Patterson-Kelley P-K MACH CM300 Operating instructions

&
P-K MACH®/ NURO®GAS FIRED BOILER
Natural Gas or Propane Gas
CM300, CM399, CM500
C750, C900, C1050
Dual Fuel
C750GG, C900GG, C1050GG
Part # 1004905980
C.S.A Design-Certified
Complies with ANSI Z21.13/CSA 4.9
Gas-Fired Low Pressure Steam and Hot Water Boilers
C.S.A Design-Certified
Complies with ANSI Z21.13/CSA 4.9
Gas-Fired Low Pressure Steam and Hot Water Boilers
ASME Code, Section IV
Certified by Patterson-Kelley
Model Number:
Serial Number:
Start-Up Date: ___________________________
Patterson-Kelley
155 Burson Street
East Stroudsburg, PA 18301
Telephone: [phone]
Toll Free: 877.728.5351
Fax: [phone]
www.pattersonkelley.com
Revised January 3, 2020
INS T ALL A TION
& OWNER ’ S
MAN U A L
INS T ALL A TION
& OWNER ’ S
MAN U A L
INS T ALL A TION
& OWNER ’ S
MAN U A L
INS T ALL A TION
& OWNER ’ S
MAN U A L
INS T ALL A TION
& OWNER ’ S
MAN U A L
INS T ALL A TION
& OWNER ’ S
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& OWNER ’ S
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& OWNER ’ S
MAN U A L
Patterson-Kelley 2020: All Rights Reserved.
The information in this manual is the property of Patterson-Kelley. The descriptions and specifications contained in this manual were in effect at the time
this manual was approved for publication. While Patterson-Kelley will continue to support earlier model boilers to within a reasonable time limit, we
reserve the right to discontinue models and replacement parts at any time or change specifications or design without notice and without incurring any
obligation

P-K MACH®Gas Fired Boiler
Technical Service 1.877.728.5351

P-K MACH®Gas Fired Boiler
Technical Service 1.877.728.5351
&
Safety
General
P-K MACH®CM300, CM399, CM500, C750, C900, C1050
All P-K MACH®CM300, CM399, CM500, C750, C900 and C1050
Gas-Fired Boilers must be:
•Installed, operated, and serviced in accordance with
instructions contained in this manual and other supplemental
manuals.
•Installed by qualified personnel in accordance with designs
prepared by qualified facility engineers including: structural,
mechanical, electrical, and other applicable disciplines.
•Operated and serviced in accordance with a comprehensive
safety program determined and established by the customer.
Do not attempt to operate or service until such a program
has been established.
•Operated and serviced by experienced, qualified, and
properly trained personnel in accordance with all applicable
codes, laws, and regulations.
Safety Precautions
Provide a suitable location for the boiler, away from normal
personnel traffic, with adequate working space, adequate
clearances, proper ventilation and lighting, with a structure
sufficiently strong and rigid to support the weight of the boiler, all
piping, and accessories.
NOTICE!
Each safety device must be
maintained and checked per the
recommended schedule. Refer to
6 Maintenance.
SAFETY FEATURES
It is the responsibility of the
customer to ensure external
safety provisions, such as but not
limited to: guards, safety labels,
safety controls, interlocks, lockout
devices are in place and operable.
SAFETY LABELS
The following words are used in
this manual to denote the degree
of seriousness of the individual
hazards.
Indicates an imminently
hazardous situation which,
if not avoided, will result in
death or serious injury. This
signal word is to be limited
to the most extreme
situations.
Indicates a potentially
hazardous situation which, if
not avoided, could result in
death or serious injury.
Indicates a potentially
hazardous situation which, if
not avoided, may result in
minor or moderate injury. It
may also be used to alert
against unsafe practices.
NOTICE/NOTE -NOTICE
Is the preferred signal word to
address practices not related to
personal injury. The safety alert
symbol is not used with this signal
word.

P-K MACH®Gas Fired Boiler
Technical Service 1.877.728.5351
NOTICE!
The safety labels shown below are
affixed to your boiler. Although the
labels are of high quality, they may
become dislodged or unreadable
over time. Contact Patterson-
Kelley at 570.476.7261 or toll-free
at 877.728.5351 for replacements.
Gas may lose its odor. Proper gas
sensing equipment and procedures
should be used for leak checks.
Failure to detect gas leaks could
result in injury or death.
Training
Proper training is the best protection against accidents. It is
essential to read, understand, and follow the recommendations of
this manual before installing, operating, or servicing this equipment.
Failure to do so could result in fire or explosion and serious injury,
death, and/or property damage.
Operating and service personnel must be thoroughly familiar with
the basic construction of the CM300-CM399-CM500 and C750-
C900-C1050 boilers, the use and locations of the controls, the
operation of the boilers, adjustment of their various mechanisms,
and all applicable safety precautions. If any of the provisions of
this manual are not fully and completely understood, contact
Patterson-Kelley Technical Service at 570.476.7261 or toll free at
877.728.5351.
Hazard Warnings
Electrical Hazards
Shock Hazard! Properly lockout/tagout the
electrical service and all other energy sources before
working on or near the boiler.
Shock Hazard! Do not spray water directly on this
boiler or any electrical components.
Electrical Hazard! Do not alter wiring connections.
Crush Hazards
Lifting Hazards! Use properly rated lifting
equipment to lift and position the boiler. The load is
unbalanced. Test the balance before lifting off the
floor. Do not allow personnel beneath the lifted load.
Refer to the approximate weights in the table.
Single Fuel
Boiler Model
Weight in
Pounds
Dual Fuel
Boiler Model
Weight in
Pounds
CM300
400
N/A
N/A
CM399
420
N/A
N/A
CM500
440
N/A
N/A
C750
750
C750GG
770
C900
780
C900GG
800
C1050
820
C1050GG
840
Bump Hazard from Overhead Ductwork and Piping
Injury Hazard! Install components with adequate vertical clearance.
Pressure Hazards
Pressure Hazard! Hot fluids. Install isolation valves on boiler water inlet and outlet.
Make sure isolation valves are closed before servicing boiler.
Pressure Hazard! Hot fluids. Annually test safety relief valve(s) for proper operation. Do
not operate boiler with faulty relief valve(s).

P-K MACH®Gas Fired Boiler
Technical Service 1.877.728.5351
Slip, Fall Hazards
Tripping Hazard! Do not install piping on floor surfaces. Maintain a clear path around the
boiler.
Slip and Fall Hazard! Use a drip pan to catch water while draining the boiler. Maintain
dry floor surfaces.
Slip and Fall Hazard! Do not locate intake or exhaust terminations above a walkway;
dripping of condensate can cause icing of the walking surface. Refer to Sections 2.5.5,3.5.4, & 3.5.6
Fall Hazard! Do not stand on boiler.
Chemical Hazards
Chemical Hazards from Cleaning Products.
Use caution when cleaning the system. The use of
professional assistance is recommended. Use
safe procedures for the disposal of all cleaning
solutions.
Combustion Condensate –An acidic pH of approximately 3.0 to 5.0 can be expected. Use PVC,
CPVC, or other corrosion resistant piping for drainage. Collection and disposal must be in accordance
with all applicable regulations. A condensate neutralization kit is available. Please contact your local
Patterson-Kelley representative for more information.
Burn, Fire and Explosion Hazards
Burn, fire, and explosion hazards! Installation must be in strict conformance to all applicable codes
and standards including NFPA 54, ANSI Z223.1 and CAN/CSA B.149. Install all required
vent lines for gas devices. Refer to Sections 3.5 and 3.7.1.
Hazard from Incorrect Fuels! Possible fire, explosion, overheating, and damage. Do not
use any fuels except the design fuels for the unit.
Overfire Hazards! High pressure in gas supply could result in overfiring of this or other
devices supplied from the same source.
Fire and Explosion Hazards! Close the main gas shutoff before servicing boiler.
Fire and Explosion Hazards! Do not store or use gasoline or other flammable vapors or
liquids in the vicinity of this or any other gas fired appliance.
Burn hazard! Possible hot surfaces. Do not touch gas vent during firing operation. Use
only factory recommended vent components.
Burn Hazard! Pipes, vents, and boiler components could be hot.Do not touch piping or stack surfaces
during operation or immediately after shutdown of the boiler.
Burn Hazard! Hot flue! Use caution when servicing or draining boiler.
Fire and Explosion Hazards! Use caution when servicing burner. Propane (LPG) is heavier than air
and may linger in the combustion chamber, vent lines, or elsewhere.
Gas Leak Hazard! Make sure the burner is installed correctly and blower/transition is securely fastened
following any maintenance performed on them. These connections may leak gas if assembled
incorrectly.
Gas Leak Hazard! All threaded gas connections must be made using a pipe compound that is resistant
to liquefied petroleum gas. Do not use Teflon™tape on threaded gas piping.
Gas Leak Hazard! Check entire gas train for leaks after installation. If there is a smell of gas, shut down
the boiler and obtain immediate assistance from trained service personnel and/or your local fire
department.
Overfire Hazard! Possible fire and explosion from excess gas pressure. Make sure that gas inlet
pressure does not exceed 14 inches W.C.
Overfire Hazard! Possible fire and explosion. Possible malfunction of regulators and/or gas safety shut
off/control valves. Maintain all gas train components in good condition. Do not alter wiring connections.
Annual inspection by factory-trained personnel for proper set-up and operation is recommended.
Overfire and Underfire Hazards! Possible fire, explosion, overheating, and component failure. Do not
attempt to adjust firing rate of the boiler. The firing rate must be adjusted only by factory trained
personnel.

P-K MACH®Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
1004905980 P-KMACH CM300-CM500&C750-C1050
Installation and Owners Manual (Rev F Jan-2020).docx
Page v
Table of Contents
1INTRODUCTION ........................................................................................................................... 1
1.1 PURPOSE OF THIS DOCUMENT........................................................................................................ 2
1.2 COMMON ABBREVIATIONS .............................................................................................................. 2
2SITE PREPARATION.................................................................................................................... 3
2.1 INITIAL INSPECTION UPON RECEIVING.............................................................................................. 3
2.2 STORAGE PRIOR TO INSTALLATION.................................................................................................. 3
2.3 COMPLIANCE WITH CODES ............................................................................................................. 4
2.4 LOCATION SETUP...........................................................................................................................5
2.4.1 Placement.............................................................................................................................................5
2.4.2 Clearances (CM300-CM399-CM500)...................................................................................................6
2.4.3 Clearances (C750-C900-C1050)..........................................................................................................7
2.5 I NLET A IR AND E XHAUST V ENTING C ONSIDERATIONS ........................................................................ 8
2.5.1 Applicable Codes and Standards..........................................................................................................8
2.5.2 Air Inlet Planning (United States and Canada Considerations)............................................................8
2.5.3 Category II/IV Flue Gas Exhaust Vent Planning...................................................................................9
2.5.4 Venting Materials for Flue/Exhaust Systems ..................................................................................... 10
2.5.5 Required Clearances ......................................................................................................................... 11
2.6 GAS PIPING CONSIDERATIONS...................................................................................................... 13
2.7WATER QUALITY STANDARD ......................................................................................................... 13
3INSTALLATION........................................................................................................................... 13
3.1 OVERVIEW................................................................................................................................... 13
3.2 APPLIANCE CONNECTIONS ........................................................................................................... 13
3.2.1 Appliance Connections (CM300-CM399-CM500) ............................................................................. 14
3.2.2 Appliance Connections (C750-C900-C1050) .................................................................................... 15
3.3 ELECTRICAL CONNECTIONS.......................................................................................................... 16
3.3.1 Power Requirements (CM300-CM399-CM500)................................................................................. 16
3.3.2 Power Requirements (C750-C900-C1050)........................................................................................ 17
3.3.3 High Voltage (TB2) Terminal Block ................................................................................................... 18
3.3.4 Low Voltage (TB1) Terminal Block..................................................................................................... 19
3.4 COMBUSTIONAIR......................................................................................................................... 21
3.4.1 Air Inlet Requirements - United States............................................................................................... 21
3.4.2 Air Inlet Requirements - Canada ....................................................................................................... 22
3.4.3 P-K MACH®Combustion Air Requirements ...................................................................................... 23
3.4.4 Direct Vent / Sealed Combustion Installations .................................................................................. 23
3.4.5 Motorized Combustion Air Dampers.................................................................................................. 24
3.5 FLUE GAS /EXHAUST VENTING..................................................................................................... 26
3.5.1 Category II or IV Venting Installation ................................................................................................. 26
3.5.2 Vent Termination................................................................................................................................ 27
3.5.3 CM300-CM399-CM500 Through-the-Roof Venting Configurations .................................................. 28
3.5.4 CM300-CM399-CM500 Through-the-Wall Venting Configurations................................................... 29
3.5.5 C750-C900-C1050 (All Models) Through-the-Roof Venting Configurations ..................................... 30
3.5.6 C750-C900-C1050 Through-the-Wall Venting Configurations.......................................................... 31
3.5.7 C750T-C900T-C1050T Through-the-Wall Venting Configurations ................................................... 32
3.5.8 Venting for Multiple Boilers................................................................................................................. 33
3.5.9 Inlet Duct Connection to Boiler........................................................................................................... 33
3.5.10 Intake Duct Materials and Sizes.................................................................................................... 33
3.5.11 Category II Installations................................................................................................................. 34
3.5.12 Category IV Installations................................................................................................................ 34
3.5.13 Stainless Steel Venting.................................................................................................................. 35
3.5.14 CPVC Vent System Installation..................................................................................................... 35

P-K MACH®Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
1004905980 P-KMACH CM300-CM500&C750-C1050
Installation and Owners Manual (Rev F Jan-2020).docx
Page vi
3.6 REMOVING AN EXISTING BOILER ................................................................................................... 36
3.7 PIPING AND EXTERNAL CONNECTIONS........................................................................................... 37
3.7.1 Gas Piping Overview ......................................................................................................................... 37
3.7.2 Natural Gas Piping............................................................................................................................. 38
3.7.3 Propane Gas Piping........................................................................................................................... 38
3.7.4 Pressure Testing the Gas Piping....................................................................................................... 38
3.7.5 Boiler Water Piping ............................................................................................................................ 39
3.7.6 Boiler Inlet and Outlet Connections.................................................................................................... 39
3.7.7 Boiler Water Piping (for Installer)....................................................................................................... 39
3.8WATER QUALITY.......................................................................................................................... 41
3.9 PRE-START CHECKLIST................................................................................................................ 41
3.10 SAFETY CHECKS........................................................................................................................ 42
3.10.1 Ignition Safety System Test........................................................................................................... 42
3.10.2 Low Water Cut-out Test................................................................................................................. 42
3.10.3 ManualResetHigh Temperature Limit Test..................................................................................... 42
3.10.4 Gas Pressure Switch Tests........................................................................................................... 43
3.11 FUEL/AIR ADJUSTMENTS ............................................................................................................ 44
3.11.1 Gas Pressure Adjustment............................................................................................................. 44
3.11.2 Combustion Setup and Adjustment (CM300-CM399-CM500)...................................................... 45
3.11.3 Combustion Setup and Adjustment (C750-C900-C1050 All Models) ........................................... 47
3.11.4 Checking Flame Signal.................................................................................................................. 48
3.12 INITIAL NURO CONTROL SETUP &ADJUSTMENT.......................................................................... 49
3.12.1 Startup........................................................................................................................................... 49
3.12.2 Home Screen................................................................................................................................. 50
3.12.3 Information Screen ........................................................................................................................ 50
3.12.4 Setup Wizard................................................................................................................................. 51
3.13 TYPICAL BOILER OPERATING CONDITIONS................................................................................... 51
4DUAL FUEL BOILER OPERATION ............................................................................................ 52
4.1 OVERVIEW................................................................................................................................... 52
4.2 CHANGING FUEL TYPES ............................................................................................................... 52
4.3 P-K MACH C750GG, C900GG &C1050GG ............................................................................... 53
4.3.1 Natural Gas Train and Propane Gas Train Locations ....................................................................... 53
4.3.2 Fuel Selector Switch Location ........................................................................................................... 54
4.4 P-K MACH C750T, C900T &C1050T ......................................................................................... 55
4.4.1 Natural Gas Train Location................................................................................................................ 55
4.4.2 High Turndown C750T, C900T, & C1050T........................................................................................ 56
5OPERATIONS ............................................................................................................................. 57
5.1 NURO CONTROL PANEL .............................................................................................................. 57
5.1.1 Power On/Off Switch.......................................................................................................................... 57
5.1.2 NURO Touch Screen Interface and Control Panel............................................................................ 58
5.1.3 Factory Tests...................................................................................................................................... 58
5.2 NORMAL LIGHTING AND SHUT-DOWN PROCEDURES ....................................................................... 59
5.2.1 Normal Lighting Procedures .............................................................................................................. 59
5.2.2 Normal Shut Down Procedures ......................................................................................................... 59
5.3 EMERGENCY SHUT-OFF ............................................................................................................... 59
6MAINTENANCE .......................................................................................................................... 60
6.1 PREVENTATIVE MAINTENANCE...................................................................................................... 60
6.1.1 Daily Preventative Maintenance ........................................................................................................ 60
6.1.2 Weekly Preventative Maintenance..................................................................................................... 60
6.1.3 Monthly Preventative Maintenance.................................................................................................... 61
6.1.4 Semi-Annually.................................................................................................................................... 61

P-K MACH®Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
1004905980 P-KMACH CM300-CM500&C750-C1050
Installation and Owners Manual (Rev F Jan-2020).docx
Page vii
6.1.5 Annually ............................................................................................................................................. 61
6.2 CLEANING THE BURNER &COMBUSTION CHAMBER........................................................................ 62
6.2.1 MACH CM300-CM399-CM500.......................................................................................................... 62
6.2.2 MACH C750-C900-C1050................................................................................................................. 64
6.3 AFTER REPAIRS OR MAINTENANCE ............................................................................................... 65
6.4 SEQUENCE OF OPERATIONS......................................................................................................... 66
6.5 TROUBLESHOOTING ..................................................................................................................... 67
6.5.1 Loss of Power .................................................................................................................................... 67
6.5.2 Loss of Water Level ........................................................................................................................... 67
6.5.3 Low Gas Pressure ............................................................................................................................. 67
6.5.4 High Gas Pressure............................................................................................................................. 67
6.5.5 High Water Temperature.................................................................................................................... 67
6.5.6 Low Air ............................................................................................................................................... 67
6.5.7 Flame Failure..................................................................................................................................... 68
6.5.8 Flame Error........................................................................................................................................ 68
6.5.9 Flue Problem...................................................................................................................................... 68
7PARTS/TECHNICAL SUPPORT................................................................................................. 69
7.1 TERMINAL BLOCK ASSIGNMENTS .................................................................................................. 70
7.1.1 Terminal Block Assignments —High Voltage (TB2) Terminal Block................................................. 70
7.1.2 Terminal Block Assignments —Low Voltage (TB1) Terminal Block.................................................. 71
7.2WIRING DIAGRAMS....................................................................................................................... 72
7.2.1 CM300 Wiring Diagram...................................................................................................................... 72
7.2.2 CM399-CM500 Wiring Diagram......................................................................................................... 74
7.2.3 C750-C900-C1050 Single Fuel Wiring Diagram................................................................................ 76
7.2.4 C750, C900, and C1050 Dual Fuel Wiring Schematic (3 Pages)...................................................... 78
7.3 BOILER PARTS IDENTIFICATION (CM300-CM399-CM500) ............................................................. 80
7.3.1 Main Boiler Assembly (CM300-CM399-CM500) ............................................................................... 80
7.3.2 NURO Control Panel (CM300-CM399-CM500)................................................................................. 81
7.3.3 Heat Exchanger Assembly (CM300-CM399-CM500)........................................................................ 82
7.3.4 Natural or Propane Gas Train, Burner & Blower Assembly (CM300-CM399-CM500)...................... 83
7.4 BOILER PARTS IDENTIFICATION (C750-C900-C1050).................................................................... 84
7.4.1 Main Boiler Assembly (C750-C900-C1050)....................................................................................... 84
7.4.2 NURO Control Panel (C750-C900-C1050)........................................................................................ 85
7.4.3 Heat Exchanger Assembly (C750-C900-C1050)............................................................................... 86
7.4.4 Single Fuel Gas Train, Burner & Blower Assembly (C750-C900-C1050) ......................................... 87
7.4.5 Single Fuel Gas Train, Burner & Blower Assembly High Turndown (C750T-C900T-C1050T)......... 88
7.4.6 Dual Fuel Gas Train, Burner, & Blower Assembly (C750-C900-C1050)........................................... 89
8P-K MACH®SPECIFIC LIMITED WARRANTY ........................................................................... 90
9BOILER FIRE-TEST REPORT .................................................................................................... 92
APPENDIX A –MAINTENANCE LOG................................................................................................ 94
APPENDIX B –BOILER ALTITUDE DERATE SCHEDULE............................................................... 95
APPENDIX C –WATER QUALITY STANDARDS FOR HYDRONIC BOILERS IN MULTI-METAL
SYSTEMS ........................................................................................................................................... 96
APPENDIX D - BEST PRACTICES FOR NEW & RETROFIT SYSTEMS........................................... 97
APPENDIX E –INSTALLATION AND QUICK REFERENCE ............................................................. 99

P-K MACH®Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
1004905980 P-KMACH CM300-CM500&C750-C1050
Installation and Owners Manual (Rev F Jan-2020).docx
Page 1
1 Introduction
This manual describes the installation and operation of the
following P-K MACH®boilers featuring NURO®controls.
CM300, CM399, CM500, C750, C900 & C1050:
•Natural Gas, 120V (single phase), 60 Hertz
•Propane Gas, 120V (single phase), 60 Hertz
C750GG-C900GG-C1050GG:
•Dual Fuel, 120V (single phase), 60 Hertz
Individual differences between each boiler model will be called
out and defined in separate sections and the titles of these
sections will include the boiler model number. If boiler model
numbers are not listed in the section title, that section is
common to both boiler models.
If you have any questions on the information contained within,
or do not fully and completely understand the content, please
contact Patterson-Kelley Technical Service at 570.476.7261 or
toll free at 877.728.5351.
The P-K MACH®gas-fired boiler is fully modulating using a
variable speed combustion blower, sophisticated
microprocessor controls, modulating gas safety shut off /
control valves and a unique cast Aluminum heat exchanger
capable of operating in a fully condensing mode to provide
maximum efficiency in a minimum amount of space. The high-
quality materials and design of the boiler should provide years
of trouble-free service if the instructions in this manual are
followed carefully.
The boiler is only a part of the complete heating system. This
boiler may be fully operational but because of poor circulation,
improper control, or other site related characteristics, not
deliver heat to the desired location. Additional equipment such
as temperature sensors, pumps, flow switches, balancing
valves, and check valves will be required for satisfactory
operation of any system. Patterson-Kelley cannot be
responsible for the design or operation of such systems and a
qualified engineer or contractor must be consulted.
While specific details may differ slightly, basic operation is the
same for all models. Check the rating plate for correct fuel
usage and gas pressures.
If the information in this manual
is not followed, fire or explosion
may result causing property
damage, personal injury or loss
of life.
Do not store or use gasoline or other
flammable vapors or liquids in the
vicinity of this or any other
appliance. Installation and service
must be performed by a qualified
installer, service agency, or the gas
supplier.
WHAT TO DO IF YOU SMELL GAS:
•Do not try to light any
appliance.
•Do not touch any electrical
switch; do not use any phone in
your building.
•Immediately call your gas
supplier from a neighbor’s
phone. Follow the gas
supplier’s instructions.
If you cannot reach your gas
supplier, call the fire department.
It is essential to read,
understand, and follow the
recommendations of this manual
before installing, operating or
servicing this equipment. Failure
to do so could result in personal
injury or death.
Installation and service must be
performed by a qualified and
knowledgeable individual who
has been certified on the P-K
MACH®boiler. The features
which permit this boiler to
achieve high-efficiency
performance can be misused
which could result in personal
injury or death.
NOTICE! This manual covers single fuel P-K MACH®boilers
(Natural Gas –or–Propane Gas) AND dual fuel P-K MACH®
boilers (Natural Gas –and–Propane Gas).

P-K MACH®Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
1004905980 P-KMACH CM300-CM500&C750-C1050
Installation and Owners Manual (Rev F Jan-2020).docx
Page 2
1.1 Purpose of this Document
It is the purpose of this Installation and Owner’s Manual is to provide complete documentation support
for P-K MACH®boilers featuring NURO®controls. Patterson-Kelley is constantly seeking ways to
produce high quality HVAC products. Our operation is based on the premium quality control program
and insures that Patterson-Kelley manufactures quality products.
The primary concern of all Patterson-Kelley equipment installation procedures is Safety. Safety
instructions and considerations are presented and repeated throughout the document as needed. If
you have any questions on the information contained within, or do not fully and completely understand
the content, please contact Patterson-Kelley Technical Service at 570.476.7261 or toll free at
877.728.5351.
1.2 Common Abbreviations
Abbreviation
Description
AMP
Ampere or Amperage
ANSI
American National Standards Institute
ASME
American Society of Mechanical Engineers
AWG
American Wire Gauge
BTU
British Thermal Unit
CH
Comfort Heat
CO2
Carbon Dioxide
CSA
Canadian Standards Association
CSD-1
Controls and Safety Devices
CPVC
Chlorinated Polyvinyl Chloride
DHW
Domestic Hot Water
HWR
Heating Water Return / Hot Water Return (From Building)
HWS
Heating Water Supply / Hot Water Supply (To Building)
ID
Inside Diameter
MBH
Thousands of BTU / Hour
MFD
Modu-Fire Forced-Draft Series Boiler or Water Heater
MODBUS
A serial communication protocol (not an abbreviation)
NFPA
National Fire and Protection Agency
NTC
Negative Temperature Coefficient
O2
Oxygen
OD
Outside Diameter
OEM
Original Equipment Manufacturer
SCFM
Standard Cubic Feet per Minute
SMACNA
Sheet Metal and Thermoplastic Duct Construction Manual Air Conditioning Contractors
National Association
TB<#>
Terminal Block (1, 2, 3 etc.)
VAC
Volts Alternating Current
VDC
Volts Direct Current

P-K MACH®Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
1004905980 P-KMACH CM300-CM500&C750-C1050
Installation and Owners Manual (Rev F Jan-2020).docx
Page 3
2 Site Preparation
2.1 Initial Inspection upon Receiving
Upon receiving the boiler, inspect it for signs of shipping
damage. Some damage may be hidden. Unpack the boiler,
open the front and side doors and inspect the boiler. Verify that
the total number of pieces shown on the packing slip agrees
with those actually received.
2.2 Storage Prior to Installation
If the boiler is not installed immediately, it must be stored in a
location adequately protected from the weather, preferably
indoors. If this is not possible, then it should remain in the
shipping container and be covered by a tarpaulin or other
waterproof covering.
Installation and service must be
performed by a qualified
installer, service agency, or gas
supplier. Failure to install the
equipment in accordance with
this manual could result in an
unsafe operating condition.
NOTICE!
Controls and other equipment that
are damaged or fail due to
weather exposure are not covered
by warranty.
The boiler is heavy and requires
additional technicians to
support and move the unit(s)
during installation. Use
extreme caution to avoid
dropping the boiler or cause
any bodily injury while lifting or
handling. When positioning
this boiler, maintain positive
control of it at all times. Do not
attempt to move the boiler on
surfaces that are not level.
Failure to heed this warning
could result in personal injury
or death.
NOTICE!
The boiler may be installed on a
combustible floor; however, the
boiler must never be installed on
carpeting.
Bumping hazard from overhead
ducts! Install all components
with adequate vertical
clearances. Insufficient
clearance can restrict the
service access, increasing the
possibility of injury.
NOTICE! Note any damage, suspected potential damage,
or shortage of materials on the freight bill and immediately
notify the carrier. File all claims for shortage or damage with
the carrier. Claims for hidden damages must be filed with
your carrier within 7 days. The carton is equipped with a
“Tip (N) Tell”. If the “Tip (N) Tell” arrow point is blue, that
indicates the package has been on its side or tipped over in
transit.
NOTICE! Controls and other equipment that are damaged
or fail due to weather exposure are not covered by warranty.

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2.3 Compliance with Codes
Each P-K MACH®boiler with standard components complies with American National Standard/CSA
Standard ANSI Z21.13/CSA 4.9, latest edition for Gas-Fired Low Pressure Steam and Hot Water
Boilers.
The P-K MACH CM300-CM399-CM500 and C750-C900-C1050 heat exchangers are constructed and
stamped in accordance with ASME Boiler and Pressure Vessel Code, Section IV.
CM300, CM399, CM500, C750, C900 & C1050
Code of Construction
ASME Section IV –“H” (Latest Edition)
Maximum Allowable Working
Pressure
80 PSIG
Maximum Allowable Design
Temperature
200°F
Hi-Limit Setpoint
197°F
Maximum Setpoint
185°F
Installation of the boiler must conform to all the requirements of all national, state and local codes
established by the authorities having jurisdiction or, in the absence of such requirements, to the
National Fuel Gas Code, ANSI Z223.1/NFPA 54 latest edition in the U.S. In Canada, the equipment
shall be installed in accordance with the current Installation Code for Gas Burning Appliances and
Equipment, CAN/CSA-B.149, latest edition, and applicable Provincial Regulations for the class, which
should be carefully followed in all cases. Authorities having jurisdiction should be consulted before
making any installation.
Where required by local codes, the installation must conform to American Society of Mechanical
Engineers Safety Code for Controls and Safety Devices for Automatically Fired Boilers (ASME CSD-1).
In the Commonwealth of Massachusetts (a) this unit must be installed by a licensed pipe fitter/plumber,
(b) field installed gas cocks must be “T” handle type, (c) piping of condensate shall conform to the State
Plumbing Code, and (d) refer to the Massachusetts Supplement for further details

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2.4 Location Setup
2.4.1 Placement
The boiler must be level to function properly. To assist in leveling the boiler, the four (4) adjustable
leveling legs (1/2"- 13 NC) must be installed and adjusted accordingly. The adjustable legs also
provide adequate floor clearance and prevent distortion/twisting of the cabinet enclosure.
1. Ensure the base is securely connected to the boiler.
2. The boiler may be installed on a combustible floor (except carpeting) or a non-combustible
surface such as a concrete housekeeping pad.
3. Once the boiler is situated, use a bubble level and adjust the four 1/2”-13 leg bolts until the
boiler is level.
NOTE
Never install boiler on carpeting.
The boiler must be level within 0.25° in order to function properly. Failure to heed this
warning could result in personal injury or death.

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2.4.2 Clearances (CM300-CM399-CM500)
If the boiler is to be installed near combustible surfaces, there must be six (6”) inches minimum
clearance. Failure to provide adequate service clearances, even with non-combustible surfaces, may
present problems during routine maintenance of the boiler. The boiler must be installed in a space
large in comparison to the boiler as described in the National Fuel Gas Code, NFPA 54/ANSI Z223.1,
Latest Edition.
Type of Surface
Dimensions (inches)
A
B
C†
D
E**
CSA Minimum Clearances to
Combustibles*
6
6
6
6
6
Clearance to Non-Combustible Surfaces
0
0
0
0
0
Recommended Service Clearances
36
0
24
2
24
† “C" dimension includes clearance to remove the burner. Do not put pipes, ducts, etc. in area above the
boiler.
*CSA minimum. Actual clearance depends upon venting requirements.
** Right-Side service access (“E” Dimension”) is needed to view the boiler’s runout/safety labels, as well
as viewing the combustion flame.

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2.4.3 Clearances (C750-C900-C1050)
If the boiler is to be installed near combustible surfaces, there must be twenty-four (24”) inches
minimum clearance. Failure to provide adequate service clearances, even with non-combustible
surfaces, may present problems during routine maintenance of the boiler. The boiler must be installed
in a space large in comparison to the boiler as described in the National Fuel Gas Code, NFPA
54/ANSI Z223.1, Latest Edition.
Type of Surface
Dimensions (inches)
A
B
C†
D
CSA Minimum Clearances to
Combustibles
24
24*
24
24
Clearance to Non-Combustible Surfaces
0
0
0
0
Recommended Service Clearances
30
24*
24
24**
† “C" dimension includes clearance to remove the burner. Do not put pipes, ducts, etc. in area above the
boiler.
* CSA minimum. Actual clearance depends upon venting requirements.
**The critical service access for the MACH C750-C900-C1050 is on the left side (when viewed from the
front). Patterson-Kelley recommends equal clearance between each boiler when there is insufficient
access at the rear to allow for service and adjustment.

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2.5 Inlet Air and Exhaust Venting Considerations
2.5.1 Applicable Codes and Standards
United States:
Canada:
Standards:
These codes and standards contain information for the venting of gas
fired appliances, including, but not limited to vent sizing, location,
clearance to combustibles, and safe installation practices. The
installation must comply with both the above Federal Codes and with
state, provincial and local codes.
2.5.2 Air Inlet Planning (United States and Canada
Considerations)
•Air inlet considerations for the United States are established by
NFPA 54/ANSI Z223.1 & NFPA/ANSI 211.
•Air inlet requirements for Canada are established by CAN/CSA
B149.1.
Refer to Section 3.4.1 for more details on combustion air inlet
requirements in the United States and Section 3.4.2 for Canada.
Design and installation of
venting systems should be
done only by qualified and
knowledgeable venting systems
personnel and in accordance
with vent system
manufacturer’s installation
instructions. Installing a boiler
or vent system using improper
installation methods or
materials can result in serious
injury or death due to fire or
asphyxiation.
Before connecting a boiler to a
venting system, it must be
determined whether the boiler
is to be installed in a
conventional or direct vent
configuration. In the US,
provisions for combustion air
must be in accordance with
NFPA 54/ANSI Z223.1, National
Fuel Gas Code, latest edition, or
applicable provisions of local
building codes. In Canada,
combustion and ventilation air
openings shall comply with
CAN/CSA B-149.1 Natural Gas
and Propane Installation Code.
For correct installation of a vent
system, read all of these
instructions and refer to the
vent manufacturer’s
instructions.
Failure to use a proper vent
system (types and materials), as
described in this manual will
void the boiler warranty and
may result in rapid deterioration
of the venting system, creating
a health or life safety hazard.
Faulty vent installation can
allow toxic fumes to be released
into living areas. This may
cause property damage, injury,
or death.
NBIC –Part I
National Board Inspection Code -
Installation
NFPA 54/ANSI Z223.1
National Fuel Gas Code
NFPA/ANSI 211
Chimneys, Fireplaces, Vents and
Solid Fuel Burning Appliances
CAN/CSA B149.1
Installation Codes for Gas Burning Equipment
UL 441 / ULC S605
Standard for Gas Vents
UL 1738
Venting Systems for Gas-Burning Appliances,
Categories II, III and IV
ULC S636-95
Standard for Type BH Venting System
Sheet Metal and Thermoplastic Duct Construction
Manual Air Conditioning Contractors National
Association (SMACNA)

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2.5.3 Category II/IV Flue Gas Exhaust Vent Planning
Several codes and standards have categorized appliances in accordance with the flue gas temperature
and pressure produced by the appliance. The applicable categories are defined as follows:
•Category II: An appliance that operates with a non-positive vent static pressure and with a vent
temperature that may cause excessive condensate production in the vent.
•Category IV: An appliance that operates with a positive vent static pressure and with a vent
temperature that may cause excessive condensate production in the vent.
•Direct Vent: An appliance that is constructed and installed so that all air for combustion is
derived directly from outdoors and all flue gases are discharged to the outdoors.
All P-K MACH®boilers are dual-certified as Category II or IV appliances, as defined in ANSI
Z21.13/CSA 4.9, latest edition. The P-K MACH®series boilers are capable of operating with slightly
negative to slightly positive exhaust pressure. It is critical to ensure the flue vent material is certified for
Category II or IV operation.
NOTE: For Category II installations, ensure the flue venting system is designed to maintain a
slightly negative exhaust pressure between -0.01” W.C. and -0.05” W.C.
NOTE: For Category IV installations, ensure the flue venting system is designed to maintain a
slightly positive exhaust pressure which MUST BE in the following ranges:
•+0.01” W.C. and +0.22” W.C. (Direct Vent / Sealed Combustion)
•+0.01” W.C. and +0.4” W.C. (Exhaust Only)
The vent material to be used for US and Canada is listed in the Table of Acceptable Materials for
Venting Systems located in Section 2.5.4.
Vent installations shall be in accordance with NFPA 54/ANSI Z223.1, the National Fuel Gas Code, or
CAN/CSA-B149.1, the Natural Gas and Propane Installation Code, or applicable provisions of the local
building codes.
Vent Sizing for Category II / IV Operation
The vent must be sized in accordance with theASHRAE Systems and Equipment handbook (Chapter
30) or according to the vent manufacturer’s recommendations. When using manufactured venting
systems, consult your vent supplier for correct sizing and structural support requirements.
P-K MACH®Boiler Model
Draft
Stack Temperature
CO2
Natural Gas
CO2
Propane Gas
CM300, CM399, CM500,
C750, C900, C1050
Category II
-0.01” to -0.05” W.C.
210 °F (gross)
9.0%
10.4%
CM300, CM399, CM500,
C750, C900, C1050
Category IV
(Sealed Combustion)
+0.01” to +0.22” W.C.
210 °F (gross)
9.0%
10.4%
CM300, CM399, CM500,
C750, C900, C1050
Category IV
(Exhaust Only)
+0.01” to +0.4” W.C.
210 °F (gross)
9.0%
10.4%

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2.5.4 Venting Materials for Flue/Exhaust Systems
The P-K MACH®boilers are dual certified as a Category II or
Category IV appliances, which vents with a temperature that is likely to
cause condensation in thevent. Therefore, any venting system used
with the P-K MACH®boiler must comply with the requirementsfor
either CategoryII or Category IV venting systems as specified in the
latest editionof NFPA54/ANSI Z223.1 in the US or the latest edition of
CAN/CSAB-149.1 in Canada.
CPVC Venting
US: CPVC pipe conforming to ASTM F441. Sch. 80 fittings
conforming to ASTM F439. Joints are to be sealed with
solvent conforming ASTM 493.
Canada: CPVC Pipe, Fitting and Sealant listed and
labeled to ULC S-636 Standard for Type BH Venting
Systems.
Polypropylene Venting
US and Canada: Polypropylene such as InnoFlue®from
Centrotherm or PolyPro®from DuraVent™or other listed
manufacturers. When used, the same manufacturer's
material must be used throughout the system. It is not
permissible to use material from different manufacturers
within the same system.
As per ANSI Z21.13b-2012 * CSA 4.9b-2012:
•The use of cellular core PVC, CPVC and Radel® as venting materials is
prohibited.
•The use of external insulation on plastic vent pipe is prohibited.
Acceptable Venting Materials
Model
Country
AL29-4C
316L SS
PVC
CPVC
POLYPROPYLENE
CM300
US
Yes
Yes
No
Yes*
Note 2
CM399
US
Yes
Yes
No
Yes*
Note 2
CM500
US
Yes
Yes
No
Yes*
Note 2
C750
US
Yes
Yes
No
Yes*
Note 2
C900
US
Yes
Yes
No
Yes*
Note 2
C1050
US
Yes
Yes
No
Yes*
Note 2
CM300
Canada
Yes
Yes
No
Note 1*
Note 1
CM399
Canada
Yes
Yes
No
Note 1*
Note 1
CM500
Canada
Yes
Yes
No
Note 1*
Note 1
C750
Canada
Yes
Yes
No
Note 1*
Note 1
C900
Canada
Yes
Yes
No
Note 1*
Note 1
C1050
Canada
Yes
Yes
No
Note 1*
Note 1
NOTE 1: When this material is used for venting, it must be listed to ULC-S636.
NOTE 2: When this material is used for venting, it must be listed to either UL-
1738 or ULC-S636 (depending on the local requirements). Consult the local
boiler codes for more information.
The venting materials listed are
intended for the venting of gas
burning appliances only. Do
not use these venting materials
for venting liquid or solid fuel
(such as oil, kerosene, wood or
coal) appliances.
Maintain clearances to
combustibles as listed in the
vent manufacturer’s installation
instructions or as set forth in
the codes and standards listed
in this section.
Do not use these vent pipes for
incinerators of any sort!
This boiler is not certified for
use with PVC venting. Use of
PVC venting may result in vent
failure and possible serious
injury or death.
* CPVC must be Schedule 80

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2.5.5 Required Clearances
Conventional Vent Systems Clearances
The following termination clearance requirements are for conventional non direct vent installations:
•The vent system shall terminate at least 3 ft. above a forced air inlet located within 10 ft.
horizontally.
•The vent system shall terminate at least 4 ft. below, 4 ft. horizontally from or 1 ft. above any
door, operable window or gravity inlet into any building. The bottom of the vent terminal shall be
at least 12 in. above grade or highest expected snow line (if applicable).
•Through the wall terminations shall not terminate over public walkways or over an area where
condensate or vapor could create a nuisance or hazard or could be detrimental to the operation
of regulators, relief valves, or other equipment.
Direct Vent (Sealed Combustion) Systems Clearances
•The vent terminal shall be located at least 12 in. from any air opening into a building. The
bottom of the vent terminal shall be at least 12 in. above grade. Both the vent and air intake
terminals must be at least 12 in. above the highest expected snow line.
•Through the wall terminations shall not terminate over public walkways or over an area where
condensate or vapor could create a nuisance or hazard or could be detrimental to the operation
of regulators, relief valves or other equipment.
•When multiple direct vent appliances are adjacent, the exhaust must terminate at least 10 ft.
horizontally or 3 ft. vertically from the air intake of another appliance.
The boiler vent should not be
connected into any portion of
another mechanical draft system
without consulting the vent
manufacturer. The boiler shall
not be connected to any part of
a vent system serving a
Category I appliance, nor shall a
Category I appliance be
connected to any part of the
vent system serving this
appliance. For Category II
common venting, refer to local
venting codes. Improper
interconnection of venting
systems may result in leakage of
flue gases into occupied spaces.

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Mark
Description
US Installations
Canadian Installations
A
Clearance to each side of center line
extended above meter/regulator
3 ft. (91 cm) within a height of 15 ft. (4.6
m) above the meter/regulator assembly
B
Clearance to service regulator vent outlet
3 ft. (91 cm)
C
Clearance above grade, porch, deck,
veranda, or balcony
12 in
D
Clearance to window or door that may be
opened
4 ft. (1.2 m) below or to side
of opening
1 ft. (300 mm) above
opening
6 in (15 cm) for appliances ≤ 10,000
Btuh (3 kW)
12 in (30 cm) for appliances > 10,000
Btuh (3 kW) and ≤ 100,000 Btuh (30
kW)
36 in (91 cm) for appliances > 100,000
Btuh (30 kW)
E
Clearance to non-mechanical air supply inlet
to building or the combustion air inlet to any
other appliance
4 ft. (1.2 m) below or to side
of opening
1 ft. (300 mm) above
opening
6 in (15 cm) for appliances ≤ 10,000
Btuh (3 kW)
12 in (30 cm) for appliances > 10,000
Btuh (3 kW) and ≤ 100,000 Btuh (30
kW)
36 in (91 cm) for appliances > 100,000
Btuh (30 kW)
F
Clearance to a mechanical air supply inlet
3 ft. (91 cm) above if within
10 ft. (3 m) horizontally
6 feet (1.83 m)
For clearances not specified maintain clearance in accordance with local installation codes and the requirements of the gas supplier
Interior Component Clearances
All vent system components shall be installed so as to maintain the following minimum clearances:
Material
Combustible
Non-Combustibles
Unlisted single wall metal pipe
Do NOT Use
Do NOT Use
Single wall PVC pipe
Do NOT Use
Do NOT Use
UL 1738 listed Category IV vent
Per manufacturer’s listing
Per manufacturer’s listing
Flue Connection
The connection from the boiler to the vent should be as direct as possible and the upward slope of any
horizontal breaching should be at least 1/4 inch per linear foot. The complete exhaust with drain
system is in Section 3.5. The appliance connector should incorporate provisions to drain condensate
formed in the vent system. The connector should include an appropriate drain section (not provided).