UTICA BOILERS MAC-150 Instruction manual

P/N 240011317, Rev. F [03/31/2017]
Manufactured by:
ECR International, Inc.
2201 Dwyer Avenue, Utica NY 13501
web site: www.ecrinternational.com
CONDENSING WALL MOUNTED
GAS BOILER
INSTALLATION, OPERATION &
MAINTENANCE MANUAL
Models
MAC-150 COMBI
MAH-125 HEATING ONLY

2
INSTALLER Section
CONTENT
SAFETY INFORMATION ..............................................................................................................................................................................3
DEFINITIONS ...............................................................................................................................................................................................3
SPECIAL ATTENTION BOXES.....................................................................................................................................................................3
OTHER DEFINITIONS..................................................................................................................................................................................3
BEFORE INSTALLING AND WHEN SERVICING THE BOILER ..................................................................................................................4
DURING BOILER OPERATION....................................................................................................................................................................4
BOILER WATER ...........................................................................................................................................................................................4
FREEZE PROTECTION FLUIDS..................................................................................................................................................................4
HEATING APPLIANCE REMOVAL FROM A COMMON VENT SYSTEM.....................................................................................................5
CONDENSATE REMOVAL SYSTEM............................................................................................................................................................5
1. INTRODUCTION...........................................................................................................................................................................................6
2. TECHNICAL DATA........................................................................................................................................................................................6
2.1 PERFORMANCE ..........................................................................................................................................................................................6
2.2 PARAMETERS SETTING FOR HIGH ALTITUDE.........................................................................................................................................7
2.3 SYSTEM .......................................................................................................................................................................................................7
2.4 MAIN COMPONENTS ..................................................................................................................................................................................7
2.5 GENERAL INSTALLATION INFORMATION .................................................................................................................................................8
2.6 ELECTRICAL................................................................................................................................................................................................8
2.7 AVAILABLE PUMP HEAD FOR CENTRAL HEATING..................................................................................................................................8
2.8 SYSTEM VOLUME .......................................................................................................................................................................................9
2.9 BOILER SCHEMATIC ...................................................................................................................................................................................10
2.10 BOILER INFORMATION MENU ...................................................................................................................................................................12
3. GENERAL BOILER INFORMATION .............................................................................................................................................................13
SERVICE CLEARANCES .............................................................................................................................................................................13
3.1 SELECTING THE BOILER LOCATION ........................................................................................................................................................14
3.2 POSITIONING THE BOILER ........................................................................................................................................................................14
3.3 FIT THE BOILER...........................................................................................................................................................................................14
3.4 FLUSHING THE SYSTEM ............................................................................................................................................................................14
3.5 GAS SUPPLY................................................................................................................................................................................................14
3.6 ELECTRICAL SUPPLY .................................................................................................................................................................................15
3.7 AIR SUPPLY .................................................................................................................................................................................................15
3.8 DOMESTIC HOT WATER MODE .................................................................................................................................................................15
FOR Utica Boiler MAC-150 and MAH-125 WITH INDIRECT TANK .............................................................................................................15
3.9 FROST PROTECTION MODE......................................................................................................................................................................15
3.10 PUMP PROTECTION ...................................................................................................................................................................................15
3.11 GAS PIPING .................................................................................................................................................................................................15
4. VENT SYSTEM.............................................................................................................................................................................................16
INSTALLING EXHAUST VENT AND INTAKE AIR VENT..............................................................................................................................16
4.1 APPROVED VENTING MATERIAL...............................................................................................................................................................17
CONCENTRIC VENT SUPPORT .................................................................................................................................................................18
FLUE OPTIONS............................................................................................................................................................................................18
CONCENTRIC VENT SCREW PLACEMENT ..............................................................................................................................................19
SEPARATED HORIZONTAL FLUE TERMINALS INSTALLATION OPTIONS ..............................................................................................20
SEPARATED FLUE TERMINALS .................................................................................................................................................................20
TWO PIPE VENT SUPPORT........................................................................................................................................................................21
5. BOILER LOCATION......................................................................................................................................................................................24
6. CENTRAL HEATING SYSTEM .....................................................................................................................................................................24
7. FILLING THE CENTRAL HEATING SYSTEM ..............................................................................................................................................25
8. TOXIC CHEMICALS .....................................................................................................................................................................................26
9. HEATING SYSTEM AND REFRIGERATION................................................................................................................................................26
10. INSTALLATION .............................................................................................................................................................................................26
10.1 CONNECT THE PIPEWORK........................................................................................................................................................................26
11. ELECTRICAL CONNECTIONS.....................................................................................................................................................................26
11.1 CONNECTING THE 120 V ROOM THERMOSTAT ......................................................................................................................................26
11.2 CONNECTING THE 24 V ROOM THERMOSTAT....................................................................................................................................... 27
11.3 ACCESSORIES ............................................................................................................................................................................................27
12. SPECIAL FUNCTIONS .................................................................................................................................................................................30
12.1 COMMISSIONING ........................................................................................................................................................................................30
12.2 DE-AERATION FUNCTION ..........................................................................................................................................................................31
12.3 CHIMNEY SWEEP FUNCTION ....................................................................................................................................................................31
12.4 COMBUSTION ADJUSTMENT FUNCTION (CO2%) ....................................................................................................................................31
12.5 ERROR MESSAGES AND RESETTING THE BOILER................................................................................................................................32
13. OPERATING THE BOILER...........................................................................................................................................................................33
13.1 TESTING FOR GAS LEAKS AND PURGINING THE GAS SUPPLY ...........................................................................................................33
13.2 BOILER CONTROLS....................................................................................................................................................................................33
13.3 GAS VALVE...................................................................................................................................................................................................34
CHANGING THE TYPE OF GAS..................................................................................................................................................................34
14. PARAMETER SETTINGS .............................................................................................................................................................................34
14.1 ADJUSTING MAXIMUM HEATING POWER ................................................................................................................................................36
15. ANNUAL SERVICING...................................................................................................................................................................................36
15.1 HYDRAULIC UNIT ........................................................................................................................................................................................37
15.2 FINAL COMMISSIONING .............................................................................................................................................................................37
15.3 FINAL ASSEMBLY ........................................................................................................................................................................................38
15.4 USER INFORMATION ..................................................................................................................................................................................38
16. BOILER OPERATION ...................................................................................................................................................................................38
16.1 CENTRAL HEATING MODE .........................................................................................................................................................................38
16.2 DOMESTIC HOT WATER MODE .................................................................................................................................................................38
16.3 FROST PROTECTION..................................................................................................................................................................................38
16.4 PUMP............................................................................................................................................................................................................38
16.5 LWCO - LOW WATER CUT OFF .................................................................................................................................................................38
16.6 SAFETY FLUE THERMOSTAT....................................................................................................................................................................39
16.7 FLUE PRESSURE SWITCH.........................................................................................................................................................................39
16.8 REPLACEMENT OF PARTS.........................................................................................................................................................................39
AUTOMATIC CALIBRATION FUNCTION.....................................................................................................................................................39
17. ROUTINE SERVICING .................................................................................................................................................................................40
IMPORTANT NOTES PRIOR TO SERVICING.............................................................................................................................................40
18. COMPONENT REPLACEMENT AND PERIODIC CLEANING.....................................................................................................................41
18.1 DRAINING THE BOILER ..............................................................................................................................................................................41
18.2 ELECTRODES..............................................................................................................................................................................................41
19. WIRING DIAGRAMS.....................................................................................................................................................................................42
P/N 240011317, Rev. F [03/31/2017]
A.APPENDIX A - APPROVED TERMINATIONS OPTIONS.............................................................................................................................89

3
INSTALLER Section
Qualified Installer / Service Technician
Read all instructions in this manual, and the Boiler Venting section, before installation, servicing and maintenance. Perform
steps in the order given. Boiler installation shall be completed by qualified agency.
User
This manual is for use only by a qualified heating installer/service technician.
Refer to User's Information Manual for your reference.
Have this boiler serviced/inspected by a qualified service technician annually.
After the comissioning make sure you are advised, and shown if necessary, all important points as described in section 3:
"OPERATING THE BOILER".
SAFETY INFORMATION
DEFINITIONS
The following dened terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or
to important information concerning the product.
SPECIAL ATTENTION BOXES
DANGER
"DANGER" indicates an imminently 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.
If the information in this manual is not followed exactly, a fire or explosion may result causing personal injury or loss
of life.
CAUTION
"CAUTION" indicates a potentially damaging situation which, if not avoided, could result in minor injuries.
OTHER DEFINITIONS
Qualified Installer / Service Technician - any individual, firm, corporation or company that either directly or through a
representative is engaged in the installation, replacement, repair or servicing of gas piping, venting systems, appliances,
components, accessories, or equipment, and whose representative is either experienced and trained, in such work and has
complied with the requirements of the authority having jurisdiction.
MANUFACTURER ADVISES THAT ONLY CONTRACTORS TRAINED IN THE SPECIFIC DETAILS OF THIS PRODUCT
SHALL UNDERTAKE INSTALLATION.
Service - the supply, installation, or maintenance of goods carried out by a Qualified Installer / Service Technician.
Gas Supplier - A party that sells the commodity of Gas A (Natural Gas) or Gas E (LPG).
Domestic - Relating to household usage as opposed to commercial usage.
Domestic Water - Tap water (running water) is part of indoor plumbing.
Combustion - Process of burning; a process where two chemicals are combined to produce heat; a process wherein a fuel is
combined with oxygen, usually at high temperature, releasing heat.
Combustion Air - Air that is drawn into an appliance to mix with fuel and support combustion.
Flue - an enclosed passageway for conveying combustion gases.
Calibrate - make fine adjustments or divide into marked intervals for optimal measuring.
Appliance - a device to convert gas into energy; the term includes any component, control, wiring, piping or tubing required to
be part of the device.
Boiler - an appliance intended to supply hot liquid for space-heating, processing or power purposes.
Two Pipe System - This type of venting allows for exhaust flue and intake air piping to be separated from each other. Fresh
air may be drawn in at a different site from where the flue terminal is located.
240011317, Rev. F [03/31/2017]

4
INSTALLER Section
WARNING
Failure to comply with the above could result in severe personal injury, death or substantial property damage. Failure
to adhere to the guidelines on this page can result in severe personal injury, death or substantial property damage.
WARNING
If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage,
personal injury or death.
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 or your qualified service technician from a neighbor's phone. Follow the gas
supplier's or qualified personnel's instructions.
•If you cannot reach your gas supplier or your qualified service technician, call the fire department.
WARNING
Installation and service must be performed by a gas supplier or a qualified installer / service Technician. If
overheating occurs or the gas supply fails to shut off, do not turn off or disconnect the electrical supply to the pump.
Instead, shut off the gas supply at a location external to the appliance". Do not use this boiler if any part has been
under water. Immediately call a qualified service technician to inspect the boiler and to replace any part of the control
system and any gas control which bas been under water.
BEFORE INSTALLING AND WHEN SERVICING THE BOILER
•To avoid electric shock, disconnect electrical supply before performing maintenance.
•To avoid severe burns, allow boiler to cool before performing maintenance.
DURING BOILER OPERATION
• Do not block ow of combustion or intake air to boiler.
•If overheating occurs or gas supply fails to shut off, do not turn off or disconnect electrical supply to circulator. Instead, shut off
the gas supply at a location external to the appliance.
• Do not use this boiler if any part has been under water. Immediately call a qualied service technician to inspect the boiler and
to replace any part of the control system and any gas control that has been under water.
BOILER WATER
• If you have an old system with cast iron radiators, thoroughly flush the system (without boiler connected) to remove sediment.
The high-efficiency heat exchanger can be damaged by build-up or corrosion due to sediment.
•Do not use petroleum-based cleaning or sealing compounds in boiler system. Gaskets and seals in the system may be
damaged. This can result in substantial property damage.
• Do not use "homemade cures" or "boiler patent medicines." Serious personal injury, and/or substantial property damage,
damage to boiler may result.
•Continual fresh make-up water will reduce boiler life. Mineral build up in heat exchanger reduces heat transfer, overheats the
stainless steel heat exchanger, and causes failure. Addition of oxygen carried in by make-up water can cause internal corrosion
in system components. Leaks in boiler or piping must be repaired at once to prevent make-up water.
•We recommend the use of water treatment additives to prolong the life of the boiler and prevent against corrosion and
contaminant build ups in the heating system.
•Ensure piping in the heating system has an oxygen barrier.
FREEZE PROTECTION FLUIDS
NOTICE
Never use automotive or standard glycol antifreeze, or even ethylene glycol made for hydronic systems. Use only
inhibited propylene glycol solutions, which are specifically formulated for hydronic systems. Ethylene glycol is toxic
and can attack gaskets and seals used in hydronic systems. Ensure that the glycol used never exceeds 35% of the
systems volume as this may damage the systems components.
Consider piping and installation when determining boiler location. Any claims for damage or shortage in shipment
must be led immediately against the transportation company by the consignee.
240011317, Rev. F [03/31/2017]
WARNING

5
INSTALLER Section
HEATING APPLIANCE REMOVAL FROM A COMMON VENT SYSTEM
At the time of removal of an existing heating appliance, the following steps shall be followed with each appliance remaining
connected to the common vent system placed in operation, while the other appliances remaining connected to the common vent
system are not in operation.
•Seal any unused openings in the common vent system.
• Visually inspect the venting system for proper size and horizontal pitch to determine if there is blockage, leakage, corrosion or
other deficiencies that could cause an unsafe condition.
•If practical, close all building doors, windows and all doors between the space in which the appliance remains connected to
the common vent system and other spaces in the building. Turn on clothes dryers and any appliances not connected to the
common vent system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, at maximum speed. Do not
operate a summer exhaust fan. Close all fireplace dampers.
•Place in operation the appliance being inspected. Follow the lighting instructions. Adjust the thermostat so the appliance will
operate continuously.
•Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle.
•After it has been determined that each appliance remaining connected to common venting system properly vents when tested
as outlined, return doors, windows, exhaust fans, fireplace dampers and any other gas burning appliance to their previous
condition of use.
•Any improper operation of the common vent system must be corrected so the installation conforms to the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, and/or Natural Gas and Propane Installation Code, CAN/CSA B149.1.
When resizing any portion of the common vent system, the common vent system must be resized to approach the minimum
size as determined using the appropriate tables in Appendix G in the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
Verify proper operation after servicing.
CONDENSATE REMOVAL SYSTEM
This is a condensing high efciency appliance; therefore this unit has a condensate removal system. Condensate is nothing more
than water vapor, derived from the combustion products. It is very important that the condensate line is sloped away from the boiler
and down to a suitable inside drain. A condensate lter, if required by local authorities can be made up of lime crystals; marble or
phosphate chips that will neutralize the condensate. This can be done in the eld by the installer. It is also very important that the
condensate line is not exposed to freezing temperatures, or any other type of blockage. Plastic tubing must be the only material
used for the condensate line. Steel, brass, copper or others will be subject to corrosion or deterioration. Also, an increase in
pipe size may be necessary to drain properly. Support of the condensation line may be necessary to avoid blockage of the
condensate flow.
CG_2489
Raccordo per sifone per caldaie a condensazione Canada
Caldaie HT Canada
09-11-12 D'Andrea D.
CAUTION
The condensate line must remain unobstructed, allowing free flow of condensate. If condensate is allowed to freeze in
the line or if the line is obstructed in any other manner, condensate can exit from the boiler condensate trap, resulting
in potential water damage to property.
Note:
Use materials approved by the authority having jurisdiction. In the absence of other authority, PVC and CPVC pipe must comply with
ASTMD1785, F441 or D2665. Cement and primer must comply with ASTM D2564 or F493. For Canada, use CSA or ULC certied
PVC or CPVC pipe, ttings and cement. When installing a condensate pump, select one approved for use with condensing boilers
and furnaces. The pump should have an overow switch to prevent property damage from condensate spillage. Condensate from
the Boiler will be slightly acidic (typically with a pH from 3.0 to 4.0). Install a neutralizing lter if required by local codes.
240011317, Rev. F [03/31/2017]
Manufacturer requires an air vent be used to prevent condensate line vacuum lock.
Add Air Vent
CAUTION
NOTICE

6
1. INTRODUCTION
The Condensing boiler is a wall hung, fan assisted room-sealed combination boiler.
The boiler, providing both central heating and domestic hot water for the Utica Boiler MAC-150 model and only heating for the
Utica Boiler MAH - 125 model at street pressure, is designed for use with a fully pumped, sealed and pressurized heating
system. The boiler is supplied with a pump, diverter valve, pressure relief valve, and pressure gauge fully assembled and tested.
As supplied, the boiler will automatically modulate to provide central heating outputs between 19,108 and 112,601 Btu/h (5.6
and 33.0 kW).
The maximum output available for domestic hot water is 136,000 btu/h (40 kW), capable of providing 3.5 (U.S.) gpm (13.2 litres/
min) with a temperature rise of 70°F/39°C for the Utica Boiler MAC-150.
WARNING
It is the law that all gas appliances are installed by a competent person. It is in your own interest and that of safety to
ensure that the law is complied with.
•In the United States, 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. Where required by the authority having jurisdiction,
the installation must conform to the Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME
CSD-1. Safe lighting and other performance criteria were met with the gas manifold and control assembly provided on the
boiler when the boiler underwent tests specied in ANSI Z21.13-latest edition.
• In Canada, the installation must conform with CGA B149.1 INSTALLATION CODE and/or local installation Code, plumbing or
waste water codes and other codes as applicable.
•Clearances from and protection of combustible material.
•Manufacturer's instructions must NOT be taken in anyway as over-riding statutory obligations.
2. TECHNICAL DATA
2.1 PERFORMANCE
240011317, Rev. F [03/31/2017]
Maximum Minimum
Max Input,
MBH
Min Input,
MBH
Max output,
MBH
Min Output,
MBH
MAH-125 12522 113 98 95.0
MAC-150 12522 113 98 95.0 153 22 136 19
** Max DHW Flow rate 3.5GPM (13.2 l/min)
For elevations between 2000 ft (600M) and 4500 ft (1350m), use the following information:
Maximum Minimum
Max Input,
MBH
Min Input,
MBH
Max output,
MBH
Min Output,
MBH
MAH-125 113 22 101 95.0
MAC-150 113 22 101 95.0 13ϳ22 12Ϯ19
** Max DHW Flow rate 3.5GPM (13.2 l/min)
Model
Number (2)
AFUE%
Model
Number AFUE, %
Input, MBH(1) Heating
Ca pacit y, MBH *
(1)(3) Net AHRI
Rating Water, MBH
Domestic Hot Water (DHW) Circuit**
Input, MBH (KW)
Heating
Capacity,
MBH*
Domestic Hot Water (DHW) Circuit**
* Max CHSupply temp 176°F (80°C) for MAC-125 and MAH-150
* Max DHW temp 140° F (60° C)
* Max CHSupply temp 176°F (80°C) for MAH-125 and MAC-150
* Max DHW temp 140° F (60° C)
(1) 1000 Btu/hr (British Thermal Units Per Hour)
(2) Heating Capacity and AFUE (Annual Fuel Utilization Efficiency) are based on DOE (Department of Energy) test
procedures.
(3) Net AHRI Ratings based on piping and pickup allowance of 1.15. Contact Technical Support before selecting
boiler for installations having unusual piping and pickup requirements, such as intermittent system operation,
extensive piping systems, etc.
(1)(2)

7
INSTALLER Section (en)
2.2 PARAMETERS SETTING FOR HIGH ALTITUDE
MAH-125
Natural gas (A)
17.4 mbar
7.0 in w.c.
LP gas (E)
27.4 mbar
11.0 in w.c.
0 - 2000 Ft
0 - 610 m
2000 - 4500 Ft
610 – 1370 m
0 - 2000 Ft
0 - 610 m
2000 - 4500 Ft
610 – 1370 m
Parameter P71 *
Fan Speed (rpm)
115 60 65 40
5,650 5,100 5,150 4,900
Parameter P72 *
Fan Speed (rpm)
40 25
1,150 1,000
CO Limit (ppm) <400
MAC-150
Natural gas (A)
17.4 mbar
7.0 in w.c.
LP gas (E)
29.8 mbar
12.0 in w.c.
0 - 2000 Ft
0 - 610 m
2000 - 4500 Ft
610 – 1370 m
0 - 2000 Ft
0 - 610 m
2000 - 4500 Ft
610 – 1370 m
Parameter P71 *
Fan Speed (rpm)
220 170 170 150
6,700 6,200 6,200 6,000
Parameter P72 *
Fan Speed (rpm)
40 25
1,150 1,000
CO Limit (ppm) <400
*To modify the fan speed see section 14.
2.3 SYSTEM
MAH-125 / MAC-150
Central Heating (Sealed System)
Max System Pressure 43.00 psi / 2.96 bar
Min System Pressure 7.25 psi / 0.50 bar
Max System temperature 176°F / 80°C
Pressure Relief Valve Setting 30.00 psi / 2.11 bar
2.2 gal / 10.0 I
Expansion Tank Minimum Size
(pre-charge press.) at 11.6 psi / 0.8 bar
Flow Connection 3/4” /22.2 mm
Return Connection 3/4” /22.2 mm
Relief Valve Connection 3/4” /22.2 mm
Recommended System Pressure (cold) 21.7 psi / 1.5 bar
MAC-150
Domestic Hot Water
Max Inlet Water Pressure 116 psi / 8 bar
Min Inlet Water Pressure 2.9 psi / 0.2 bar
Min DHW Flow Rate 0.55 gpm / 2.50 I/min
Cold Water Inlet Connection 1/2” / 15.9 mm
DHW Outlet Connection 1/2” / 15.9 mm
Max DHW Temperature 140°F / 60°C
DHW Water Content 0.05 gal / 0.23 I
2.4 MAIN COMPONENTS
MAC-150 & MAH-125
Burner Stainless Steel
Main Heat exchanger Stainless Steel
DHW Heat exchanger Stainless Steel
Pump Grundfos UPR 15 - 58
Fan EBM PAPST NGR 118/0800
Gas Valve BERTELLI & PARTNERS SGV 100
Diverter Valve ELBI INTERNATIONAL
240011317, Rev. F [03/31/2017]

8
INSTALLER Section (en)
2.5 GENERAL INSTALLATION INFORMATION
Utica Boiler MAC-150 & MAH-125
Dimensions Height 30.04 in / 763.00 mm
Width 17.71 in / 450.00 mm
Depth 13.58 in / 345.00 mm
Gas Connection 3/4”
Primary Water Content 0.95 gal / 3.60 l
Air Vent Diameter 3.93 in / 100.00 mm
Flue Vent Diameter 2.36 in / 60.00 mm
Utica Boiler MAC-150 & MAH-125
Minimum Clearances for Servicing
Top8.66 in / 220.00 mm
Bottom 9.84 in / 250.00 mm
Sides 1.77 in / 45.00 mm
Front 17.71 in / 450.00 mm
Flue Terminal Size Concentric System 3.93 in / 100.00 mm
Flue Terminal Size 2-Pipe Flue System 3.14 in /80.00 mm
Flue Terminal Protruding 4.52 in / 115.00 mm
2.6 ELECTRICAL
Supply 120 V - 60 Hz
Power Consumption – MAH-125 133 W
Power Consumption - MAC-150 142 W
Internal Fuse F 3.15 A
Electrode Spark Gap 1/8” to 3/16” 13.5 to 4.5 mm
QWATER FLOW RATE MIN Minimum speed of modulation
HHEAD MAX Maximum speed of modulation
240011317, Rev. F [03/31/2017]
2.7 AVAILABLE PUMP HEAD FOR CENTRAL HEATING
This is a high static head pump fit for installation on any type of single or double-pipe heating systems. The automatic air
valve incorporated in the pump allows quick venting of the heating system.
NOTICE
The intended use of this pump is a boiler loop. Do not use as a primary system pump.
HR

9
INSTALLER Section
2.8 SYSTEM VOLUME
When the boiler is operating at maximum operating temperature, providing heating with all heat emitters operating, the
pressure gauge should not indicate more than 26.11 psi / 1.80 bar. If the reading exceeds this figure a larger expansion tank is
required.
2.9 BOILER SEQUENCE OF OPERATION
•With a demand for heating, the pump circulates water through the primary circuit.
•The combustion fan will then come on and begin to run at ignition speed.
• Once the fan reaches ignition speed the control board will allow power to flow to the spark generator and gas valve
creating ignition in the combustion chamber. The flame sensor will acknowledge the presence of a flame in the
combustion chamber and send a signal to the control board.
• The temperature sensor will send a signal to the control board allowing the control board to increase / decrease the speed
of the fan. The combustion fan will in turn modulate the gas rate accordingly.
•Once the central heating loop temperature exceeds the central heating loop setpoint the unit will shutdown and go through
a 3 minute time delay (burner pause time) before another call for heat.
•During this time the pump will run for an additional three minutes to dissipate any residual heat.
240011317, Rev. F [03/31/2017]

MAC - 150
Low Water Pressure Cutoff
10 240011317, Rev. F [03/31/2017]

MAH - 125
Low Water Pressure Cutoff
11 240011317, Rev. F [03/31/2017]

12
INSTALLER Section
2.10 BOILER INFORMATION MENU
Press and hold down for at least 1 second, to display the information indicated in the table. Press to exit.
DESCRIPTION DESCRIPTION
00 Secondary fault internal code 09 Setpoint Central Heating (°F/°C)
01 Heating ow temperature (°F/°C) 10/11 Manufacturing information
02 Outdoor temperature (°F/°C) 12 Flue sensor temperature (°F/°C)
03 Indirect Tank DHW temperature (boiler CH only) 13 Manufacturing information
04 Domestic hot water temperature
(boiler with plate exchanger) 14 Identication Open Therm communication
05 Water pressure in heating system (PSI/bar) 15 Manufacturing information
06 Heating return temperature (°F/°C) 16 Manufacturing information
07 Thermo fuse status (000/001) 17 Fan speed (“i17”x100)
08 Not used 18 Manufacturing information
BUTTONS Key
DHW temperature adjustment
(+to increase the temperature and – to decrease it)
Heating water temperature adjustment
(+to increase the temperature and – to decrease it)
Boiler operating information
Operating mode:
DHW – DHW & Heating – Heating Only
Off – Reset – Exit menu/functions
SYMBOLS Key
Off: heating and DHW disabled
(only boiler frost protection is active) Burner lit
Ignition fault DHW operating mode enabled
Boiler/system water pressure low Heating mode enabled
Call a qualied service technician Programming menu
Manually resettable fault ( ) Boiler information menu
Fault in progress Set unit of measurement (SI/US)








240011317, Rev. F [03/31/2017]

13
INSTALLER Section (en)
3. GENERAL BOILER INFORMATION
SERVICE CLEARANCES
1.77 in / 45.00 mm 1.77 in / 45.00 mm
8.66 in / 220.00 mm
450.00 mm
17.72 in /
345.00 mm
13.58 in /
30.04 in / 763.00 mm
Minimum
clearance of
17.71 in / 450
mm from front of
boiler
9.84 in / 250.00 mm
CLEARANCES REQUIRED FOR
CLOSET INSTALLATION CLEARANCES FOR
COMBUSTIBLES
1.77 in / 45.00 mm
1.77 in / 45.00 mm 450.00 mm
17.72 in /
1.77 in /
45.00 mm
1.77 in /
45.00 mm
1.57 in /
40.00 mm
CLOSED INSTALLATION
0 in /0 mm between the Back of the Unit and the wall
Note:
It is recommended that service clearances are considered when locating a suitable area for the unit.
TOP VIEW
BACK
WARNING
•The boiler must not be installed on carpeting.
•Keep boiler area clear and free from flammable vapors and liquid
240011317, Rev. F [03/31/2017]

14
INSTALLER Section
3.1 SELECTING THE BOILER LOCATION
1. Check for nearby connections to:
•System water piping
•Venting connections
•Gas supply piping
•Electrical power
2. Check the area around the boiler. Remove any combustible materials, gasoline and other ammable liquids.
3. Ensure the Boiler's gas control system components are protected from dripping or spraying water.
WARNING
Failure to keep boiler area clear and free of combustible materials, gasoline and other flammable liquids and vapors
can result in severe personal injury, death .
3.2 POSITIONING THE BOILER
• Decide the position of the boiler taking into account the clearances required for servicing and the ue terminal position.
WARNING
Remove any combustible materials, gasoline and other flammable liquids away from the hot water pipes
•Tape the template to the wall (ensure it is level and upright) and mark the position of the holes for the boiler mounting bracket
and plumbing connections. If rear exit ue is to be used, mark the position of the hole for the ue.
• If side exit ue is to be used, continue to mark the horizontal centre line of the ue across the wall to the side wall, then along
the side wall (ensure the lines are parallel and sloped properly towards the boiler, refer to section 4 "VENT SYSTEM"). This will
give the position of the centre of the hole for the ue.
• Cut the 4.33 in / 110.00 mm diameter hole in the wall for the concentric ue.
3.3 FIT THE BOILER
•Lift the boiler and hang it on the wall.
•Adjust the position of the boiler.
3.4 FLUSHING THE SYSTEM
• You must thoroughly ush the system (without boiler connected) to remove sediment. The high-efciency heat exchanger can
be damaged by build up or corrosion due to sediment.
Note:
It is recommended that a water treatment product be utilized for sediment removal.
• For zoned systems, ush each zone separately through a purge valve. (If purge valves and isolation valves are not already
installed, install them to properly clean the system.)
•Flush system until water runs clean and you are sure piping is free of sediment.
NOTICE
For installation that incorporates standing lron Radiation and systems with manual vents at the high points. Starting
with the nearest manual air vent, open vent until water flows out, then close vent. Repeat procedure, working your way
toward furthest air vent. It may be necessary to install a basket strainer in an older system where larger amounts of
sediment may be present. Annual cleaning of the strainer may be necessary.
3.5 GAS SUPPLY
MAH-125 requires a gas rate of 137.60 ft3/h (3.90 m3/h) for Gas A (Natural Gas) and 101.30 ft3/h (2.87 m3/h) for Gas E (Liquid
Propane Gas).
MAC-150 requires a gas rate of 167.20 ft3/h (4.74 m3/h) for Gas A (Natural Gas) and 122.80 ft3/h (3.48 m3/h) for Gas E (Liquid
Propane Gas).
The meter and supply pipes must be capable of delivering this quantity of gas in addition to the demand from any other appliances
in the house. The boiler requires at least a 3/4 in / 19.5 mm gas supply pipe.
WARNING
The boiler and its gas connections must be leak tested before placing the boiler in operation.
240011317, Rev. F [03/31/2017]

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INSTALLER Section (en)
3.6 ELECTRICAL SUPPLY
The boiler requires a 120V 60Hz power supply. Ensure the electrical supply is polarized.
The boiler must be grounded.
There must only be one common isolator, providing complete electrical isolation, for the boiler and any external controls.
Using PVC insulated cable 12 AWGx3C 221°F 105 ºC.
All wiring must be installed in accordance with requirements of National Electrical Code and any additional national, state, or local
code requirements having jurisdiction. All wiring must be N.E.C. Class 1. Boiler must be electrically grounded in accordance with
the National Electrical Code, ANSI/NFPA No. 70-latest edition.
In Canada, installation must conform to CSA C22.1 Canadian Electrical Code Part 1 and any local codes.
3.6.1 Install Room Thermostat
Install room thermostat on an inside wall. Never install where it will be inuenced by drafts, hot or cold water pipes, lighting xtures,
television, sun rays or near a replace.
3.7 AIR SUPPLY
The boiler does not require any air vents in the room in which it is installed, or when installed in a closet.
3.8 DOMESTIC HOT WATER MODE
For Utica Boiler MAC-150 and MAH-125 with indirect tank
WARNING
Water temperature over 125° F (51°C) can cause severe burns instantly, or death from scalds. Children, disabled, and
elderly are at highest risk of being scalded. See user's instructions before setting the water temperature.
•Priority is given to the domestic hot water supply. A demand at a tap or shower will override any central heating requirement.
• The flow of water will operate the DHW flow switch which requests the 3 way valve to change position. This will allow the pump
to circulate the primary water through the DHW plate heat exchanger. (MAC-150 only)
•The combustion fan will then come on and begin to run at ignition speed.
• Once the fan reaches ignition speed the control board will allow power to flow to the spark generator and gas valve creating
ignition in the combustion chamber. The flame sensor will acknowledge the presence of the flame in the combustion chamber
and send a signal to the control board.
• The temperature sensors will send a signal to the control board allowing the control board to increase/ decrease the speed of
the fan. The combustion fan will in turn modulate the gas rate accordingly.
•When the domestic hot water demand ceases the burner will extinguish, unless there is a demand for central heating.
3.9 FROST PROTECTION MODE
The frost protection mode is integrated into the appliance when left in the domestic hot water or central heating position. If the
temperature falls below 41°F / 5° C the boiler will re on its minimum setting until a ow temperature of 86°F / 30° C is reached.
3.10 PUMP PROTECTION
The pump will automatically operate for 1 minute in every 24 hours to prevent seizing.
3.11 GAS PIPING
Run the gas supply line in accordance with all applicable codes.
Locate and install the manual shutoff valve before the gas valve as shown in section 3: "GENERAL BOILER INFORMATION", in
accordance with state and local requirements.
NOTICE
A sediment trap must be provided upstream of the gas controls.
240011317, Rev. F [03/31/2017]

16
INSTALLER Section (en)
4. VENT SYSTEM
GENERAL
• Install the boiler / venting system in accordance with these instructions and with the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, CAN/CSA B149.1, and/or applicable provisions of local building codes.
• This boiler is a direct vent appliance according to ANSI Z21.13/CSA4.9 standard.
EXHAUST VENT AND INTAKE AIR VENT
This boiler is a direct vent appliance according to ANSI Z21.13/CSA4.9 standard. The intake and exhaust venting methods are
detailed in the section 4: "VENT SYSTEM". Do not attempt to install the Boiler using any other means. Be sure to locate the boiler
such that the air intake and exhaust vent piping can be routed through the building and properly terminated.
DANGER
Ensure the exhaust and intake vent piping comply with these instructions regarding the vent system. Inspect finished
combustion air intake and exhaust piping thoroughly to ensure all joints are well secured and airtight and comply with
all applicable code requirements, as well as with the instructions provided in this manual. Failure to provide a properly
installed vent system will cause severe personal injury or death.
WARNING
This vent system will operate with a positive pressure in the pipe. Do not connect vent connectors serving appliances
vented by natural draft into any portion of mechanical draft systems operating under positive pressure. Follow
the venting instructions below carefully. Failure to do so may result in severe personal injury, death.
•Do not use Foam Core Pipe or Cellular Foam Core Pipe in any portion of the venting from this boiler. Use of Foam
Core Pipe or Cellular Foam Core Pipe may result in severe personal injury, death.
•Determine exhaust vent location:
a) See illustration within this section of clearances for the location of the exit terminals of direct-vent venting systems.
b) Provide a minimum of 12"(305mm) in the united states and 36"(0.9m) in Canada distance from any door, operable window, or
gravity intake into any building.
c) Provide a minimum of 1.00 ft / 0.30 m clearance from the bottom of the exhaust above the grade (snow removal may be
necessary to maintain clearance).
d) In the United States provide a 3 ft/ 0.92 m horizontal clearance and in Canada a 3.00 ft / 0.92 m clearance from electrical
meters, gas meters, gas regulators and relief equipment. In no case shall the exit terminal be above or below the aforementioned
equipment within a height of 15 ft (4.5 m) unless the 3 ft (0.92 m) horizontal distance is maintained.
e) Do not locate the exhaust over public walkways where condensate could drip and/or freeze and create a nuisance or hazard.
f) When adjacent to a public walkway, locate exit terminal at least 7.00 ft / 2.13 m above grade.
g) Do not locate the exhaust directly under roof overhangs to prevent icicles from forming.
h) Provide a 36 in / 456 mm clearance from the inside corner of vertical walls, chimneys, etc., as well as horizontal corners
created by roof overhangs.
•Determine air intake vent location.
a) Provide 1.00 ft / 0.30 m clearance from the bottom of the intake air vent and the grade.
b) Do not locate intake air vent in a parking area where machinery may damage the pipe.
c) When venting with a two-pipe system. Minimum distance between exhaust vent and intake air vent on a single boiler is 4.72 in
/ 120.00 mm center-to-center.
INSTALLING EXHAUST VENT AND INTAKE AIR VENT
DANGER
Ensure that the flow of combustion and ventilation air are not obstructed.
Manufacturer urges users to install CO detectors in buildings where the boiler is located, even though such detectors
may not be required by local law. CO detectors should be calibrated regularly as specified by the manufacturer.
Note:
To x ue pipes to the wall, supports should be approximately 3.28 feet (1 meter) from each other. Supports should be xed along
the joint point of each pipe.
240011317, Rev. F [03/31/2017]

17
INSTALLER Section (en)
240011317, Rev. F [03/31/2017]
4.1 Approved Venting Materials
WARNING
We recommend that the Condensing boiler be vented with approved polypropylene venting material. This can be with
either coaxial venting or with the two pipe rigid vent system. Use only materials listed below for vent pipe, intake air
pipe and fittings. Failure to comply could result in personal injury, death or property damage . Installations must comply
with local code requirements and with U.S.ANSI Z223.1
All venting must be properly supported. The boilers are not intended to support any type of vent system whatsoever.
All piping, glue, solvents, cleaners, fittings and components must conform to ASTM and ANSI standards.
Note: In Canada ULC S636 and in the USA UL 1738 schedule 40 CPVC are the only approved vent system to be used as
an alternative to polypropylene venting for the exhaust pipe.
Vent Material Options:
or
or
1. 100mm / 60mm Polypropylene concentric ("4 inch / 2 inch")
2. 80 mm polypropylene twin pipe (MUST be polyproylene on BOTH intake and exhaust) ("3inch")
3. 3" Twin pipe CPVC (PVC optional on intake ONLY).
•
Approved Polypropylene Manufacturers
•
Natalini
•
Duravent
Centrotherm
Note: Maximum equivalent length may vary between manufacturers. See details in following sections.

18
INSTALLER Section (en)
4.2 VENTING INSTRUCTIONS
4.2.1 Concentric venting
•Examine all components for possible shipping damage, prior to installation.
•This venting system must be free to expand and contract.
•The venting system must be supported in accordance with these instructions.
•The vent system must have unrestricted movement through walls, ceilings and roof penetrations.
• Check for proper joint construction when joining pipe to ttings.
• If venting is penetrating ceilings and oors, the openings must have restopping provided in joist areas and the installation of
restop spacer assemblies.
• Roof ashing parts are shown in the manual. Standard roof ashing methods must be employed to install the roof ashing.
•Wall and roof openings must be framed to provide support and the attachment of termination assemblies.
Please Note:
The manual uses the terms 'vent' , 'venting' and 'ue' interchangeably. A ll r eferences t o ' ue' ar e sy nonymous with 'v ent' or
'venting'.
Check all measurements before cutting. Clearance to combustible materials when using a concentric vent system is
zero.
2°
x
Y
CG_1630
NOTICE
All concentric venting must be fastened together using screws.
Note: Dual ue venting is not to be fastened with screws. This procedure only pertains to concentric venting.
240011317, Rev. F [03/31/2017]
NOTICE

19
INSTALLER Section (en)
Concentric Vent Support
All venting must be supported every 3.28 ft (1.00 m) using steel strapping or equivalent.
A: steel strapping or equivalent
A
CG_2274
Note:
Ensure that the vent is sloped towards the boiler approximately 0.79 in for every 3.28 ft (2.00 cm for every 1.00 m).
For horizontal ues a minor deviation from the horizontal is allowable, provided it results in a downward slope towards the boiler.
For the vertical ue terminal assembly refer to the separate installation instructions supplied with the assembly.
Additional ue components are available as follows:
45° bend 1.64 ft / 0.50 m
90° bend 3.28 ft / 1.00 m
Under no circumstances must the ue length (including allowances for extra bends) exceed 32.80 ft / 10.00 metres.
•Install a flue elbow on the adapter at the top of the boiler. Set the elbow to the required orientation (rear, right or left).
•Measure the distance from the outside wall face to the elbow. This dimension will be known as 'X'.
•To dimension 'X' add "Y" + 2 in (50 mm). This is the total dimension of the vents.
•Taking the air vent, mark the above dimension Measure the length of waste material, and transfer the dimension to the flue.
• Remove the waste from both vents (flue and air vents). Ensure that the cut ends are square and free from burrs.
• Insert the flue into the intake air vent and pass them through the hole in the wall
•Check all measurements before cutting. Minimum clearance to combustible materials when using a concentric
vent system is zero.
•After installing vents make sure that there is no recirculation of combustion by using a regularly calibrated analyzer.
•Ensure a minimum downward slope of 0.79 in / 2.00 mm for every 3.28 ft / 1.00 m of the flue length toward the boiler
at least 2º.
•Ensure that the terminal is positioned with the slots to the bottom.
Flue Options
• The boiler can be tted with ue systems as illustrated.
• The standard ue (horizontal termination) is suitable only for horizontal applications.
• Maximum permissible equivalent ue lengths are:
Concentric and vertical ue = 32.80 ft / 10.00 m
• Any additional "in line" bends in the ue system must be taken into consideration.
45° bend 1.64 ft / 0.50 m
90° bend 3.28 ft / 1.00 m
•The illustrations below show examples of maximum equivalent lengths.
• Instructions for guidance and ttings are included in each kit.
240011317, Rev. F [03/31/2017]
NOTICE
Equivalent Straight Length

20
INSTALLER Section (en)
Concentric Vent Screw Placement
Two screws must be fastened through the outer intake pipe behind the gaskets at equal distances approx. 180º apart. Please note
the screws used must be no larger than No.8 - 1/2 sheet metal screws and must be zinc coated. The length of this screws must
be 0.75 in (19.00 mm).
WARNING
Before securing the screws ensure the pipe has been pushed in a minimum of 1 3/4" (45 mm) into the gasketed end of
the other pipe.
IMPORTANT INFORMATION
To insert the pipes use only silicone grease supplied with the exhaust pipes. The silicone grease has to be used only
in the smaller seal of the exhaust pipes. Do not use other types of grease. Do not apply to large seal.
240011317, Rev. F [03/31/2017]
L MAX - Ø 60/100 mm
Natalini Duravent Centrotherm
A B 32.80 ft / 10.00 m 27.88 ft / 8.50 m 24.60 ft / 7.50 m
C D 29.52 ft / 9.00 m 24.60 ft / 7.50 m 21.32 ft / 6.50 m
E F 32.80 ft / 10.00 m 27.88 ft / 8.50 m 24.60 ft / 7.50 m
G26.24 ft / 8.00 m 21.32 ft / 6.50 m 18.04 ft / 5.50 m
H29.52 ft / 9.00 m 24.60 ft / 7.50 m 21.32 ft / 6.50 mH29.52 ft / 9.00 m 24.60 ft / 7.50 m 21.32 ft / 6.50 m