UTICA BOILERS MAHF-100 User manual

Manufactured by:
ECR International Inc.
2201 Dwyer Avenue, Utica, NY 13501
Tel. [phone]
www.ecrinternational.com
MAHF-100
MACF-115
MAHF-125
MACF-150
MAHF-165
MACF-205
CONDENSING
GAS FIRED BOILER

MACF-150

CONTENTS :
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
(240013371)
APPLICATION GUIDE
(240012875)
COMMISSIONING
GUIDE
(240011376)
REQUIRED
INSPECTION SPECIAL
(240011561)
BACK COVER

MAHF-125

CONDENSING GAS FIRED
INSTALLATION, OPERATION
& MAINTENANCE MANUAL
Models:
COMBI
MACF-115
MACF-150
MACF-205
HEATING ONLY
MAHF-100
MAHF-125
MAHF-165
Manufactured by:
ECR International Inc.
2201 Dwyer Avenue, Utica, NY 13501
Tel. [phone]
www.ecrinternational.com
PN 240013371 REV. B [10/01/2021]

2
Fully Assembled Boiler 30 PSI Safety Relief
Valve
Temperature Pressure
Gauge (2" Shank)
3/4 NPT Ball Gas
Shuto Valve
Includes Essential
Documents and Warranty
11x17 Wire Diagrams
DHW Optional Pipe
Heat Only Boiler
Copper Flush Bushing
1/2” x 1/4” NPT
Copper Tee
1-1/4” x 1-1/4 “x 1/2” Document Package
VERIFY CONTENTS RECEIVED
Threaded End
Non-Threaded
End
Copper Tee
NOTICE
Using proper brazing or soldering technique,

with threading up and non-threaded end down.
If the threaded end is not UP the TP gauge
cannot engage the threads in the bushing.
* Verify proper model size before use.
240013371 REV B, [10/01/2021]
For Parts lists see manual 240013373 included with your boiler literature package.

3
Verify contents received................................................2
Table of contents...........................................................3
Physical Data.................................................................4
1 - Important Information.............................................7
2 - Introduction.............................................................8
2.3 Requirements for Commonwealth of Massachusetts 8
2.4 Use of Carbon Monoxide Monitor.............................. 8
2.5 Designated Use ..................................................... 8
2.6 The unit MUST NOT: .............................................. 8
2.7 Operational Features.............................................. 8
3 - Component Listing ...................................................9
4 - Locating Boiler .......................................................15
4.1 Boiler Location Considerations ..............................15
4.2 Floor Location .....................................................15
4.3 Clearances..........................................................16
5 - Combustion Air And Vent Piping.............................17
5.1 General ...............................................................17
5.2 Removal of Existing Boiler From Common Vent System18
 ...........................................................18
5.4 Approved Venting Materials ...................................19
5.5 Vent Termination..................................................19
5.6 Coaxial Venting Instructions...................................21
5.7 Coaxial Vent Screw Placement - See Figure 5-3 .... 22
5.8 Twin Pipe Systems................................................23
5.9 Securing Twin Pipe Polypropylene Venting............ 24
5.10 (3" /80 mm Only) Flexible Vent System .......... 27
5.11 Condensate Piping ..............................................29
6 - Hydronic Piping......................................................30
6.1 General ...............................................................30
6.2 Special Conditions ................................................30
6.3 Safety Relief Valve and Air Vent..............................31
6.4 Trim Piping ..........................................................31
6.5 System Piping ......................................................31
 ......................33
6.7 Manufacturer Recommendation - Strainer ................34
6.8 Central Heating System.........................................35
6.9 Domestic Hot Water Mode......................................35
6.10 Frost Protection Mode ..........................................35
6.11 Pump Protection .................................................35
7 - Gas Supply Piping ..................................................36
7.1 General ...............................................................36
7.2 Gas Pipe Recommendations ...................................37
7.3 Leak Check Gas Piping ..........................................39
 ...................................39
8 - Electrical Connections ............................................40
8.1 General ...............................................................40
8.2 Install Room Thermostat .......................................40
8.3 Electrical Connections............................................40
8.4 Access To Connection Block ...................................41
8.5 Main Supply Connection.........................................41
8.6 Install Room End Switch ........................................42
8.7 Optional Electrical Connections ...............................42
8.8 Indirect Storage Tank............................................44
8.9 Management of 0-10V Input...................................44
9 - Start Up Procedure.................................................46
9.1 Central Heating System Connections - HEAT ONLY ...46
9.2 Central Heating System Connections - Combi ...........46
9.3 System Start Up...................................................47
9.4 Fill Condensate Trap with Water .............................47
9.5 Control Panel .......................................................48
9.6 Prior to Commissioning: ........................................49
9.7 Commissioning For The First Time: .........................49
9.8 Automatic Calibration Function ...............................49
9.9 Manual Calibration Function: ..................................50
9.10 De-Aeration Function...........................................50
9.11 Commission Set Up (Gas) - Changing The Type Of Gas
...............................................................................50
9.12 Chimney Sweep Function ....................................51
9.13 Combustion Adjustment Function (CO2%).......... 51
9.14 Check Firing Rate................................................51
9.15 Parameter Settings .............................................52
9.16 Description Of Parameters: Factory Settings ....... 52
9.17 Adjusting Maximum Heating Power........................54
10 - Operating instructions .........................................55
10.1 Testing For Gas Leaks And Purging The Gas Supply
...............................................................................55
10.2 Boiler Operation..................................................55
10.3 Central Heating Mode ..........................................55
10.4 Domestic Hot Water Mode....................................55
10.5 Frost Protection ..................................................56
10.6 Pump ................................................................56
10.7 Low Water Pressure Sensor (Internal)............... 56
11 - General Maintenance and Cleaning.......................57
11.1 Beginning of Each Heating Season.........................57
11.2 Maintenance And Routine Servicing .......................58
11.3 Component Replacement And Cleaning .............. 58
11.4 Draining the Boiler ..............................................59
11.5 Draining the Heating Circuit .................................59
11.6 Hydraulic Unit (DHW) ..........................................60
11.7 Cleaning The Cold Water Filter..............................60
11.8 Final Commissioning............................................60
11.9 Final Assembly ...................................................60
11.10 User Information...............................................61
11.11 Safety Flue Thermostat ........................................61
11.12 Flue Pressure Switch ............................................61
11.13 Replacement Parts ............................................61
12 - Ratings And Capacities.........................................62
12.1 Ratings and Capacity...........................................62
 ........................62
12.3 High Altitude Ratings...........................................63
12.4 High Altitude Chart..............................................63
12.5 Available Pump Head For Central Heating...............64
13 - Trouble Shooting..................................................65
13.1 Error Messages And Resetting The Boiler................65
13.2 Anomalies Table for the Installer - Use this table to
report the anomaly values...........................................67
14 - Glossary ...............................................................68
Appendix A - Wiring Diagrams.....................................70
TABLE OF CONTENTS
240013371 REV B, [10/01/2021]

4
DIMENSIONS
SYSTEM
When boiler is operating at maximum operating temperature, providing heating with all heat emitters operating, pressure

PHYSICAL DATA
DIMENSIONS 100 / 125 115 / 150 165 / 205
AHeight (Bottom of boiler top of safety Valve)
43.65" [1.09 m]
BOverall Width with Manifold
24.70" [628 mm]
CDepth
17.46” [444 mm] 23.55” [598 mm]
DCondensate Trap Connection
3/4" [19.1 mm] NPT
ESystem Supply

Sweat Connection

Sweat Connection
FDHW Outlet (125 Optional) 3/4” [19.1 mm]
Copper Sweat
1/2” [15.9 mm]
Copper Sweat
165-NA
205 - 3/4” [19.1 mm]
GGas Connection
3/4” NPT [19.1 mm]
HDHW (Cold Water) Inlet N/A 1/2” [15.9 mm]
Copper Sweat
165 - N/A
205 - 3/4” [19.1 mm]
IBoiler Return
3/4” [19.1 mm] 1” [38.1 mm]
Boiler Filling Connection External to Boiler
Primary Water Content 0.95 gal [3.60 L] 1 gal [3.79 L] 
Central Heating (Sealed System) 100 / 115 / 125 / 150 / 165 / 205
Heat Exchanger Max Allowable Working Pressure 50 psi [3.45 bar]
Max System Pressure 43 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 psi [2.11 bar]
Expansion Tank Minimum Size (pre-charge press.)
(100/115)
1.5 gal at 11.6 psi
[7.0 L at 0.8 bar]
(125/150/165/205)
2.2 gal at 11.6 psi [10.0 L at 0.8 bar]
Recommended System Pressure (cold) 21.7 psi [1.5 bar]
Domestic Hot Water 115 150 205
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 L/min]
Max DHW Temperature 140°F [60°C]
DHW Flat Plate Water Content 0.035 gal [0.13 L] 0.053 gal [0.23 L] 0.10 gal [0.37 L]
240013371 REV B, [10/01/2021]

MODELS - 100/115/125/150
Top View
Front View Right Side View
Left Side View
1.62
1.62
1.62
1.62
10.44 in.10.44 in.
[266 mm][266 mm]
6.87 in.6.87 in.
[175 mm][175 mm]
18.56 in. [472 mm]18.56 in. [472 mm]
20.50 in. [521 mm]20.50 in. [521 mm]
24.70 in. [628 mm]24.70 in. [628 mm]
2.22 in.2.22 in.
[56.4 mm][56.4 mm]
9.13 in.9.13 in.
[232 mm][232 mm] 7.92 in.7.92 in.
[201 mm][201 mm]
6.63 in.6.63 in.
[168 mm][168 mm]
4.35 in.4.35 in.
[111 mm][111 mm]
6.12 in.6.12 in.
[156 mm][156 mm]
7.31 in.7.31 in.
[186 mm][186 mm]
1.80 in.1.80 in.
[46 mm][46 mm]
43.65 in.43.65 in.
[1.1 m][1.1 m]
40.23 in.40.23 in.
[1.0 m][1.0 m]
37.20 in.37.20 in.
[.95 m][.95 m]
2.99 in.2.99 in.
[76 mm][76 mm]
3.15 in.3.15 in.
[80 mm][80 mm]
10 in.10 in.
[255 mm][255 mm]
6.56 in.6.56 in.
[167 mm][167 mm]
4.35 in.4.35 in.
[110 mm][110 mm]
6.63 in.6.63 in.
[168 mm][168 mm]
9.13 in.9.13 in.
[232 mm][232 mm]
6.47 in.6.47 in.
[165 mm][165 mm]
42.03 in.42.03 in.
[1.0 m][1.0 m]
17.46 in.17.46 in.
[443 mm][443 mm]
2.90 in.2.90 in.
[74 mm][74 mm]
1.62 in.62 in.
[42 mm]
5
Domestic Hot Water 115 150 205
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 L/min]
Max DHW Temperature 140°F [60°C]
DHW Flat Plate Water Content 0.035 gal [0.13 L] 0.053 gal [0.23 L] 0.10 gal [0.37 L]
PHYSICAL DATA
240013371 REV B, [10/01/2021]

Front View
165 & 205
Models
MODELS - 165 & 205
Right Side
View
165 & 205
Left Side View
165 & 205
Models
5.35 in.5.35 in.
[136 mm][136 mm] 13.33 in.13.33 in.
[339 mm][339 mm]
5.35 in.5.35 in.
[136 mm][136 mm]
8.388.38
[213 mm][213 mm]
42.69 in.42.69 in.
[1.08 m][1.08 m]
40.23 in.40.23 in.
[1.0 m][1.0 m]
37.20 in.37.20 in.
[.95 m][.95 m]
4.17 in.4.17 in.
[106 mm][106 mm]
2.46 in.2.46 in.
[62 mm][62 mm]
2.90 in.2.90 in.
[74 mm][74 mm]
3.32 in.3.32 in.
[84 mm][84 mm]
9.39 in.9.39 in.
[239 mm][239 mm]
6.26 in.6.26 in.
[159 mm][159 mm]
3.07 in.3.07 in.
[78 mm][78 mm]
41.87 in.41.87 in.
[1.06 m][1.06 m]
7.39 in.7.39 in.
[187 mm][187 mm]
6.26 in.6.26 in.
[159 mm][159 mm]
10 in.10 in.
[255 mm][255 mm]
23.55 in.23.55 in.
[598 mm][598 mm]
9.079.07
[230 mm][230 mm]
1.67 in.1.67 in.
[43 mm][43 mm]
8.46 in.8.46 in.
[215 mm][215 mm]
12.02 in.12.02 in.
[205 mm][205 mm]
Top View
165 & 205
18.56 in. [472 mm]18.56 in. [472 mm]
20.43 in. [519 mm]20.43 in. [519 mm]
24.75 in. [624 mm]24.75 in. [624 mm]
25.80 in. [655 mm]25.80 in. [655 mm]
7.18 in.7.18 in.
[182 mm][182 mm]
16.71 in.16.71 in.
[424 mm][424 mm]
6
PHYSICAL DATA
240013371 REV B, [10/01/2021]

7
1 - IMPORTANT INFORMATION
CAUTION
Indicates a hazardous situation which, if not
avoided, could result in minor or moderate injury.
!!
WARNING
Indicates a hazardous situation which, if not
avoided, could result in death or serious injury.
!
DANGER
Indicates a hazardous situation which, if not
avoided, WILL result in death or serious injury.
!
This is the safety alert symbol. Symbol alerts you to
potential personal injury hazards. Obey all safety messages
following this symbol to avoid possible injury or death.
Become familiar with symbols identifying potential hazards.

agency. See glossary for additional information.
1. Safety Information
WARNING
Do not tamper with or use this boiler for any
purpose other than its intended use. Failure
to follow these instructions could result in
death or serious injury. Use only manufacturer
recommended parts and accessories.
!
CAUTION
Laceration, burn hazard. Metal edges and parts
may have sharp edges and/or may be hot. Use
appropriate personal protection equipment to
include safety glasses and gloves when installing
or servicing this boiler. Failure to follow these
instructions could result in minor or moderate
injury.
!!
NOTICE
Used to address practices not related to personal
injury.
WARNING
Fire, explosion, asphyxiation and electrical shock
hazard. Improper installation could result in
death or serious injury. Read this manual and
understand all requirements before beginning
installation.
!
FOR YOUR SAFETY READ BEFORE OPERATING
Hot Water Can Scald!
Water heated to temperature for clothes washing,
dish washing and other sanitizing needs can scald
and cause permanent injury.

handicapped persons are more likely to be
permanently injured by hot water. Never leave
them unattended in bathtub or shower. Never allow
small children to use a hot water tap or draw their
own bath.

above description, or if state laws or local codes
require certain water temperatures at hot water
taps, you must take special precautions:
• Use lowest possible temperature setting.
• Install some type of tempering device, such
as an automatic mixing valve, at hot water tap
or water heater. Automatic mixing valve must be
selected and installed according to manufacturer's
recommendations and instructions.
• Water passing out of drain valves may be
extremely hot. To avoid injury:
• Make sure all connections are tight.
• 
DANGER
!
Water
Temperature
Seng
1st Degree Burn
Exposure Time For
An Adult
2nd and 3rd Degree Burn
Exposure Time For An
Adult
120° F 1 minute 5 minutes
130° F 5 seconds 30 seconds
140° F 2 seconds 5 seconds
150° F 1 second 1.5 seconds
160° F Instantaneous 0.5 seconds
Note: Warning for Infants, Children, and Elderly:
Great care must be taken when exposing the
aforementioned groups to warm or hot water as they
can be badly burned in exposure times less than half
of the time for an adult.
WARNING
Fire, Explosion, Asphyxiation, Electrical shock
hazard! Flooding will result in damages such as
electrical problems, corrosion, inoperative parts,
mold and other unforeseen issues which can
occur over time. Any equipment determined by

excess of water or other liquid, shall be replaced.
Failure to follow these directions will result in a
Hazardous Situation.
!
240013371 REV B, [10/01/2021]

8
2 - INTRODUCTION
Check our website frequently for updates: www.ecrinternational.com
Information and specications outlined in this manual in eect at the
time of printing of this manual. ECR International reserves the right to
discontinue, change specications or system design at any time without
notice and without incurring any obligation, whatsoever.
2.5 Designated Use
• MACF-115, MACF-150 and MACF-205 provide
both central heating and domestic hot water.
• MAHF-100, MAHF-125 and MAHF-165 central
heating only.
• Indoor installation.
• Closet or alcove installation. Direct Vent Boiler
does not require air vents when installed in closet
or room.
• Direct vent boiler.
• 
gases (LP/propane).
2 - INTRODUCTION
2.1 Installation shall conform to requirements of
authority having jurisdiction or in absence of such
requirements:
UNITED STATES
• National Fuel Gas Code, ANSI Z223.1/NFPA 54.
• National Electrical Code, NFPA 70.
2. 2 Where required by authority having jurisdiction,
installation shall conform to Standard for Controls and
Safety Devices for Automatically Fired Boilers, ANSI/
ASME CSD-1.

required.
2.3 Requirements for Commonwealth of
Massachusetts:
Boiler installation must conform to Commonwealth of
Massachusetts code 248 CMR which includes but is not
limited to:

2.6 The unit MUST NOT:
• Directly heat potable water. Indirect heating is
acceptable.
• Heat water with non-hydronic heating system
chemicals present (example, swimming pool
water).
• Toxic chemicals, such as those used for boiler
treatment, shall not be introduced into potable
water used for space heating.
• Exceed 43 psig (2.96 bar) maximum system
pressure, or drop below minimum system
pressure 7.25 psig (.50 bar)
• Exceed 176°F (80°C) system design temperature.
2.7 Operational Features
• MAHF-100 Modulates input to provide CH
Turndown 5.6:1
• MACF-115 Modulates input to provide CH
Turndown 5.6:1, DHW Turndown 6.9:1
• MAHF-125 Modulates input to provide CH
Turndown 5.7:1
• MACF-150 Modulates input to provide CH
Turndown 5.7:1, DHW Turndown 7:1
• MAHF-165 Modulates input to provide CH
Turndown 5.5:1
• MACF-205 Modulates input to provide CH
Turndown 5.5:1, DHW turndown 7:1
• Maximum output available for domestic hot
water:
MACF-115 - 105,500 btu/hr (33.8 kW) capable of
providing 2.5 (U.S.) gpm (11.4 liters/min) with a
temperature rise of 70°F/39°C.
MACF-150 - 136,000 btu/h (40 kW), capable of
providing 3.5 (U.S.) gpm (13.2 liters/min) with a
temperature rise of 70°F/39°C.
MACF-205 - 180,000 btu/h (53 kW), capable of
providing 5.0 (U.S.) gpm (18.9 liters/min) with
temperature rise of 70°F/39°C.
• 
• Optional Outdoor Temperature Reset.
• Heat exchanger over heat protection.
• Boiler operating at maximum operating
temperature, providing heat, pressure gauge
should not indicate more than 26.11 psi /

expansion tank is required.
2.4 Manufacturer recommends use of Carbon
Monoxide monitor may be requirement of local
jurisdiction.
240013371 REV B, [10/01/2021]

9
3 - COMPONENT LISTING
ITEM
NO.
Utica Boiler
MAHF-100
1Coaxial Connector
2Flue Sensor
3Heat Exchanger
4Burner (not shown)
5Flame Detection Electrode
6Air/Gas Blend Manifold
7Fan
8Venturi
9Pump with Air Separator
10 Boiler Drain Tap
11 Heating Return
12 Gas Inlet
13 Optional Indirect Tank
Connection
14 Heating Supply Connection
15 Condensate Connection
16 
17 3-Way Valve with Motor
18 Gas Valve
19 Over Temperature Thermostat
20 NTC Heating Sensor
21 Ignition Electrode
22 Pressure Relief Valve
23 Exhaust Test Port
24 Intake Test Port
9
2
4
1
3
6
5
7
8
10
13
23
24
20
19
21
1112
14
15
16
17
18
22
240013371 REV B, [10/01/2021]
UTICA BOILER MAHF-100

10
3 - COMPONENT LISTING
Illustrations are a depiction of the boiler for general location of parts and may vary depending on model.
ITEM
NO.
Utica Boiler
MAHF-125
1Coaxial Connector
2Flue Sensor
3Heat Exchanger
4Burner (not shown)
5Flame Detection Electrode
6Air/Gas Blend Manifold
7Venturi
8Fan
9Pump with Air Separator
10 Boiler Drain Tap
11 Heating Return
12 Gas Inlet
13 Optional Indirect Tank
Connection
14 Heating Supply Connection
15 Condensate Connection
16 
17 3-Way Valve with Motor
18 Gas Valve
19 Water Safety Thermostat
20
NTC Heating sensor (Flow/Return)
QTY 2, (1 Shown for clarity)
21 Ignition Electrode
22 Pressure Switch
23 Pressure Relief Valve
24 Exhaust Test Port
25 Intake Test Port
9
2
4
1
3
6
5
7
8
10
13
22
24
25
20
19
21
111214
15
16
17
18
23
240013371 REV B, [10/01/2021]
UTICA BOILER MAHF-125

11
ITEM
NO.
Utica Boiler
MAHF-165
1Coaxial Connector
2Flue Sensor
3Heat Exchanger
4Burner (not shown)
5Flame Detection Electrode
6Air/Gas Blend Manifold
7Fan
8Venturi
9Pump with Air Separator
10 Boiler Drain Tap
11 Heating Return
12 Heating Supply Connection
13 Gas Inlet
14 Condensate Connection
15 
16 Inlet Element
17 Gas Valve
19 Over Temperature Thermostat
20 NTC Heating Sensor
21 Ignition Electrode
22 Pressure Relief Valve
23 Exhaust Test Port
24 Intake Test Port
3 - COMPONENT LISTING
Illustrations are a depiction of the boiler for general location of parts and may vary depending on model.
9
2
4
1
3
6
5
7
8
10
12
20
19
21
1113
14
16
17
22
23
24
240013371 REV B, [10/01/2021]
UTICA BOILER MAHF-165

12
ITEM
NO.
Utica Boiler
MACF-115
1Coaxial Connector
2Flue Sensor
3Heat Exchanger
4Burner (not shown)
5Flame Detection Electrode
6Air/Gas Blend Manifold
7Venturi
8Fan
9Pump with Air Separator
10 DHW Priority Sensor
11 Flow Sensor with Water Filter
and Flow Restrictor
12 Boiler Drain Tap
13 Heating Return
14 Cold Water DHW Inlet
15 Gas Inlet
16 DHW Outlet
17 Heating Supply
18 Condensate Connection
19 DHW Heat Exchanger
20 NTC DHW Sensor
21 
22 3-Way Valve with Motor
23 Gas Valve
24 Water Safety Thermostat
25
NTC Heating sensor (Flow/Return)
QTY 2, (1 Shown for clarity)
26 Ignition Electrode
27 Pressure Relief Valve
28 Exhaust Test Port
29 Intake Test Port
9
16
2
25
24
19
4
1
26
3
6
5
7
8
27
10
11
12
14 131517
18
20
21
22
23
28
29
3 - COMPONENT LISTING
Illustrations are a depiction of the boiler for general location of parts and may vary depending on model.
240013371 REV B, [10/01/2021]
UTICA BOILER MACF-115

13
3 - COMPONENT LISTING
Illustrations are a depiction of the boiler for general location of parts and may vary depending on model.
9
16
27
2
25
24
19
4
1
26
3
6
5
7
8
28
10
11
12
14 131517
18
20
21
22
23
29
30
ITEM
NO.
Utica Boiler
MACF-150
1Coaxial Connector
2Flue Sensor
3Heat Exchanger
4Burner (not shown)
5Flame Detection Electrode
6Air/Gas Blend Manifold
7Venturi
8Fan
9Pump with Air Separator
10 DHW Priority Sensor
11 Flow Sensor with Water Filter
and Flow Restrictor
12 Boiler Drain Tap
13 Heating Return
14 Cold Water DHW Inlet
15 Gas Inlet
16 DHW Outlet
17 Heating Supply
18 Condensate Connection
19 DHW Heat Exchanger
20 NTC DHW Sensor
21 
22 3-Way Valve with Motor
23 Gas Valve
24 Water Safety Thermostat
25
NTC Heating sensor (Flow/Return)
QTY 2, (1 Shown for clarity)
26 Ignition Electrode
27 Pressure Switch
28 Pressure Relief Valve
29 Exhaust Test Port
30 Intake Test Port
240013371 REV B, [10/01/2021]
UTICA BOILER MACF-150

14
ITEM
NO.
Utica Boiler
MACF-205
1Coaxial Connector
2Flue Sensor
3Heat Exchanger
4Burner (not shown)
5Flame Detection Electrode
6Air/Gas Blend Manifold
7Fan
8Venturi
9Pump with Air Separator
10 DHW Priority Sensor
11 Flow Sensor with Water Filter
and Flow Restrictor
12 Heating Return
13 Cold Water DHW Inlet Tap
14 Gas Inlet
15 DHW Outlet
16 Heating Supply Connection
17 Condensate Connection
18 DHW Heat Exchanger
19 NTC DHW Sensor
20 
21 3-Way Valve with Motor
22 Gas Valve
23
NTC Heating sensor (Flow/Return)
QTY 2, (1 Shown for clarity)
24 Water Safety Thermostat
25 Ignition Electrode
26 Pressure Relief Valve
27 Exhaust Test Port
28 Intake Test Port
3 - COMPONENT LISTING
Illustrations are a depiction of the boiler for general location of parts and may vary depending on model.
9
15
2
24
23
18
4
1
25
3
6
5
7
8
26
10
11
13 1214
16
17
19
20
21
22
27
28
240013371 REV B, [10/01/2021]
UTICA BOILER MACF-205

15
4.1 Boiler Location Considerations
• Ambient room temperature always above 32°F
(0°C) to prevent freezing of liquid condensate.
• Approved for installation in closets or alcove
provided it is correctly designed for that purpose
and minimum clearances are met.
• Protect gas ignition system components from
water (dripping, spraying, rain, etc.) during
operation and service (circulator replacement,
condensate trap, control replacement, etc.).
• Access to outdoors to meet minimum and
maximum pipe lengths for combustion air and
vent piping. See section 5.
• Disposal of condensate. See section 5.
• Drainage of water (or water - antifreeze solution)
during boiler service or from safety relief valve
discharge. See section 6.
• Access to system water piping, gas supply, and
electrical service. See sections 6, 7 and 8.
• Clearances to combustible materials and service
clearances. See Table 1 and Figures pg. 16.
• Room-sealed boiler installed in a room containing
bath or shower shall be installed so person using
bath or shower cannot touch any electrical switch
or boiler control utilizing line voltage electricity.
• Multiple Boilers can be placed side by side, or
back to back.
• Observe service clearances in all installations.
• For Direct Vent installations, air vents are not
required in room boiler is installed in, or when
installed in closet or compartment.
• Requires fresh air intake piped from outdoors.
• 


be placed on the air intake section of the vent
pipe. Boiler performance at maximum vent length

• Use of unregulated gas (well gas) is not
manufacturer recommended with this boiler.
WARNING
Fire Hazard! Do not install on carpeting. Failure
to follow these instructions could result in death
or serious injury.
!
4 - LOCATING BOILER
4.2 Floor Location
• Place crated boiler as close to selected location as
possible and uncrate boiler. Boiler may be moved
into position with appliance dolly or (2) two wheel
hand truck. Insert dolly or hand truck under left
hand side of boiler. It is possible to slide boiler for

• Adjust the position of the boiler verify it is level
and plumb.
• Select level location central to piping systems
served and as close to vent and air intake
terminals as possible.
• Accessibility clearances, if more stringent (i.e.

clearances, must be used for boiler installation.
Accessibility clearances may be achieved with the
use of removable walls or partitions.
• Boiler is approved for installation in closets and
This boiler shall NOT be
installed on carpeting.
• Install equipment in location which facilitates
operation of venting and combustion air intake
piping systems as described in this manual.
• Advise owner to keep venting and combustion
air intake passages free of obstructions. Both
venting and combustion air intake piping systems

piping systems without restrictions for boiler
operation.
• Keep boiler area clean of debris and free of

liquids.
WARNING
Fire hazard. Do not install boiler on combustible

instructions could result in death or serious
injury.
!
WARNING
Fire, explosion, and asphyxiation hazard.
Improper installation could result in death or
serious injury. Read these instructions and
understand all requirements before beginning
installation.
!
240013371 REV B, [10/01/2021]

16
NOTE: Greater clearances for access should supersede

Minimum ClearanceMinimum Clearance
17 ¾ in. [450 mm ]17 ¾ in. [450 mm ]
From Front of BoilerFrom Front of Boiler
13.58 in /
345.00 mm
1212 inin
[305 mm][305 mm]
17  in
[450 mm]
8 ⅝in [220 mm]
40  in
[1.02 m]
100, 115,
125, & 150
13   in
[345 mm]
4.3 Clearances
11    inin
[45 mm][45 mm]
Left Side View of Boiler Front View of Boiler
Service Clearances
4 - LOCATING BOILER
1  in
[45 mm]
17in
Top ViewTop View
BackBack
Closet Installation
0 in /0 mm between Back of Unit and wall0 in /0 mm between Back of Unit and wall
1  in
[45 mm]
1in
[45 mm]
1in
[45 mm]
[450 mm]
Front View of Boiler
0in
[0 mm]
0in
[0 mm]
Top View
0in
[0 mm]
0in
[0 mm]
Combustible Clearances
TABLE 1: BOILER CLEARANCES
Dimension Combustible
Materials (1)
Manufacturer
Recommended for
Service(1)(2)
Top
0" (0 cm) 8-5/8" (220 mm)
Left Side
1-3/4" (45 mm) 12" (305 mm)
Right Side
1-3/4" (45 mm) 1-3/4" (45 mm)
Front
0" (0 mm) 17-3/4"(450 mm)
Back 0" (0 mm) 0" (0 mm)
Bottom 0" (0 mm) 0"(0 mm)
Combustion Air/Vent piping
0" (0 mm) 6" (160 mm)
(1) Required distances measured from boiler jacket.
(2) Service, proper operation clearance recommendation.
* Allowance for piping and venting not included.
165 & 205
23 ½in
[597 mm]
240013371 REV B, [10/01/2021]