LAARS HP-M2 Installation Manual
Installation, Operation and Maintenance Instructions Document 1105
Installation, Operation and
Maintenance Instructions for
HW-M2 Series H-M2 Series HP-M2 Series
H Series
OUT OF
PRODUCTION
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in hot water 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.
WARNING
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.
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.
Page 2
LAARS Heating Systems
TABLE OF CONTENTS
SECTION 1.
General Information
1A. HW Series, H Series, HP Series .................. 4
1B. to the Installer: Before You Begin ................. 4
1C. Codes and Standards................................... 5
1D. Unpacking the H Series................................ 5
1E. Locating the H Series ................................... 5
1F. Clearances ................................................... 5
SECTION 2.
Venting Options
2A. Locating Unit With Respect to Ventilation .... 5
2B. Chimney Venting (USA Only) ....................... 6
2C. Installation .................................................... 6
2D. Alternate Venting Method (Canada Only)..... 6
2E. Installing Stainless Steel
Horizontal / Vertical Venting ......................... 8
2F. Connecting special Gas Vent to H Series .... 8
2G. Appliance Joint Procedure
Part #2400-350 ............................................. 8
2H. Appliance Joint Procedure
Part #2400-352 or Z-Vent
#02SVEPXX030 ........................................... 8
2I. Securing Special Gas Vent .......................... 8
SECTION 3.
Venting and Air Source
3A. The Direct Vent Kits
(part numbers 2400-326 or 2400-328) ....... 10
3B. Installing Direct Vent Kits ............................ 10
3C. Locating the Vent on an Outside Wall ........ 10
3D. Air Source For Combustion
(when not direct vented) ............................. 10
SECTION 4.
Gas Connection to H Series
4A. Gas Connection to H Series ....................... 11
4B. Domestic Water Piping ............................... 12
PRODUCTION
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SECTION 5.
Hydronic Heat Piping
5A. Hydronic Heat Piping .................................. 12
5B. Feed Water Make-Up ................................. 12
5C. Hydronic Piping - HW Series ...................... 13
5D. Using In a Combined Hot Water
Heating and Chilled Water Cooling
System ....................................................... 13
SECTION 6.
Electrical Connections
6A. Electrical Connections ................................ 16
SECTION 7.
HP Mounting Piping
7A. Wall Mounting Instructions
Paloma/Hytech Replacement ..................... 17
7B. New Wall Mount Installation ....................... 17
7C. Hydronic Systems Connections ................. 17
7D. Plumbing Accessories Installation .............. 17
7E. Gas Supply Connection .............................. 17
SECTION 8.
HP Venting and Electrical
8A. Venting the HP-M2-Series .......................... 17
8A-1. AGA ............................................................ 17
8A-2. CGA............................................................ 18
8B. Electrical Connections ................................ 18
8C. Manufactured Home (Mobile Home)
Appliance Installation Instructions .............. 18
8C-1. Appliance Mounting .................................... 18
SECTION 9.
Check, Test and Start Up
9A. Filling System ............................................. 19
9B. Firing Burner ............................................... 19
9C. Check Limit Control Operation ................... 19
9C-1. Operating and Low Limit Control HW-M2 ... 19
9C-2. Operating Control H-M2 ............................. 20
9C-3. Safety Limit Operation H(W)-M2 ................ 20
9C-4. Stack Switch Operation H(W)-M2............... 20
9D. Common Vent Test .................................... 20
9E. Lighting and Shutdown Instructions ........... 20
H Series
Page 3
SECTION 10.
Maintenance
10A. Owner Care and Maintenance ................... 20
10B. Service Maintenance .................................. 21
SECTION 11.
Burner Input and Boiler
Component Descriptions
11A. Adjusting Burner/Input ................................ 21
11A-1. Measuring CO2* .......................................... 21
11A-2. Measuring O2.............................................. 21
11B. Cleaning Combustion Chamber Coil .......... 21
11C. Unit Pump................................................... 22
11D. Gas Valve................................................... 22
11E. Safety Limit Switch ..................................... 22
11F. Operating Control ....................................... 22
11G. Igniter ......................................................... 22
11H. Pressure Differential Switch ....................... 22
11I. Transformer................................................ 23
11J. Low Limit (HW-M2 Series Only) ................. 23
11K. Blower ........................................................ 23
11L. Priority Relay - R1 (HW-M2 series only)..... 23
11M. Boiler Control.............................................. 23
11N. Stack Switch ............................................... 23
11O. Transfer Tank and Domestic Hot
Water Coil (HW-M2 series only) ................. 23
11P. Thermostatic Union
(H(P)-M2-Series Only) ................................ 23
11Q. Time Delay Relay (TDR)
11R. DHW Coil Replacement ............................. 24
11S. Tank Replacement ..................................... 24
PRODUCTION
(H(P)-M2-series only) ................................. 24
OUT OF
SECTION 12.
Symptom Evaluations
12A. Delayed Ignition .......................................... 24
12B. Noisy Operation .......................................... 25
12C. Insufficient Hot Water
(HW - M2 - series only) .............................. 25
12D. High Gas Consumption
(see also Cross Contamination) ................. 26
12E. Shortcycling
(H-M2, HP-M2 Series only) ........................ 26
12F. Cross Contamination and
Combustion Related Short Cycling
(units installed with Quick Vent) ................. 26
12G. Lock Outs
Integrated Boiler Control Lock Outs ........... 27
SECTION 13.
Sequence of Operation
................................................................... 27
SECTION 14.
Replacement Parts
................................................................... 37
SECTION 15.
Trouble Shooting
15A. S9301A Control Module ............................. 41
15B. Quick Reference Trouble Shooter .............. 42
HW-M2 Series H-M2 Series HP-M2 Series
HW-M2-130 H-M2-130* HP-M2-130*
HW-M2-100 H-M2-100 HP-M2-100
HW-M2-60 H-M2-60 HP-M2-60
Integrated Hydronic Heating Hydronic Heating Only Hydronic Heating Only
and Domestic Hot Water Appliance for Natural or Propane Gas. for Natural or Propane Gas
for Natural or Propane Gas. (Wall Hung).
* Field conversion only.
Page 4
LAARS Heating Systems
SECTION 1
General Information
1A. HW Series, H Series, HP Series
The H Series boiler is a low pressure, hot water
boiler that is available in two (2) design
configurations. The HW series provides domestic hot
water as well as hydronic space heating. It includes an
insulated storage tank through which boiler water is
circulated. A heat exchanger within the tank transfers
heat from the boiler to the domestic hot water. The H
and HP series boilers are designed to provide hot
water for space heating, and can be plumbed to an
indirect water heater to supply domestic hot water.
By replacing the air and the gas orifices, the
basic H Series boiler has the flexibility to operate on
either natural or LP gas and may be fired at 60,000,
100,000 or 130,000 BTU/HR input. The H Series can
be direct vented by utilizing an optional concentric
vent system that will provide outside air for
combustion. H(W)(P)-60,100 & 130 appliances may
also be vented with 3" or 4" diameter stainless steel
horizontal / vertical venting as described on page 6.
The maximum length shall not exceed 50 equivalent
feet of 3" diameter or 100 equivalent feet of 4"
diameter. H(W)(P)-M2-130 appliances may also be
connected to a lined internal chimney.
The H Series features a forced draft, pre-mixed
combustion system. All air for combustion is supplied
with the gas to the burner (flameholder). Both the
intake air and the gas are metered through separate
orifices before entering the combustion air blower.
The blower forces the air/fuel mixture through the
flameholder and into the combustion chamber. The
mixture is ignited from the hot surface igniter and
burns. Hot gases are forced out between the passes of
the heat exchanger into the flue collector. Flue gases
are discharged into the outside atmosphere through the
vent terminal, a chimney, horizontal or vertical
alternate vent.
Model H(W)-M2-60 & H(W)-M2-100 UNITS
MUST NOT BE CHIMNEY CONNECTED.
Installations with water containing 10 grains of
hardness or higher, must be installed with appropriate
water treatment.
PRODUCTION
OUT OF
1. Gas Burner*
2. Sealed Combustion* w/ P/N 2400-236 or
2400-238
3. Outside Vent Wall*
4. Outside Air For Combustion*
5. Copper Coil Heat Exchanger*
6. Thermostatic Union (H-M2)
7. Domestic Hot Water Coil (HW(D)-M2)*
8. Heating System Water Outlet
9. Heating System Water Return
10. Gas Supply
(*see Figure 1)
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1B. To the Installer: Before You Begin
The H Series is uniquely different from any
heating boiler you have installed in the past. It is
important for you to take a few minutes to review the
contents of the Installation and Operating section of
this manual before you begin installation. This will
avoid making mistakes and causing confusion when
installing and operating the unit.
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Figure 1. HW-M2.
H Series
Page 5
1C. Codes and Standards
All installations must be made in accordance
with: 1). The National Fuel Gas Code, ANSI Z223.1 latest edition or 2). CAN/CGA - B149 “Installation
Codes for Gas Burning Appliances and Equipment” or
with the requirements 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 1). The National
Electrical Code ANSI/NFPA70-latest edition or 2).
The CSA standard C22.1 “Canadian Electrical Code Part 1” and local codes.
All vent installations must be made in
accordance with: 1). Part 7, Venting of Equipment of
the National Fuel Gas Code, ANSI 223.1- latest
edition, or applicable provisions of the local building
codes or 2). CAN/CGA - B149
When required by the jurisdiction authority, the
installations must conform to the American Society of
Mechanical Engineers’ Safety Code for Controls and
Safety Devices for Automatically fired Boilers, No.
CSD-l.
1D. Unpacking the H Series
a. Remove all packing and tie down materials.
b. On HW models, remove three (3) shipping bolts
from underside of base.
c. Make immediate claims ( to carrier ) if unit is
damaged.
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OUT OF
1E. Locating the H Series
The H Series design is certified by the AGA and
CGA for installation on combustible flooring, in
alcoves, basements, closets, or utility rooms. It must
not be installed on carpeting. IF INSTALLED IN A
FINISHED AREA, PROVISION SHOULD BE
MADE FOR DRAINAGE OF ANY ACCIDENTAL
SPILLAGE OR LEAKAGE.
The location for the unit should be chosen with
regard to venting dimensions, convenient access to
piping, ventilation of operating components and
accessibility for service and cleaning.
The boiler 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.).
1F. Clearances
The following dimensions and criteria should be
followed when choosing the location for the unit:
A. B.
AGA/
AGA CGA
CGA
Left Side 1" 6" 24"
Right Side (controls) 1" 12" 24"
Top 1" 14" 16"
Back 1" 9" 12"
Front 1" 24" 24"
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Figure 2. H-M2.
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Vent: Direct Vent 0" 0"
Chimney Connect 6" 6"
Alternate 3" 3"
Clearances
A. Minimum clearance from combustible
construction to meet AGA/CGA requirements.
B. Recommended clearance for accessibility and
venting.
SECTION 2.
Venting Options
2A. Locating Unit With Respect
to Ventilation
While the H Series, when direct vented, requires
no interior air for combustion, adequate airflow
around the unit and to the enclosed room must be
provided for proper cooling of electrical components.
Page 6
SUPPLY
DOMESTIC
RETURN
LAARS Heating Systems
↑
3.5" deep
Figure 3. HW-M2.
2B. Chimney Venting (USA Only)
Model H(W)-M2-60 and H(W)-M2-100 MUST
NOT BE CHIMNEY OR B-VENT CONNECTED.
Model H(W)-M2-130 is a category l boiler and
may be vented in chimneys subject to the following
requirements:
Chimney must be internally lined or “B” vent
type. EXTERNAL OR UNLINED CHIMNEYS MAY
ONLY SERVE AS A CHASE for utilization of
stainless steel alternative venting providing no other
equipment is vented into it, or the chimney may have
an approved liner installed into the flue.
Two (2) or more vent connectors, from either
power or natural draft units, may enter a common gas
vent providing they conform to the requirements and
tables of the National Fuel Gas Code, ANSI Z223.1/
NFPA 54- latest edition, or applicable provision of the
local building code. None may be connected to
equipment with a positive vent pressure.
Locate unit as close to chimney as possible for
shortest vent connector.
2C. Installation
Determine height of chimney or B-Vent and
length of lateral run. Select vent connector diameter
from:
1). Table 1 or 2 of the National Fuel Gas Code,
ANSI Z223.1 / NFPA 54- latest edition (see
excerpts), or
2). Table G-3 of the Can /CGA - B149 Installation
Code.
Install an adaptor at the flue outlet of the unit to
step up to the diameter of the vent connector. Install
elbow for vent connector, if required. This elbow
should be full size of the vent connector. DO NOT
install a three (3) inch elbow between the flue outlet
PRODUCTION
OUT OF
Figure 4. H-M2.
on the unit and the adaptor. DO NOT use plastic vent
pipe in any part of the chimney vent connection.
Install vent connector between elbow, if used,
and chimney. Pitch vent connector up toward chimney
¼" per foot of lateral run. Secure all joints with
sheetmetal screws.
2D. Alternate Venting Method
(Canada Only)
The H Series may be vented vertically up
through a masonry chimney using a 4" diameter ULC
Certification Flexible Stainless Steel Vent.
Observe the following requirements:
1). The flexible vent must be run from the boiler up
through the entire chimney.
2). The chimney must terminate with a suitable vent
cap.
3). If chimney is exposed, the vent pipe should be
insulated.
4). The vent pipe must be installed with a ¼" per
foot upward slope from the boiler to the
chimney.
5). The vent pipe must be supported every 3' to
prevent sagging.
6). All joints in the vent must be secured with at
least two corrosion resistant screws and sealed
with an approved silicone sealant and checked
for gas tightness.
7). The vent system should be checked once a year
by a qualified serviceman.
Note: Boiler may not be vented in common with
another gas appliance or be vented using B-vent.
H Series
Page 7
Vent Connector Diameter (A & D)
Height Lateral
H L Fan Assist Fan Assist
(ft) (ft) Min Max Min Max
0 85 249 126 373
6
8
10
15
20
30
Capacity of Tybe B Double-Wall with Single Wall
Metal Connectors Serving a Single Category I Appliance.
NOTE: TABLES APPLY TO MODEL H(W)-M2 130
(CATAGORY 1) APPLIANCES ONLY.
2 85 156 123 231
4 102 152
6 114 147
0 83 273 123 412
2 83 176 121 261
5 107 168
8 122 161
0 82 293 120 444
2 82 193 119 287
5 105 185
10
0 80 325 116 499
2 80 225 115 337
5 102 216
10 128 201
0 78 346 114 537
2 78 248 113 375
5 100 239
10 125 223
0 76 372 110 584
2 76 281 109 429
5 98 271
10 122 255
15
PRODUCTION
5" 6"
Appliance Rating in MBH
OUT OF
Table 1.
Type B Double Connector Diameter to be used with
chimney areas within the size limits at bottom
Height Lateral
H L Fan Assist Fan Assist
(ft) (ft) Min Max Min Max
10 2 68 519
2 53 475 64 613
15
20
30
50
Minimum Internal
Area of Chimney
Square Inches
Maximum Internal
Area of Chimney
Square Inches
Type-B Double Wall Flue Connector Serving a
NOTE: DERATE "FAN MAX" CAPACITY IN TABLE 2 BY
20% WHEN SIZING FLEXIBLE METAL FLUELINERS.
5 99 594
10 126 565
2 51 522 61 678
5 80 503 95 658
10 122 627
2 47 581 57 762
5 75 561 90 741
10 115 709
2 51 840
5 83 819
Capacity of Masonary Chimney Flue with
Single Category Appliance.
7" 8"
Appliance Rating in MBH
50 63
269 352
Table 2.
Figure 5. Tiled Lined Chimney. Masonry Chimney
Serving a Single Category I Appliance (see Table 2).
Page 8
LAARS Heating Systems
2E. Installing Stainless Steel
Horizontal / Vertical Venting
(non concentric)
Stainless Steel Special Gas Vent listed to U.L.
Standard 1738 and U.L.C. Standard 636 may be used
to vent all H Series H(W)(P) and DH(P) models. Vent
pipe and fittings are manufactured to these Standards
by Heat-Fab, Inc. under the trade name of Saf-T
Vent® and by Z-Flex™ under the trade name of
Z-Vent. Follow the Special Gas Vent manufacturers’
instructions regarding design, location and assembly
of the vent system.
The H Series appliance may be vented with any
number of elbows or fittings provided that the
maximum equivalent feet of venting is not exceeded.
90° elbows in the vent system shall be considered to
be 10 equivalent feet. When vented with Special Gas
Vent, the H Series must not be common vented with
any other appliance.
2F. Connecting Special Gas Vent
to H Series
Teledyne part number 2400-372 (Figure 6) is
used to secure the Special Gas Vent to the flue outlet
of the H Series*. Heat-Fab pipe or fittings (part
numbers 2400-350 or 2400-352) or the male end of
Z-Vent pipe (Z-Vent # 02 SVEPXX030) may be
installed over the flue outlet of the H Series.
*If a duct is used around the Special Gas Vent to
bring in combustion air from another location, the
connection of that duct to the appliance must be
secured with sheetmetal screws.
Each joint between the appliance and the last
joint before the location where the Special Gas vent
exits the duct must also be secured with sheetmetal
screws.
In this application, part number 2400-372 is not
used at the boiler flue collar. It is used, and must be
used, to secure the Special Gas Vent at the point
where the Special Gas Vent exits the duct.
The combustion air supply should be protected
from debris entering the duct. This may be done with a
H Series Vent Terminal, part number 2400-277, as
shown in Figure 7 or with a large mesh screen.
Follow the Special Gas Vent manufacturer’s
instructions for cleaning and sealing all parts before
assembling.
PRODUCTION
OUT OF
2G. Appliance Joint Procedure
Part #2400-350 (See Figure 8)
Apply 1/4" bead of silicone sealer (GE108 or
Novagard 400) to the 3 inch (3") flue outlet of the H
Series approximately one inch (1") from the end.
Slide flue adapter over the H Series flue outlet
(flared up end) and push down to stop (do not force
adapter beyond stop).
Apply another bead of silicone around this joint
and smooth out.
Apply 1/4" bead of silicone to the straight end of
the 2400-350 pipe approximately 1/4" from the end.
Slide the pipe into the adapter until it bottoms in
the adapter.
Apply another bead of silicone around this joint
and smooth out.
2H. Appliance Joint Procedure
Part #2400-352 or Z-Vent
#02SVEPXX030 (see Figure 8)
Apply 1/4" bead of Silicone sealer (GE 108 or
Novagard 400) to the 3 inch (3") flue outlet of the H
Series approximately one inch (1") from the end.
Slide pipe over the H Series flue outlet and push
down to stop (do not force pipe beyond stop).
Apply another bead of silicone around this joint
and smooth out.
2I. Securing Special Gas Vent
Attach part number 2400-372 to 5" collar on
appliance or end of five inch (5") combustion air duct
and tighten large clamp.
Form tabs on part number 2400-372 onto Special
Gas Vent pipe and secure tabs with the 3" clamp.
After the clamp has been tightened, fold the end
of the tabs down over the clamp.
DO NOT use screws in any portion of the 3"
Special Gas Vent.
For vertical venting see instructions in the
Vertical Vent Kit pertaining to use of raincaps and
condensate drip tee's.
H Series
Figure 6. Part Number 2400-372.
Page 9
OUT OF
PRODUCTION
Figure 7. Vent Terminal Used As An Air Screen.
Figures 8 and 9. Vent Pipe Attachment.
Page 10
LAARS Heating Systems
SECTION 3.
Venting and Air Source
3A. The Direct Vent Kits
(part numbers 2400-326 or 2400-328)
When using the Direct Vent Kit, the H Series is a
sealed combustion unit. All of its air is drawn in from
the outside through the 5" outer pipe. Flue gases are
vented through the 3" vent pipe positioned inside the
5" intake pipe. The hot flue gases are surrounded by
the intake flow of cooler outdoor air. This vent system
may be installed through, and be in contact with,
combustible materials.
3B. Installing Direct Vent Kits
The Direct Vent H Series is certified with a
maximum of 15 linear feet of vent pipe and one set of
elbows. Systems may be vented with a maximum of
three sets of concentric elbows providing the
maximum length is reduced by three linear feet for
each additional elbow set. Provide a minimum of 16"
above the top of the boiler for vent installation and
servicing. There are two vent kits available. Part
numbers 2400-326 and 2400-328 provides all of the
required materials. Part number 2400-326 for vent
installations which require adjustable height and
horizontal run. This kit will permit vertical and
horizontal lengths of pipe from 2' or 4'. One foot
extensions and 2' to 4' extensions are available to
increase vent lengths to the maximum allowed.
Additional sets of elbows are also available.
Part number 2400-328 provides all of the
required materials for vent installations which may
have a fixed height of 11 inches and an adjustable
horizontal run of 2' - 4'. Accessories for P/N 2400-326
also fit P/N 2400-328.
3C. Locating the Vent on an Outside Wall
Exterior vent should terminate 16½" above
grade, and at least 13 ½" from any other building
opening such as doors, windows, etc. Units
terminating below the top of the boiler must reduce
allowable vent length by 1" for every foot of vertical
drop below the top.
Vent opening should be well away from
shrubbery or other obstructions that would prevent
free air flow to and from vent terminal. Do not
PRODUCTION
OUT OF
terminate vent under decks, stairways, or car ports.
When ever possible, locations under windows should
be avoided.
NOTE: Should it be impossible to locate
opening center line 16 ½" above grade, use optional
Vent Terminal Extension (Part Number 2400-278).
(see Figure 4).
Vent terminals must also be at least 3' above any
forced air inlet located within 10', and at least 7' above
grade when located adjacent to a public walkway, and
cannot terminate in a location where condensate or
vapor may be a nuisance, hazard, or could be a
detriment to other equipment. Vent terminals must
have a minimum clearance of 4 feet horizontally from,
and in no case above or below electrical meters, gas
meters, regulators, and relief equipment unless a 4 foot
horizontal distance is maintained .
Do not locate the vent terminal where blockage
by snow is a possibility, or where flue products could
strike against building materials and cause degradation.
3D. Air Source For Combustion
(when not direct vented)
When using these venting methods the H Series
draws all combustion air through the top of the unit
and from the space around the boiler. When locating
the unit in unconfined spaces in buildings, infiltration
may be adequate to provide air for combustion and
ventilation; however, in buildings of unusually tight
construction, or when locating the unit in a confined
space, additional air should be provided and the
following guidelines must be followed.
1. If the space is in a building of unusually tight
construction, air should be obtained from
outdoors, or from spaces which freely connect
with outdoors.
PLUG
5" TEE
3" VENT
4" MIN. DIA
INTAKE AIR
SCREEN
8" MIN.
Figure 10. Direct Vent Terminal Clearance.
H, HP or HW with
Separate Air
Source.
ALTERNATE TO 1. - 3. ABOVE
Figure 11. H, HP or HW with Separate Air Source.
H Series
2. For boilers in confined rooms, two permanent
openings shall be provided - one within 12" of
the ceiling, and one within 12" of the floor of
each room. Each opening shall be at least one
square inch per 1,000 BTU/HR boiler input, but
not be less than 100 square inches. These
openings shall freely connect with areas having
adequate infiltration from outside.
3. When all air is provided from outdoors, the
confined space shall be provided with two
openings as outlined above. These openings shall
connect directly, or by ducts, with outdoors or
spaces (crawl or attic) that freely connect with
the outdoors, and shall be of the size listed below
for that particular arrangement.
a. One square inch of free area per 4,000
BTU/HR of boiler input for direct outdoor
air supply through an outside wall, or
through vertical ducting directly to outside.
b. One square inch of free area per 2,000
BTU/HR of boiler input for direct outdoor
air through horizontal ducting.
c. All ducting shall be of the same size as the
opening to which it is connected.
OUT OF
Figure 12. Gas Piping.
Length
of
Pipe
10' 132 278 520 1,050
20' 92 190 350 730
Capacity of Pipe in MBTU / HR
Page 11
(.6 Specific Gravity)
½" ¾" 1" 1¼"
SECTION 4.
Gas and Domestic Water Piping
4A. Gas Connection to H Series
least 4" W.C and no greater than 13" W.C. Check with
your local gas utility or supplier for availability of this
pressure range.
minimize pressure drop between meter or regulator
and unit.
applicable codes. IF UNIT IS INSTALLED ABOVE
GAS SUPPLY, RUN PIPPING UP TO A POINT
ABOVE VENT CENTER LINE AND BACK DOWN
TO UNIT. THIS WILL PREVENT WATER FROM
ENTERING GAS SUPPLY SHOULD A LEAK
DEVELOP IN THE BOILER SECTION (see
Figure 12).
accordance with state and local requirements.
to trap sediment and for test gauge access (see
Figure 12).
compound resistant to action of liquefied petroleum
gas whether LPG is used or not.
be disconnected from the gas supply piping system
PRODUCTION
The H Series requires an inlet gas pressure of at
Referring to Table 4, size supply piping to
Run gas supply line in accordance with all
Locate and install manual shutoff valves in
Install drip leg, ground joint union and drip cap
Support all piping with proper hangers.
All threaded joints should be coated with piping
The boiler and its individual shutoff valve must
30' 73 152 285 590
40' 63 130 245 500
50' 115 215 440
75' 93 175 360
100' 79 150 305
150' 64 120 250
Additional
length to be
added for each
tee or bend
during any pressure testing of that system at test
pressures in excess of 1/2 psig (3.5kPa).
The boiler must be isolated from the gas supply
piping 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 (3.5kPa).
The boiler and its gas connection must be leak
tested before placing the boiler in operation.
Purge all air from gas lines.
Note: H Series’ are certified for 4" to 13" W.C.
We find on L/P the unit performs better when the low
pressure regulator is not set over 9" W.C. Use an
appliance regulator (maxitrol RV48 or equivalent) if
more than 3" lock up occurs in gas supply.
1.3' 1.7' 2.2' 2.7'
Table 4. Gas Pipe Capacity.
Page 12
WATER
H
E
A
T
M
A
K
E
R
Figure 13. Domestic Water Piping.
1
6"*
15
AQUASTAT
OPTIONAL RETURN LINE PIPING
* or per valve manufacturers instructions.
CIRCULATOR
4B. Domestic Water Piping
Connect hot water tempering valve (12) “HOT”
port to hot water outlet from unit. This valve should be
mounted 3" to 6" below the outlet and set for 120° F
mixed delivery temperature or as local codes dictate.
H SERIES RECOMMENDS ANTI SCALD VALVE
SUCH AS SPARCO OR DANFOSS. (see Figure 13).
Connect gate or shutoff valve (13) to tempering
valve (12) “MIX” port, and cold water inlet.
Install supplied flow restrictor (14) ahead of mix
valve tee.
Connect pressure relief valve (1) (if required by
codes), maximum 150 PSI as close to the unit as
possible. No other valves or restrictions may be
installed between the H Series and the relief valve.
(DO NOT USE A TEMPERATURE/
PRESSURE RELIEF VALVE AS THIS IS NOT A
STORAGE HOT WATER HEATER).
*Model 60 is not recommended for larger hot
water demands.
Failure to install a hot water tempering valve (12)
creates a scalding hazard with potential for serious
bodily injury.
not designed as anti scold valves.
Installations with water containing 10 grains of
hardness or higher, must be installed with appropriate
water treatment.
PRODUCTION
WARNING
Some brands of tempering valves are
SOFTENER
12
OUT OF
SUPPLIED
13
14
13
LAARS Heating Systems
SECTION 5.
Hydronic Heat Piping
5A. Hydronic Heat Piping
Hydronic Connections, Fittings and Accessories
(see Figure 16).
NOTE: A SEPARATE HEATING
CIRCULATOR MUST BE PROVIDED IN
SYSTEM PIPING, FOR ALL MODELS.
Connect system supply to 1" supply connection (A).
1. Install thermostatic union (supplied) on H, HP
boilers.
2. Pipe the discharge of the relief valve, full size, to
a drain or in a manner to prevent injury or
property damage in the event of pressure relief.
3. Install an air purger (2) in supply line.
4. Install automatic float type air vent (3) on air
purger.
5. Connect diaphragm type expansion tank (5) to
air purger.
6. Install a boiler drain valve (8) adjacent to unit in
return line.
7. Connect system return to 1" return connection (B).
8. Install a properly sized circulator (9) with
optional isolation valves (10).
Caution
All hot water pipes must be installed with a
minimum 1" clearance from combustible materials.
NOTE: H, HP boilers installed in radiant (in
floor) systems and other low mass systems should be
provided with a buffer tank to assure constant supply
temperature without excessive boiler short cycling
(see Figure 17).
5B. Feed Water Make-Up
Connect boiler feed water supply with shut off
valve to inlet connection of automatic fill valve (4).
If codes require, install suitable back-flow
preventor (11) between automatic fill valve and city
main.
To ensure sufficient expansion volume of the
hydronic system water due to heat-up and cool-down
during normal operation, a #30 or larger expansion
tank must be used on all HW series applications.
H Series
Page 13
5C. Hydronic Piping - HW Series
HW-M2 boilers are installed in single and
multiple zone systems ( using either zone valves or
zone circulators) in the same manner as any other
residential boiler. Systems with zone circulators or
single zone systems require the installation of a
hydronic flow check (6) to prevent gravity circulation
of heating supply water when no heat is desired.
To minimize heat loss from the storage tank
(HW) during standby periods, it is recommended that
the piping between the H Series up to and including
the vertical leg be insulated with ½" - ¾" of insulation.
Caution
Unless equipped with optional stainless steel tank,
the HW model 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
tank or other components.
OUT OF
Nontoxic heating system antifreeze may be
added to the hydronic system provided that the
concentration does not exceed 35% and the antifreeze
contains an anti-foamant.
5D. Using In a Combined Hot Water
Heating and Chilled Water Cooling
System
When the H Series is used in connection with a
refrigeration system, it must be installed so that the
chilled medium is piped in parallel with the boiler
with appropriate valves to prevent the chilled medium
from entering it.
The boiler piping system of a H Series boiler
connected to heating coils located in air handling units
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.
PRODUCTION
Figure 14. Hydronic Piping (HW).
Page 14
LAARS Heating Systems
OUT OF
PRODUCTION
Figure 15. Hydronic Piping with Indirect H(P).
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