Hydro-Smart HS120CON-LP User manual

The Hydro Smart 120 Condensing Gas
Micro-Boiler is a compact and powerful
residenal unit with a versale BTU
modulang range.
Please refer to local codes for space-heang compliance.
If you have any quesons, please
call or write to:
10725 165th Ave NW
Elk River, MN 55330
1-763-331-3066
WARNING
- 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 electric switch, do not
use any phone in your building.
• Immediately call your gas supplier from
a neighbor's phone. Follow the gas
supplier's instrucons.
•If you cannot reach your gas supplier,call
the fire department.
- Installaon and service must be performed
by a qualified installer,service agency or the
gas supplier.
Hydro Smart 120 Condensing Gas Micro Boiler
Installaon Manual and Owner’s Guide
ANSI Z21.10.3 and CSA 4.3
If the informaon in these
instrucons is not followed
exactly,a fire or explosion may
result causing property damage,
personal injury or death.
FEATURING
•EFFICENCY: 93%
•TEMP RANGE: 99°-140°F
•COMPACT,SPACE SAVING
•FLOW ACTIVATED: .75 GPM
•COMPUTERIZED SAFETY
•NO PILOT LIGHT
•Sasfies the 2012 SCAQMD Rule
1146.2 for Ultra-Low NOx
Emissions
Models
•HS120CON-LP (Liquid propane)
•HS120CON-NG (Natural gas)

2 Page
Installaon Manual
Contents
CONTENTS
Installaon Manual
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SAFETY GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Included accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Venng instrucons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Gas supply and gas pipe sizing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Water connecons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Condensate drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Electrical connecons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
High-altude installaons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 26
Hydro Smart Pre-built Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
INITIAL OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
OPTIONAL ITEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Owner's Guide
OPERATING SAFETY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
NORMAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Display of controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Temperature table of controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Temperature sengs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Addional features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Freeze protecon system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Maintenance and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Unit draining and filter cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
COMPONENTS DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
OUTPUT TEMPERATURE CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
LIMITED WARRANTY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
•This installaon manual is approved for installaon in the United States.
NOTICE

3 Page
Installaon Manual
CONGRATULATIONS
Congratulaons and thank you for choosing our condensing micro-
boiler. Before use, we recommend that you read through this safety
manual carefully. Please refer to the back of the manual for details about the
warranty.Keep this manual for future reference.
If you lose the manual, contact the manufacturer or your local
distributor.When you call, please tell us the model number and the
serial number of your unit wrien on the rang plate of the micro-
boiler.

4 Page
Installaon Manual
Specificaons
SPECIFICATIONS
*40 psi (0.27 MPa) or above is recommended for maximum flow.
** The Manifold Pressure is the factory seng and should not need adjustment.
NOTE:
• Check the rang plate to ensure this product matches your specificaons.
• In accordance with ANSI Z21.10.3, CO emission does not exceed 400 PPM for normal input.
• The manufacturer reserves the right to disconnue, or change at any me, specificaons or designs
without noce and without incurring obligaon.
Natural Gas Input
(Operang Range) BTU/h Min.: 15,000
Max.: 120,000
Propane Input
(Operang Range) BTU/h Min.: 15,000
Max.: 120,000
Gas Connecon 1/2" NPT
Water Connecon 3/4" NPT
Water Pressure* psi
(MPa) 15 - 150 (0.1 - 1.0)
Natural gas
Inlet Pressure
inch W.C.
(kPa)
Min. 5.0 (1.2)
Max. 10.5 (2.6)
Propane
Inlet Pressure
inch W.C.
(kPa)
Min. 8.0 (2.0)
Max. 14.0 (3.5)
Manifold
Pressure**
Natural
Gas
inch W.C.
(Pa)
3.30
(820)
2.00
(500)
Propane inch W.C.
(Pa)
3.00
(750)
1.60
(400)
Weight lbs. (kg) 58 (22.5) 58 (22.5)
Dimension
inch H 21-3/4 x W 14 x D 9-1/4
H 552 x W 352 x D 236
mm
Ignion Electric Ignion
Electric
Supply VAC / Hz 120 / 60
Consumpon
Operaon W / A 53.9 / 0.7
Standby W / A 3.2 / 0.05
Freeze-
ProteconW / A 223.9 / 1.94
Hydro Smart Gas Condensing Micro-Boiler

5 Page
Introducon
Installaon Manual
INTRODUCTION
• This manual provides informaon necessary for the installaon, operaon, and maintenance
of the micro-boiler.
• The model descripon is listed on the rang plate which is aached to the side panel of the
micro-boiler.
• Please read all installaon instrucons completely before installing this product.
• If you have any problems or quesons regarding this equipment, consult the manufacturer or
its local representave.
• These high efficiency models have a built-in secondary heat exchanger that absorbs latent
heat from the exhaust gas.
• The 140 Indoor (T-H3M-DV) model is only to be installed indoors. The 140 Outdoor (T-H3M-
OS) model is only to be installed outdoors.
• The principle behind condensing micro-boiler is simple:
*This diagram illustrates condensing micro-boiler design concepts only and does not accurately
represent the micro-boiler’s physical descripon.
1. Your thermostat indicates a need for heat and turns on a circulator pump.
2. Fluid enters the heater.
3. The flow sensor detects the fluid flow.
4. The computer iniates the fan motor and sends a signal to the igniter to create an ignion
spark.
5. The gas ignites and flames appear within the burner chamber.
6. Fluid circulates through the heat exchanger and then gets hot.
7. Using thermistors to measure temperatures throughout the micro-boiler,the computer
modulates the gas and water valves to ensure proper output fluid temperature.
8. Your room reaches desired temperature and the micro-boiler shuts off.
Burners
Exhaust
Secondary
heat exchanger
Primary
heat exchanger
Igniter
Gas valve
Fan motor
Flow sensor
Condensate
drain port
Gas inlet
Cold water inlet
Thermistor
Hot water outlet
Thermistor
Intake port
Exhaust
Thermistor
Water control
valve
Computer
board

6 Page
SAFETY GUIDELINES
SAFETY DEFINITION
Indicates an imminently hazardous situaon which, if not avoided, will result in
death or serious injury.
DANGER
WARNING
Indicates an imminently hazardous situaon which, if not avoided, could result
in death or serious injury.
CAUTION
Indicates an imminently hazardous situaon which, if not avoided, could result
in minor or moderate injury.
GENERAL
1. Follow all local codes, or in the absence of local codes, follow the most recent edion of the Naonal
Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or CAN/CSA B149.1 Natural Gas, Propane Installaon
Code in Canada.
2. Properly ground the micro-boiler in accordance with all local codes or in the absence of local codes,
with the Naonal Electrical Codes: ANSI/NFPA 70 in the USA or CSA standard C22.1 Canada Electrical
Code Part 1 in Canada.
3. Carefully plan where you intend to install the micro-boiler. Please ensure:
• Your micro-boiler will have enough combusble air and proper venlaon.
• Locate your boiler where fluid leakage will not damage surrounding areas (please refer to p. 8).
4. Check the rang plate for the correct GAS TYPE, GAS PRESSURE, FLUID PRESSURE and ELECTRIC
RATING.
*If this micro-boiler does not match your requirements, do not install and consult with the manufac-
turer.
5. If any problem should occur, turn offall thermostats and turn offthe gas. Then call a trained
technician or the Gas Company or the manufacturer.
WARNING
• Do not store or use gasoline or other flammables, vapors, or liquids in the
vicinity of this appliance.
• Do not reverse the fluid and/or gas connecons as this will damage the gas
valves and can cause severe injury or death. Follow the diagram on p. 22
when installing your micro-boiler.
• Do not use this micro-boiler if any part has been in contact with or been
immersed in water. Immediately call a licensed plumber, a licensed gas fier,
or a professional service technician to inspect and/or service the micro-boiler
if necessary.
• Do not disconnect the electrical supply if the ambient temperature will drop
below freezing. The Freeze Protecon System only works if the micro-boiler
has electrical power. The heat exchanger will not be covered under warranty
if it is damaged due to freezing. Refer to the secon on the Freeze Protecon
System on p. 40 for more informaon.
Installaon Manual
Safety Guidelines

7 Page
Installaon Manual
INSTALLATION
GENERAL
1. Follow all local codes, or in the absence of local codes, follow the most recent edion of the Naonal
Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or CAN/CSA B149.1 Natural Gas, Propane Installaon
Code in Canada.
2. All gas micro-boilers require careful and correct installaon to ensure safe and efficient operaon.
This manual must be followed exactly. Read the “Safety Guidelines” secon.
3. The manifold gas pressure is preset at the factory. It is computer controlled and should not need
adjustment.
4. Maintain proper space for servicing. Install the micro-boiler so that it can be connected or removed
easily. Refer to the "Clearances" secon on p. 9 for proper clearances.
5. The micro-boiler must be installed in a locaon where the proper amount of combusble air will be
available to it at all mes without obstrucons.
6. The electrical connecon requires a means of disconnecon, to terminate power to the micro-boiler
for servicing and safety purposes.
7. Do not install the micro-boiler where the exhaust vent is poinng into any opening in a building or
where the noise may disturb your neighbors. Make sure the vent terminaon meets the required
distance by local code from any doorway or opening to prevent exhaust from entering a building (refer
to p. 17 to 19).
8. Parcles from flour, aerosols, clothes dryers and other airborne contaminants may clog the air vent,
build up and reduce the funcons of the rotang fan, cause improper burning of the gas, or cause
damage to the micro-boiler. Regularly ensure that the area around the micro-boiler is dust- or debris-
free. Regular maintenance is recommended for these types of environments. Sealed combuson is
recommended too.
9. The Hydro Smart 120 micro-boiler is to be installed indoors only. The model is equipped with a
thermistor and hi-limit switch for the exhaust gas, detecng excess temperatures within the flue and
enabling the micro-boiler to safely stop operaon if needed. These components are always monitoring
exhaust gas condions in order to prevent heat damage to ABS, PVC, CPVC, or Polypropylene (Plasc)
venng if ABS, PVC, CPVC, or Polypropylene is used. If the exhaust gas temperature exceeds 140 °F
(60 °C) these components will enable the micro-boiler to safely stop operaon.
• The micro-boiler requires 3 inch, or 4 inch diameter intake air supply pipe. The intake pipe must
be sealed airght.
• Air supply pipe can be made of aluminum flexible tube, ABS, PVC, CPVC, Polypropylene,
corrugated stainless steel, or Category lll / IV stainless steel. Regarding exhaust pipe, please refer
to p.11 for detailed informaon.
• Sidewall venng is recommended for this boiler. Vercal venng (roof terminaon) is
acceptable.
•The manufacturer recommends running the exhaust vent and the intake pipe as parallel as possible.

8 Page
• Installaon and service must be performed by a qualified installer (for example, a
licensed plumber or gas fier), otherwise the warranty will be void.
• The installer (licensed professional) is responsible for the correct installaon of
the micro-boiler and for compliance with all naonal, state/provincial, and local
codes.
• The manufacturer does not recommend installing the micro-boiler in a pit or
locaon where gas and water can accumulate.
• Do not have the vent terminal poinng toward any operang window, door, or
opening into a building.
• Do not install the micro-boiler next to any source of airborne debris, such as a
clothes dryer and a vent that can cause debris to be trapped inside the combuson
chamber, unless the system is direct-vented.
• The manufacturer does not recommend installing the micro-boiler in an ac due
tosafety issues. If you install the micro-boiler in an ac:
• Make sure the micro-boiler will have enough combuson air and proper
venlaon.
• Keep the area around the micro-boiler clean. When dust collects on the flame
sensor, the micro-boiler will shut down on an error code.
• Place the micro-boiler in a locaon that provides easy access for service and
maintenance.
• A drain pan, or other means of protecon against water damage, is required to
be installed under the micro-boiler in case of leaks.
• It is recommended to direct vent the heater.
WARNING
• Damage caused by water quality is not covered by the warranty.
• Only potable water or potable water / glycol mixtures can be used with this
micro-boiler. Do not introduce pool or spa water, or any chemically treated
water into the micro-boiler.
• Water hardness levels must not exceed 7 grains per gallon (120 ppm) for single
family domesc applicaons or more than 4 grains per gallon (70 ppm) for
all other types of applicaons. Water hardness leads to scale formaon and
may affect / damage the micro-boiler. Hard water scaling must be avoided or
controlled by proper water treatment.
• Water pH levels must be between 6.5 and 8.5
• Well water must be treated.
• Do not install the micro-boiler where water, debris, or flammable vapors may get
into the flue terminal.
• Although the micro-boiler is designed to operate with minimal sound, the
manufacturer does not recommend installing the micro-boiler on a wall adjacent
toa bedroom, or a room that is intended for quiet study or meditaon, etc.
• Locate your boiler close to a drain where water leakage will not do damage to
surrounding areas. As with any fluid heang appliance, the potenal for leakage
at some me in the life of the product does exist. The manufacturer will not be
responsible for any water damage that may occur. If you install a drain pan under the
micro-boiler, ensure that it will not restrict the combuson air flow .
CAUTION

9 Page
INCLUDED ACCESSORIES
Check that these items below are included with the micro-boiler.
Installaon Manual
and Owner’s Guide
Bird Screen
Indoor model only
Qty: 1 Qty: 2
*For more informaon on oponal items, please refer to p.32 to 33.
CLEARANCES
Maintain all clearances around
the micro-boiler.
Model Top Boom Front Back Sides
HS120Con-LP
(Liquid propane)
12 in.
(305 mm)
12 in.
(305 mm)
4 in.*
(102 mm)
1 in.
(25 mm)
3 in.
(76 mm)
HS120Con-NG
(Natural Gas)
*24 inches recommended for maintenance
Top
Back
Side
Side
Front
12 in.
(305 mm)
12 in.
(305 mm)
4 in.*
(102 mm)
1 in.
(25 mm)
3 in.
(76 mm)

10 Page
VENTING INSTRUCTIONS
For the 140 Indoor (T-H3M-DV) model
-General-
• Improper venng of this appliance can result in excessive levels of carbon
monoxide which can result in severe personal injury or death.
• Improper installaon can cause nausea or asphyxiaon, severe injury or death
from carbon monoxide and flue gases poisoning. Improper installaon will
void product warranty.
DANGER
When installing the vent system, all applicable naonal and local codes must be
followed. If you install thimbles, fire stops or other protecve devices and they
penetrate any combusble or noncombusble construcon, be sure to follow all
applicable naonal and local codes.
CAUTION
The micro-boiler must be vented in accordance with the secon “Venng of Equipment" of the latest
edion of the Naonal Fuel Gas Code: ANSI Z223.1/NFPA 54 in the United States and/or Secon 7 of the
CAN/CSA B149.1 Natural Gas and Propane Installaon Code in Canada, as well as applicable local building
codes.
The use of venng materials approved for Category III/IV appliances is recommended whenever possible.
However,the micro-boiler may also be vented with plasc pipe materials such as ABS, PVC,CPVC,or
Polypropylene. For details, please refer to the Exhaust Vent (ABS, PVC, CPVC, or Polypropylene Vent)
secon on p. 11. Vent installaons in Canada which ulize plasc vent systems must use venng that
complies with ULC S636.
General rules for venng micro-boiler are:
• Place the micro-boiler as close as possible to the vent terminaon.
• The vent collar of the micro-boiler must be fastened directly to an unobstructed vent pipe.
• Do not weld the vent pipe to the micro-boiler’s vent collar.
• Do not cut or alter the vent collar of the micro-boiler.
• The vent must be easily removable from the top of the micro-boiler for normal service and
inspecon of the unit.
• Avoid using an oversized vent pipe or using extremely long runs of the pipe.
• For rooop venng,a rain cap or other form of terminaon that prevents rain water from
entering into the micro-boiler must be installed.
• Do not terminate the vent into a chimney. If the vent must go through the chimney,the vent
must run all the way through the chimney with approved vent pipe.
General rules for vent terminaons:
• Avoid locang the micro-boiler vent terminaon near any air intake devices. These fans can
pick up the exhaust flue products from the micro-boiler and return them to the building. This
can create a health hazard.
• Locate the vent terminaon so that it cannot be blocked by any debris, at any me.Most codes
require that the terminaon be at least 12 inches (305 mm) above grade, but the installer may
determine if it should be higher depending on the job site condion and applicable codes.
• A proper sidewall terminaon is recommended when the micro-boiler is vented through a
sidewall.
• Regarding the clearances from the exhaust terminaon to the air inlet or opening,refer to p. 17
to 19.

11 Page
-Exhaust vent (ABS, PVC, CPVC, or polypropylene vent)-
The micro-boiler can be vented with ABS, PVC, CPVC, or polypropylene (temperature rated up to at
least 149 °F). Vent material cerfied to ULC S636 standards is recommended in the USA. In Canada,
plasc venng must be cerfied to ULC S636 standards.
• The maximum length of exhaust vent piping must not exceed 70 . (21.3 m) for 3” venng, which
depends on the elevaon where the micro-boiler is installed, and 100 . (30.5 m) for 4” venng
(deducng 5 . (1.5 m) for each elbow used in the venng system). Do not use more than 5
elbows. See the table below.
• When the horizontal vent run exceeds 5 . (1.5 m), support the vent run at 3 . (0.9 m) intervals
with overhead hangers.
Item Material United States Canada
Exhaust pipe and
Fings
Schedule 40 PVC ANSI/ASTM D1785
ULC S636 Cerfied
Materials Only
PVC-DWV ANSI/ASTM D2665
Schedule 40 CPVC ANSI/ASTM F441
Schedule 40 ABS-DWV ANSI/ASTM D2661
Polypropylene UL-1738
Pipe Cement/Primer
PVC ANSI/ASTM D2564
CPVC ANSI/ASTM F493
ABS ANSI/ASTM D2235
NOTE: Do NOT Use Cellular Foam Core Pipe
*For each elbow added, deduct 5 . (1.5 m) from max. vent length.
For details on the vent connecon, refer to p. 13 to 16.
No. of
Elbow
2" venng 3" venng 4" venng
Up to 3,000 Up to 3,000 Up to 6,000 Up to 10,100 Up to 10,100 
0 6.5 . (2.0 m) 70 . (21.3 m) 40 . (12.2 m) 25 . (7.6 m) 100 . (30.5 m)
1 1.5 . (0.5 m) 65 . (19.8 m) 35 . (10.7 m) 20 . (6.1 m) 95 . (29.0 m)
2 N/A 60 . (18.3 m) 30 . (9.1 m) 15 . (4.6 m) 90 . (27.4 m)
3 N/A 55 . (16.8 m) 25 . (7.6 m) 10 . (3.0 m) 85 . (25.9 m)
4 N/A 50 . (15.2 m) 20 . (6.1 m) 5 . (1.5 m) 80 . (24.4 m)
5 N/A 45 . (13.7 m) N/A N/A 75 . (22.9 m)
Excludes vent terminators, terminaon elbows, or rain caps.
Max. Vercal or Horizontal (Total) Vent Lengh

12 Page
-DIPswitch sengs for Vent length-
Vent length Two-pipe and Single pipe
5 to 50 .
(DEFAULT) No. 6 : ON
No. 7 : OFF
51 to 100 .
No. 6 : OFF
No. 7 : OFF
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
1 2 3 4 5 6 7 8 9 10
Vent length Two-pipe
5 to 20 .
(DEFAULT) No. 6 : ON
No. 7 : OFF
21 to 40 .
No. 6 : OFF
No. 7 : OFF
41 to 70 .
No. 6 : ON
No. 7 : ON
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
1 2 3 4 5 6 7 8 9 10
Set DIPswitches shown in the tables below depending on the vent length. Only adjust switches with a black
square. Black squares indicate the posion of the switch.
Vent length Single pipe
5 to 45 .
(DEFAULT) No. 6 : ON
No. 7 : OFF
46 to 70 .
No. 6 : OFF
No. 7 : OFF
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
1 2 3 4 5 6 7 8 9 10
Vent length Single pipe
5 to 6.5 .
No. 6 : ON
No. 7 : ON
OFF
ON
1 2 3 4 5 6 7 8 9 10
2 inch venng
3 inch venng
4 inch venng

13 Page
Typical using ABS, PVC, CPVC, or polypropylene vent
2 inch vent
For details of the oponal items, refer to the Installaon manual for each oponal item.
Single pipe with room-air intake
Terminaon
Hanger
1. Connect a 3" elbow directly on the
intake vent collar of the micro-boiler.
2. Connect a 3" x 2" reducer directly on
the exhaust vent collar of the micro-
boiler.
Make sure the couplings engage
the o-rings installed in the intake
and exhaust vent collars
3. Connect a 2" straight pipe to
the reducer.
Vent connecons for single pipe
*The micro-boiler came with a metal screen
that will fit into a 3 inch elbow.
* 3" elbow with bird
screen
Intake vent
collar
(Female)
3"x2" reducer
2" straight pipe
Exhaust vent
collar (Female)
Refer to pages 17 and 19 for clearance informaon

14 Page
3 inch vent
1. Connect a 3" elbow directly on the
intake vent collar of the micro-boiler.
2. Connect a 3" coupling directly on the
exhaust vent collar of the micro-boiler.
Make sure the couplings engage
the o-rings installed in the intake
and exhaust vent collars
3. Connect a 3" straight pipe to
the coupling.
3"coupling
Exhaust
vent collar
(Female)
3" straight pipe
3" coupling
Intake vent
collar
(Female)
3" straight pipe
1. Connect 3" couplings directly on
the exhaust and intake vent collar
of the micro-boiler.
Make sure the couplings engage
the o-rings installed in the intake
and exhaust vent collars
2. Connect 3" straight pipes to the
couplings.
For details of the oponal items, refer to the Installaon manual for each oponal item.
Vent connecons for two-pipe Vent connecons for single pipe
3" coupling
3" straight pipe
Exhaust
vent collar
(Female)
* 3" elbow with
bird screen
Intake vent
collar
(Female)
*The micro-boiler came with a metal screen
that will fit into a 3 inch elbow.
For details of the oponal items, refer to the Installaon manual for each oponal item.
1. Connect 3"x 4" increasers
directly on the exhaust and intake
vent collar of the micro-boiler.
Make sure the couplings engage
the o-rings installed in the intake
and exhaust vent collars
2. Connect 4" straight pipes to
the increasers.
4" straight
pipe
3"x4" increaser
Exhaust
vent
collar
(Female)
Intake vent
collar
(Female)
4" straight
pipe
3"x4"
increaser
4" straight pipe
3"x4" increaser
Exhaust vent
collar (Female)
* 3" elbow with
bird screen
Intake vent
collar
(Female)
1. Connect a 3" elbow directly on the
intake vent collar of the micro-boiler.
2. Connect a 3"x 4" increaser directly on
the exhaust vent collar of the micro-
boiler.
Make sure the couplings engage
the o-rings installed in the intake
and exhaust vent collars
3. Connect a 4" straight pipe to
the increaser.
Vent connecons for two-pipe Vent connecons for single pipe
*The micro-boiler came with a metal screen
that will fit into a 3 inch elbow.
4 inch vent

15 Page
Two-pipe, direct-vent Single pipe with room-air intake
Terminaons
Wall
Hanger
Hanger
Roof
Roof flashing
Fire stop
Terminaon
Wall
Hanger
Roof flashing
Fire stop
Roof
Refer to pages 17 and 19 for clearance informaon
Examples of of 3 inch & 4 inch vent

16 Page
Vent for two-pipe
4" stainless
steel vent
straight pipe
Exhaust vent
collar (Female)
Intake vent collar
(Female)
4" stainless
steel vent
straight pipe
Exhaust vent
collar (Female)
4" stainless
steel vent
straight pipe
Intake vent
collar
(Female)
4" elbow
with bird
screen
1. Connect a 4" stainless steel vent
straight pipes directly on the
exhaust vent collar of the
micro-boiler.
2. Connect a 4" elbow directly
on the intake vent collar of the
micro-boiler.
1. Connect 4" stainless steel vent
straight pipes directly on the
exhaust/intake vent collar of the
micro-boiler.
For details of the oponal items, refer to the Installaon manual for each Oponal item.
-Exhaust vent (Stainless steel vent)-
This is a Category IV appliance and must be vented accordingly. The vent system must be sealed airght.
All seams and joints without gaskets must be sealed with high heat resistant silicone sealant or UL listed
aluminum adhesive tape having a minimum temperature rang of 160 °F. For best results, a vent system
should be as short and straight as possible.
• The micro-boiler is a Category IV appliance and must be vented accordingly with any 4 inch vent
approved for use with Category III/IV or Special BH type gas vent.
• The manufacturer recommends the NovaVent (Z-Vent) line. However, the following are also UL
listed manufacturers: ProTech Systems Inc. (FasNSeal), Metal-Fab Inc., and Heat-Fab Inc. (Saf-T
Vent).
• Follow the vent pipe manufacturer’s instrucons when installing the vent pipe.
• The maximum length of exhaust vent piping must not exceed 100 . (30.5 m) (deducng 5 . (1.5
m) for each elbow used in the venng system). Do not use more than 5 elbows.
• When the horizontal vent run exceeds 5 . (1.5 m), support the vent run at 3 . (0.9 m) intervals
with overhead hangers.
Diameter Max. No. of Elbows Max. Vercal and Horizontal (Total) Vent Length
4 in. (102 mm) 5 100 . (30.5 m )
*For each elbow added, deduct 5 . (1.5 m) from max. vent length.
No. of Elbows Max. Vercal or Horizontal Vent Length
0 100 . (30.5 m)
1 95 . (29.0m)
290 . (27.4 m)
3 85 . (25.9 m)
480 . (24.4 m)
5 75 . (22.9 m)
Excludes vent terminators, terminaon elbows, or rain caps.
Vent for single pipe

17 Page
Canada U.S.A
Direct-vent and other
than Direct-vent
Direct-
vent
Other than
Direct-vent
AClearance above grade, veranda, porch, deck, or
balcony 1 foot 1 foot 1 foot
B Clearance to window or door that may be opened 3 feet 1 foot
4 feet from below or
side opening. 1 foot
from above opening
C Clearance to permanently closed window * * *
D
Vercal clearance to venlated soffit located above
the vent terminator within a horizontal distance
of 2 feet (61cm) from the center line of the
terminator
* * *
E Clearance to unvenlated soffit * * *
F Clearance to outside corner * * *
G Clearance to inside corner * * *
HClearance to each side of center line extended
above meter/regulator assembly 3 feet * *
I Clearance to service regulator vent outlet 3 feet * *
J
Clearance to non-mechanical air supply inlet to
building or the combuson air inlet to any other
applicaon
3 feet 1 foot
4 feet from below or
side opening. 1 foot
from above opening
K Clearance to mechanical air supply inlet 6 feet 3 feet 3 feet
LClearance above paved sidewalk or paved driveway
located on public property 7 feet * 7 feet
M Clearance under veranda, porch deck, or balcony 1 foot * *
*For clearances not specified in ANSI Z223.1 / NFPA 54 or CAN/CSA-B149.1, please use clearances in accordance
with local installaon codes and the requirements of the gas supplier.
INSIDE CORNER DETAIL
V
Gas meter / regulator
V
V
V
V
V
V
V
V
V
X
X
X
Vent terminal
Air supply inlet
Area where is not permied
G
A
E
D
B
L
C
F
B
B
B
BA
J
OPERABLE FIXED
CLOSED
B
H
M
K
OPERABLE
FIXED
CLOSED
I

18 Page
For mulple sidewall exhaust terminaons, an exhaust
terminaon must be at least 1 . (305mm) away from
another exhaust terminaon. An exhaust terminaon
must also be at least 2 . (610 mm) away from an inside
corner. (If the adjacent wall is less than 2 . (610 mm) of
length, the minimum required distance away from the
inside corner will be equal to the length of that adjacent
wall.)
Exhaust
terminaon
Inside
corner
1 .
(305 mm) min.
2 .
(610 mm)min.
1 . (305 mm)
min.
For mulple, direct-vent sidewall terminaons that
combine the intake and exhaust into a single penetraon,
space each direct-vent terminaon at least 1 . (305 mm)
away from each other,no maer the orientaon. A direct-
vent terminaon must also be at least 2 . (610 mm) away
from an inside corner. (If the adjacent wall is less than 2 .
(610 mm) of length, the minimum required distance away
from the inside corner will be equal to the length of that
adjacent wall.)
Combined
intake and
exhaust
terminaon
Inside
corner
1 .
(305 mm) min.
2 .
(610 mm)min.
1 . (305 mm)
min.
For direct-vent sidewall
terminaons that use two
separate penetraons for
the intake and exhaust,
keepthe terminaon
clearances shown in the
diagrams on the right.
Exhaust
Intake
(305 mm)
min.
Exhaust
Intake
A
A
<Case 2>
Exhaust
Intake
min.
Exhaust Intake
A
<Case 1>
A
A: 0.5 . (159mm)
The clearance of A is recommended on the basis of the structure of the micro-boiler.
* 3inch and 4 inch vent installaons only

19 Page
<For
Exhaust and/or direct-vent sidewall terminaons should
be at least 2 . (610 mm) away from an opposite surface/
wall. Do not place the terminaon directly in front of an
opening into a building.
Intake air Exhaust gas
BA
Intake air
BB
A
Exhaust
Gas
A:Exhaust terminaons must be at least 1 . (305 mm) away from any obstrucons.
B:Intake terminaons must be at least 1 . (305 mm) away from any obstrucons.
Exhaust
terminaon
2.(610 mm)
min
Please follow all local and naonal codes in regards to proper terminaon
clearances. In the absence of such codes, the clearances above can be used as
guidelines. Local codes supersede these guidelines.
CAUTION

20 Page
GAS SUPPLY AND GAS PIPE SIZING
-General-
• The minimum and maximum inlet gas pressures are:
• Inlet gas pressures that fall outside the range of values listed above may adversely affect the
performance of the micro-boiler. These pressures are measured when the micro-boiler is in full
operaon.
• Inlet gas pressure must not exceed the above maximum values; gas pressure above the specified range
will cause dangerous operang condions and damage to the micro-boiler.
• Unl tesng of the main gas line supply pressure is completed, ensure the gas line to the micro-boiler
is disconnected to avoid any damage to the micro-boiler.
1. Install a manual gas shutoffvalve between the micro-boiler and the gas supply line. The gas supply
line shall be checked for leaks using code approved methods.
2. When the gas connecons are completed, it is necessary to perform a gas leak test either by applying
soapy water to all gas fings and observing for bubbles or by using a gas leak detecon device.
• The micro-boiler and its individual shutoffvalve must be disconnected from the gas supply
piping system during any pressure tesng of that system at test pressures in excess of 1/2 psi
(3.5 kPa).
• The micro-boiler must be isolated from the gas supply piping system by closing its individual
manual shutoffvalve during any pressure tesng of the gas supply piping system at test
pressures equal to or less than 1/2 psi (3.5 kPa).
3. Always purge the gas line of any debris and/or water before connecng to the gas inlet.
Size the gas pipe appropriately to supply the necessary volume of gas required
for the micro-boiler using ANSI Z223.1/NFPA 54 in the USA or CAN/CSA B149.1 in
Canada or local codes. Otherwise, flow capabilies and output temperatures will
be limited.
NOTICE
Gas type Inlet gas pressure
Natural Gas Min. 5.0” W.C. (1.24 kPa) – Max. 10.5” W.C. (2.61 kPa)
Propane Min. 8.0” W.C. (1.99 kPa) – Max. 14.0” W.C. (3.48 kPa)
• Check that the type of gas matches the rang plate first.
• Ensure that any and all gas regulators used are operang properly and
providing gas pressures within the specified range shown below. Excess gas
inlet pressure may cause serious accidents.
• Conversion of this micro-boiler from natural gas to propane or vice versa will
void all warranty. Contact your local distributor to get the correct unit for your
gas type. The manufacturer is not liable for any property and/or personal
damage resulng from gas conversions.
CAUTION