Pure-Pro AGDV3 Service manual

105248-02 - 9/14
9700609
For service or repairs to boiler, call your heating contractor. When seeking information on boiler,
provide Boiler Model Number and Serial Number as shown on Rating Label.
Boiler Model Number
AGDV_-H_ Boiler Serial Number Installation Date
Heating Contractor Phone Number
Address
INSTALLATION, OPERATING
AND
SERVICE INSTRUCTIONS
ADVANTAGE DV™ SERIES
CAST IRON GAS-FIRED BOILER

2
The following terms are used throughout this manual to bring attention to the presence of hazards of various
risk levels, or to important information concerning product life.
DANGER
Indicates an imminently hazardous situation
which, if not avoided, will result in death, serious
injury or substantial property damage.
CAUTION
Indicates a potentially hazardous situation which,
if not avoided, may result in moderate or minor
injury or property damage.
WARNING
Indicates a potentially hazardous situation which,
if not avoided, could result in death, serious injury
or substantial property damage.
NOTICE
Indicates special instructions on installation,
operation, or maintenance which are important
but not related to personal injury hazards.
Table 1A: Ratings
Boiler Model Supply NPT
(inch) Return NPT (inch) Vent (inch) Air Inlet (inch) Gas NPT (inch) Relief Valve NPT (inch) Drain NPT (inch)
AGDV3 1¼ 1¼ 3 3 ½ ¾ ¾
AGDV4 1¼ 1¼ 3 3 ½ ¾ ¾
AGDV5 1¼ 1¼ 3 4 ½ ¾ ¾
AGDV6 1¼ 1¼ 3 4 ½ ¾ ¾
Table 1B: Dimensions and Connections
Advantage Gas Ratings
Boiler Model Input (MBH) DOE Heating Capacity (MBH) Net AHRI Rating Water (MBH) (1) AFUE (%)
AGDV3 60.8 52 45 85.5
AGDV4 91.2 78 68 85.4
AGDV5 121.6 104 90 85.3
AGDV6 152.0 130 113 85.2
(1) Net AHRI Water Ratings shown are based on a piping and pickup allowance of 1.15. Consult manufacturer before selecting
boiler for installations having unusual piping and pickup requirements, such as intermittent system operation, extensive piping
systems, etc.
The City of New York requires a Licensed Master Plumber supervise the installation of this product.
The Massachusetts Board of Plumbers and Gas Fitters has approved the Advantage DV™ Series Boiler. See the Massachusetts
Board of Plumbers and Gas Fitters website, http://license.reg.state.ma.us/pubLic/pl_products/pb_pre_form.asp for the latest
Approval Code or ask your local Sales Representative.
The Commonwealth of Massachusetts requires this product to be installed by a licensed Plumber or Gas tter.
TABLE OF CONTENTS
I. Pre-Installation....................................4
II. Unpack Boiler .....................................4
III. Water Piping and Trim ........................5
IV. Gas Piping...........................................8
V. Venting ................................................9
VI. Electrical............................................19
VII. System Start-up and Checkout ..........21
VIII. Operation..........................................24
IX. Service and Maintenance ...................26
X. Troubleshooting ................................29
XI. Repair Parts.......................................31
Electrical Requirements: 120VAC, 60 Hz, 1-ph, 15A
Maximum Allowable Working Pressure - 50 psi. Boiler shipped from factory with a 30 psi
relief valve.

3
Figure 1: Minimum Clearance to Combustible Materials

4
I. PRE-INSTALLATION
WARNING
Carefully read all instructions before installing
boiler. Failure to follow all instructions in proper
order can cause personal injury or death.
A. Inspect shipment carefully for any signs of damage.
All equipment is carefully manufactured, inspected
and packed. Our responsibility ceases upon delivery
of boiler to carrier in good condition. Any claim
for damage or shortage in shipment must be led
immediately against carrier by consignee. No claims
for variances or shortages will be allowed by Boiler
Manufacturer, unless presented within sixty (60) days
after receipt of equipment.
B. Installation must conform to the requirements of the
authority having jurisdiction. In the absence of such
requirements, installation must conform to National
Fuel Gas Code, ANSI Z223.1/NFPA 54. Where
required by the authority having jurisdiction, the
installation must conform to the Standard for Controls
and Safety Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1.
C. Appliance is design certied for installation on
combustible ooring. The boiler must not be installed
on carpeting.
D. Provide clearance between boiler jacket and
combustible material in accordance with local re
ordinance. Refer to Figure 1 for minimum clearance
from combustible material for closet installation.
Provide 1/2" clearance from water piping to
combustible materials.
E. Provide practical service clearances. A minimum
of 24" from the left side and front jacket panels is
recommended for servicing but may be reduced to
minimums shown in Figure 1.
F. Install on level oor. For basement installation provide
concrete base if oor is not level or if water may be
encountered on oor around boiler.
G. Protect gas ignition system components from water
(dripping, spraying, rain, etc.) during boiler operation
and service (circulator replacement, condensate trap,
control replacement, etc.).
H.Do not install boiler where gasoline or other
ammable vapors or liquids, or sources of
hydrocarbons (i.e. bleaches, cleaners, chemicals, sprays,
paint removers, fabric softeners, etc.) are used or stored.
II. UNPACK BOILER
CAUTION
Do not drop boiler. Do not bump boiler jacket
against oor.
A. Move boiler to approximate installed position.
B. Remove all crate fasteners.
C. Lift outside container and remove with all other
inside protective spacers and bracing. Save two of the
wooden slats from the container sleeve for use in Steps
E and F.
D. Remove all boiler hold-down fasteners.
E. Tilt the boiler to one side and slide a wooden slat under
the two raised feet.
F. Tilt the boiler to the other side and slide another
wooden slat under the two raised feet.
G. Slide the boiler forward or backward off the skid using
the two wooden slats as runners.
H. Move boiler to its permanent location.

5
III. WATER PIPING AND TRIM
WARNING
Failure to properly pipe boiler may result in
improper operation and damage to boiler or
building.
A. Design and install boiler and system piping to
prevent oxygen contamination of boiler water.
Oxygen contamination sources are system leaks
requiring addition of makeup water, ttings, and
oxygen permeable materials in distribution system.
Eliminate oxygen contamination by repairing system
leaks, repairing ttings, and using non-permeable
materials in distribution system.
B. Install circulator with anges, gaskets and bolts
provided.
C. Install Safety Relief Valve. See Figure 2. Safety Relief
Valve must be installed with spindle in vertical position.
WARNING
Safety relief valve discharge piping must be piped
near oor to eliminate potential of severe burns.
Do not pipe in any area where freezing could
occur. Do not install any shut-off valves.
D. Connect system supply and return piping to boiler.
Refer to Figures 2, 3, 4 and 5. Maintain minimum ½
inch clearance from hot water piping to combustible
materials.
E. If boiler is used in connection with refrigeration
systems, boiler must be installed with chilled medium
piped in parallel with the heating boiler using
appropriate valves to prevent chilled medium from
entering boiler. See Figure 3.
F. If boiler is connected to heating coils located in
air handling units where they may be exposed to
refrigerated air, boiler piping must be equipped with
ow control valves or other automatic means to prevent
gravity circulation of boiler water during operation of
cooling system.
G. Use a boiler bypass if the boiler is to be operated
in a system which has a large volume or excessive
radiation where low boiler water temperatures may be
encountered (i.e. converted gravity circulation system,
etc.).
Remove circulator and install pipe tee between
circulator and boiler return along with second tee in
supply piping as shown in Figures 4 and 5. Bypass
should be same size as the supply and return lines with
valves located in bypass and supply outlet as illustrated
in Figures 4 and 5 in order to regulate water ow to
maintain higher boiler water temperatures.
Set by-pass and boiler supply valves to half throttle
position to start. Operate boiler until system water
temperature reaches normal operating range.
Adjust valves to provide 180° to 200°F supply water
temperature. Opening the boiler supply valve will raise
system temperature, while opening by-pass valve will
lower system supply temperature.
H. If it is required to perform a long term pressure
test of the hydronic system, the boiler should rst be
isolated to avoid a pressure loss due to the escape of air
trapped in the boiler.
To perform a long term pressure test including the
boiler, ALL trapped air must rst be removed from the
boiler.
A loss of pressure during such a test, with no visible
water leakage, is an indication that the boiler contained
trapped air.
Figure 2: Near Boiler Piping Figure 3: Recommended Piping for Combination
Heating & Cooling (Refrigeration) Systems

6
Figure 4: Recommended Water Piping for Zone Valve Zoned Heating Systems
III. Water Piping and Trim(continued)

7
Figure 5: Recommended Water Piping for Circulator Zoned Heating Systems
III. Water Piping and Trim (continued)

8
A. Size gas piping. Design system to provide adequate gas
supply to boiler. Consider these factors:
1. Allowable pressure drop from point of delivery to
boiler. Maximum allowable system pressure is ½
psig. Actual point of delivery pressure may be less;
contact gas supplier for additional information.
Minimum gas valve inlet pressure is listed on rating
label.
2. Maximum gas demand. Consider existing and
expected future gas utilization equipment (i.e. water
heater, cooking equipment).
B. Connect boiler gas valve to gas supply system.
1. Use methods and materials in accordance with local
plumbing codes and requirements of gas supplier. In
absence of such requirements, follow National Fuel
Gas Code, ANSI Z223.1/NFPA 54.
2. Use thread (joint) compounds (pipe dope) resistant
to action of liqueed petroleum gas.
3. Install sediment trap, ground-joint union and manual
shut-off valve upstream of boiler gas control valve.
See Figure 6.
IV. GAS PIPING
Figure 6: Pilot and Gas Piping
4. All above ground gas piping upstream from manual
shut-off valve must be electrically continuous and
bonded to a grounding electrode. Do not use gas
piping as grounding electrode. Refer to National
Electrical Code, ANSI/NFPA 70.
C. Pressure test. The boiler and its gas connection must
be leak tested before placing boiler in operation.
1. Protect boiler gas control valve. For all testing over
½ psig, boiler and its individual shutoff valve must
be disconnected from gas supply piping. For testing
at ½ psig or less, isolate boiler from gas supply
piping by closing boiler's individual manual shutoff
valve.
2. Locate leaks using approved combustible gas
detector, soap and water, or similar nonammable
solution. Do not use matches, candles, open ames,
or other ignition source.

9
V. VENTING
Direct Vent “Direct vent” is also called “sealed combustion”. All combustion air is drawn from outside the building directly
into the boiler. The boiler vents vertically or horizontally, assisted by a fan in the boiler. Gas vent must resist temperature and


Power Vent
the boiler room without the use of a combustion air pipe.

operating under positive pressure.
A. General

When an existing boiler is removed from a common venting
system, the common venting system is likely to be too large
for proper venting of the appliances remaining to it.
At the time of removal of an existing boiler, the following
steps shall be followed 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:
1. Seal any unused openings in the common venting
system.
 
size and horizontal pitch and determine there is no
blockage or restriction, leakage, corrosion, and other

3. 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 clothes dryers and any appliance
not connected to the common venting system.
Turn on any exhaust fans, such as range hoods and

mum speed. Do not operate a summer exhaust fan.

 

Adjust thermostat so appliance will operate
continuously.
5. Test for spillage at the draft hood relief opening after

of a match or candle, or smoke from a cigarette,
cigar or pipe.
6. After it has been determined that each appliance
remaining connected to the common venting system
properly vents when tested as outlined above, return

any other gas burning appliance to their previous
conditions of use.
7. Any improper operation of the common venting
system should be corrected so the installation
conforms with the National Fuel Gas Code, ANSI
. 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
National Fuel Gas Code, ANSI

WARNING
Vent this boiler according to the instructions.
Failure to do so may cause products of
combustion to enter the building resulting in
severe property damage, personal injury or
death.
CAUTION
Install this boiler according to this manual and
the National Fuel Gas Code, ANSI Z223.1/NFPA
54, or applicable provisions of the local building
codes. Contact local building or re ofcials
about restrictions and installation inspection in
your area.
CAUTION
Failure to install a condensate drain line could
cause boiler to shutdown unexpectedly.

10
WARNING
Insufcient combustion air supply may result
in the production and release of deadly carbon
monoxide (CO) into the home.
Provide Combustion Air
Provide combustion and ventilation air in accordance
with the section "Air for Combustion and Ventilation," of
the National Fuel Gas Code, ANSI Z223.1/NFPA 54, or
applicable provisions of the local building codes.
Like all fuel-burning appliances, boilers need air to operate
reliably and safely.
1. If equipping for direct vent (sealed combustion),
provide combustion air according to Paragraph B —
Direct Vent.
2. If not equipping the Advantage DV for direct
vent, provide combustion air from the boiler room
according to Paragraph C — Combustion Air.
V. VENTING(continued)
WARNING
Do not use this boiler with galvanized, Type 304
or Type 316 stainless steel, non metallic or any
other non AL29-4C® based vent systems.
Installing Stainless Steel Vent
AL 29-4C® stainless steel vent systems resist the corrosive
effects of high temperature acidic ue gas condensate and
are leak-tight. Alternate stainless steel venting systems
require special adaptors to connect to the parts supplied
with the boiler. Obtain the adaptors from the supplier of the
alternate manufacturer’s venting system. Approved alternate
brands are:
(1) Heat-fab Inc – Saf-T- Vent
800-772-0739
(2) Flex –L International Inc. – Star 34
800- 561-1980
(3) Z-Flex U.S. Inc. – Z-Vent
800-654-5600
(4) Protech Systems, Inc. – FasNSeal
800-766-3473
1. Follow all general warnings and instructions for
Direct Vent systems described in the beginning of
this section. Start at the vent connector on the boiler
and work towards the vent terminal.
2. Select stainless steel vent components from Table 2.
3. Verify that the vent and air intake components
do not exceed the boiler’s maximum allowable
equivalent venting length, and do not fall below the
boiler’s minimum equivalent venting length, using
the worksheet on Page 13.
Table 2: Vent System and Air Intake
System Components
Vent System Component Part Number
3” Dia. Pipe x 1 Ft 8116296U
3” Dia. Pipe x 3 Ft 8116298U
3” Dia. Pipe x 5 Ft 8116300U
3” Dia. Pipe x Adjustable 8116319U
3” Dia. 90° Elbow 8116294U
3” Dia. 45° Elbow 8116292U
3” Dia. Horizontal Drain Tee 8116302U
3” Dia. Vertical Drain Tee 8116304U
3” Single Wall Thimble 8116116
3” Double Wall Thimble 103877-01
4. If a non-standard length is required, there are two
options:
a. Select adjustable length pipe from Table 2. The
pipe adjusts 7” from 12 ¾” to 19 ¾”. Or,
b. Cut the non-gasketed end of a standard straight
length. Make a square cut and le the end
smooth.
5. Remove dirt and grease from the male end of the
joint using an alcohol pad.
6. Align weld seams in pipes and use a slight twisting
motion to fully insert the male end into the female
end of the joint.
CAUTION
Do not dislodge, scratch or cut the factory gasket.
7. Tighten locking band by hand with a 5/16” nut driver,
plus ¼” turn past snug, ensuring that the locking band
fully captures the bead in the pipe.

11
V. VENTING(continued)
WARNING
DRAFT HOODS, VENT DAMPERS and other
obstructions or openings in the vent system are
prohibited.
DO NOT REDUCE THE DIAMETER of the vent
pipe.
MOISTURE AND ICE may collect around and
below the vent terminal. Keep the area in good
repair.
IF USING A CHIMNEY AS A CHASE for the vent,
do not vent any other appliance into the space
between the chimney wall and the vent.
ELIMINATE LOW SPOTS in the vent where ue
gas condensate may pool.
DO NOT PENETRATE VENT PIPE with holes or
fasteners.
B. Direct Vent
Planning a Direct Vent System
1. Avoid contact with plumbing or electrical wires.
2. Horizontal vent pipe must maintain a minimum ¼
inch per foot slope down towards boiler.
3. Any condensate forming in the vent will return to
the boiler. Provide for a condensate trap or siphon
near the boiler to remove condensate from the vent.
4. Support the piping to maintain vent location, prevent
sag and prevent accumulation of condensate. The
vent and/or air intake piping must be adequately
supported with straps or supports with a maximum
spacing of ve (5) feet on horizontal runs.
5. Adhere to the boiler’s maximum and minimum
allowable vent lengths. Vent length is provided
in terms of equivalent length of straight pipe plus
equivalent length of ttings, including both the vent
and the combustion air piping, but not including
vent or intake terminals.
6. Maintain minimum allowable clearances between
the vent pipe and combustible materials as
specied by the vent pipe supplier, this manual, and
applicable building codes.
7. Do not install venting system components on
the exterior of the building except as specically
required by these instructions.
8. Locate the vent terminal per these restrictions and
Figure 7:
a. Minimum twelve (12) inches above grade plus
normally expected snow accumulation level, or
seven (7) feet above grade, if located adjacent
to public walkway. Do not install over public
walkway where local experience indicates
appliance ue gas vapor or condensate creates a
nuisance or hazard.
b. Minimum three (3) feet above any forced air
intake located within ten (10) feet.
Exception: Combustion air intake of direct vent
system.
c. Minimum 4 ft. horizontally from, and in no case
above or below, unless a 4 ft. horizontal distance
is maintained, from electric meters, gas meters,
regulators and relief equipment.
d. Minimum twelve (12) inches from overhangs or
corners of buildings.
e. If window and/or air inlet is within four (4) feet
of an inside corner, then vent terminal must be
at least six (6) feet from adjoining wall of inside
corner.
f. Minimum one (1) foot below, one (1) foot
horizontally from, or one (1) foot above any
door, window, gravity air inlet, or other air
opening into building.
9. Locate the combustion air terminal on the same face
of the building as the vent termination to prevent
nuisance boiler shutdowns.
However, boiler may be installed with vertical
venting and sidewall combustion air inlet or
visa versa, if installation conditions do not allow
alternate arrangement.
10. If the vent passes through interior spaces in oors
above the boiler room, enclose the vent with
material having a re resistance rating at least
equal to the rating of the adjoining oor or ceiling.
Maintain minimum clearances to combustible
materials between the enclosure and the vent.
11. Use appropriate designed thimbles when passing
through combustible walls (thimble use is optional
for noncombustible walls). Ensure thimble is sealed
to prevent moisture from entering structure.
12. Protect building materials from degradation from
ue gases or ue gas condensate.

12
V. VENTING(continued)
Horizontal Stainless Steel Vent Installations
1. Install vent and intake piping per Figure 8.
2. Where the vent pipe penetrates any combustible
wall (Figure 9):
a. Insert the wall thimble from the outside of the
wall, and secure the outside ange to the wall
using nails or screws.
b. Seal any exterior openings in the wall thimble,
or between the thimble and the wall, using a
weatherproof sealant.
c. Install the inside thimble ange and secure the
ange to the inside wall using screws or nails.
3. Maintain 12" separation between vent and intake
terminals. Where the intake air pipe penetrates the
external wall, seal the opening with weatherproof
sealant (Figure 9).
4. To install a vertical “snorkel” exterior to the
building, refer to Figure 10 or 11.
Figure 7: Approved Terminal Locations
13. Vent-Air Intake system may be installed through
wall 3" - 24" thick.
Planning Vertical Installations —
1. Install re stop where vent and air intake passes
through oors, ceilings or framed walls. The re
stop must close the opening between the vent and/or
air intake pipe and the structure.
2. Size roof opening to allow easy insertion of vent
and air intake piping to allow proper installation of
ashing and storm collar to prevent moisture from
entering the structure
3. Use appropriately designed vent ashing
when passing through roofs. Follow ashing
manufacturers’instructions for procedures.
4. Ensure there is a weather-tight seal between the vent
and/or air intake piping were it penetrates the storm
collar and roof ashing.
5. Extend the vent and air intake pipe to maintain a
minimum vertical and horizontal distance of twelve
(12) inches from the roof surface. Allow additional
vertical distance for expected snow accumulation.
Brace as required.

13
V. VENTING(continued)
Combustion Air (PVC shown) Vent (stainless special gas vent)
90° elbow(s) PVC 90° elbow(s)
Quantity = x 5’ = equiv. ft. a. Quantity = x 5’ = equiv. ft. a.
45° elbow(s) PVC 45° elbow(s)
Quantity = x 2.5’ = equiv. ft. b. Quantity = x 5’ = equiv. ft. b
Straight pipe PVC Straight pipe
Length ft. = x 1 = equiv. ft. c. Length ft. = x 1 = equiv. ft. c.
Horizontal drain tee
Length ft. = x 2' = equiv. ft. d.
Vertical drain tee
Length ft. = x 7' = equiv. ft. e.
Total* a.+b.+c. = equiv. ft. Total* a.+b.+c.+d.+e.= equiv. ft.
* Total length cannot exceed 50 equivalent feet length (AGDV3 through AGDV6) .
Vent and combustion air terminals do not count towards total equiv. ft.
Vent/Combustion Air, Equivalent Length Work Sheet
This sheet is supplied to assist in vent/combustion air, equivalent length calculating
Figure 8: Separate Horizontal – Vent/Air Intake Installation

14
V. VENTING(continued)
Figure 9: Separate Horizontal Air Intake Terminal Installation
5. An optional concentric adapter kit (P/N 61106012) is
available for 3” & 4” stainless steel vents to provide
a single exterior wall penetration accommodating
both the intake and exhaust. Refer to the installation
instructions provided with the concentric adapter.
6. Install the intake air terminal supplied with the boiler
onto the outdoor end of the air intake pipe per the
instructions in this manual. See Figures 9 and 10.
7. Install the vent terminal supplied with the boiler onto
the outdoor end of the vent pipe per the boiler-specic
instructions in this manual. See Figures 9 and 10.
NOTICE
Storm collar, ashing and sealant for roof
penetration, and vertical vent tee for collection of
condensate are required for vertical venting and
are not supplied with the boiler.
Vertical Stainless Steel Vent Installations
1. Install vent and intake piping per Figures 11 thru 13.
2. Install the storm collar onto the vent pipe immediately
above the ashing.
3. Apply Dow Corning Silastic 732 RTV Sealant
between the vent pipe and the storm collar to provide
a watertight and heat-resistant seal.
4. Install the vent terminal per the boiler-specic
instructions in Figure 12 in this manual.
5. Install the air intake terminal per the boiler-specic
instructions in Figure 12 in this manual.
6. An optional concentric adapter kit (P/N 100222-01
(3”) is available to accommodate both intake and
exhaust piping in a single roof penetration. This
kit is compatible only with Saf-T Vent SC gas vent
produced by Heat-Fab. Refer to the installation
instructions included with the kit.

15
V. VENTING(continued)
Figure 10: Optional Separate Horizontal Vent
Terminal Installation
Figure 11: Typical Vertical Stainless Steel Venting

16
Figure 12: Vertical Vent/Air Termination Details for Stainless Steel Direct Vent
Extend Vent/Air Intake Piping to maintain minimum vertical (“X”) and minimum horizontal (“Y”) distance of twelve
(12) inches from roof surface. Allow additional vertical (“X”) distance for expected snow accumulation.
V. VENTING(continued)

17
Figure 13: Vertical Air Intake Piping for Direct Venting
V. VENTING(continued)
Some direct vent boilers are also approved with use of
indoor combustion air. If the boiler you are installing is
approved for use with indoor combustion air, install the vent
according to the instructions in Paragraph B, Direct Venting,
but omit the “optional” indoor air piping and components.
Specic instructions for conguring the boiler for indoor air
appear in the boiler-specic instructions at the front of this
manual.
Locate vent terminal at least 4 ft. below, 4 ft. horizontally
from, or 1 ft above any door, operable window, or gravity
air inlet. Locate at least 10 ft. horizontally from an operable
opening in an adjacent building.
WARNING
Provide enough air to ventilate the boiler room,
dilute the ue gases, and sustain combustion.
Ignition failure, overheating, re, carbon
monoxide, and spillage of ue gases may result
from poor air supply.
C. Power Vent
Combustion Air
If the boiler is a Direct Vent boiler and exchanges all
combustion air and combustion products directly with the
outdoors, there are no special requirements for providing
combustion, ventilation, and dilution air.
If the boiler is chimney vented, power vented or induced
draft and draws combustion air from within the building,
follow the steps below to determine how to provide air to
the boiler.
Is the boiler located in a conned space?:
1. Calculate the oorspace (in square feet) of the boiler
room and all rooms connected to the boiler room by
passageways not furnished with doors.
___________ oorspace (sq. ft.)
2. Add up the input rates of all the combustion
appliances installed in the same oorspace.
combined appliance
___________ input (BTU/hr)
3. In the table below, nd the Minimum Allowable
Floorspace based on the Combined Input Rate from
Step 2 and the ceiling height. If the Combined Input
Rate is between two rates, use the next highest rate.
minimum allowable
___________ oorspace (sq. ft.)
4. If the Floorspace from Step 1 is less than the
Minimum Floorspace from Step 3, then you must
provide outdoor air to the boiler room. Proceed to
Step 6.
Is the boiler located in a building of unusually tight
construction?
5. If the answer to all of the three questions below
is “yes”, then you must provide outdoor air to the
boiler room.
Minimum Allowable Floorspace in the Boiler Room
and Freely Connected Rooms (sq. ft.)
Ceiling Height
7’ 8’ 9’ 10’
Combined
Appliance
Input Rate
(see Step 2)
(BTU/hr)
50,000 357 313 278 250
100,000 714 625 556 500
150,000 1071 938 833 750
200,000 1429 1250 1111 1000
250,000 1786 1563 1389 1250
300,000 2143 1875 1667 1500
350,000 2500 2188 1944 1750
400,000 2857 2500 2222 2000

18
Do the walls and ceilings exposed to the outside
atmosphere have a continuous water vapor retarder
with a rating of 1 perm or less, with openings gasket
or sealed?
Yes No
Are operable windows and doors weatherstripped?
Yes No
Are exterior wall joints caulked or sealed?
Yes No
6. If you must provide outdoor air to the boiler room,
the top of the permanent opening into the boiler
room must be within 12” of the ceiling, and the free
area of the opening (sq. in.) must be no less than the
Combined Appliance Input (from Step 2) divided by
3000 BTU/hr/sq. in.
combined appliance
__________ input (Step 2)
÷3000 BTU/hr/sq. in.
Minimum Opening Size
_____ (sq. in.)
V. VENTING(continued)
For more details and options, refer to the National Fuel Gas
Code (ANSI Z223.1/NFPA 54), or applicable provisions of
local building codes.
7. Duct this opening vertically or horizontally
directly to the outdoors, or directly to a space that
communicates directly with the outdoors, such as an
attic or crawlspace.

19
VI. ELECTRICAL
D. For installations using zone valves provide separate
transformer for zone valve wiring. Consult zone valve
manufacturer for assistance.
CAUTION
This boiler contains controls which may cause
the boiler to shut down and not restart without
service. If damage due to frozen pipes is a
possibility, the heating system should not be
left unattended in cold weather; or appropriate
safeguards and alarms should be installed on the
heating system to prevent damage if the boiler is
inoperative.
Figure 14: Wiring Connection Diagram
A. General. Install wiring and electrically bond boiler to
ground in accordance with requirements of authority
having jurisdiction, or in absence of such requirements,
with the National Electrical Code, ANSI/NFPA 70.
B. Install thermostat. Locate on inside wall
approximately 4 feet above oor. Do not install on
outside wall, near replace, or where inuenced by
drafts or restricted air ow, hot or cold water pipes,
lighting xtures, television, or sunlight. Allow free air
movement by avoiding placement of furniture near
thermostat.
C. Wire boiler. Boiler is rated for 120 VAC, 60 hertz,
less than 15 amperes. A separate electrical circuit
must be run from the main electrical service with an
over-current device/disconnect in the circuit. A service
switch is recommended and may be required by some
local jurisdictions. Connect to black and white wires
and green ground screw. See Figures 14 and 15.

20 Figure 15: Schematic Ladder Diagram
VI. Electrical (continued)