Intergas HSE-125-N Manual

PN7331833
Model: HSE – 125 – N/P
Gas-fired Condensing Boiler and
Instantaneous Water Heater
INSTALLATION AND SERVICE MANUAL
Allied Engineering Company
Division of E-Z-Rect Manufacturing Ltd.
Manufacturers of Gas and Electric Boilers, Stainless Steel Tanks, Heat Exchangers and Electric Boosters.
94 Riverside Drive, North Vancouver, BC V7H 2M6 •Tel: [phone] •www.alliedboilers.com
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 neighbor’s phone. Follow the gas supplier’s
instructions.
- If you cannot reach your gas supplier, call the fire department.
•
Installation and service must be performed by a qualified installer, service agency or the gas
supplier.
•Improper, installation, adjustment, alteration, service or maintenance can cause
property damage,
personal injury or loss of life. Read all instructions before installation or service.
•Save this manual for future reference.
EEV 246473

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Table of Contents
Section Page
About Our Manuals...................................................................................................................................... 5
Abbreviations and Names Used .................................................................................................................. 5
Icons ............................................................................................................................................................ 5
Technical Support........................................................................................................................................ 5
Technical Specifications .............................................................................................................................. 6
Major Components ...................................................................................................................................... 7
Dimensions .................................................................................................................................................. 8
Description of Appliance .............................................................................................................................. 9
Section 1 – Installation Instructions ...................................................................................................... 10
1.1 Receiving, Moving and Unpacking................................................................................................ 10
1.2 Installation Codes and Requirements ........................................................................................... 10
1.3 Location and Installations ............................................................................................................. 11
1.3.1 Location ........................................................................................................................................ 11
1.3.2 Minimum Service Clearances ....................................................................................................... 11
1.3.3 Installation in a Kitchen Cupboard or Closet ................................................................................. 11
1.3.4 Installation in an Airing Cupboard or Closet.................................................................................. 11
1.3.5 Remove Front Panel ..................................................................................................................... 12
1.3.6 Mounting ....................................................................................................................................... 12
1.3.7 Install the Condensate Trap.......................................................................................................... 13
1.4 Water Piping Systems................................................................................................................... 13
1.4.1 CH Piping System (Boiler) ............................................................................................................ 13
1.4.1.1 CH Piping Connections................................................................................................................. 13
1.4.1.2 Pressure Relief Valve ................................................................................................................... 15
1.4.1.3 Manual Shutoff Valves .................................................................................................................. 15
1.4.1.4 Expansion Tank and Make-Up Water ........................................................................................... 15
1.4.1.5 System Bypass and Pressure Head Losses ................................................................................. 15
1.4.1.6 Corrosion Prevention (Internal)..................................................................................................... 16
1.4.2 DHW Piping System (Water Heater)............................................................................................. 16
1.4.2.1 DHW Piping Connections ............................................................................................................. 16
1.4.2.2 DHW Piping with a Backflow Preventer ........................................................................................ 16
1.4.2.3 Pressure Relief Valve or Temperature and Pressure Relief Valve ............................................... 17
1.4.2.4 Cathodic Protection Devices......................................................................................................... 17
1.4.3 Appliance Used with Solar System ............................................................................................... 17
1.5 Gas Service Piping ....................................................................................................................... 17
1.6 Electric Connection ....................................................................................................................... 18
1.7 Venting and Combustion Air ......................................................................................................... 20
1.7.1 Corrosive Atmosphere .................................................................................................................. 21
1.7.2 Air Intake System.......................................................................................................................... 21
1.7.3 Exhaust Vent System.................................................................................................................... 21
1.7.4 Vent Terminal Information............................................................................................................. 22
1.7.5 Direct Vent Configurations ............................................................................................................ 25
1.7.5.1 Twin Tube to Appliance Connection ............................................................................................. 25
1.7.5.2 Concentric to Appliance Connection............................................................................................. 25
1.7.6 Equivalent Vent/Air Intake Tube Length and Diameters ............................................................... 26
1.7.7 Example of 3 Inch (80 mm) Diameter Twin Tube Calculation....................................................... 26
1.7.8 Example of 3/5 Inch (80 mm/125mm) Diameter Concentric Tube Calculation ............................. 26
1.7.9 Vent Installations........................................................................................................................... 27

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1.7.9.1 Horizontal Twin Tube Side Venting with a Combined Terminal Cap............................................. 28
1.7.9.2 Horizontal Twin Tube Side Venting with Twin Terminal Caps ...................................................... 29
1.7.9.3 Vertical (Roof Top) Twin Tube Venting with Twin Terminal Caps................................................. 29
1.7.9.4 Vertical (Roof Top) Twin Tube Venting with Air Supply from Side Wall ........................................ 29
1.7.9.5 Concentric Connections with a Combined Terminal Cap.............................................................. 30
Section 2 – Controller.............................................................................................................................. 32
2.1 Controller Operation...................................................................................................................... 32
2.2 PC Interface.................................................................................................................................. 35
2.3 Test Programs and Frost Protection ............................................................................................. 35
2.3.1 Test Programs .............................................................................................................................. 35
2.3.2 Frost Protection............................................................................................................................. 35
2.4 Setting and Adjustment................................................................................................................. 36
2.4.1 User Parameter Settings............................................................................................................... 36
2.4.2 Installer Parameter Settings.......................................................................................................... 37
2.4.3 Setting and Description of Parameters ......................................................................................... 38
2.4.4 Setting CH and DHW Operating Input Rating ............................................................................... 39
2.4.5 Pump Head and Pressure Drop of CH H.E................................................................................... 39
2.4.6 Outdoor Reset Function................................................................................................................ 40
Section 3 – Startup Instructions............................................................................................................. 41
3.1 CH System Operating Requirements............................................................................................ 41
3.2 Pre-Startup ................................................................................................................................... 41
3.2.1 CH System.................................................................................................................................... 41
3.2.2 DHW System ................................................................................................................................ 42
3.2.3 Gas Supply ................................................................................................................................... 42
3.3 Startup .......................................................................................................................................... 42
3.3.1 Lighting Instructions ...................................................................................................................... 43
3.3.2 Startup Instructions ....................................................................................................................... 44
3.3.3 Sequence of Control Operation .................................................................................................... 44
3.4 Check Burner System ................................................................................................................... 45
3.5 Conversion to Propane ................................................................................................................. 46
3.6 Setting of Gas-Air Ratio ................................................................................................................ 46
3.6.1 Adjust the Gas-Air Ratio by Measuring the CO
2
Percentage of the Flue ...................................... 47
3.7 Appliance for Use at High Altitude ................................................................................................ 48
3.8 Check Input Rating ....................................................................................................................... 49
3.9 Check for Controls ........................................................................................................................ 49
3.10 Check for Gas Leaks .................................................................................................................... 49
3.11 Check the Condensate Trap ......................................................................................................... 49
3.12 Installer’s Checklist ....................................................................................................................... 50
Section 4 – Service & Maintenance Instructions .................................................................................. 51
4.1 Service & Maintenance Instructions.............................................................................................. 51
4.2 Service Procedure ........................................................................................................................ 51
4.2.1 Check Appliance Area .................................................................................................................. 51
4.2.2 Inspect the Condensation Trap and Discharge Tube.................................................................... 52
4.2.3 Check the Water and Gas Piping Systems................................................................................... 52
4.2.4 Check the Pressure Relief Valves ................................................................................................ 52
4.2.5 Check all Wiring............................................................................................................................ 52
4.2.6 Service the Venting System.......................................................................................................... 52
4.2.7 Service the Heat Exchanger if necessary ..................................................................................... 53
4.2.8 Check the Operation of the Appliance .......................................................................................... 53
4.2.8.1 Check the Control Settings ........................................................................................................... 53

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4.2.8.2 Check the Gas-Air Ratio ............................................................................................................... 53
4.2.8.3 Check Burner Flame..................................................................................................................... 53
4.2.9 Completion of Inspection and Service .......................................................................................... 54
4.2.10 Review the Service with Owner .................................................................................................... 54
4.3 Service Checklist .......................................................................................................................... 55
4.4 Caution: Water Replenishment ..................................................................................................... 56
4.5 Refractory Handling Procedure..................................................................................................... 56
Section 5 – Replacement Parts............................................................................................................... 57
Section 6 – Troubleshooting Guide ....................................................................................................... 58
6.1 Possible Problems and Solutions ................................................................................................. 58
6.2 Burner Fails to Ignite..................................................................................................................... 59
6.3 Burner Ignites with Noise.............................................................................................................. 60
6.4 Burner Resonates......................................................................................................................... 60
6.5 No Heating (CH) ........................................................................................................................... 61
6.6 Reduced Output............................................................................................................................ 61
6.7 CH Supply Water Does Not Reach Correct Temperature............................................................. 62
6.8 No Domestic Hot Water (DHW) .................................................................................................... 62
6.9 Domestic Hot Water Does Not Reach Correct Temperature ........................................................ 63
6.10 NTC Temperature Sensors Data .................................................................................................. 63
Section 7 – Notes..................................................................................................................................... 64

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ABOUT OUR MANUALS
Your Super Hot Intergas appliance has been provided with two manuals:
•User's Information Manual - This manual is intended for the owner or user of the appliance and
provides information on routine operation and maintenance, and emergency shutdown.
•Installation and Service Manual - This manual must only be used by a qualified heating installer,
service technician or gas supplier. Installation or service by anyone unqualified to do so may
result in severe personal injury, death or substantial property damage.
Both manuals should be kept in the envelope provided and affixed adjacent to the appliance so that they
are readily available for future reference.
ABBREVIATIONS AND NAMES USED
Description Referred to as
HSE condensing boiler and water heater Appliance
Central heating CH
Domestic hot water DHW (also HW)
Appliance with piping for central heating (boiler) CH system
Appliance with piping for domestic hot water heating DHW system
ICONS
The following symbols may be used in this manual:
DANGER
DANGER indicates a potentially hazardous situation which, if not avoided, will
result in death or serious injury.
WARNING
WARNING indicates a potentially hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION
CAUTION indicates a potentially hazardous situation which, if not avoided, could
result in minor or moderate injury.
CAUTION
CAUTION indicates a potentially hazardous situation which, if not avoided, may
result in property damage.
NOTICE
Special instructions which are important but not related to personal injury or
property damage.
TECHNICAL SUPPORT
For information about specific adjustments, installation, maintenance and repair activities, please contact
Allied Engineering Company.

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TECHNICAL SPECIFICATIONS
HSE-125-N HSE-125-P
Technical data
Natural Gas Propane
CH (central heating – BOILER)
Nominal input rate* 1000 Btu/h (kW) 28.7 – 124 (8.4 – 36.3)
Nominal output rate 1000 Btu/h (kW) 27.3 – 118 (8.0 – 34.5)
AFUE % 95
Maximum CH operating pressure psi (bar) 43 (3.0)
Maximum CH operating temperature °F (°C) 194 (90)
DHW (domestic hot water – HEATER)
Nominal input rate* 1000 Btu/h (kW) 28.7–124 (8.4 – 36.3)
Nominal output rate 1000 Btu/h (kW) 25.3 – 109 (7.4 – 31.9)
Energy Factor** 0.88 0.91
DHW minimum flow rate USGPM (l/min) 0.53 (2.0)
DHW continuous delivery at 135°F (with 77 ºF water temperature rise) USGPM (l/min) 2.8 (10.7)
DHW continuous delivery at 120 °F ( with 60 ºF water temperature rise) USGPM (l/min) 3.6 (13.7)
Maximum DHW temperature °F (°C) 150 (65)
Electrical data
Mains voltage / frequency Vac / Hz 120 / 60
Consumed power: full load W 110
Consumed power: standby W 10
Overall dimensions and weight
Height inch (mm) 31.9 (810)
Width inch (mm) 17.7 (450)
Depth inch (mm) 10.6 (270)
Weight lbs (kg) 86 (39)
Connections
CH supply inch NPT male ¾
CH return inch NPT male ¾
DHW supply inch NPT male ½
Cold water for DWH inch NPT male ½
Gas inch NPT male ½
Condensate drain flexible pipe, outside diameter inch (mm) 1 (25)
Air supply inlet (without adapter installed) mm 80
Flue gas outlet (without adapter installed) mm 80
Air supply inlet with adapter installed inch 3
Flue gas outlet with adapter installed inch 3
* The CH & DHW input rate is set to 100 % by default (see Setting CH & DHW input rating).
** The energy factor (EF) is the ratio of energy delivered to the water as compared to the total energy consumed.
Note: NPT = National Pipe Thread

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A CH pump M Flue discharge
B Gas valve N Wiring connecting block / terminal
C Burner controller with operating panel O Condensate discharge
D Supply sensor S1 P DHW sensor S3
E Return sensor S2 Q Condensate trap
F Blower R Heat exchanger
G DHW Flow switch S Operating and display panel
H CH Pressure gauge T Ionisation/ignition probe
I N/A U Front cover fixing screw
J CH manual air vent V High limit (not shown)
K Sight glass and mirror for checking flame W Flue sensor (not shown)
L
Air supply
Additional Components (supplied with appliance)
1 Compression fittings for CH pipes 4 Wall mounting strip
2 Vent adapters - 80mm to 3” CPVC 5 Pressure relief valve, 30 psi
3 Outdoor sensor 6 Drain valve
Optional Accessories (ordered separately)
1 DHW kit - includes compression fittings 3 Propane conversion kit
for DHW pipes, 125 psi PRV, etc. 4 Mounting frame
2 Condensate Neutralization Kit 5 Computer interface cable for diagnostics
MAJOR COMPONENTS

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DIMENSIONS
17.7”
450mm
4.7”
120mm
10.6”
270mm
5.9”
150mm
31.9”
810mm
7.5”
190mm
2.6”
65mm
4.7”
120mm
3.5”
90mm
4.5”
115mm
7.9”
200mm
F
Y Z
Y, Z
Y
AECD
D,E
A,B,C
F
B
2.0”
50mm
1.2/1.4”[30/35mm]
10.6” [270mm]
2.6” [65mm]
2.0” [50mm]
5.3”
135mm
2.6”
65mm
2.6”
65mm
2.6”
65mm
2.6”
65mm
2.6”
65mm
3.2”
80mm
A= CH supply 22mm diameter pipe
(fitting is 22mm to 3/4" NPT male)
B= CH return 22mm diameter pipe
(fitting is 22mm to 3/4" NPT male)
C= Gas ½” NPT male
D= Cold water
for DHW
15 mm diameter pipe
(fitting is 15mm to ½" NPT male)
E= DHW 15 mm diameter pipe
(fitting is 15mm to ½" NPT male)
Y= Air supply inlet 80 mm diameter
(with vent adapter: 3”)
F= Condensate 1” (25mm) diameter flexible tube Z= Flue gas outlet 80 mm diameter
(with vent adapter: 3”)

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DESCRIPTION OF THE APPLIANCE
The Super Hot Intergas HSE is a combined high efficiency condensing boiler and instantaneous water
heater that is designed for providing Central Heating (CH) and/or Domestic Hot Water (DHW). The actual
required input rate for CH and DHW can be independently programmed lower than the maximum input
rate to match the user’s design heating load and required DHW supply. During operation, the input rate
will be automatically modulated to satisfy the central heating or domestic hot water demand.
The heat exchanger is constructed of two separated copper tube circuits (i.e. CH and DHW) embedded in
high-pressure cast aluminium. This design protects against corrosion by using copper tube to contain
system water and aluminium to condense flue gases. The DHW system eliminates typical standby heat
losses as compared to hot water tanks, isolates the domestic hot water from potential contamination as
compared to a single wall indirect tank or flat plate heat exchanger, and has a higher efficiency as
compared to a direct-fired hot water tank.
Because of the separated circuits for CH and DHW, the heating and the hot water supply operate
independently of each other. The hot water supply has priority over the central heating if both systems are
connected; they cannot work simultaneously. It is possible to use the appliance solely for hot water or
solely for heating with the unused system not connected. Also, the DHW circuit can be connected to a
storage hot water tank, but cannot be connected to a closed system (e.g. the coil of an indirect hot water
tank).
The appliance is equipped with an electronic controller to energize the pump, control the blower, open the
gas valve, ignite the burner, continuously monitor the flame and modulate the input rate to match the
current heat demand.
The appliance is certified as a direct vent (balanced flue) only. The combustion air supply and flue
discharge can be connected to the appliance by means of two separate pipes or a concentric connection.
The appliance must be wall mounted and can be mounted using either the supplied wall mounting strip or
the optional wall mounting frame. The frame provides the spacing needed for a large elbow when venting
through the sidewall on which it is mounted. Also, the frame can hold a square expansion tank and
allows piping to pass behind the appliance for a very compact installation. The wall mounting frame and
expansion tank are supplied separately.
The appliance is factory equipped for natural gas. An optional propane conversion kit, included with
conversion instructions, can be supplied upon request.
The appliance includes standard parts for connection to a central heating (CH) system. For connection to
domestic hot water heating (DHW) system, the DHW kit must be used with the appliance and can be
supplied upon request.
Using the appliance for any other application which is outside of the scope is not covered by the warranty.

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Figure 1 Appliance with parts
Installation Instructions Section 1
1.1 RECEIVING, MOVING AND UNPACKING
INSPECT SHIPMENT FOR POSSIBLE DAMAGE. All goods are carefully manufactured, inspected,
checked and packed by experienced workers. The manufacturer's responsibility ceases upon delivery of
goods to the carrier in good condition. Any claims for
damage and/or shortage in shipment or non-delivery must
be filed immediately against the carrier by the consignee.
Use care when receiving, moving and unpacking the
appliance. Dropping the appliance may cause damage and
prevent safe and proper operation. Only transport the
appliance using the right transportation equipment, such as
a hand truck with a fastening belt or special equipment for
maneuvering steps. During transportation, observing the
transportation markings on the packaging and securing the
appliance on the transportation equipment to prevent it
from falling off.
Unpacking the appliance and check the parts packaged in
the carton with the appliance. The appliance, mounting
strip, condensate trap, installation instructions and warranty
card are included in the carton. Refer to Figure 1.
1.2 INSTALLATION CODES AND REQUIREMENTS
All applicable national, provincial/state, and local codes, laws, regulations, and ordinances must be
followed. They expand on and take precedence over any recommendations in this booklet. Authorities
having jurisdiction shall be consulted before installations are made.
In Canada, the installation must conform to the requirements of the authority having jurisdiction or, in the
absence of such requirements, to the Natural Gas and Propane Installation Code (current edition),
CAN/CSA B149.1. All electrical wiring and grounding must be in accordance with the Canadian Electrical
Code, CSA C22.1 Part 1 (current edition) and applicable local codes.
In the United States of America, the installation must conform to the requirements of the authority
having jurisdiction or, in the absence of such requirements, to the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 (current edition). All electrical wiring and grounding must be in accordance with the
National Electrical Code, ANSI/NFPA 70 (current edition) and applicable local codes.
Where required by the authority having jurisdiction, follow the Standard for Controls and Safety Devices
for Automatically Fired Boilers, ANSI/ASME CSD-1 (current edition).
If there is any conflict in the above requirements, the more stringent requirement applies.
The installation and service must also conform to the additional requirements in this manual. If there is
any conflict with a requirement in this manual and a Code requirement, the Code requirement must be
followed.
The hot water distribution system must comply with all applicable codes and regulations. When replacing
an existing appliance, it is important to check the condition of the entire hot water distribution system to
ensure safe operation.
Some jurisdictions may require that flue condensate be neutralized prior to disposal because flue
condensate is very corrosive and will corrode most metals.

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Figure 2 Install in kitchen cupboard or
closed closet
1.3 LOCATION AND INSTALLATION
1.3.1 LOCATION
This appliance is intended for an indoor, wall hung installation using the wall mounting strip or
optional mounting frame. The appliance should be mounted on a wall with sufficient bearing
strength. In the case of light wall constructions, resonance sounds may occur.
In order to avoid freezing of the condensate discharge, the appliance should be installed in a
frost-free room.
A hot water boiler installed above radiation level, or as required by the authorities having
jurisdiction, must be provided with a low water cutoff device at the time of boiler installation.
This appliance must be installed such that gas ignition system components are protected from
water (dripping, spraying, rain, etc.) during appliance operation and service (circulator
replacement, condensate trap, control replacement, etc.).
Structure through which venting will pass must be free and clear for opening (i.e. no hidden
conduit, telephone cables or other obstructions).
1.3.2 MINIMUM SERVICE CLEARANCES
Minimum clearances from appliance casing to combustible materials are zero however
reasonable space must be provided for ventilation. Recommended minimum clearances for
service are listed in table 1.
Table 1 Recommended Minimum Service Clearances
Recommended Minimum Service Clearances
Left/right side
without piping
Left/right side
with piping
Rear Front Top Bottom
in. mm in. mm in. mm in. mm in. mm in mm
1 25 24 700 0 0 28 700 7 178 10 254
- Flue Vent Clearance = 1 inch (25 mm)
- Hot Water Pipe Clearance = 1 inch (25 mm)
1.3.3 INSTALLATION IN A KITCHEN CUPBOARD OR
CLOSET
Make sure there is sufficient ventilation above and
below the appliance.
When the appliance is placed in a small cupboard,
ventilation openings of at least 8 in
2
(50 cm
2
) must be
made. Refer to Figure 2.
1.3.4 INSTALLATION IN AN AIRING CUPBOARD OR
CLOSET
Compartment ventilation is not required for a
standard airing cupboard or closet (e.g. 24 x 24 x
91in high or 0.6 x 0.6 x 2.3m high).

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Figure
4
Wall mounting strip
Figure 3 Remove front cover
Figure 5 Mounting frame
1.3.5 REMOVE FRONT COVER
Remove the front cover on the appliance as follows,
refer to Figure 3:
1. Unscrew both screws (B) at the bottom of the
appliance.
2. Lift the front panel (C) and remove it forward.
1.3.6 MOUNTING
There are two types of mounting methods. Wall
mounting strip (A) is the standard appliance mounting
bracket and wall mounting frame (B) is an optional
mounting frame which holds a square expansion
tank. For mounting the appliance on the inside of an
external wall through which sidewall venting passes,
wall mounting frame (B) is recommended to provide
sufficient clearance for venting elbows.
Option One – Wall mounting strip (A) Only (Refer to Figure 4)
1. Use the screws and plugs supplied to fasten the bracket horizontally to the wall.
2. Hang the appliance by sliding it top-down over the standard mounting strip.
3. Install the parts of the various connecting sets.
Option Two – Mounting frame (B) (Refer to Figure 5)
1. Use the screws and plugs supplied to fasten the mounting frame (B) vertically to the wall.
2. Connect the expansion tank to the heating system before connecting appliance piping.
3. Hang the appliance by sliding it top-down over the mounting frame.
4. Install the parts of the various connecting sets.
B
A

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Figure 6 Install condensate trap
1.3.7 INSTALL THE CONDENSATE TRAP (Refer to Figure 6)
WARNING
Risk of exhaust gases escaping to the appliance room! The condensate trap must
always be filled with water or condensate so that it forms a liquid-filled trap. Check the
trap and, if low, fill it until water begins to pour out of the drain.
Install the condensate trap to the condensate outlet pipe
(C) and tighten union.
The flexible tube (A) from the condensate trap should be
inserted into an open waste pipe (B) of not less than 1-1/4
inch (32 mm) diameter or a neutralization unit. If connected
to a soil pipe or waste system, the waste pipe must have a
trap (similar to the arrangement for washing machine).
The condensate formed both in the appliance and the
venting system is collected in the collector at the bottom of
heat exchanger and is discharged into the public sewage
system through the condensate trap. The condensate
produced by the gas combustion products typically has a
pH value between 3 and 4. Some local codes may require
that the aggressive and corrosive condensate be
neutralized before discharging it into the public sewage
system. If a neutralization unit is installed, all condensate passes through the neutralization unit
and is neutralized to a pH value of above 6.5 before release to the public sewage system. It is
advisable to contact your local authority responsible for waste water regulations before
commencing with the installation of the neutralization unit.
The amount of neutralizer needed will depend on the operation of the appliance. To determine
the required refill amount, check granulate level several times throughout the year, or as
necessary. In some cases one granulate fill may last an entire year. Contact Allied Engineering
Company for a condensate neutralization kit when required.
Never use copper or steel/galvanized pipe in the construction of the condensate system. Route
condensate drain line in a manner such that any condensate leakage will not cause property
damage. Do not run flue condensate line outside. A frozen or blocked drain will cause the
condensate to fill the combustion chamber and cause the boiler shut down. When a condensate
pump is used or required, select a pump that is designed for pumping the condensate of
condensing residential furnaces (i.e. corrosion resistant).
1.4 WATER PIPING SYSTEMS
The water piping system of an appliance 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.
The appliance, when used in connection with a refrigeration system, must be installed so the chilled
medium is piped in parallel with the appliance with appropriate valves to prevent the chilled medium from
entering the appliance.
1.4.1 CH PIPING SYSTEM (BOILER)
1.4.1.1 CH PIPING CONNECTIONS (Refer to Figure 7)
1. Use the compression fittings supplied with the appliance to connect the heating system
supply and return pipes. Check whether the compression rings are straight in the connectors.

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Figure 7 Install piping systems
All pipes must be installed tension-free in order to avoid ticking of the pipes. The connections
must not be twisted in order to avoid leaks at the joint points.
2. The CH system is recommended with:
•A make up water loop in the system below the appliance as shown in figure 8.
•A drain tap at the lowest point of the system.
•An expansion tank (Follow section 1.4.1.4).
•A check valve when pipes are running upward at a short distance from the appliance.
This prevents gravity circulation during domestic hot water operation of the appliance.
3. Flush the CH system thoroughly after finishing the piping installation and purge trapped air.

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Figure 8 Example of make up water loop
1.4.1.2 PRESSURE RELIEF VALVE
WARNING
The pressure relief valve discharges pressurized hot water which can turn into steam.
Steam exiting the discharge outlet can explosively expand in all directions. Always
maintain a safe distance from the discharge pipe outlet in order to avoid potential
contact with exiting hot water or steam and injury.
A pressure relief valve is supplied as standard equipment. The pressure relief valve is extra
protection against damage that could be caused by malfunctioning controls or excessive water
pressure. The pressure relief valve is a code requirement. Field installation of the relief valve
must be consistent with the ANSI/ASME Boiler and Pressure Vessel Code, Section IV. The
manufacturer is not responsible for any water damage. If a pressure relief valve is not used, the
warranty is void.
The pressure relief valve should be installed on the boiler outlet with its spindle vertical. The
connection between the boiler and the relief valve must have at least the area of the relief valve
inlet. No valve should be installed between the pressure relief valve and the appliance or in the
discharge piping.
A discharge pipe should be used. The discharge pipe outlet should be positioned over a suitable
drain and so arranged that there will be no danger of being scalded. The discharge pipe must
pitch down from the valve and should be no smaller than the outlet of the valve. The end of the
discharge pipe should not be concealed or threaded and should be protected from freezing.
Extensive runs, traps or bends could reduce the capacity of the pressure relief valve.
1.4.1.3 MANUAL SHUTOFF VALVES (Refer to Figure 7)
Install the manual shut off valves on the supply and return pipes.
1.4.1.4 EXPANSION TANK AND MAKE-UP WATER
The boiler requires an expansion tank which is of
the adequate volume for the heating system. For
larger volume systems, an additional expansion
tank may be required. Consult heating system
engineer and the expansion tank manufacturer
for proper sizing information.
Install make-up water connections as per local
codes. If a pressure reducing valve is used as
shown in figure 8, adjust it to match the system
fill pressure. Also adjust the diaphragm type
expansion tank air pressure to match the system
fill pressure. In connecting the cold make-up
water supply to the appliance, make sure that
clean water supply is available. When the water
supply is from a well or pump, a sand strainer
should be installed at the pump.
1.4.1.5 SYSTEM BYPASS AND PRESSURE HEAD LOSSES
A bypass (primary/secondary piping) is not required for the safe operation of the appliance. It
may, however, be required in conjunction with certain controls on a heating system.
Pump head and pressure drop of the CH heat exchanger versus water flow rate are shown in
Figure 30. To confirm if the equipped pump meets the system pressure drop or requires an
additional system pump, the system pressure drop must be calculated by a qualified heating
system designer.

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0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 (bar)
2.9 5.8 8.7 11.6 14.5 17.4 20.3 23.2 26.1 29.0 (psi)
X
Y
15
13
11
9
7
5
3
1
4.0
(l/min)(gpm)
3.4
2.9
2.4
1.9
1.3
0.8
0.3
Figure 9 DHW flow rate vs. water pressure
1.4.1.6 CORROSION PREVENTION (Internal)
The use of oxygen barrier tubing is recommended to protect the system and its components (e.g. pump)
from corrosion. Should your system include "non-oxygen barrier” tubing please contact the factory or a
heating professional for recommendations.
If freeze protection is required, use an inhibited propylene glycol solution which is specifically designed for
hydronic heating systems and always maintained at a neutral pH (e.g. Fernox Alphi-11 or equivalent).
Follow the supplier’s instructions for proper use and maintenance. Do not use automotive antifreeze.
Some types of chemical additives can cause problems (e.g. accelerated corrosion, reduced efficiency,
etc.) and could result in premature failure of the boiler heat exchanger and/or system components,
especially when not properly used or maintained. Corrosion is a preventable condition and is not covered
by the product warranty.
1.4.2 DHW PIPING SYSTEM (WATER HEATER)
The appliance includes standard parts for connection to a central heating (CH) system. For
connection to domestic hot water heating (DHW) system, the DHW kit must be used with the
appliance and can be supplied upon request.
1.4.2.1 DHW PIPING CONNECTIONS
1. Piping and components connected to the water heater shall be suitable for use with potable
water.
2. Flush the hot and cold water system thoroughly to clean out metal powder, sand and dirt
before connecting it.
3. Use compression fittings supplied to connect the DHW supply and return pipes (refer to
Figure 7). Check whether the compression rings are straight in the connectors. All pipes must
be installed tension-free in order to avoid ticking of the pipes. The connections must not be
twisted in order to avoid leaks at the joint points.
4. Test that there are no water leaks from the cold and hot water supply pipes and then insulate
all water piping especially the hot supply and recirculation water lines, and cold water pipe
according to the climate of the region or local code to prevent the pipe from freezing. Do not
cover the drain or pressure relief valve.
When the appliance is used for hot water supply
only in the summer, the CH heating function can
be switched off with the service code on the
operating panel.
If the appliance is shutdown during the winter, the
domestic hot water and heating water loops
should be drained to prevent the pipes from
freezing. Also disconnect the make up water for
the CH heating loop and cold water for the
domestic hot water at the bottom of the
appliance.
Figure 9 shows the domestic hot water flow rate
versus the cold water pressure in the range of ±
10%.
1.4.2.2 DHW PIPING WITH A BACKFLOW PREVENTER
If the water heater is installed in a closed water supply system, such as one having a backflow
preventer in the cold water supply line, means shall be provided to control thermal expansion.
Contact the water supplier or local plumbing inspector on how to control this situation.

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1.4.2.3 PRESSURE RELIEF VALVE OR TEMPERATURE AND PRESSURE RELIEF VALVE
A pressure relief valve must be installed near the domestic hot water outlet. If the unit is
connected to a separate storage vessel, the separate vessel must have its own temperature and
pressure relief valve. The pressure relief valve or temperature and pressure relief valve must be
rated in accordance with and comply with the Standard for Relief Valves for Hot Water Supply
Systems, ANSI Z21.22/CSA 4.4 or the ANSI/ASME Boiler and Pressure Vessel Code, Section IV
(“Heating Boilers”).
The location of the relief valve shall be accessible for servicing or replacement. If a separate
storage vessel is installed, it shall have a tapping separate from the tapping for the water
connections to accommodate a temperature and pressure relief valve of adequate size to protect
the water heater. This tapping shall be clearly identified on Class III marking material and shall
be located in the top of the tank, or in the side of the tank on a centreline within the upper 6
inches of the top of the tank. The tapping shall be threaded in accordance with the Standard for
Pipe Threads, General Purpose (Inch), ANSI/ASME B1.20.1.
The maximum Btu/h discharge capacity of the pressure relief valve must be at least equal to the
maximum input rating of the water heater. The maximum relieving pressure setting must not
exceed 150 psi (10.3 bar). No valve shall be placed between the relief valve and the water
heater, relief valve and the storage tank, or in the discharge pipe as shown in figure 7.
Avoid contact with the hot water and steam discharged to prevent personal injury. The discharge
pipe outlet should be positioned over a suitable drain within 6” (152 mm) from the floor. It must
be arranged so that there will be no danger of being scalded and the hot water cannot splash on
anyone or nearby equipment.
The discharge pipe must pitch down from the valve and should be no smaller than the outlet of
the valve. The end of the discharge pipe should not be concealed or threaded and should be
protected from freezing. Extensive runs, traps or bends could reduce the capacity of the pressure
relief valve. No reducing coupling or other restriction can be installed in the discharge line.
If a relief valve discharges periodically, this may be due to thermal expansion in a close water
supply system. Contact the water supplier or local plumbing inspector on how to correct this
situation. Do not plug the relief valve.
1.4.2.4 CATHODIC PROTECTION DEVICES
When cathodic protection devices are used in the storage tank, hydrogen gas can be produced in
a hot water system that has not been used for a long period of time (generally two weeks or
more). Hydrogen gas is extremely flammable. To prevent the possibility of injury under these
conditions, we recommend the hot water faucet be open for several minutes at the kitchen sink
before you use any electrical appliance which is connected to the hot water system. If hydrogen is
present, there will probably be an unusual sound as air escaping through the pipe as the hot
water begins to flow. There should be no smoking or open flame near the faucet when it is open.
1.4.3 APPLIANCE USED WITH SOLAR SYSTEMS
This appliance is suitable for use with solar hot water systems and can be buffered using a Super
Hot storage tank or indirect hot water tank. Contact Allied Engineering Company for details.
1.5 GAS SERVICE PIPING
All piping and fittings must be installed as per codes in Section 1.2.
Make sure the gas on which the appliance will operate is the same as that specified on the appliance
rating plate. Do not install the appliance if equipped for a different type gas. Consult your gas supplier to
get gas information.
To prevent damage, care must be taken not to apply too much torque when connecting pipe fitting of gas
supply to gas inlet pipe on the appliance. A manual main shut-off valve must be installed in the gas line

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Figure 11 Open control panel
Figure 10 Sediment trap for gas line
outside the appliance jacket and as required in Section 1.2. The valve should be readily accessible for
turning on and off.
When a vertical section of gas piping is supplied on the upstream side of the gas controls, a drip pocket or
sediment trap must be installed at the inlet of gas connection to the appliance (in the gas supply line
upstream of the gas controls and as close to the appliance as possible), example shown in Figure 10.
The appliance and its gas connection must be leak tested before
placing the appliance in operation. The gas controls furnished
are suitable for a maximum operating gas pressure of 1/2 psi (14
inches water column/356 mm water column).
The appliance and its individual shutoff valve must be
disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess of 1/2
psig (14 inches water column/356 mm water column).
The appliance must be isolated from the gas supply piping
system by closing its individual manual shutoff valve during any
pressure testing at test pressures equal to or less than 1/2 psig
(14 in. water column/356 mm water column).
The pipe compound used should be resistant to the action of liquefied petroleum gases. Check for gas
leaks in piping, connection to appliance, and gas valve inlet before placing the appliance in operation by
using a soap and water solution. Also check for gas leaks at the gas valve outlet when the appliance is
on. DO NOT USE AN OPEN FLAME.
INSTALLER MUST IDENTIFY EMERGENCY SHUT-OFF DEVICES.
1.6 ELECTRICAL CONNECTION
WARNING
Electrical shock hazard can cause severe injury or death. Disconnect power before installing or
servicing.
The appliance requires a 120 Vac 60 Hz power supply, and must be grounded. All electrical
connections must be made in full accordance with the Code requirements listed in Section 1.2.
WARNING
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper
and dangerous operation. Verify proper operation after servicing.
Run a separate electrical circuit from the electrical service panel through a fused disconnect switch to the
appliance. This appliance must be electrically bonded to ground in accordance with the requirements of
the authority having jurisdiction (local codes) or, in the absence of such requirements, with the National
Electrical Code, ANSI/NFPA 70 (current edition) and/or the Canadian Electrical Code, CSA C22.1 Part 1
(current edition). Field wiring shall conform to Section 2.2 and to the temperature limitations of Type T
[63°F (35°C) rise or better.
Make wiring connections as follows:
1. Unscrew the screws (A) in order to gain access to the space of the
appliance controller (B). Refer to Figure 11.
2. The cover plate (display) hinges open downwards to access to the
controller and electrical connections.
3. Refer to electrical wiring diagram in Figure 12 to make the
electrical connections.
4. After making the required connections, replace the appliance
controller.

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A Ground terminal heat exchanger F Fuse (3.15A T) P1 CH pump S3 DHW sensor
B Cable of ignition/flame sensor G Gas valve R Resistor S5 Flow switch DHW
C Burner controller I Ionisation/Ignition probe S1 CH Flow sensor S7 High limit
E Ground terminals burner controller
M Power supply S2 CH Return sensor S8 Flue sensor
V Blower
Connector
X4 24V = 4-5
External economy switch (When using DHW comfort function “Eco” or “On”, 4 and 5 must
be closed)
6-7 On/off room thermostat 0.1A 24V= and/or Frost thermostat.
6-7-9 Power supply clock thermostat (6=positive, 7=switched live, 9=negative) 24V= max.3VA
8-9 Outdoor sensor 12kOhm/25°C
9-10
Sensor for indirect hot water tank (12kOhm/25°C)
-Installer parameter 1 must be set to 1. Installer parameter n must be set
-DHW sensor S3 must be disconnected.
-Tank temperature is set by User Parameter DHW temperature.
11-12 OpenTherm (When in use, 6-7 must be open)
Connector
X2 115V ~2-4 Power supply (2=Live, 4=Neutral)
7-8 CH pump (8=Live, 7=Neutral)
3-5-6 Valve floor heating (3=Live, 5=Switch live, 6=Neutral) (VC4011 Honeywell 115V~)
3-5-6 Three way valve (3=Live, 5=Switch live, 6=Neutral) (VC4011 Honeywell 115V~)
Connector
X5 PC interface
Figure 12 Control Wiring Diagram

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1.7 VENTING AND COMBUSTION AIR
DEFINITIONS
A direct vent (a balanced flue) appliance – an appliance that operates with all air for combustion
obtained from the outdoor atmosphere and all flue gases discharged to the outdoor atmosphere.
A non-direct vent appliance – an appliance that operates with all air for combustion obtained from the
boiler room and all flue gases discharged to the outdoor atmosphere.
This appliance is certified as a direct vent appliance only. The venting system must be installed in
accordance with this manual and the venting manufacturer’s certified installation instructions.
Provision for combustion and ventilation air must be met in accordance with Chapter 5.3, Air for
Combustion and Ventilation and Chapter 7, Venting of Equipment, of the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 in USA, and Section 7, Venting Systems and Air Supply for Appliances, of the Natural
Gas and Propane Installation Code, CAN/CSA B149.1 in Canada. Also, applicable provisions of the local
building codes must be followed. Contact local building or fire officials about restrictions and installation
inspection in your area. If there is any conflict in the above Code requirements, the more stringent
requirement applies.
For a direct vent appliance installation, sufficient air for ventilation in the appliance room or closet should
be provided from indoors to reduce the room air temperature.
The air supply and venting terminations must always be kept clear of obstructions (i.e. snow, ice, etc.).
The responsibility of providing a suitable venting and air intake tube of adequate draft capacity and in
good usable condition is that of the gas fitter/installer. Interference with the air supply for the appliance
shall be prohibited.
Removal of an Existing Boiler
When an existing appliance is removed from a common venting system, the common venting system is
likely to be too large for proper venting of the appliances connected to it.
At the time of removal of an existing appliance, the following steps shall be followed with each appliance
remaining connected to the common venting system placed in operation, while the other appliances
remaining connected to the common venting system are not in operation.
a) Seal any unused openings in the common venting system.
b) Visually inspect the venting system for proper size and horizontal pitch and determine there is no
blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe
condition.
c) Insofar as is practical, close all building doors and windows and all doors between the space in which
the appliances remaining connected to the common venting system are located and other spaces of
the building. Turn on clothes dryers and any appliance not connected to the common venting system.
Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at
maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
d) Place in operation the boiler being inspected. Follow the lighting instructions. Adjust the thermostat
so the appliance will operate continuously.
e) Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the
flame of a match or candle, or smoke from a cigarette, cigar or pipe.
f) After it has been determined that each appliance remaining connected to the common venting system
properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace
dampers and any other gas burning appliance to their previous conditions of use.
g) Any improper operation of the common venting system should be corrected so the installation
conforms with the National Fuel Gas Code, ANSI Z223.1 and/or the Natural Gas and Propane