AER MFC 3000 Installation manual

MFC Series Boilers Installation, Startup Operation
OMM-0104_0B AERCO International, Inc. •100 Oritani Dr. •Blauvelt, NY 10913 Page 1of 58
GF-148 Ph.: 800-526-0288 2/28/2018
GF-148
Installation, Startup Guide & Operation
Multi-Fuel Condensing Boilers
Latest Update: 2/28/2018
USER MANUAL
MFC 10000 shown
Applies to MFC
Series Models:
•MFC 3000
•MFC 4000
•MFC 5000
•MFC 6000
•MFC 8000
•MFC 10000
PENDING
Additional MFC Series Documentation:
•TAG-0077 GF-148-E MFC-Series Power- Application Guide
•TAG-0078 GF-148-G MFC Series Gas Oil-2 Application Guide
•TAG-0080 GF-146-V MFC Series Vent-Combust Air Application Guide
•TAG-0081 GF-148-B MFC Series Application Guide

MFC Series Boilers Installation, Startup Operation
CONTENTS
Page 2of 58 AERCO International, Inc. •100 Oritani Dr. •Blauvelt, NY 10913 OMM-0104_0B
2/28/2018 Ph.: 800-526-0288 GF-148
Table of Contents
FOREWORD........................................................................................................................................................ 3
SECTION 1: SAFETY PRECAUTIONS............................................................................................5
1.1 Warnings & Cautions ..................................................................................................................................... 5
1.2 Emergency Shutdown.................................................................................................................................... 6
1.3 Prolonged Shutdown ..................................................................................................................................... 6
1.4 Moving the MFC Boiler.................................................................................................................................. 7
1.5 Massachusetts Installations........................................................................................................................... 8
SECTION 2: INTRODUCTION........................................................................................................11
2.1 General Features ......................................................................................................................................... 11
2.2 Certification References and Compliance ................................................................................................... 11
2.3 General Technical Specifications ................................................................................................................. 12
SECTION 3: INSTALLATION.........................................................................................................15
3.1 Site Preparation........................................................................................................................................... 15
Electrical Requirements ........................................................................................................................ 153.1.1
Natural Gas Requirements.................................................................................................................... 153.1.2
Installation Clearances.......................................................................................................................... 153.1.3
3.2 Installation - Site.......................................................................................................................................... 17
3.3 Boiler Room ................................................................................................................................................. 17
3.4 Flue .............................................................................................................................................................. 18
3.5 Water Connections...................................................................................................................................... 18
3.6 Electrical Connections ................................................................................................................................. 19
3.7 Burner Door Opening Orientation............................................................................................................... 20
3.8 Reversing the Opening Direction of the Burner Door ................................................................................. 21
3.9 Adjusting the Boiler Door – Vertical and Horizontal ................................................................................... 23
3.10 Condensate Trap Installation..................................................................................................................... 26
3.11 Control & Safety Devices ........................................................................................................................... 27
3.12 Burner/Blower ........................................................................................................................................... 28
Introduction ........................................................................................................................................ 283.12.1
Requirements...................................................................................................................................... 293.12.2
Checking the Insulating Material ........................................................................................................ 293.12.3
3.13 Gas Train Installation................................................................................................................................. 30
SECTION 4: STARTUP..................................................................................................................31
4.1 Preliminary Checks ...................................................................................................................................... 31
4.2 Water Treatment......................................................................................................................................... 31
Scaling ................................................................................................................................................... 314.2.1
Corrosion on the Water Side ................................................................................................................ 314.2.2
4.3 Filling the System......................................................................................................................................... 32
4.4 Combustion Calibration Guidelines............................................................................................................. 32
Natural Gas ........................................................................................................................................... 324.4.1
Oil .......................................................................................................................................................... 324.4.2
SECTION 5: MFC SERIES MAINTENANCE..................................................................................33
5.1 Preparation for Inspection and Maintenance ............................................................................................. 33
5.2 Standard Maintenance ................................................................................................................................ 34
4th Pass Inspection and Cleaning ......................................................................................................... 355.2.1
5.3 Burner Maintenance.................................................................................................................................... 36
APPENDIX A – ELECTRICAL DIAGRAMS ......................................................................................37
A1. MFC 3000 / 4000 / 5000 / 6000 Electrical Diagrams 1-8 ........................................................................... 38
A2. MFC 8000-10000 - Electrical Diagrams 1-9 ................................................................................................ 47

MFC Series Boilers Installation, Startup Operation
FORWARD
OMM-0104_0B AERCO International, Inc. •100 Oritani Dr. •Blauvelt, NY 10913 Page 3of 58
GF-148 Ph.: 800-526-0288 2/28/2018
Foreword
The AERCO MFC Series boilers are modulating and condensing units. The MFC Series
represents a true industry advancement that meets the needs of today's energy and
environmental concerns. Designed for application in any closed loop hydronic system, the MFC
Series modulating capability relates energy input directly to fluctuating system loads. The
maximum turn down ratio for these units is 5:1. The MFC Series provides extremely high
efficiency and makes it ideally suited for modern low temperature, as well as, conventional
heating systems and higher temperature systems (up to 230°F).
The MFC Series operates within the following input and output ranges:
MFC Series INPUT and OUTPUT RANGES (Btu/Hr.)
MODEL INPUT RANGE (BTU/HR.) OUTPUT RANGE (BTU/HR.) at High Fire Rate
*
Min. Max. Min. Max.
MFC 3000 600,000 3,000,000 2,565,000 2,826,000
MFC 4000 800,000 4,000,000 3,420,000 3,768,000
MFC 5000 1,000,000 5,000,000 4,275,000 4,710,000
MFC 6000 1,200,000 6,000,000 5,130,000 5,652,000
MFC 8000 1,600,000 8,000,000 6,840,000 7,536,000
MFC 10000 2,000,000 10,000,000 8,550,000 9,420,000
*Output based on a supply temperature of 100°F.
Whether used in singular or modular arrangements, the MFC Series offers the maximum
venting flexibility with minimum installation space requirements. These Boilers are Category II
and IV, positive pressure appliances. Single and/or multiple breeched units are capable of
operation in the following vent configurations:
•Room Combustion Air:
oVertical Discharge
oHorizontal Discharge
•Ducted Combustion Air:
oVertical Discharge
oHorizontal Discharge
These boilers are capable of being vented utilizing AL29-4C vent systems only.
The available burner’s advanced electronics are available with several selectable modes of
operation offering the most efficient operating methods and energy management system
integration.
IMPORTANT:
Unless otherwise specified, all descriptions and procedures provided in this Installation,
Operation & Maintenance Manual apply to the MFC Series boilers.

MFC Series Boilers Installation, Startup Operation
FORWARD
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MFC Series Boilers Installation, Startup Operation
SECTION 1: SAFETY PRECAUTIONS
OMM-0104_0B AERCO International, Inc. •100 Oritani Dr. •Blauvelt, NY 10913 Page 5of 58
GF-148 Ph.: 800-526-0288 2/28/2018
SECTION 1: SAFETY PRECAUTIONS
1.1 Warnings & Cautions
Installers and operating personnel MUST, at all times, observe all safety regulations. The
following warnings and cautions are general and must be given the same attention as specific
precautions included in these instructions. In addition to all the requirements included in this
AERCO Instruction Manual, the installation of units MUST conform with local building codes, or,
in the absence of local codes, ANSI Z223.1 (National Fuel Gas Code Publication No. NFPA-54)
for gas-fired boilers and ANSI/NFPASB for LP gas-fired boilers, as well as NFPA 31 “Standard
for the Installation of Oil-Burning Equipment”, and NFPA 54 for gas piping compliance
requirements. Where applicable, the equipment shall be installed in accordance with the current
Installation Code for Gas Burning Appliances and Equipment, CSA B149.1, and applicable
Provincial regulations for the class; which should be carefully followed in all cases. Authorities
having jurisdiction should be consulted before installations are made.
If installing within the Commonwealth of Massachusetts, see Section 1.4 for important
information regarding installation of units.
IMPORTANT:
This Instruction Manual is an integral part of the product and must be maintained in legible
condition. It must be given to the user by the installer and kept in a safe place for future
reference.
WARNING!
•Do not use matches, candles, flames, or other sources of ignition to check for gas leaks.
•Fluids under pressure may cause injury to personnel or damage to equipment when
released. Be sure to shut off all incoming and outgoing water shutoff valves. Carefully
decrease all trapped pressures to zero before performing maintenance.
•Before attempting to perform any maintenance on the unit, shut off all gas and electrical
inputs to the unit.
•The exhaust vent pipe of the unit may operate under a positive pressure and therefore
must be completely sealed to prevent leakage of combustion products into living spaces.
•Electrical voltages up to 575 VAC may be used in this equipment. Therefore the burner
cover and all other junction boxes must be installed at all times, except during
maintenance and servicing.
•A three-pole switch must be installed on the electrical supply line of the unit. The switch
must be installed in an easily accessible position to quickly and safely disconnect
electrical service. Do not affix switch to unit or burner enclosures.
CAUTION!
•Many soaps used for gas pipe leak testing are corrosive to metals. The piping must be
rinsed thoroughly with clean water after leak checks have been completed.
•DO NOT use this boiler if any part has been under water. Call a qualified service
technician to inspect and replace any part that has been under water.

MFC Series Boilers Installation, Startup Operation
SECTION 1: SAFETY PRECAUTIONS
Page 6of 58 AERCO International, Inc. •100 Oritani Dr. •Blauvelt, NY 10913 OMM-0104_0B
2/28/2018 Ph.: 800-526-0288 GF-148
1.2 Emergency Shutdown
If overheating occurs or the gas supply fails to shut off, close the manual gas shutoff valve
(Figure 1-1) located external to the unit.
NOTE:
The Installer must identify and indicate the location of the emergency shutdown manual gas
valve to operating personnel.
Figure 1-1: Manual Gas Shutoff Valve
1.3 Prolonged Shutdown
If the boiler is to be taken out of service for an extended period of time (one year or more),
perform the following procedure.
Shutting Boiler Down for Extended Period
1. Set ON/OFF switch on the front panel to the OFF position to shut down the boiler’s
operating controls.
2. Disconnect AC power from the unit.
3. Close the water supply and return valves to isolate boiler.
4. Close external gas supply valve.
5. Open relief valve to vent water pressure.
To bring the boiler back into service after a prolonged shutdown (one year or more), the
following procedures must be followed:
Placing Boiler in Service After Long Shutdown
1. Review installation requirements included in Chapter 3.
2. Inspect all piping and connections to the unit.
3. Inspect exhaust vent and air inlet duct work (if applicable).
4. Perform initial startup per Chapter 5.
5. Perform scheduled maintenance procedures per Chapters 5 of this manual.

MFC Series Boilers Installation, Startup Operation
SECTION 1: SAFETY PRECAUTIONS
OMM-0104_0B AERCO International, Inc. •100 Oritani Dr. •Blauvelt, NY 10913 Page 7of 58
GF-148 Ph.: 800-526-0288 2/28/2018
1.4 Moving the MFC Boiler
When the units is received from the carrier, it should be completely inspected for evidence of
shipping damage and shipment completeness before the bill of lading is signed.
Carefully unpack the unit, taking care not to damage the unit enclose when cutting away the
packaging materials.
For packaged boilers, the Riello gas train is shipped loose and must be installed and wired in
the field.
Boiler Weight – in pounds (kg)
MFC 3000 MFC 4000 MFC 5000 MFC 6000 MFC 8000 MFC
10000
Boiler & Riello Burner
7,300
10,160
11,063
13,137
16,645
18,520
(3,311)
(4,608)
(5,018)
(5,959)
(7,550)
(8,401)
Bare Boiler (burner
supplied by other)
7,067
9,910
10,813
12,887
16,149
18,024
(3,206)
(4,495)
(4,905)
(5,845)
(7,325)
(8,176)
The unit must be moved with the proper rigging equipment for safety and to avoid equipment
damage (see Figure 1-2 for lifting points). A properly size forklift or other necessary equipment
will be required in order to safely move the MFC boilers and avoid equipment damage.
Figure 1-2: MFC Boiler Lifting Points
LIFTING POINTS

MFC Series Boilers Installation, Startup Operation
SECTION 1: SAFETY PRECAUTIONS
Page 8of 58 AERCO International, Inc. •100 Oritani Dr. •Blauvelt, NY 10913 OMM-0104_0B
2/28/2018 Ph.: 800-526-0288 GF-148
1.5 Massachusetts Installations
Boiler installations within the Commonwealth of Massachusetts must conform to the following
requirements:
•Boiler must be installed by a plumber or a gas fitter who is licensed within the
Commonwealth of Massachusetts.
•Prior to unit operation, the complete gas train and all connections must be leak tested
using a non-corrosive soap.
•The vent termination must be located a minimum of 4 feet above grade level. If side-wall
venting is used, the installation must conform to the following requirements extracted
from 248 CMR 5.08 (2):
(a) For all side wall horizontally vented gas fueled equipment installed in every dwelling,
building or structure used in whole or in part for residential purposes, including those owned
or operated by the Commonwealth and where the side wall exhaust vent termination is less
than seven (7) feet above finished grade in the area of the venting, including but not limited
to decks and porches, the following requirements shall be satisfied:
•INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of installation of
the side wall horizontal vented gas fueled equipment, the installing plumber or gasfitter
shall observe that a hard wired carbon monoxide detector with an alarm and battery back-
up is installed on the floor level where the gas equipment is to be installed. In addition, the
installing plumber or gasfitter shall observe that a battery operated or hard wired carbon
monoxide detector with an alarm is installed on each additional level of the dwelling,
building or structure served by the side wall horizontal vented gas fueled equipment. It
shall be the responsibility of the property owner to secure the services of qualified
licensed professionals for the installation of hard wired carbon monoxide detectors.
a. In the event that the side wall horizontally vented gas fueled equipment is installed in
a crawl space or an attic, the hard wired carbon monoxide detector with alarm and
battery back-up may be installed on the next adjacent floor level.
b. In the event that the requirements of this subdivision can not be met at the time of
completion of installation, the owner shall have a period of thirty (30) days to comply
with the above requirements; provided, however, that during said thirty (30) day
period, a battery operated carbon monoxide detector with an alarm shall be installed.
1. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as
required in accordance with the above provisions shall comply with NFPA 720 and be
ANSI/UL 2034 listed and IAS certified.
2. SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the
exterior of the building at a minimum height of eight (8) feet above grade directly in line with
the exhaust vent terminal for the horizontally vented gas fueled heating appliance or
equipment. The sign shall read, in print size no less than one-half (1/2) inch in size, "GAS
VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS".
3. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas
fueled equipment shall not approve the installation unless, upon inspection, the inspector
observes carbon monoxide detectors and signage installed in accordance with the
provisions of 248 CMR 5.08(2)(a)1 through 4.
(b) EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through
4:

MFC Series Boilers Installation, Startup Operation
SECTION 1: SAFETY PRECAUTIONS
OMM-0104_0B AERCO International, Inc. •100 Oritani Dr. •Blauvelt, NY 10913 Page 9of 58
GF-148 Ph.: 800-526-0288 2/28/2018
1. The equipment listed in Chapter 10 entitled "Equipment Not Required To Be Vented" in
the most current edition of NFPA 54 as adopted by the Board; and
2. Product Approved side wall horizontally vented gas fueled equipment installed in a room
or structure separate from the dwelling, building or structure used in whole or in part for
residential purposes.
(c) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDED.
When the manufacturer of Product Approved side wall horizontally vented gas equipment
provides a venting system design or venting system components with the equipment, the
instructions provided by the manufacturer for installation of the equipment and the venting
system shall include:
1. Detailed instructions for the installation of the venting system design or the venting
system components; and
2. A complete parts list for the venting system design or venting system.
(d) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT
PROVIDED. When the manufacturer of a Product Approved side wall horizontally vented
gas fueled equipment does not provide the parts for venting the flue gases, but identifies
"special venting systems", the following requirements shall be satisfied by the manufacturer:
1. The referenced "special venting system" instructions shall be included with the appliance
or equipment installation instructions; and
2. The "special venting systems" shall be Product Approved by the Board, and the
instructions for that system shall include a parts list and detailed installation instructions.
(e) A copy of all installation instructions for all Product Approved side wall horizontally vented
gas fueled equipment, all venting instructions, all parts lists for venting instructions, and/or
all venting design instructions shall remain with the appliance or equipment at the
completion of the installation.
____________________________________________________________________________
[End of Extracted Information From 248 CMR 5.08 (2)]

MFC Series Boilers Installation, Startup Operation
SECTION 1: SAFETY PRECAUTIONS
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MFC Series Boilers Installation, Startup Operation
SECTION 2: INTRODUCTIONS
OMM-0104_0B AERCO International, Inc. •100 Oritani Dr. •Blauvelt, NY 10913 Page 11 of 58
GF-148 Ph.: 800-526-0288 2/28/2018
SECTION 2: INTRODUCTION
2.1 General Features
The AERCO Multi-Fuel Condensing (MFC) Fire Tube Water Boiler is designed for condensing
application in any closed loop hydronic system. It features a proven 4-pass fire tube heat
exchanger design for maximum heat transfer and efficiency. The heat exchanger’s combination
of high quality carbon steel/316Ti stainless steel construction ensures the highest degree of
durability. The 316Ti SS construction in the heat exchanger’s 4th pass offers superior corrosion
resistance against acidic flue gas condensation. Likewise, it can be fired with multiple fuels
including natural gas, propane or #2 fuel oil (as backup), offering dual fuel flexibility. Moreover,
the MFC series features dual return connections standard for optimal application flexibility and
seasonal efficiency gains of up to 10%. The heat exchanger’s maximum working temperature of
240°F allows for greater operating temperature range and meet the requirements of higher
temperature applications when necessary, but allows for the building to reset water temperature
for condensing in the shoulder months.
2.2 Certification References and Compliance
Each boiler and Stainless Steel 4th Pass is provided with a manufacture plate that can be
found in the envelope with the boiler documents. The plate lists:
Manufacturer Plate Information
BOILER
STAINLESS STEEL 4TH PASS
Serial Number Serial Number
Minimum Relief Valve Capacity Maximum Water Temperature
Heating Surface Area
Maximum Operating Pressure
Maximum Water Temperature
Maximum Operating Pressure
The installation must be performed in compliance with the regulations in force by
professionally qualified personnel. The term “professionally qualified personnel” means
persons with specific technical skills in the sector of heating system components. Incorrect
installation may cause damage to persons, animals or objects for which the manufacturer
cannot be held responsible.
At the first start up, all regulation and control devices positioned on the control panel should
be checked for proper operation.
The warranty shall be valid only upon compliance with the instruction given in this manual.
The AERCO MFC Series boilers have been built and tested in observance of ASME
requirements and UL when ordered with a factory supplied burner.

MFC Series Boilers Installation, Startup Operation
SECTION 2: INTRODUCTIONS
Page 12 of 58 AERCO International, Inc. •100 Oritani Dr. •Blauvelt, NY 10913 OMM-0104_0B
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2.3 General Technical Specifications
MFC Series General Technical Specifications, for MFC Models:
3000
4000
5000
6000
8000
10000
Boiler Category
ASME Section IV
Max. Allowed Working Pressure
80 PSIG
Max. Working Temperature
240°F
Gas Connections (NPT)
2”
2”
2’’
2’’
3’’ (Flange)
3’’ (Flange)
Oil Connections
0.375”
0.375”
0.5”
0.5”
0.5”
0.5”
Max. Gas Pressure
1 psi
2 psi
Min. Gas Pressure 1
14”
1 psi
Max #2 Fuel Oil Consumption Flowrate
(GPH)
21.4 28.6 35.7 42.9 57.1 71.4
#2 Fuel Oil Supply Flow Rate
85
150
150
150
218
218
Electrical Req. 208V/3PH/60Hz 2, 3
11.4 FLA
16.8 FLA
16.8 FLA
16.8 FLA
25.8 FLA
25.8 FLA
Electrical Req. 460V/3PH/60Hz 2, 3
5.8 FLA
7.6 FLA
7.6 FLA
7.6 FLA
11.7 FLA
11.7 FLA
Electrical Req. 575V/3PH/60Hz 2,3
4.5 FLA
6.2 FLA
6.2 FLA
6.2 FLA
10.2 FLA
10.2 FLA
Control Circuit 120V/1PH/60Hz 2, 3
6.8 FLA
Water Connections (Flanged)
4’’
6”
6”
6”
8”
8”
Dual Return Water Connection
Yes
Min. Water Flow (GPM)4
0 / 19
0 / 25
0 / 31
0 / 38
0 / 50
0 / 62
Max. Water Flow (GPM)
350
520
610
700
890
1100
Water Volume Gallons
407
464
518
724
898
1043
Water Pressure Drop
2.4 PSIG
@300 GPM
1 PSIG
@400 GPM
1.3 PSIG
@500 GPM
1.9 PSIG
@600 GPM
1.1 PSIG
@800 GPM
1.7 PSIG
@1000 GPM
Turndown (Natural Gas/Propane)
Up to 5:1 (20%)
Turndown (#2 Fuel Oil)
Progressive 2-Stage
Vent/Air Intake Connections
10 Inch
12 Inch
12 Inch
14 Inch
16 Inch
16 Inch
Vent Materials
AL29-4C
Type of Fuel
Natural Gas, Propane, #2 Fuel Oil (backup)
NOx Emission on Nat. Gas
30 ppm
30 ppm
30 ppm
30 ppm
40 ppm
40 ppm
Temperature Control Range
125ºF to 230ºF
Ambient Temperature Range
32ºFto140ºF (Preliminary)
Standard Listings & Approvals
UL, CUL, CSD-1, ASME, AHRI(pending)
Gas Train Operations
FM Compliant
Weight (dry) Lbs.
7,300
10,160
11,063
13,137
16,645
18,520
Weight (wet) Lbs.
10,694
14,030
15,383
19,175
24,134
27,219
Shipping Weight Lbs.
7,300
10,160
11,063
13,137
16,645
18,520
NOTES:
1Values are for Natural Gas FM Compliant 2” gas trains available with Riello Dual Fuel (light oil/gas)
burners. Additional gas train sizes added gas pressure ranges are available. Consult factory or see MFC
Series Gas/Oil Components & Supply Design Guide GF-148-G for additional model gas train minimum
gas pressure requirements.
2See the MFC Electrical Power Guide, GF-148-E, for Service Disconnect Switch amperage requirements.
3Values are for Riello Dual Fuel (light oil/gas) RLS 120-300 models. Consult MFC Electrical Power Guide,
GF-148-E, for additional model and power requirements.
4Zero flow allowed during warm-up period of 5 minutes maximum. The second number is the minimum
flow after the warm-up period and represents the boiler firing at the minimum input with a 60 degree delta
T across the heat exchanger.

MFC Series Boilers Installation, Startup Operation
SECTION 2: INTRODUCTIONS
OMM-0104_0B AERCO International, Inc. •100 Oritani Dr. •Blauvelt, NY 10913 Page 13 of 58
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MFC Series Dimensions
Model
A
(Width)
B
(Length)
C
(Height)
D E F G H I J K L M N O P Q R
S
(REF)
T
MFC
3000
54.3” 171.5” 84.0” 63.0
”
126.0”
6.6” 72.9
”
0.6
”
12.6
”
35.2
”
73.0
”
48.9
”
7.1
”
2.6” 18.1
”
6.5
”
27.6
”
6.9
”
27.2
”
2.1
”
MFC
4000 58.7" 174.1” 88.3” 66.1
”
130.9”
7.3” 75.4
”
4.5
”
16.2
”
36.2
”
76.2
”
48.9
”
5.5
”
2.6” 17.3
”
6.4
”
27.4
”
6.9
”
29.3
”
2.1
”
MFC
5000
58.7" 186.3” 88.3” 66.1
”
143.0”
7.3” 75.4
”
4.5
”
16.2
”
36.2
”
76.2
”
49.3
”
5.5
”
2.6” 17.3
”
6.4
”
35.6
”
6.9
”
29.3
”
2.1
MFC
6000
70.9" 192.9” 101.1” 76.8 145.7 8.5” 87.1 3.1 22.8 40.9 86.8 50.8 6.5 ** 21.1 6.6 53.2 6.7 35.4 2.1
MFC
8000 70.9" 220.4” 102.3” 76.8
165.4”
8.5” 87.1 7.8 22.8 40.9 86.8 53.8 5.0 3.1 18.1 7.2
”
55.9 7.1 35.4 2.1
MFC
10000
70.9” 240.0” 102.3” 76.8
185.0”
8.5” 87.1 7.8 22.8 40.9 86.8 52.7 5.0 3.1 18.0 7.2 70.9 7.9 35.4 2.1
*Dimensions and information for #2 fuel oil connections can be found in the Riello manual.
**MFC 6000 includes an 8” x 6” reducer. The reducer goes past the frame 4.0”.
Figure 2-1: MFC Series Dimensional Drawing
SYSTEM
SUPPLY
RELIEF VALVE
CONNECTION
2” NPT
A
D
GAS CONNECTION
MFC3000-6000 : 2” NPT
MFC8000-10000 : 3” NPT FLANGED
ANCHORING
POINTS
LOW TEMP
RETURN
HIGH TEMP
RETURN
FLUE/VENT
CONNECTION
S (REF)
4th PASS
ANCHORING
POINTS
C
G
I
BOILER
DRAIN
CONDENSATE
DRAIN
F
H
J
FOR MFC3000-5000 : 3” INSPECTION HOLE
FOR MFC6000-10000 : 16” MANHOLE

MFC Series Boilers Installation, Startup Operation
SECTION 2: INTRODUCTIONS
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MFC Series Boilers Installation, Startup Operation
SECTION 4: STARTUP
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SECTION 3: INSTALLATION
3.1 Site Preparation
Electrical Requirements3.1.1
(Refer to MFC Electrical Guide; GF-148-E / TAG-0077)
MFC Series boilers require 3∅for the burner and include a step-down transformer as standard
to provide 120VAC power to the control portion of the burner. Voltage requirements for each
model are shown in the tables below:
Multi-Fuel (Gas-Oil) Power Requirements (Amperage)
MFC
Burner
208/3∅/60
460/3∅/60
575/3∅/60
3000
RLS120
20.0
15.0
15.0
4000
RLS160
30.0
15.0
15.0
5000
RLS160
30.0
15.0
15.0
6000
RLS160
30.0
15.0
15.0
8000
RLS300
40.0
20.0
15.0
10000
RLS300
40.0
20.0
15.0
Gas Burner Power Requirements (Amperage)
MFC
Burner
208/3∅/60
460/3∅/60
575/3∅/60
3000
RS68
15.0
15.0
15.0
4000
RS120
15.0
15.0
15.0
5000
RS160
15.0
15.0
15.0
6000
RS160
20.0
15.0
15.0
8000
RS300
30.0
15.0
15.0
10000
RS300
30.0
15.0
15.0
Natural Gas Requirements3.1.2
(Refer to MFC Fuel Guide; GF-148-G / TAG-0078)
MFC boilers must have access to a Natural Gas line with the following minimum pressures with
the unit at FULL FIRE:
•MFC 3000 – 5000 = 14” W.C.
•MFC 6000 – 10000 = 1 psi.
Installation Clearances3.1.3
The MFC series boiler dimensions and minimum acceptable clearances are shown in Figures 3-
1 and 3-2. The minimum clearance dimensions, required by AERCO, are listed below. However,
if Local Building Codes require additional clearances, these codes shall supersede AERCO’s
requirements. Minimum acceptable clearances required are as follows:

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•FRONT: = 24 inches (610 mm) (From front of blower).
NOTE: 24” is a minimum requirement per NFPA. If a tube must be replaced, the
following minimum front door clearances are required:
MODEL DISTANCE
MFC 3000 70" (1778 mm)
MFC 4000 70" (1778 mm)
MFC 5000 80" (2032 mm)
MFC 6000
85" (2159 mm)
MFC 8000
105" (2667 mm)
MFC 10000 122" (3099 mm)
•SIDES: = 24 inches (610 mm)
•REAR: = 24 inches (610 mm)
•TOP: = 12 inches (457 mm) from top of secondary inlet (high temp.) pipe connection.
NOTE:
MFC Series boilers may be installed side by side with a minimum 6" side clearance, as long
as there is access to the rear of the units. Note the necessary burner door orientation per
Figure 3-2. The perimeter clearances still apply. The door hinge will need to be reversed on
one of the paired units. Refer to Section 3.8 for instructions on how to reverse the opening
direction of the door.
All gas piping, water piping and electrical conduit or cable must be arranged so that they do not
interfere with the removal of any panels, or inhibit service or maintenance of the unit.
Figure 3-1: MFC Series – Single Unit Installation Clearances

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Figure 3-2: MFC Series – Multiple Unit Installation Clearances
WARNING:
Keep the unit area clear and free from all combustible materials and flammable vapors or
liquids.
FOR MASSACHUSETTS ONLY:
For Massachusetts installations, the unit must be installed by a plumber or gas-fitter that is
licensed within the Commonwealth of Massachusetts. In addition, the installation must
comply with all requirements specified in Chapter 1 – Safety Precautions.
3.2 Installation - Site
MFC Boilers must be installed on a 4” pad, minimum, to enable the condensate to drain.
Before connecting the boiler, perform the following operations:
• Thoroughly clean all the system pipes in order to remove any foreign matter that could affect
correct operation of the boiler.
• Check that the flue has no narrowing of passages and that it is free from debris; also
check that other appliances do not discharge into the flue. See the regulations in force.
3.3 Boiler Room
Current regulations must always be observed. Premises in which boilers will be installed should
be sufficiently ventilated and permit access for maintenance operations.

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3.4 Flue
The exhaust flue must be dimensioned as to applicable regulations. See the MFC Series
Venting Guide, GF-148-V for venting installation instructions and guidelines.
3.5 Water Connections
NOTE:
Refer to the MFC Series Boiler Application Guide, OMM-0081 (GF-148-B) for specific
guidelines regarding installation of a variety of different water piping configurations and
applications. The following are general guidelines only.
Refer to Figure 3-3 for component identification in a sealed hot water heating system with an
expansion tank. This figure also shows an example of MFC Series water connections. Ensure
that the hydraulic pressure measured after the reduction valve on the supply pipe does not
exceed the operating pressure specified on the rating plate of the boiler.
•As the water contained in the heating system increases in pressure during operation, ensure
that its maximum value does not exceed the maximum hydraulic pressure specified on the
component rating plate.
•Ensure that the safety valve outlets of the boiler and hot water tank, if any, are piped to
within 12 inches (30.5 cm) of the floor to prevent injury in the event of a discharge.
•Ensure that the pipes of the water and heating system are not used as an earth connection
for the electrical system as this can seriously and very rapidly damage the pipes, boiler,
heater and radiators.
•Once the heating system has been filled, you are advised to close the supply cock and keep
it closed so that any leaks from the system will be identified by a drop in hydraulic pressure
indicated on the system pressure gauge.
Figure 3-3: MFC Series – Water Connections and Components Example
See Section 3.13 for
gas train installation
instructions.

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3.6 Electrical Connections
Electrical systems of thermal plants designed only for heating purposes must comply with
numerous legal regulations which apply in general as well as specifically to each application or
fuel type.
Each unit must be connected to a dedicated electrical circuit. NO OTHER DEVICES SHOULD
BE ON THE SAME ELECTRICAL CIRCUIT AS THE BOILER.
A three-pole switch must be installed on the electrical supply line in an easily accessible location
to quickly and safely disconnect electrical service. DO NOT attach the switch to sheet metal
enclosures of the unit.
After placing the unit in service, the ignition safety shutoff device must be tested. If an external
electrical power source is used, the installed boiler must be electrically bonded to ground in
accordance with the requirements of the authority having jurisdiction. In the absence of such
requirements, the installation shall conform to National Electrical Code (NEC), ANSI/NFPA 70
and/or the Canadian Electrical Code (CEC) Part I, CSA C22.1 Electrical Code.

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3.7 Burner Door Opening Orientation
The boiler door is installed at the factory with standard opening from the left and with functioning
hinges on the right. Refer to Figure 3-4 and note the difference in door fixing hardware.
The opening-side features two large barrel nuts featuring a horizontal hole on the head for use
with the door opening tool, as well as a washer under each. The hinge side features two large
barrel nuts with keyed heads that are only removable using a wrench, and should never be
removed unless the door opening is being reversed.
FACTORY INSTALLED
DOOR CONFIGURATION
Opens from the left, with
functioning hinges on the right.
Figure 3-4: Factory Installed Burner Door Hardware Configuration
HINGE-SIDE
OPENING-SIDE
SAME HINGES ON BOTH SIDES
USES OPENING TOOL
USES WRENCH
OPENING-SIDE
WASHER & NUT
HINGE-SIDE
NUT