air purger, an air vent, a diaphragm
type expansion tank, and a hydronic flow check
in the system supply loop. Minimum fill pressure
must be 12psig.
4. Install shutoff valves where required.
Figure 7. Piping for Heating and Optional Domestic Hot Water.
SUMMIT BOILER OR WATER HEATER
Page 9
Figure 8. Radiant and Baseboard Heat with More Than Three Zones.
Figure 9. Indirect Tank as Buffer with Potable Water Storage Tank.
Page 10
LAARS Heating Systems
4A.2 Return Connections
1. Install a strainer between the SUMMIT boiler
and the system.
2. Connect the 1¼" return connection on the
appliance to the return side of the system
circulating loop.
3. Install a check valve (multiple appliances only),
a shutoff valve and a drain valve near the
appliance in the return line.
4. Install a properly sized circulator in the system
loop.
4A.3 Cold Water Make-Up
1. Connect the cold water supply to the inlet
connection of an automatic fill valve.
2. Install a suitable back flow preventer between
the automatic fill valve and the cold water
supply.
3. Install shut off valves where required.
NOTE: The boiler, when used in connection
with a refrigeration system, must be installed so the
chilled medium is piped in parallel with the boiler
with appropriate valves to prevent the chilled medium
from entering the boiler.
The boiler piping system of a hot water heating
boiler connected to heating coils located in air
handling appliances where they may be exposed to
refrigerated air circulation must be equipped with
flow control valves or other automatic means to
prevent gravity circulation of the boiler water during
the cooling cycle.
The boiler when installed above the radiation
level must be provided with a low water cutoff device
at the time of boiler installation.
SECTION 4B.
Water Connections
SMW-200/250 Water Heater
4B.1 Water System Piping,
Fittings and Accessories
Hot water piping should be supported by suitable
hangers or floor stands, NOT by the appliance. Due to
expansion and contraction of copper pipe,
consideration should be given to the type of hangers
used. Rigid hangers may transmit noise through the
Figure 10. Piping Diagram for Modular Units and/or Hydro Air Systems.
SUMMIT BOILER OR WATER HEATER
Page 11
Figure 11. Wiring Diagram.
system resulting from the piping sliding in the
hangers. It is recommended that padding be used
when rigid hangers are installed.
Installing Tank & Piping
The SMW-200/250 can be used with several
different types of readily available storage tanks. A
bronze circulating pump is built into the water heater.
The pump draws water from the storage tank and
pumps the water through the heater and back into the
tank.
Position the Storage Tank(s)
At the previously selected locations, position the
storage tank(s). Use Table 3 to determine the pipe size
necessary to provide adequate flow between the
SMW-200/250 and the tank(s).
Hot Water Outlet Piping, Fittings, and
Accessories
1. Begin piping to the tank from the hot water
outlet at the top of the SMW-200/250 cabinet.
2. Pipe the outlet from the relief valve (located on
top of the appliance) such that any discharge
from the relief valve will be conducted to a
suitable place for disposal when relief occurs.
Do not reduce line size or install any valves in
this line. The line must be installed to allow
complete drainage of both the valve and the line.
3. Install a shut off valve in the piping between the
thermometer fitting and the tank.
Cold Water Supply Piping, Fittings and
Accessories
1. Install a strainer between the SMW 200/250 and
the system. For proper pipe size and distance
limitations, refer to Table 3.
2. Connect a drain valve and a shut off valve to the
SMW-200/250 cold inlet. On multiple
appliances install a check valve at each
appliance’s cold water inlet.
3. Where check valves have been installed on cold
water inlet piping, check to be sure system has
an adequately sized expansion tank to allow
thermal expansion to occur.
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