PB Heat Boiler MI User Manual

Series MI/MIH  
Gas Boilers  
Installation,  
Operation &  
Maintenance  
Manual  
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USING THIS MANUAL  
USING THIS MANUAL  
A. INSTALLATION SEQUENCE  
DANGER  
Indicates a condition or hazard which will cause  
severe personal injury, death or major property  
damage.  
Follow the installation instructions provided in this  
manual in the order shown. The order of these  
instructions has been set in order to provide the installer  
with a logical sequence of steps that will minimize  
potential interferences and maximize safety during  
boiler installation.  
WARNING  
B. SPECIAL ATTENTION BOXES  
Indicates a condition or hazard which may cause  
severe personal injury, death or major property  
damage.  
Throughout this manual you will see special attention  
boxes intended to supplement the instructions and make  
special notice of potential hazards. These categories  
mean, in the judgment of PB Heat, LLC.:  
CAUTION  
Indicates a condition or hazard which will or can  
cause minor personal injury or property damage.  
NOTICE  
Indicates special attention is needed, but not directly  
related to potential personal injury or property  
damage.  
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PREINSTALLATION  
1. PREINSTALLATION  
Read carefully, study these instructions before beginning work.  
This boiler must be installed by a qualified contractor.  
The boiler warranty can be voided if the boiler is not installed, maintained and serviced correctly.  
NOTICE  
The equipment must be installed in accordance with those installation requirements of the authority having  
jurisdiction or, in the absence of such requirements, to the current edition of the National Fuel Gas Code, ANSI  
Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas and Propane Installation Code.  
Where required by the authority having jurisdiction, the installation must conform to American Society of  
Mechanical Engineers Safety Code for Controls and Safety Devices for Automatically Fired Boilers, ASME CSD-1.  
A. ACCESSIBILITY CLEARANCES  
C. AIR FOR COMBUSTION AND  
VENTILATION  
Install boiler not less than 24(610 mm) between the  
left side, top, and front of the boiler and adjacent wall or  
other appliance, when access is required for servicing.  
1. Adequate combustion air and ventilation air must be  
provided for this appliance in accordance with the  
section of the National Fuel Gas Code entitled, Air  
for Combustion and Ventilation” or applicable  
provisions of the local building code. Subsections 2  
through 8 as follows are based on the National Fuel  
Gas Code requirements.  
B. CLEARANCE FROM COMBUSTIBLE  
CONSTRUCTION  
The design of this boiler is certified for alcove installation  
with the following clearances:  
2. Required Combustion Air Volume: The total required  
volume of indoor air is to be the sum of the required  
volumes for all appliances located within the space.  
Rooms communicating directly with the space in  
which the appliances are installed and through  
combustion air openings sized as indicated in  
Subsection 3 are considered part of the required  
volume. The required volume of indoor air is to be  
determined by one of two methods.  
1. 6(152 mm) between sides and combustible  
construction.  
2. 24(610 mm) between top of jacket and  
combustible construction.  
3. 6(152 mm) between draft hood and combustible  
construction.  
4. 6(152 mm) between vent pipe and combustible  
construction.  
5. 10(254 mm) between rear of jacket and  
a. Standard Method: The minimum required  
volume of indoor air (room volume) shall be 50  
cubic feet per 1000 BTU/Hr (4.8 m3/kW). This  
method is to be used if the air infiltration rate is  
unknown or if the rate of air infiltration is known  
to be greater than 0.6 air changes per hour. As  
an option, this method may be used if the air  
infiltration rate is known to be between 0.6 and  
0.4 air changes per hour. If the air infiltration rate  
is known to be below 0.4 then the Known Air  
Infiltration Rate Method must be used. If the  
building in which this appliance is to be installed  
is unusually tight, PB Heat recommends that the  
air infiltration rate be determined.  
combustible construction.  
WARNING  
Do not install this boiler on combustible flooring  
unless it is installed on a special combustible floor  
pan provided by PB Heat, LLC. Boiler installation on  
combustible flooring without the special pan is a fire  
hazard.  
To order combustible floor pan, use the 5-digit stock  
codes listed in Section 11A of this manual.  
b. Known Air Infiltration Rate Method: Where  
the air infiltration rate of a structure is known,  
the minimum required volume of indoor air for  
appliances other than fan assisted and for the  
Series MI Boiler shall be determined as follows:  
WARNING  
Do not install this boiler on carpeting. Boiler  
installation on carpeting is a fire hazard. Install this  
boiler on non-combustible flooring or use a  
combustible floor pan to install this boiler on other  
non-carpeted flooring.  
21 ft3  
ACH  
I other  
1000Btu  
Required Volumeother  
=
/
hr  
2
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PREINSTALLATION  
where:  
Iother = Input of appliances other than fan  
assisted in Btu/hr  
ACH = air change per hour (percent of the  
volume of the space exchanged per  
hour, expressed as a decimal)  
For fan assisted appliances, calculate the required  
volume of air using the following equation:  
15 ft3  
ACH  
I fan  
1000Btu  
Required Volumefan  
=
/
hr  
Ifan = Input of the fan assisted appliances in  
Btu/hr  
Note: These calculations are not to be used for  
infiltration rates greater than 0.60 ACH.  
Figure 1.2: Air Openings – All Air from Indoors  
on Different Floors  
3. Indoor Air Opening Size and Location: Openings  
connecting indoor spaces shall be sized and located  
as follows:  
4. Outdoor Combustion Air: Outdoor combustion air is  
to be provided through one or two permanent  
openings. The minimum dimension of these air  
openings is 3 inches (76 mm).  
a. Combining spaces on the same floor:  
Provide two permanent openings communicating  
with additional spaces that have a minimum free  
area of 1 in2 per 1000 Btu/hr (22 cm2 per 1000 W)  
of the total input rating of all gas fired equipment  
but not less than 100 in2 (645 cm2). One  
a. Two Permanent Opening Method: Provide  
two permanent openings. One opening is to  
begin within 12 inches (305 mm) of the top of  
the space and the other is to begin within 12  
inches (305 mm) of the floor. The openings are  
to communicate directly or by ducts with the  
outdoors or with spaces that freely communicate  
with the outdoors. The size of the openings shall  
be determined as follows:  
opening is to begin within 12 inches (305 mm)  
from the top of the space and the other is to  
begin within 12 inches (305 mm) from the floor.  
The minimum dimension of either of these  
openings shall be 3 inches (76 mm). See Figure  
1.1 for an illustration of this arrangement.  
i. Where communicating directly or through  
vertical ducts with the outdoors each opening  
shall have a minimum free area of 1 in2 per  
4000 Btu/hr (22 cm2 per 4000 W) of total  
input rating for all equipment in the space.  
See Figure 1.3 for openings directly  
communicating with the outdoors or Figure  
1.4 for openings connected by ducts to the  
outdoors.  
Figure 1.1: Air Openings – All Air from Indoors  
on the Same Floor  
b. Combining spaces on different floors:  
Provide one or more permanent openings  
communicating with additional spaces that have  
a total minimum free area of 2 in2 per 1000  
Btu/hr (44 cm2 per 1000 W) of total input rating  
of all equipment. See Figure 1.2 for an  
illustration of this arrangement.  
Figure 1.3: Air Openings – All Air Directly from  
Outdoors  
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PREINSTALLATION  
Figure 1.4: Air Openings – All Air from Outdoors  
through Vertical Ducts  
Figure 1.6: Air Openings – All Air from Outdoors  
through One Opening  
ii. Where communicating with the outdoors  
through horizontal ducts, each opening shall  
have a minimum free area of 1 in2 per 2000  
Btu/hr (22 cm2 per 2000 W) of total rated  
input for all appliances in the space. See  
Figure 1.5.  
5. Combination Indoor and Outdoor Combustion Air:  
If the required volume of indoor air exceeds the  
available indoor air volume, outdoor air openings or  
ducts may be used to supplement the available  
indoor air provided:  
a. The size and location of the indoor openings  
comply with Subsection 3.  
b. The outdoor openings are to be located in  
accordance with Subsection 4.  
c. The size of the outdoor openings are to be sized  
as follows:  
Vavail  
Vreq  
Areq = Afull  
x
1 –  
where:  
Areq = minimum area of outdoor openings.  
Afull = full size of outdoor openings calculated  
in accordance with Subsection 4.  
Vavail = available indoor air volume  
Vreq = required indoor air volume  
Figure 1.5: Air Openings – All Air from Outdoors  
through Horizontal Ducts  
6. Engineered Installations: Engineered combustion air  
installations shall provide an adequate supply of  
combustion, ventilation, and dilution air and shall be  
approved by the authority having jurisdiction.  
b. One Permanent Opening Method: Provide  
one permanent opening beginning within 12  
inches (305 mm) of the top of the space. The  
opening shall communicate directly with the  
outdoors, communicate through a vertical or  
horizontal duct, or communicate with a space  
that freely communicates with the outdoors. The  
opening shall have a minimum free area of 1 in2  
per 3000 Btu/hr of total rated input for all  
appliances in the space and not less than the  
sum of the cross-sectional areas of all vent  
connectors in the space. The gas-fired equipment  
shall have clearances of at least 1 inch (25 mm)  
from the sides and back and 6 inches (150 mm)  
from the front of the appliance. See Figure 1.6  
for this arrangement.  
7. Mechanical Combustion Air Supply:  
a. In installations where all combustion air is  
provided by a mechanical air supply system, the  
combustion air shall be supplied from the  
outdoors at the minimum rate of 0.35 ft3/min per  
1000 Btu/hr (0.034 m3/min per 1000 W) of the  
total rated input of all appliances in the space.  
b. In installations where exhaust fans are installed,  
additional air shall be provided to replace the  
exhaust air.  
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PREINSTALLATION  
c. Each of the appliances served shall be  
interlocked to the mechanical air supply to  
prevent main burner operation when the  
mechanical air supply system is not in operation.  
e. Ducts shall not be screened where terminating in  
an attic space.  
f. Horizontal upper combustion air ducts shall not  
slope downward toward the source of the  
combustion air.  
d. In buildings where the combustion air is provided  
by the mechanical ventilation system, the system  
shall provide the specified combustion air rate in  
addition to the required ventilation air.  
g. The remaining space surrounding a chimney  
liner, gas vent, special gas vent, or plastic piping  
installed within a masonry, metal, or factory built  
chimney shall not be used to supply combustion  
air.  
8. Louvers & Grills:  
a. The required size of openings for combustion,  
ventilation, and dilution air shall be based on the  
net free area of each opening.  
h. Combustion air intake openings located on the  
exterior of buildings shall have the lowest side of  
the combustion air intake opening at least 12  
inches (305 mm) above grade.  
i. Where the free area through a louver or grille  
is known, it shall be used in calculating the  
opening size required to provide the free area  
specified.  
WARNING  
Liquefied Petroleum (LP) is heavier than air and may  
collect or “pool” in a low area in the event of a leak  
from defective equipment. This gas may then ignite,  
resulting in a fire or explosion.  
ii. Where the free area through a louver or grille  
is not known, it shall be assumed that wooden  
louvers will have 25% free area and metal  
louvers and grilles will have 75% free area.  
D. INSTALLATION SURVEY  
iii. Nonmotorized dampers shall be fixed in the  
open position.  
For new and existing installations, a Water Installation  
Survey is available from PB Heat, LLC. The survey will  
provide information on how a hot water boiler works  
with your specific system and will provide an overview  
of hot water system operation in general.  
b. Motorized dampers shall be interlocked with the  
equipment so that they are proven in the full  
open position prior to ignition and during  
operation of the main burner.  
You can also use this survey to locate system problems  
which will have to be corrected. To obtain copies of the  
Water Installation Survey, contact your PB Heat  
i. The interlock shall prevent the main burner  
from igniting if the damper fails to open  
during burner startup.  
representative or download it from PeerlessBoilers.com.  
E. PLANNING THE LAYOUT  
ii. The interlock shall shut down the burner if  
the damper closes during burner operation.  
Prepare sketches and notes of the layout to minimize the  
possibility of interferences with new or existing  
equipment, piping, venting and wiring.  
9. Combustion Air Ducts  
a. Ducts shall be constructed of galvanized steel or  
an equivalent corrosion- resistant material.  
b. Ducts shall terminate in an unobstructed space,  
allowing free movement of combustion air to the  
appliances.  
c. Ducts shall serve a single space.  
d. Ducts shall not serve both upper and lower  
combustion air openings where both such  
openings are used. The separation between ducts  
serving upper and lower combustion air  
openings shall be maintained to the source of  
combustion air.  
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BOILER SET-UP  
2. BOILER SET-UP  
1. Provide a sound, level foundation. Locate boiler as  
near to the chimney or outside wall as possible and  
centralized with respect to the heating system.  
4. Separate the wood shipping pallet from the boiler  
base by removing two (2) hold-down bolts at each  
end of the boiler base.  
2. Locate boiler in front of installation position before  
removing crate.  
5. Move boiler into final position. If using combustible  
floor pan, install boiler on pan as outlined in the  
instructions included with the pan.  
3. If using combustible floor pan, position pan on  
foundation or flooring.  
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WATER PIPING AND CONTROLS  
3. WATER PIPING AND CONTROLS  
3. Supply Piping:  
A. BOILER SUPPLY AND RETURN  
Pipe the supply to the 1-1/2 NPT supply tapping at  
the top and rear of the boiler.  
1. Size the supply and return to suit the system. A  
typical piping arrangement is shown in Figure 3.1.  
Refer also to the I=B=R Guide - Residential  
Hydronic Heating Installation/Design and the PB  
Heat Water Survey for additional guidance during  
water piping installation.  
4. When system return water temperature will be below  
130°F (54°C), pipe the boiler with a bypass  
arrangement to blend the system return and hot  
supply to obtain at least 130°F (54°C) entering the  
boiler. For more information on bypass piping,  
consult the PB Heat Water Survey.  
2. Return Piping:  
Pipe the drain valve to a tee, provided, and the  
1-1/4 NPT return tapping near the bottom of the left  
section. Pipe the return to the tee. Pipe the drain  
valve nipples and tee to the 1-1/4 NPT return  
tapping as shown in Figure 3.1.  
Figure 3.1: Supply and Return Piping  
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WATER PIPING AND CONTROLS  
6. Install this boiler so that the gas ignition system  
components are protected from water (dripping,  
spraying, etc.) during appliance operation and  
service (circulator replacement, condensate trap,  
control replacements, etc.).  
7. If this boiler and distribution system is used in  
conjunction with a refrigeration system, pipe the  
chilled medium in parallel with the boiler and install  
the proper valve to prevent the chilled medium from  
entering the boiler. A drawing illustrating this hook-  
up is provided in Figure 3.2.  
8. When the boiler is connected to heating coils  
located in air handling units where they may be  
exposed to refrigerated air circulation, install flow  
control valves or other automatic means to prevent  
gravity circulation of the boiler water during the  
cooling cycle.  
9. If this boiler is installed above radiation level,  
provide a low water cutoff device, either as a part of  
the boiler or at the time of boiler installation.  
Figure 3.2: Parallel Hook-Up with Water Chiller  
B. SAFETY RELIEF VALVE  
1. Locate safety relief valve and fittings in bag  
assembly.  
2. If air elimination is not required at the safety relief  
valve tapping, install valve and piping as shown in  
Figure 3.3.  
3. For air elimination at the safety relief valve tapping,  
install valve and piping as shown in Figure 3.4.  
CAUTION  
Pipe the discharge of safety relief valve to prevent  
injury in the event of pressure relief. Pipe the  
discharge to a drain. Provide piping that is the same  
size as the safety relief valve outlet.  
Figure 3.3: Safety Relief Valve Hook-Up  
Installation with Air Elimination in  
System Piping  
Figure 3.4: Safety Relief Valve Hook-Up with  
Air Elimination  
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WATER PIPING AND CONTROLS  
C. PIPING FOR ZONED SYSTEMS  
1. See Figures 3.5 and 3.6 for basic zoned system  
layouts.  
2. Run each zone pipe down then up to zone to  
prevent air accumulation in piping.  
3. If required, provide means to isolate and drain each  
zone separately.  
Figure 3.5: Zone Piping with Zone Valves  
Figure 3.6: Zone Piping with Circulators  
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WATER PIPING AND CONTROLS  
D. EXPANSION TANK  
F. FREEZE PROTECTION  
For new or existing systems that must be freeze-  
protected:  
1. Consult the tank manufacturer’s instructions for  
specific information relating to tank installation. Size  
the expansion tank for the required system volume  
and capacity. See Table 10.2 in Section 10 for boiler  
water content.  
WARNING  
Use only inhibited propylene glycol solutions of up to  
50% by volume with water. Ethylene glycol is toxic  
and can attack gaskets and seals used in hydronic  
systems.  
2. Expansion tanks are available with built-in fill valves  
and check valves for reducing supply water pressure  
and maintaining minimum system pressure. Check  
the design features of the tank and provide valves as  
necessary. Refer back to Figure 3.1 for typical  
expansion tank piping.  
1. Glycol in hydronic applications is specially  
formulated for this purpose. It includes inhibitors  
which prevent the glycol from attacking metallic  
system components. Make certain that the system  
fluid is checked for the correct glycol concentration  
and inhibitor level.  
E. INDIRECT-FIRED WATER HEATER  
If the boiler is to be used in conjunction with an indirect-  
fired water heater, refer to Figure 3.7 for typical piping.  
Follow the instructions provided by the water heater  
manufacturer. Pipe the water heater as a separate zone.  
2. The glycol solution should be tested at least once a  
year and as recommended by the glycol  
manufacturer.  
3. Glycol solutions expand more than water. For  
example, a 50% by volume solution expands 4.8%  
in volume for a temperature increase from 32°F  
(0°C) to 180°F (82°C), while water expands 3% with  
the same temperature rise. Allowance must be made  
for this expansion in system design.  
4. For more information, consult the PB Heat Water  
Installation Survey and the glycol manufacturer.  
Figure 3.7: Typical Piping with Indirect-Fired Water Heater  
10  
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VENTING  
4. VENTING  
A. INTEGRAL DRAFT HOOD  
B. VENT DAMPER INSTALLATION –  
GENERAL  
1. The MI/MIH boiler is equipped with a built-in draft  
hood. This device is designed to:  
1. Do not use one vent damper to control two or more  
heating appliances. See Figure 4.1.  
a. provide for the ready escape of flue gases from  
the boiler in the event of no draft.  
2. Follow these and the installation instructions that are  
included with the vent damper. Observe the cautions  
and warnings that accompany all instructions.  
b. prevent a backdraft from entering the boiler.  
c. control stack draft during operation.  
3. Make certain that minimum clearances provided in  
the vent damper manufacturer’s instructions are  
maintained and that adequate space is available for  
damper access and service.  
These tasks are accomplished without the extra  
height requirements of a separate draft hood.  
2. The draft hood relief opening is the large rectangular  
passage at the front of the boiler. Make certain that  
there are no obstructions to airflow in front of this  
opening.  
4. Orient the damper operator to facilitate connection  
of the harness with the vent damper and boiler. Note  
flue gas flow arrow on vent damper and orient as  
required. For installation with damper mounted in  
vertical position, see Figure 4.2. For installation with  
damper mounted in horizontal position, mount the  
unit as shown in Figure 4.3 to avoid excessive heat  
on the operator or condensation drips into the  
operator.  
3. A vent safety shut-off switch is located within the  
draft relief opening to shut off the boiler in case of a  
blocked vent condition. See Section 7B for details  
regarding this device. See Figure 6.1 in Section 6  
(Electrical) for spill switch location.  
4. The vent damper can be mounted directly onto the  
round draft hood outlet (vent connector) on top of  
the boiler, or in vent piping close to the boiler. See  
the Vent Damper Installation Instructions below.  
Figure 4.1: Venting Multiple Appliances  
11  
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VENTING  
4. Before connection of joints, inspect the vent pipe  
interior for foreign objects such as tools, equipment,  
rags, etc. and remove if present.  
C. VENT PIPING AND CHIMNEY  
1. Install vent piping in accordance with Venting of  
Equipment part of the National Fuel Gas Code, ANSI  
Z223.1/NFPA 54, sections 7.2, 7.3 or 7.4 of  
CAN/CSA B149.1, Natural Gas and Propane  
Installation Code, or applicable provisions of the  
local building codes.  
5. Insert vent pipe into but not beyond the inside wall  
of the chimney flue.  
6. Do not connect vent connectors serving appliances  
vented by natural draft into any portion of  
mechanical draft systems operating under positive  
pressure.  
2. Inspect the existing chimney and lining for structural  
soundness, corrosion and perforations. Repair as  
necessary.  
7. Support horizontal portions of the venting system to  
prevent sagging by use of metal strapping or  
equivalent means. Locate supports at no more than  
4 foot (1.2 meter) intervals.  
3. Install vent pipe to slope upward at least 1/4” per  
lineal foot (21 mm per meter) between the draft  
hood outlet and the chimney.  
Figure 4.2: Venting with Vent Damper in Vertical Position  
Figure 4.3: Venting with Vent Damper in Horizontal Position  
12  
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VENTING  
d. Place in operation the appliance being inspected.  
D. BOILER REMOVAL FROM COMMON  
VENTING SYSTEM  
Follow the lighting instructions. Adjust thermostat so  
appliance will operate continuously.  
At the time of removal of an existing boiler, follow these  
steps with each appliance remaining connected to the  
common venting system placed in operation, while the  
other appliances remaining connected to the common  
venting system are not in operation:  
e. Test for spillage at the draft hood relief opening after  
5 minutes of main burner operation. Use the flame  
of a match or candle, or smoke from a cigarette,  
cigar, or pipe.  
f. After it has been determined that each appliance  
remaining connected to the common venting system  
properly vents when tested as outlined above, return  
doors, windows, exhaust fans, fireplace dampers and  
any other gas-burning appliance to their previous  
conditions of use.  
a. Seal any unused openings in the common venting  
system.  
b. Visually inspect the venting system for proper size  
and horizontal pitch and determine there is no  
blockage or restriction, leakage, corrosion and other  
deficiencies which could cause an unsafe condition.  
g. Any improper operation of the common venting  
system should be corrected so that the installation  
conforms with the current edition of the National  
Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or  
CAN/CSA B149.1, Natural Gas and Propane  
Installation Code. When resizing any portion of the  
common venting system, the common venting  
system should be resized to approach the minimum  
size as determined using the appropriate tables in  
the National Fuel Gas Code, ANSI Z223.1/NFPA 54  
and/or CAN/CSA B149.1, Natural Gas and Propane  
Installation Code.  
c. Insofar as is practical, close all building doors and  
windows and all doors between the space in which  
the appliances remaining connected to the common  
venting system are located and other spaces of the  
building. Turn on any clothes dryers and any  
appliance not connected to common venting system.  
Turn on any exhaust fans, such as range hoods and  
bathroom exhausts, so they will operate at maximum  
speed. Do not operate a summer exhaust fan. Close  
fireplace dampers.  
13  
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GAS PIPING  
5. GAS PIPING  
1. Size and install the gas supply piping properly in  
order to provide a supply of gas sufficient to meet  
the maximum demand without undue loss of  
pressure between the meter and the boiler.  
2. Determine the volume of gas to be provided to the  
boiler in cubic feet per hour. To obtain this value,  
divide the Btu per hour rating (on the boiler rating  
plate) by the heating value of the gas in Btu per  
cubic feet. Obtain the heating value of the gas from  
the gas supplier. As an alternative, use Table 5.1, 5.2  
or 5.3 on the next page to obtain the volume of gas  
to be provided to the boiler.  
3. Use the value obtained above as the basis for piping  
sizing. Size the gas piping in accordance with Table  
5.4. Consult the National Fuel Gas Code ANSI  
Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural  
Gas and Propane Installation Code for proper sizing  
options.  
Figure 5.1: Gas Connection to Boiler  
8. Disconnect the boiler and its individual shut-off valve  
from the gas supply piping system during any  
pressure testing of that system at test pressure in  
excess of 1/2 psig (3.5 kPa).  
4. Locate the drop pipe adjacent to, but not in front of  
the boiler.  
5. Install a sediment trap. See Figure 5.1. Locate a tee  
in the drop pipe at same elevation as the gas inlet  
connection to the boiler. Extend the drop pipe to a  
pipe cap.  
CAUTION  
Do not subject the gas valve to more than 1/2 psi (3.5  
kPa) pressure. Doing so may damage the valve.  
6. Install a ground joint union ahead of the gas control  
assembly to permit servicing of the control. Some  
local codes require an additional service valve when  
using the combination gas controls. If your code  
requires such a valve, a suggested location is shown  
in Figure 5.1.  
Isolate the boiler from the gas supply piping system  
by closing its individual service valve during any  
pressure testing of the gas supply piping system at  
test pressure equal to or less than 1/2 psig (3.5 kPa).  
9. Minimum permissible supply pressure for purposes of  
input adjustment:  
WARNING  
MI-09 Standing Pilot  
Natural Gas  
Use a pipe joint sealing compound that is resistant to  
the action of liquefied petroleum gas. A non-resistant  
compound may lose sealing ability in the presence of  
this gas, resulting in a gas leak and fire or explosion  
potential.  
5.2WC (1.3 kPa)  
All other MI/MIH  
Natural Gas  
5.0WC (1.2 kPa)  
All MI LP Gas  
11.0WC (2.7 kPa)  
Maximum permissible supply pressure to the boiler:  
7. Check piping for leaks.  
All MI/MIH Natural Gas  
All MI LP Gas  
13.5WC (3.5 kPa)  
13.5WC (3.5 kPa)  
Use an approved gas detector, a non-corrosive leak  
detection fluid or other leak detection method. If  
leaks are found, turn off all gas flow and repair as  
necessary.  
WARNING  
When checking for leaks, do not use matches,  
candles, open flames or other methods that provide a  
source of ignition. This can ignite a gas leak,  
resulting in fire or explosion.  
14  
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GAS PIPING  
Table 5.1: MI Boiler – Natural Gas  
Input  
Model  
Cubic Feet / Hour Cubic Meters / Hour  
MI-03  
MI-04  
MI-05  
MI-06  
MI-07  
MI-08  
MI-09  
70  
105  
140  
175  
195  
227.5  
260  
2.0  
3.0  
4.0  
5.0  
5.5  
6.4  
7.4  
Table 5.2: MI Boiler – LP Gas  
Input  
Model  
Cubic Feet / Hour Cubic Meters / Hour  
MI-03  
MI-04  
MI-05  
MI-06  
MI-07  
MI-08  
MI-09  
28  
42  
0.8  
1.2  
1.6  
2.0  
2.2  
2.6  
2.9  
56  
70  
78  
91  
104  
Table 5.3: MIH Boiler – Natural Gas  
Input  
Model  
Cubic Feet / Hour Cubic Meters / Hour  
MIH-03  
MIH-04  
MIH-05  
MIH-06  
65  
97.5  
130  
1.8  
2.8  
3.7  
4.6  
162.5  
Table 5.4: Pipe Capacity  
Capacity of pipe of different diameters and lengths in cubic feet  
per hour [cubic meter per hour] with a pressure drop of 0.3  
inches of water (75 Pa) and specific gravity of 0.60. No  
allowance for an ordinary number of fittings is required.  
Pipe  
Length in  
Feet  
3/4"  
Pipe  
1"  
Pipe  
1-1/4"  
Pipe  
1-1/2"  
Pipe  
[Meters]  
10 [3.0] 278 [7.9] 520 [14.7] 1050 [29.7] 1600 [45.3]  
20 [6.1] 190 [5.4] 350 [9.9] 730 [20.7] 1100 [31.1]  
30 [9.1] 152 [4.3] 285 [8.1] 590 [16.7]  
40 [12.2] 130 [3.7] 245 [6.9] 500 [14.2]  
50 [15.2] 115 [3.3] 215 [6.1] 440 [12.5]  
60 [18.3] 105 [3.0] 195 [5.5] 400 [11.3]  
890 [25.2]  
760 [21.5]  
670 [19.0]  
610 [17.3]  
Maximum Capacity Correction Factors for  
Specific Gravity other than 0.60.  
Specific Gravity  
Correction Factor  
Specific Gravity  
Correction Factor  
Specific Gravity  
Correction Factor  
0.50 0.55 0.60 0.65 0.70 0.75  
1.10 1.04 1.00 0.96 0.93 0.90  
0.80 0.85 0.90 1.00 1.10 1.20  
0.87 0.84 0.82 0.78 0.74 0.71  
1.30 1.40 1.50 1.60 1.70 1.80  
0.68 0.66 0.63 0.61 0.59 0.58  
15  
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ELECTRICAL  
6. ELECTRICAL  
Install all electrical wiring in accordance with the National Electrical Code and local requirements.  
NOTICE  
This unit when installed must be electrically grounded in accordance with the requirements of the authority  
having jurisdiction or, in the absence of such requirements, with the current edition of the National Electrical  
Code, ANSI/NFPA 70 and/or the Canadian Electrical Code, Part 1 CSA C22.1, Electrical Code.  
A. WIRING  
C. CONTROLS  
1. See Figure 6.1 for location of wiring and controls.  
1. For proper location of controls and accessories refer  
to Figure 6.1 and Section 11.  
Use Figures 6.2 and 6.3 to connect the boiler to a  
power supply and to connect components to the  
boiler.  
2. See the attached control sheets for specific details  
regarding the installation of the various controls.  
2. Connect the boiler by a separate, permanently live  
electrical supply line with a fused switch.  
3. This boiler is supplied with safety devices in addition  
to the limit. For a description of these devices and  
how they work to ensure the safe operation of the  
boiler, see Section 7B.  
3. Connect the vent damper harness to the damper  
motor as shown in Figure 6.1.  
4. Adjust the thermostat heat anticipator to 0.2 Amp.  
4. If the circulator is mounted in the supply piping,  
provide longer wiring harness as required.  
B. ZONED SYSTEM WIRING  
See Figure 6.5 for typical wiring with zone valves. See  
Figure 6.6 for typical wiring with zone circulators. When  
wiring a zoned heating system, follow all applicable  
codes, ordinances and regulations.  
NOTICE  
Do not power zone valves directly from the boiler  
limit. Doing so will greatly reduce the life of the  
transformer. Use a separate transformer sized to  
handle the total of all zone valve electrical loads.  
Figure 6.1: Wiring, Controls and Safety Devices  
16  
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ELECTRICAL  
Figure 6.2: Wiring and Connection Diagram – Standing Pilot (Continuous Ignition)  
Pilot flame is monitored through the pilot  
D. SEQUENCE OF OPERATION  
thermocouple. If pilot flame is lost during a call  
for heat, main and pilot gas flow will be shut off.  
The valve must then be manually reset by  
following the Lighting Instructions mounted on  
the jacket panel and included in Section 7 of this  
manual.  
1. Standing Pilot (See Figure 6.2 above)  
a. The vent damper is continuously powered. On a  
call for heat, limit relay R is energized, which  
energizes:  
the circulator (when used) through contact  
R1, and  
c. When the call for heat ends:  
the vent damper operator through contact R2,  
provided that the high-limit switch is  
closed.  
Limit relay R de-energizes, which opens  
contacts R1 and R2.  
The circulator shuts down.  
The gas valve de-energizes.  
The vent damper closes.  
The vent damper operator opens the damper.  
b. Once the damper is proven open, the gas valve  
energizes, provided that all of the following  
conditions are met:  
d. If temperature exceeds limit setting, main burners  
shut off and circulator continues to operate.  
the pilot thermocouple is proving flame  
the blocked vent switch is closed, and  
the flame rollout switch is closed.  
17  
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ELECTRICAL  
Figure 6.3: Wiring and Connection Diagram – Intermittent Ignition  
the blocked vent switch is closed, and  
the flame rollout switch is closed.  
c. When the call for heat ends:  
2. Intermittent Ignition (see Figure 6.3 above)  
a. The vent damper is continuously powered. On a  
call for heat, limit relay R is energized, which  
energizes:  
Limit relay R de-energizes, which opens  
contacts R1 and R2.  
the circulator (when used) through contact  
R1, and  
The circulator shuts down.  
the vent damper operator through contact R2,  
The gas valve de-energizes.  
provided that the high-limit aquastat switch is  
closed.  
The vent damper closes.  
d. If temperature exceeds limit setting, main burners  
shut off and circulator continues to operate.  
The damper operator opens the vent damper.  
b. Once the damper is proven open, the ignition  
circuit within the gas valve energizes, provided  
that all of the following conditions are met:  
18  
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ELECTRICAL  
Figure 6.4: Intermittent Ignition System Operating Sequence  
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ELECTRICAL  
Figure 6.5: Zone Wiring with Zone Valves  
Figure 6.6: Zone Wiring with Circulators  
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START-UP PROCEDURES  
7. START-UP PROCEDURES  
8. Connect a manometer to the gas valve on the valve  
outlet (gas manifold). Use the 1/8 NPT tapping  
provided.  
A. COMPLETING THE INSTALLATION  
1. Confirm that all water, gas and electricity are  
turned off.  
9. Confirm that the gas supply pressure to the boiler is  
above the minimum and below the maximum values  
for the gas being used. See the end of Section 5 for  
these values. If a supply pressure check is required,  
isolate the boiler and gas valve before performing  
the pressure check. If the supply pressure is too high  
or too low, contact the gas supplier.  
2. Inspect the boiler combustion chamber for foreign  
objects and remove if present.  
3. Check physical condition of burners and pilot. Make  
certain that there are no unusual bends or  
perforations in the burners or pilot. Replace  
components if necessary.  
10. Turn on electricity and gas to boiler.  
4. Verify that water piping, venting, gas piping and  
electrical wiring and components are installed  
properly. Refer back to previous sections of these  
instructions as well as equipment manufacturer’s  
instructions as necessary.  
11. Light the boiler by following the Lighting/Operating  
Instructions label mounted to the jacket panel. The  
initial ignition may require several tries as the piping  
is purged of air.  
12. Use the sequence descriptions in Figures 6.2, 6.3  
and 6.4 in Section 6 (Electrical) to follow light-off  
and shutdown sequences and to assist in diagnosing  
problems. If the boiler does not function properly,  
consult Section 8, Troubleshooting.  
5. Fill the boiler and system with water, making certain  
to vent all air from all points in the system. To check  
water level in the system, open and close each vent  
in the system. Water should exit from each vent  
when it is opened.  
13. The gas manifold and control assembly are made of  
gas-tight, completely factory assembled and installed  
components of the base assembly. See Figure 7.1  
and 7.2.  
6. The pressure reducing valve on the fill line will  
typically allow the system to be filled and pressurized  
to 12 psi (83 kPa). Consult the valve and expansion  
tank manufacturer for more specific information.  
7. Check joints and fittings throughout the system for  
leaks. If leaks are found, drain the system and repair  
as required.  
21  
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START-UP PROCEDURES  
Figure 7.1: Gas Valve, Manifold and Burner Assembly – Standing Pilot (Continuous Ignition)  
Figure 7.2: Gas Valve, Manifold and Burner Assembly – Intermittent Ignition  
Figure 7.3: Valve Tapping and Adjustment Screw Locations  
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START-UP PROCEDURES  
Figure 7.4: Operating Instructions  
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START-UP PROCEDURES  
FOR YOUR SAFETY READ BEFORE LIGHTING  
WARNING: If you do not follow these instructions exactly, a fire or explosion may  
result causing property damage, personal injury, or loss of life.  
A. This appliance has a pilot which must be lighted by  
hand. When lighting the pilot, follow these  
instructions exactly.  
If you cannot reach your gas supplier, call the fire  
department.  
C. Use only your hand to push in or turn the gas control  
knob. Never use tools. If the knob will not push in or  
turn by hand, don't try to repair it, call a qualified  
service technician. Force or attempted repair may  
result in a fire or explosion.  
B. BEFORE LIGHTING smell all around the appliance area  
for gas. Be sure to smell next to the floor because  
some gas is heavier than air and will settle on the  
floor.  
WHAT TO DO IF YOU SMELL GAS  
Do not try to light any appliance  
Do not touch any electric switch;  
do not use any phone in your building  
Immediately call your gas supplier from a neighbor's  
phone. Follow the gas supplier's instruction.  
D. Do not use this appliance if any part has been under  
water. Immediately call a qualified service technician  
to inspect the appliance and to replace any part of the  
control system and any gas control which has been  
under water.  
LIGHTING INSTRUCTIONS  
1. STOP! Read the safety information above on this  
label.  
8. Find pilot - follow metal tube  
from gas valve. The pilot is  
between two burner tubes  
2. Set the thermostat to lowest setting.  
Pilot Burner  
9. Turn the gas control knob counterclockwise  
"PILOT".  
to  
3. Turn off all electric power to the appliance.  
4. If the gas valve is not visible, remove control access  
panel.  
10. Push in red reset button all the way and hold in.  
Immediately light the pilot with a match. Continue to  
hold the reset button in for about one (1) minute after  
the pilot is lit. Release button and it will pop back up.  
Pilot should remain lit. If it goes out, repeat steps 5  
through 10.  
5. If the gas control knob is not in the "OFF" position,  
turn the knob clockwise  
to "OFF".  
Gas Control Knob  
(shown in "OFF"  
position)  
Red Reset Button  
If button does not pop up when released, stop and  
immediately call your service technician or gas  
supplier.  
If the pilot will not stay lit after several tries, turn the  
gas control knob to "OFF" and call your service  
technician or gas supplier.  
11. Replace pilot access panel, if applicable.  
6. Wait five (5) minutes to clear out any gas. Then smell  
for gas, including near the floor. If you smell gas,  
STOP! Follow "B" in the safety information above on  
this label. If you don't smell gas, go to the next step.  
12. Turn gas control knob counterclockwise  
13. Replace control access panel, if applicable.  
14. Turn on all electric power to the appliance.  
15. Set thermostat to desired setting.  
to "ON".  
7. Remove the pilot access panel, if supplied, located  
below and behind the gas valve directly above burner  
tubes.  
TO TURN OFF GAS TO APPLIANCE  
1. Set the thermostat to lowest setting.  
4. Turn the gas control knob clockwise  
to "OFF".  
2. Turn off all electric power to the appliance if service is  
to be performed.  
5. Replace control access panel, if applicable.  
3. If the gas valve is not visible, remove the control access  
panel.  
H24V VR8200/VR8300 9177R  
Figure 7.5: Lighting Instructions  
24  
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START-UP PROCEDURES  
4. When adjustment is complete, turn off boiler, gas  
flow and electricity to boiler. Remove manometer  
connection from valve and plug tapping with plug  
provided. Turn utilities back on and resume  
checkout. GAS FLOW  
B. CONTROL DESCRIPTIONS  
See Figure 6.1 in Section 6 (Electrical) for locations of  
these devices.  
1. FLAME ROLL-OUT SAFETY SHUT-OFF SWITCH  
(FLAME ROLL-OUT SWITCH) – A thermally  
activated switch located between the first burner  
from the left and the manifold bracket. The flame  
roll-out safety shut-off switch will sense excessive  
temperature caused by continued flame roll-out and  
shut down main burner gas. This is a non-recycling  
switch that must be replaced once it has been  
activated and the cause of the roll-out eliminated.  
D. ADJUSTMENT OF PILOT GAS FLOW  
To maximize thermocouple life, particularly on natural  
gas installations with gas supply pressures above 9W.C.  
(2.2 kPa), reduce the pilot gas flow.  
WARNING  
Turn off all electric power to the appliance.  
2. VENT SAFETY SHUT-OFF SWITCH (SPILL  
SWITCH) – A thermally activated, manually  
resetable switch located in the draft hood relief  
opening. If venting system becomes partially or  
totally blocked, the vent safety shut-off switch will  
sense excessive temperature caused by flue products  
exiting the draft hood relief opening and shut down  
main burner gas.  
Turn Gas Control Knob to “Pilot” position as shown  
in Figure 7.3.  
1. Locate and remove the pilot adjustment cap screw  
using Figure 7.3.  
2. Remove pilot observation port cover on base front  
panel.  
3. LIMIT (AQUASTAT) – A thermally activated,  
manually adjustable switch located on the left side of  
the boiler, towards the top and rear. The temperature  
sensing element is placed in the supply and will shut  
down main burner gas if the supply water exceeds  
the preset temperature limit. This is a recycling  
switch that will automatically reset when the supply  
water falls below the preset temperature.  
3. Turn the pilot adjustment screw clockwise until the  
pilot flame extinguishes. Then increase the pilot flow  
just to the point that the gas valve holds in when  
relighting the pilot per steps 9 and 10 of Lighting  
Instructions in Figure 7.5 (turn screw no more than  
an 1/8 turn).  
4. Turn on electric power to the appliance.  
4. LOW WATER CUT-OFF (FOR GRAVITY SYSTEMS  
OR HOT WATER BOILERS INSTALLED ABOVE  
RADIATION LEVEL) – A level-sensing device (float  
or probe) located in supply piping near the boiler. If  
water level in the system drops below the control’s  
position, it will shut down main burner gas. The  
control will automatically reset once the water level  
rises above its position.  
NOTICE  
The first few turns of the adjustment screw may not  
cause any change in the pilot flow. Subsequent  
partial turns of the adjustment screw may have a  
great impact on pilot flow.  
5. Turn Gas Control Knob to “On” position per the  
Lighting Instructions in Figure 7.5.  
C. ADJUSTMENT OF GAS PRESSURE  
REGULATOR  
6. Verify pilot remains lit after shutdown from a boiler  
“ON” cycle of at least ten minutes. If pilot  
1. Using the manometer setup installed in part 7A, set  
manifold pressure as follows for various gases.  
extinguishes, follow Lighting Instructions in Figure  
7.5 and again slightly increase pilot flow.  
a. Natural Gas . . .3.5Water Column (0.9 kPa)  
b. LP Gas . . . . .10.0Water Column (2.5 kPa)  
7. Make a final slight increase in the size of the pilot to  
ensure sufficient pilot signal under all operating  
conditions, just to the point that you observe a slight  
increase in the size of the flame (no more than an  
1/8 turn).  
8. Replace adjustment cap screw and observation port  
cover.  
2. To adjust gas pressure, turn adjusting screw of gas  
pressure regulator counterclockwise to decrease  
pressure, clockwise to increase pressure. Refer to  
Figure 7.3 for location of gas pressure regulator.  
Replace the cap screw when adjustment is complete.  
3. In no case should the final manifold pressure vary  
more than 0.3 inches water column (0.07 kPa)  
from the above specified pressures. Any necessary  
major changes in the flow should be made by  
changing the size of the burner orifice spuds.  
25  
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START-UP PROCEDURES  
Table 7.1b: Meter Conversion – Natural Gas  
(SI Metric Units)  
E. CHECKING BURNER INPUT  
1. Refer to rating label mounted on the jacket top panel  
to obtain the rated BTU per hour input. In no case  
shall the input to the boiler exceed the value shown  
on the rating label.  
Burner inputs in kW for for various meter timings and  
heat values. (Table based on 0.0566 cubic meter of gas  
through meter).  
2. Check input by use of the following formulas  
(PB Heat, LLC suggests reading meter for 2 Cu. Ft.):  
Heat Value of Gas  
(MJ/cubic meter)  
Time that  
meter is  
read (sec)  
37.26  
38.19  
39.12  
U.S. Customary Units  
Input (BTU/Hr.)= 3600 x F x H  
T
25  
30  
35  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
90  
95  
84.36  
70.30  
60.25  
52.72  
46.86  
42.18  
38.34  
35.15  
32.44  
30.13  
28.12  
26.36  
24.81  
23.43  
22.20  
21.09  
20.08  
19.17  
18.34  
17.57  
16.87  
86.46  
72.05  
61.76  
54.04  
48.03  
43.23  
39.30  
36.03  
33.25  
30.88  
28.82  
27.02  
25.43  
24.02  
22.75  
21.62  
20.59  
19.65  
18.80  
18.01  
17.29  
88.57  
73.81  
63.26  
55.35  
49.20  
44.28  
40.26  
36.90  
34.06  
31.63  
29.52  
27.68  
26.05  
24.60  
23.31  
22.14  
21.09  
20.13  
19.25  
18.45  
17.71  
Where:  
3600 – Seconds per hour  
F – Cubic Feet of Gas Registered on Meter  
H – Heat Value of Gas in BTU/Cubic Feet  
T – Time in Seconds the Meter is Read  
SI Metric Units  
Input (kW)= 3600 x F x H  
T x 3.6  
Where:  
3600 – Seconds per hour  
3.6 – Megajoule (MJ) per kilowatt hour (kwhr)  
F – Cubic Meters of Gas Registered on Meter  
H – Heating Value of Gas in MJ/Cubic Meter  
T – Time in Seconds the Meter is Read  
100  
105  
110  
115  
120  
125  
3. As an alternative, use Table 7.1(a) and 7.1(b). Use  
the heating value provided by gas supplier. Use a  
stopwatch to record the time it takes for 2 cubic feet  
(0.0566 cubic meter) of gas to pass through the  
meter. Read across and down to determine rate.  
F. CHECK-OUT PROCEDURE  
Table 7.1a: Meter Conversion – Natural Gas  
(U.S. Customary Units)  
1. After starting the boiler, be certain all controls are  
working properly. Check to be sure that the limit will  
shut off the boiler in the event of excessive water  
temperature. This can be done by lowering the limit  
setting until the main burners shut down. When  
proper limit function is confirmed, return the dial to  
its previous setting.  
Burner inputs in Btu/hr for various meter timings and heat  
values. (Table based on 2 cubic feet of gas through meter).  
Heat Value of Gas  
Time that  
(Btu/cubic foot)  
meter is  
read (sec)  
1000  
1025  
1050  
2. To check operation of the ignition system safety  
shut-off features:  
25  
30  
35  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
90  
95  
288000  
240000  
205714  
180000  
160000  
144000  
130909  
120000  
110769  
102857  
96000  
90000  
84706  
80000  
75789  
72000  
68571  
65455  
62609  
60000  
57600  
295200  
246000  
210857  
184500  
164000  
147600  
134182  
123000  
113538  
105429  
98400  
92250  
86824  
82000  
77684  
73800  
70286  
67091  
64174  
61500  
59040  
302400  
252000  
216000  
189000  
168000  
151200  
137455  
126000  
116308  
108000  
100800  
94500  
88941  
84000  
79579  
75600  
72000  
68727  
65739  
63000  
a. Standing Pilot:  
i) Turn the gas control knob counterclockwise to  
“PILOT”. The main burner should go out  
and the pilot should remain lit.  
ii) Extinguish the pilot flame. Pilot gas flow  
should stop within 2-1/2 minutes. Complete  
shutdown is proven since the safety shut-off  
valve has stopped main and pilot gas flow.  
iii) Reset the boiler by following Lighting  
Instructions.  
iv) Observe boiler operation through one  
complete cycle.  
100  
105  
110  
115  
120  
125  
60480  
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START-UP PROCEDURES  
b. Intermittent Ignition System:  
i) Turn gas supply off.  
5. Check the expansion tank and automatic fill valve (if  
used) to confirm that they are operating correctly. If  
either of these components causes high pressure in  
the system, the boiler relief valve will weep or open,  
allowing fresh water to enter the system.  
ii) Set thermostat or controller above room  
temperature to call for heat. Watch for igniter  
glow at pilot burner.  
6. Do not allow the system controls to subject the boiler  
to excessively low water temperatures, which would  
cause condensation of flue gases and corrosion of  
the boiler. Operate the boiler at a temperature above  
130°F (54°C). Adjust the boiler limit as required to  
maintain boiler temperature above this level.  
iii) Igniter will continue to glow for 30 seconds,  
de-energize for 30 seconds, then re-energize  
and glow for another 30 seconds. It will then  
de-energize for 5 minutes before restarting  
the sequence.  
7. Check the general condition of the system including  
piping support, joints, etc. Check cleanliness of the  
radiators, baseboard units and/or convectors. Clean  
them to the extent possible. If radiators do not heat  
evenly, vent any remaining air from them.  
iv) Turn gas supply on.  
v) Reset the boiler and control by following  
Operating Instructions.  
8. Review operation and User’s Information Manual  
with end-user.  
vi) Observe boiler operation through one  
complete cycle.  
9. Complete the Warranty Card and submit it to  
PB Heat, LLC.  
3. Low Water Cut-Off (if used) – Consult the  
manufacturer’s instructions for the low water cut-off  
operational check procedure.  
10. Hang the Installation, Operation and Maintenance  
Manual and User’s Information Manual in an  
accessible position near the boiler.  
4. Check the system to make sure there are no leaks or  
overfilling problems which might cause excessive  
make-up water to be added. Make-up water causes  
liming in the boiler and brings in oxygen. Oxygen  
can cause severe damage to the boiler though  
oxygen corrosion pitting.  
27  
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TROUBLESHOOTING  
8. TROUBLESHOOTING  
DANGER  
A. SHUT-DOWN CAUSED BY PILOT  
OUTAGE, BLOCKED VENT SHUT-OFF  
SWITCH OR FLAME ROLL-OUT SAFETY  
SHUT-OFF SWITCH  
When servicing or replacing items that communicate  
with the boiler water, be certain that:  
There is no pressure on the boiler.  
In the event of a shut-down caused by a pilot outage,  
action of the blocked vent shut-off switch or flame roll-  
out safety shut-off switch effecting a shut-down of the  
main burners:  
The boiler is not hot.  
The power is off.  
When servicing the gas valve or pilot, be certain that:  
The gas is off.  
The electricity is off.  
a. Refer to the Lighting/Operating Instructions in  
Figures 7.4 and 7.5 to properly turn off the gas to  
the boiler.  
b. Turn off all electric power to the boiler.  
c. Call a qualified heating service organization or local  
gas company and have the cause of the shut-down  
investigated and corrected.  
d. Refer to Lighting/Operating Instructions to  
re-start boiler.  
WARNING  
Do not use this appliance if any part has been under  
water. Improper or dangerous operation may result.  
Immediately call a qualified service technician to  
inspect the boiler and to replace any part of the  
control system and any gas control which has been  
under water.  
B. TROUBLESHOOTING GUIDES  
Use Table 8.1 to assist in determining causes and  
providing corrective actions to boiler problems. Refer  
also to Figure 8.1 to troubleshoot the Intermittent  
Ignition System Control. These guides must be used  
only by qualified service technicians. These individuals  
must follow all applicable codes and regulations in repair  
of any boiler problems.  
CAUTION  
Label all wires prior to disconnection when servicing  
controls. Wiring errors can cause improper and  
dangerous operation. Verify proper operation after  
servicing.  
CAUTION  
Should overheating occur or the gas supply fail to  
shut off, do not turn off or disconnect the electrical  
supply to the pump. This may aggravate the problem  
and increase the likelihood of boiler damage. Instead,  
shut off the gas supply at a location external to the  
appliance.  
28  
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TROUBLESHOOTING  
Table 8.1: Boiler Troubleshooting Guide  
PROBLEM  
POSSIBLE CAUSES  
CORRECTIVE ACTIONS  
Burners not functioning.  
1. No power.  
1. Check line voltage wiring and fuses.  
2. Limit (Aquastat) not working.  
2. Check wiring and contacts, relay, temperature  
setting. Clean and adjust as necessary.  
3. Flame rollout switch open.  
4. Blocked vent switch open.  
5. Gas off at boiler gas valve.  
3. Replace switch. Locate cause and correct.  
4. Reset blocked vent switch. Locate cause and correct.  
5. Start boiler using Lighting/Operating  
Instructions.  
6. Gas off external to boiler.  
7. Plugged orifice spuds.  
8. Defective gas valve.  
6. Check any gas valves in the line.  
7. Check, clean and re-install.  
8. Use Figure 8.1 to troubleshoot intermittent  
ignition gas valve. Replace if necessary.  
9. Improper wiring.  
9. Check and correct in accordance with wiring  
diagrams in Section 6.  
10. Vent damper malfunctioning.  
10. Refer to vent damper manufacturer’s instructions.  
Replace if necessary.  
Burners will not shut  
down.  
1. Defective gas valve.  
2. Short circuit.  
1. Use Figure 8.1 to troubleshoot intermittent  
ignition gas valve. Replace if necessary.  
2. Check and correct wiring.  
Flashback or burning  
at orifice spuds.  
1. Manifold gas pressure too low.  
2. Improperly sized/drilled orifice spuds.  
3. Leaking gas valve.  
1. Adjust to proper pressure.  
2. Install correct spuds.  
3. Replace valve.  
4. Burrs on orifice.  
4. Remove burrs.  
5. Low supply gas pressure.  
5. Contact gas supplier if natural gas. Adjust  
regulator if LP gas.  
6. Excessive downdraft or draft problems in  
boiler room.  
6. Check air supply, ventilation and venting system.  
Delayed ignition.  
1. Insufficient pilot flame.  
2. Pilot burner/orifice clogged.  
3. Overfiring.  
1. Increase pilot gas flow.  
2. Clean pilot burner and orifice.  
3. Reduce rate to input on rating label.  
4. Realign burners or pilot.  
4. Misaligned burners or pilot.  
5. Draft problem in boiler room.  
5. Check air supply, ventilation and venting  
system.  
Excessive condensation in  
vent.  
1. Underfiring.  
1. Increase rate to input on rating label.  
2. Reset aquastat to higher setting.  
2. Limit (Aquastat) set too low.  
3. Vent pipe too long.  
3. Reposition boiler to reduce length.  
4. Check chimney and venting recommendations.  
4. Inadequate chimney or venting system.  
Boiler not heating  
properly.  
1. Underfiring.  
1. Increase rate to input on rating label.  
2. Reset aquastat to higher setting.  
3. Vent air from all points in system.  
4. Check circulator, replace if necessary.  
2. Limit set too low.  
3. Air in system.  
4. Circulator malfunctioning.  
5. Circulation system clogged.  
5. Shut down and cool boiler, drain and flush  
system.  
6. Incorrect thermostat heat anticipator setting.  
6. Adjust heat anticipator.  
Fumes or gas odors  
1. Leaks in gas piping or fittings.  
2. Leaks in gas service line or meter.  
3. Obstructed chimney.  
1. Locate and repair or replace.  
2. Shut down boiler and notify gas provider.  
3. Check, repair and/or clean chimney.  
4. Clean flueways or vent and remove obstructions.  
4. Obstructed flueways or vent.  
5. Undersized chimney or vent, high draft loss  
in vent.  
5. Check National Fuel Gas Code and vent  
manufacturer’s recommendations.  
6. Draft problem in boiler room.  
7. Overfiring.  
6. Check air supply, ventilation and venting system.  
7. Reduce rate to input on rating label.  
8. Vent damper malfunctioning.  
8. Refer to vent damper manufacturer’s instructions.  
Replace if necessary.  
29  
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TROUBLESHOOTING  
Figure 8.1: Intermittent Ignition System Troubleshooting Sequence  
30  
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MAINTENANCE  
9. MAINTENANCE  
WARNING  
Product Safety Information  
Refractory Ceramic Fiber Product  
This appliance contains materials made from refractory ceramic fibers (RCF). Airborne RCF,  
when inhaled, have been classified by the International Agency for Research on Cancer  
(IARC), as a possible carcinogen to humans. After the RCF materials have been exposed to  
temperatures above 1800°F (980°C), they can change into crystalline silica, which has been  
classified by the IARC as carcinogenic to humans. If particles become airborne during  
service or repair, inhalation of these particles may be hazardous to your health.  
Avoid Breathing Fiber Particulates and Dust  
Suppliers of RCF recommend the following precautions be taken when handling these  
materials:  
Precautionary Measures:  
Provide adequate ventilation.  
Wear a NIOSH/MSHA approved respirator.  
Wear long sleeved, loose fitting clothing and gloves to prevent skin contact.  
Wear eye goggles.  
Minimize airborne dust prior to handling and removal by water misting the material and  
avoiding unnecessary disturbance of materials.  
Wash work clothes separately from others. Rinse washer thoroughly after use.  
Discard RCF materials by sealing in an airtight plastic bag.  
First Aid Procedures:  
Inhalation: If breathing difficulty or irritation occurs, move to a location with fresh clean air.  
Seek immediate medical attention if symptoms persist.  
Skin Contact: Wash affected area gently with a mild soap and warm water. Seek immediate  
medical attention if irritation persists.  
Eye Contact: Flush eyes with water for 15 minutes while holding eyelids apart. Do not rub  
eyes. Seek immediate medical attention if irritation persists.  
Ingestion: Drink 1 to 2 glasses of water. Do not induce vomiting. Seek immediate medical  
attention.  
31  
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MAINTENANCE  
A. GENERAL  
4. Check for water leaks in boiler and system piping.  
5. Smell around the appliance area for gas. If you smell  
gas, follow the procedure listed in the  
1. Disconnect this boiler from the gas supply piping  
during any pressure testing of the gas system.  
Lighting/Operating Instructions in Section 7.  
2. Check pipes adjacent to cold walls or in unheated  
spaces. Insulate and tape them if necessary to be  
sure they can’t freeze up. Keeping the water moving  
at all times will reduce the likelihood of freezing. See  
Section 3 for glycol instructions.  
C. WEEKLY (WITH BOILER IN USE)  
1. Flush float-type low-water cut-off (if used) to remove  
sediment from the float bowl as stated in the  
manufacturer’s instructions.  
3. If there is considerable foreign matter in the boiler  
water, the boiler should be shut down and allowed to  
cool, then drained and thoroughly flushed out. Use  
the drain valve at the bottom of the return  
D. MONTHLY (WITH BOILER IN USE)  
1. Check boiler room floor drains for proper  
functioning.  
connection to drain the boiler. Pipe the drain cock to  
a suitable drain or containment device if a glycol  
solution is used. Flush the system to remove  
remaining matter. If there is evidence that hard scale  
has formed on the internal surfaces, the boiler  
should be cleaned by chemical means as prescribed  
by a qualified water treatment specialist.  
2. Check function of the safety relief valve (monthly  
unless specified otherwise by manufacturer) by  
performing the following test:  
a. Check valve piping to determine that it is  
properly installed and supported.  
4. There must not be signs of continuous wetness at the  
chimney. If signs of continuous wetness are  
observed, a qualified service agency must be  
consulted to modify the vent configuration to prevent  
the formation of condensate.  
b. Check boiler operating temperature and pressure.  
c. Lift the try lever on the safety relief valve to the  
full open position and hold it for at least five  
seconds or until clean water is discharged.  
d. Release the try lever and allow the valve to close.  
If the valve leaks, operate the lever two or three  
times to clear the valve seat of foreign matter. It  
may take some time to determine if the valve has  
shut completely.  
B. DAILY (WITH BOILER IN USE)  
Daily boiler observation can be performed by the owner.  
If any potential problems are found, a qualified installer  
or service technician/agency must be notified.  
1. Remove any combustible materials, gasoline and  
other flammable liquids and substances that generate  
flammable vapors from the area where the boiler is  
contained. Make certain that the boiler area has  
ample air for combustion and ventilation and that  
there are no obstructions to the free flow of air to  
and from the boiler.  
e. If the valve continues to leak, it must be replaced  
before the boiler is returned to operation.  
f. Check that operating pressure and temperature  
have returned to normal.  
g. Check again to confirm that valve has closed  
completely and is not leaking.  
2. Observe general boiler conditions (unusual noises,  
vibrations, etc.)  
3. Test low-water cut-off (if used) as described by the  
manufacturer.  
3. Observe operating temperature and pressure on the  
combination gauge located on the left side of the  
boiler. Boiler pressure should never be higher than  
5 psi (35 kPa) below the rating shown on the safety  
relief valve; 25 psig (172 kPa) maximum for a 30  
psig (207 kPa) rating, 45 psig (310 kPa) maximum  
for a 50 psig (345 kPa) rating). The valve rating can  
be found on the top of the safety relief valve (see  
Figure 5 for location of the safety relief valve).  
Boiler temperature should never be higher than  
250°F (121°C).  
4. Test limit as described in Section 7F, Check-Out  
Procedure.”  
5. Test function of gas safety shut-off features as  
described by gas valve and ignition control  
manufacturer.  
6. Cycle the boiler at least once and check operation of  
the vent damper.  
32  
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MAINTENANCE  
E. ANNUALLY (BEFORE START OF HEATING  
SEASON)  
DANGER  
When servicing or replacing components, be  
absolutely certain that the following conditions are  
met:  
Water, gas and electricity are off.  
The boiler is at room temperature.  
There is no pressure in the boiler.  
1. Check flueways and burners for cleanliness and clean  
if necessary. Use the following procedure if cleaning  
is required:  
Figure 9.1: Standing Pilot and Main Burner Flame  
a. Refer to the Lighting/Operating Instructions in  
Figures 7.4 and 7.5 to properly turn off the gas to  
the boiler.  
b. Turn off all electrical power to the boiler.  
c. Remove burners and brush orifice spuds lightly  
using a soft bristle brush.  
d. Remove the vent pipe, vent damper, top jacket  
panels and flue collector/draft diverter. Remove  
baffles on MIH models.  
e. Brush flueways with wire brush.  
f. To the extent possible, inspect inside of vent pipe  
and vent damper for obstructions in flow or vent  
damper movement. Remove or replace as  
necessary.  
g. Re-install baffles on MIH models. When replacing  
the flue collector/draft hood, be certain that the  
blanket seal between the flue collector and top  
section makes a tight seal to prevent leakage of  
the products of combustion.  
Figure 9.2: Intermittent Pilot and Main  
Burner Flame  
h. Re-install the top of the jacket, vent damper and  
vent pipe.  
i. Re-install burners.  
2. Inspect entire venting system for corrosion, support  
and joint integrity. Repair as necessary.  
3. Check the pilot and main burner flame. See Figures  
9.1 and 9.2. The pilot should provide a steady flame  
enveloping 3/8to 1/2(1 cm to 1.2 cm) of the  
flame sensor. If required, adjust the pilot as stated in  
the gas valve manufacturer’s instructions or  
paragraph 7.D. The main burner flame inner cone  
should be approximately 1-1/2(4 cm) high and  
should have a very sharp, blue color characteristic.  
33  
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BOILER DIMENSIONS & RATINGS  
10. BOILER DIMENSIONS & RATINGS  
Figure 10.1:Boiler Views  
Table 10.1: Series MI/MIH Boiler Dimensions  
SERIES MI/MIH BOILER DIMENSIONS  
Jacket  
Left of Jacket to Rear of Jacket to Vent Connector  
Boiler  
Model  
Number  
Width  
“A”  
Depth  
“B”  
To Floor  
“C”  
c/l of Vent “D”  
c/l of Vent “E”  
Size “F”  
inch  
mm  
318  
403  
489  
575  
660  
746  
832  
inch  
mm  
676  
676  
676  
676  
676  
752  
752  
inch  
mm  
797  
797  
797  
797  
797  
797  
797  
inch  
mm  
159  
195  
244  
287  
330  
373  
416  
inch  
20¹³⁄₁₆  
20¹³⁄₁₆  
21¹³⁄₁₆  
21¹³⁄₁₆  
21¹³⁄₁₆  
23⁵⁄₁₆  
24⁵⁄₁₆  
mm  
529  
529  
554  
554  
554  
592  
618  
inch  
mm  
127  
127  
152  
152  
178  
203  
203  
MI/MIH-03  
MI/MIH-04  
MI/MIH-05  
MI/MIH-06  
MI-07  
12¹⁄₂  
15⁷⁄₈  
19¹⁄₄  
22⁵⁄₈  
26  
26⁵⁄₈  
26⁵⁄₈  
26⁵⁄₈  
26⁵⁄₈  
26⁵⁄₈  
29⁵⁄₈  
29⁵⁄₈  
31³⁄₈  
31³⁄₈  
31³⁄₈  
31³⁄₈  
31³⁄₈  
31³⁄₈  
31³⁄₈  
6¹⁄₄  
7¹¹⁄₁₆  
9⁵⁄₈  
11⁵⁄₁₆  
13  
5
5
6
6
7
8
8
MI-08  
MI-09  
29³⁄₈  
32³⁄₄  
14¹¹⁄₁₆  
16³⁄₈  
Table 10.2: Series MI/MIH Boiler Ratings  
SERIES MI/MIH BOILER RATINGS  
Seasonal  
Efficiency  
Std Pilot Intermittent  
Seasonal  
Efficiency  
DOE Heating  
Capacity³  
Net I=B=R Ratings  
Input  
,
Boiler  
Model  
Water¹ ²  
Water Content  
w/Damper³  
Ignition³  
Number  
MBH  
kW  
MBH  
kW  
MBH  
kW  
AFUE  
AFUE  
MI MIH MI MIH MI MIH MI MIH MI MIH MI MIH MI MIH MI MIH Gallon Liter  
MI/MIH-03  
70  
65  
21  
19  
29  
38  
48  
58  
86  
54  
81  
17  
25  
34  
42  
47  
55  
62  
16  
24  
32  
40  
50  
75  
100 94  
47  
70  
15  
22  
29  
14  
21  
28  
34  
80.2 N/A 82.2 83.2  
80.2 N/A 82.1 83.1  
80.2 N/A 82.0 83.0  
80.3 N/A 82.0 83.0  
4.72  
6.00  
7.28  
8.56  
9.84  
17.87  
22.71  
27.55  
32.40  
37.24  
42.09  
46.93  
MI/MIH-04 105 97.5 31  
MI/MIH-05 140 130 41  
MI/MIH-06 175 162.5 51  
MI-07  
MI-08  
MI-09  
115 108  
143 135  
124 117 36  
195 N/A  
227.5 N/A  
260 N/A  
57  
67  
76  
N/A 160 N/A  
N/A 186 N/A  
N/A 211 N/A  
N/A 139 N/A 41 N/A 80.5 N/A 82.0 N/A  
N/A 162 N/A 47 N/A 80.3 N/A 82.0 N/A  
N/A 183 N/A 54 N/A 80.1 N/A 82.0 N/A  
11.12  
12.40  
1 Net I=B=R water ratings based on an allowance of 1.15.  
2 Consult factory before selecting a boiler for installations having unusual piping and pickup requirements, such as intermittent system operation,  
extensive piping systems, etc.  
3 Heating Capacity and Annual Fuel Utilization Efficiency (AFUE) ratings are based on U.S. Government test.  
MIH Models Available as Natural Gas with Intermittent Ignition Only.  
34  
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REPAIR PARTS  
11. REPAIR PARTS  
REPAIR PARTS  
SERIES MI/MIH GAS BOILER  
Repair parts are available from your installer or by contacting PB Heat, LLC, New  
Berlinville, PA 19545-0447. Use the figures and tables on pages 34-40 to assist in  
ordering parts.  
Note: Remember to include boiler model number and serial number when ordering parts.  
Figure 11.1: Base/Combustible Floor Pan  
Table 11.1: Base/Combustible Floor Pan  
Item  
No.  
Part Selection  
Information  
MI/MIH MI/MIH MI/MIH MI/MIH  
Description  
MI-07  
MI-08  
MI-09  
-03  
-04  
-05  
-06  
1
2
3
4
Base Assembly  
7800  
51771  
50867  
90700  
7801  
51771  
50867  
90701  
7802  
51771  
50867  
90702  
7803  
51771  
50867  
90703  
7804  
51771  
50867  
90704  
7805  
51771  
50867  
90705  
7806  
51771  
50867  
90706  
Observation Cover Door  
Base Blanket Seal  
Specify length  
Combustible Floor Pan Assembly  
*For elevations over 2,000 feet above sea level contact PB Heat, LLC.  
35  
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REPAIR PARTS  
Figure 11.2:Manifold  
Table 11.2: Manifold/Gas Train (MI – Standing Pilot)  
Item  
No.  
Part Selection  
Information  
Description  
Steel Burner  
MI-03 MI-04 MI-05 MI-06 MI-07 MI-08 MI-09  
5
6
7
Specify quantity  
51537 51537 51537 51537 51537 51537 51537  
51263 51263 51263 51263 51263 51263 51263  
50978 50979 50980 50981 50954 50955 50956  
Steel Burner w/ Pilot Clip  
Gas Manifold  
1 per boiler  
Natural Gas, 0-2000 ft. (0-610 m)  
8
Orifice Spud, #48  
Orifice Spud, #49  
Orifice Spud, #56  
Orifice Spud, #57  
50894 50894 50894 50894  
elevation (specify qty)*  
Natural Gas, 0-2000 ft. (0-610 m)  
50895 50895 50895  
elevation (specify qty)*  
LP Gas, 0-2000 ft. (0-610 m)  
50899 50899 50899 50899  
elevation (specify qty)  
LP Gas, 0-2000 ft. (0-610 m)  
50900 50900 50900  
elevation (specify qty)  
9
Honeywell VR8200A2116 Gas Valve  
Honeywell VR8200C6040 Gas Valve  
Honeywell VR8300A4003 Gas Valve  
Honeywell VR8300C4035 Gas Valve  
Natural Gas  
LP Gas  
50581 50581 50581  
50221 50221 50221  
Natural Gas  
LP Gas  
50587 50587 50587 50587  
91333 91333 91333 91333  
10 Honeywell Q314A3505 Pilot  
Honeywell Q314A3703 Pilot  
Natural Gas  
LP Gas  
51688 51688 51688 51688 51688 51688 51688  
50555 50555 50555 50555 50555 50555 50555  
51318 51318 51318 51318 51318 51318 51318  
11 Johnson K16BA-24D Thermocouple  
*For elevations over 2,000 feet above sea level contact PB Heat, LLC.  
36  
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REPAIR PARTS  
Figure 11.3a: Gas Valve and Pilot – Standing Pilot  
(Continuous Ignition)  
Figure 11.3b: Gas Valve and Pilot – Intermittent  
Ignition  
Table 11.3a:  
Manifold/Gas Train (MI – Intermittent Ignition)  
Item  
No.  
Part Selection  
Information  
Description  
MI-03 MI-04 MI-05 MI-06 MI-07 MI-08 MI-09  
5
6
7
Steel Burner  
Specify quantity  
51537 51537 51537 51537 51537 51537 51537  
51539 51539 51539 51539 51539 51539 51539  
50978 50979 50980 50981 50954 50955 50956  
Steel Burner w/ Pilot Clip  
Gas Manifold  
1 per boiler  
Natural Gas, 0-2000 ft. (0-610 m)  
8
Orifice Spud, #48  
Orifice Spud, #49  
Orifice Spud, #56  
Orifice Spud, #57  
50894 50894 50894 50894  
50895 50895 50895  
50899 50899 50899  
50900 50900 50900  
elevation (specify qty)*  
Natural Gas, 0-2000 ft. (0-610 m)  
elevation (specify qty)*  
LP Gas, 0-2000 ft. (0-610 m)  
elevation (specify qty)  
LP Gas, 0-2000 ft. (0-610 m)  
elevation (specify qty)  
9
Honeywell SV9501M2700 Gas Valve Natural Gas  
Honeywell SV9501M2064 Gas Valve LP Gas  
Honeywell SV9601M4167 Gas Valve Natural Gas  
Honeywell SV9601M4225 Gas Valve LP Gas  
51682 51682 51682  
51691 51691 51691  
51683 51683 51683 51683  
51692 51692 51692 51692  
10 Honeywell Q3480B1025 Pilot  
Honeywell Q3480B1033 Pilot  
Natural Gas  
LP Gas  
51684 51684 51684 51684 51684 51684 51684  
51685 51685 51685 51685 51685 51685 51685  
*For elevations over 2,000 feet above sea level contact PB Heat, LLC.  
Table 11.3b:  
Manifold/Gas Train (MIH – Intermittent Ignition)  
Item  
No.  
Part Selection  
Description  
Information  
MI-03 MI-04 MI-05 MI-06  
5
6
7
Steel Burner  
Steel Burner w/ Pilot Clip  
Specify quantity  
51537 51537 51537 51537  
51539 51539 51539 51539  
50978 50979 50980 50981  
1 per boiler  
Gas Manifold  
Natural Gas, 0-2000 ft. (0-610 m)  
8
9
Orifice Spud, #49  
50895 50895 50895 50895  
elevation (specify qty)*  
Honeywell SV9501M2700 Gas Valve Natural Gas  
Honeywell SV9601M4167 Gas Valve Natural Gas  
51682 51682 51682  
51683  
10 Honeywell Q3480B1025 Pilot  
Natural Gas  
51684 51684 51684 51684  
*For elevations over 2,000 feet above sea level contact PB Heat, LLC.  
37  
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REPAIR PARTS  
Figure 11.4:Block/Draft Hood  
Table 11.4a:  
Block/Draft Hood  
Item  
No.  
Part Selection  
Information  
MI/MIH MI/MIH MI/MIH MI/MIH  
Description  
MI-07  
MI-08  
MI-09  
-03  
-04  
-05  
-06  
12  
13  
14  
Block Assembly  
Flue Collector/Draft Hood  
Flue Collector Blanket Seal  
90419  
90510  
50866  
90420  
90511  
50866  
90421  
90512  
50866  
90422  
90513  
50866  
90423  
90514  
50866  
90424  
90515  
50866  
90425  
90516  
50866  
Specify length  
Table 11.4b:  
Flue Baffles for MIH Only  
Item  
No.  
Part Selection  
Information  
MIH-  
03  
MIH-  
04  
MIH-  
05  
MIH-  
06  
Description  
15  
Flue Baffle - 4″  
Flue Baffle - 8″  
1 per flue (specify qty)  
1 per flue (specify qty)  
51583  
51583  
51583  
51584  
38  
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REPAIR PARTS  
Figure 11.5:Jacket  
Table 11.5: Jacket  
Item  
No.  
Part Selection  
Information  
MI/MIH MI/MIH MI/MIH MI/MIH  
Description  
MI-07  
MI-08  
MI-09  
-03  
-04  
-05  
-06  
16  
Jacket Assembly  
Complete jacket* with  
90445  
90446  
90447  
90448  
90449  
90450  
90451  
insulation and screws  
*Complete Jacket Consists of:  
Left Side Panel  
16  
16  
16  
16  
16  
16  
Right Side Panel  
Rear Panel  
Top Upper Front Panel  
Inner Front Baffle Panel  
Removable Front Panel  
39  
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REPAIR PARTS  
Figure 11.6:Controls/Circulator/Vent Damper  
Table 11.6: Controls/Circulator/Vent Damper  
Item  
MI/MIH MI/MIH MI/MIH MI/MIH  
Description  
No.  
MI-07  
MI-08  
MI-09  
-03  
-04  
-05  
-06  
23  
24  
25  
51689  
51774  
50501  
99950  
51587  
90592  
90593  
90612  
51689  
51774  
50501  
99950  
51587  
90592  
90593  
90612  
51689  
51774  
50501  
99950  
51587  
90592  
90593  
90613  
51689  
51774  
50501  
99950  
51587  
90592  
90593  
90613  
51689  
51774  
50501  
99950  
51587  
90592  
90593  
90614  
51689  
51774  
50501  
99950  
51587  
90592  
90593  
90615  
51689  
51774  
50501  
99950  
51587  
90592  
90593  
90615  
Honeywell L8148E1182 Limit w/ ³⁄₄Well*  
Temperature-Pressure Gauge  
Safety Relief Valve, 30 psi*, Conbraco 10-408-05  
Safety Relief Valve, 50 psi*, Watts #350  
Flame Roll-Out Safety Shut-Off Switch  
Blocked Vent Shut-Off (Spill) Switch – MI Only  
Blocked Vent Shut-Off (Spill) Switch – MIH Only  
Vent Damper  
26  
27  
27  
28  
*Available from distributor  
40  
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Series MI/MIH  
Gas Boilers  
Installation,  
Operation &  
Maintenance  
Manual  
TO THE INSTALLER:  
This manual is the property of the owner and must  
be affixed near the boiler for future reference.  
TO THE OWNER:  
This boiler should be inspected annually by  
Qualified Service Agency.  
a
ASME  
HI Division  
of gama  
PB HEAT, LLC  
PO BOX 447 • NEW BERLINVILLE, PA 19545-0447  
©2005  
MI8038 R9 (10/05-10M)  
Printed in U.S.A.  
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