Page 1
GAS-FIRED CAST-IRON BOILERS FOR NATURAL AND L.P. PROPANE GASES
®
“S” AND “SX” MODELS
HOT WATER MODELS S-34 THROUGH S-150
SENTRY
and SX-150 THROUGH SX-210
INSTALLATION AND OPERATING INSTRUCTIONS
CONTENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PAGE
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,3
Installation Requirements:
Boiler Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Boiler Foundation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Chimney Requirements . . . . . . . . . . . . . . . . . . . . . . . . 4
Minimum Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Draft Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Vent Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Vent Damper Installation . . . . . . . . . . . . . . . . . . . . 5,6,7
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical Controls and Wiring . . . . . . . . . . . . . . . . . . . 8
Boiler Room Air Supply and Ventilation . . . . . . . . . . . . 8
Water Piping at Boiler . . . . . . . . . . . . . . . . . . . . . . . . . 8
Operating Instructions:
Filling and Venting Water Systems. . . . . . . . . . . . . . . . 8
Initial Start, Safety and Lighting Instructions . . . . . 9,10
Burner Adjustment, Checking Gas Input . . . . . . . 10,11
Care and Maintenance
General Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . 11
Water Level Check. . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Annual Inspection and Cleaning . . . . . . . . . . . . . . . . 12
Safety Check for Control Systems . . . . . . . . . . . . . . . 12
Protection from Freezing/Water Treatment. . . . . . . . . 12
Keeping Area Clear . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Sequence of Operations . . . . . . . . . . . . . . . . . . . . . . . . . 13
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14,15
Pump or Valve Zoning of Water Boilers . . . . . . . . . . . . . 16
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Piping a Heating-Cooling System . . . . . . . . . . . . . . . . . . 18
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Appendix A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
READ ALL OF THE FOLLOWING WARNINGS AND
STATEMENTS BEFORE READING THE
INSTALLATION INSTRUCTIONS
LIQUEFIED PETROLEUM (L.P.)
PROPANE GAS-FIRED BOILERS
Installation location ONLY as permitted in paragraph entitled "LIQUEFIED PETROLEUM (L.P.) PROPANE GASFIRED BOILER LOCATION" on page 4 of this instruction
book.
The above warning does not apply to
fired boilers.
The installation must conform to the requirements of the
authority having jurisdiction or, in the absence of such
requirements, to the National Fuel Gas Code, ANSI
Z223.1-latest edition. The installation must also conform
to the additional requirements in this Slant/Fin Instruction
Book.
In addition, 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, No. CSD-1. If there
is any conflict in the above requirements, then the more
stringent requirement will apply.
This manual must be left with owner and should be hung
on or adjacent to the boiler for reference.
This boiler, gas piping and accessories must be installed,
connected, serviced and repaired by a trained, experienced service technician, familiar with all precautions
required for gas-fired equipment and licensed otherwise
qualified, in compliance with the authority having jurisdiction.
IMPORTANT
WARNING
NATURAL gas-
WARNING
Heating Contractor
Address
Phone Number
Printed in U.S.A. 605 PUBLICATION S-40
Part No. 46-0528 Rev. N
Boiler Model Number
Boiler Serial Number
Installation Date
Page 2
2
Sentry
Page 3
Sentry
3
Boiler
Model
No. of
Sect.
S-34 2 8
S-60 3 11
S-90 4 14
S-120 5 17
S-150 6 20
SX-150 6 20
SX-180 7 23
SX-210 8 26
Boiler
Model
S-34
S-60 thru S-150 and
SX-150 thru SX-210
Dimensions
(inches)
A B C D E FG
1
⁄8"145⁄8" 4 33" — — 61⁄4" 190
1
⁄8"175⁄8" 4 37" 41⁄2"26"6
1
⁄8"205⁄8" 5 37" 51⁄2"251⁄2"61⁄4" 310
1
⁄8"235⁄8" 6 37" 71⁄2"25"6
1
⁄8"265⁄8" 7 37" 81⁄2"241⁄2"81⁄4" 425
1
⁄8"265⁄8"6511⁄2"101⁄2"107⁄8"61⁄4" 425
1
⁄8"295⁄8"7523⁄4" 12" 107⁄8"81⁄4" 485
1
⁄8"325⁄8"7523⁄4"131⁄2"107⁄8"81⁄4" 545
Orifice Sizes for High Altitudes
Includes 4% Reduction for Each 1000 Feet
Gas
Type
Orifice
Size for
Sea
Level
2000 3000 4000 5000 6000
(max)
Elevation - Feet
Approx.
Total Wt.
Full of
Water (lb.)
1
⁄4" 250
1
⁄4" 365
7000 8000 9000 10000
CHIMNEY RECOMMENDATIONS
HEIGHT:15 ft. (minimum) from draft
hood skirt to top of chimney.
INSIDE DIAMETER: Same as dimension C (or larger).
NOTE: Larger chimney may be
required if two or more boilers or a boiler and another appliance are vented to
a single chimney.
Slant/Fin supplies vent dampers by
several manufacturers. Some are
smaller than the indicated “G maximum”.
Natural 47 48 48 49 49 49 50 50 51 51
Propane 56 56 56 57 57 57 58 59 59 60
Natural 50 51 51 51 51 52 52 52 53 53
Propane 57 58 59 59 60 60 61 62 63 63
Orifice indicated for sea level above are factory installed in boiler unless otherwise specified by the local authority.
See III page 10 f
Base Assembly
Sentry Boiler
or burner input adjustment.
INSTALLATION REQUIREMENTS
The installation must conform to the requirements of the authority
having jurisdiction or, in the absence of such requirements, to the
National Fuel Gas Code, ANSI Z223.1-latest edition.
This installation must also conform to the additional requirements
in this Slant/Fin Instruction Book.
Burners
NATURAL GAS-FIRED BOILER LOCATION
Pilot
Burner
Access
Door
Gas Valve
Provide a level, solid foundation for the boiler. Location should be
as near as possible to chimney or outside wall so that the flue pipe
from boiler is short and direct.
The location should also be such that the gas ignition system components are protected from water (dripping, spraying, rain, etc.)
during appliance operation and service (circulator replacement,
condensate trap, control replacement, etc.).
BOILER FOUNDATION
A. Provide a solid, level foundation, capable of supporting the
weight of the boiler filled with water, and extending at least 2"
past the jacket on all sides. See dimensions of boiler, page 2.
B. For installation on non-combustible floors only. The
Combustible Floor Kit part number printed on the boiler rating
plate is the only one to be used when installing on combustible
floors. The boiler must not be installed on carpeting.
C. If boiler is to be located over buried conduit containing electric
wires or telephone cables, consult local codes or the National
Board of Fire Underwriters for specific requirements.
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4
Sentry
W
ARNING
LIQUEFIED PETROLEUM (L.P.) PROPANE
GAS-FIRED BOILER LOCATION
REQUIRES SPECIAL ATTENTION
Liquefied Petroleum (L.P.) propane gas is
heavier than air.
Therefore, propane boilers, piping, valves should not be
i
nstalled in locations where propane leaking from defective
equipment and piping will “pool” in a basement or other space
below the leak.
A
spark or flame from the boiler or other source may ignite
the accumulated propane gas causing an explosion or fire.
Provide a level, solid foundation for the boiler.Location should
be as near the chimney as possible so that the flue pipe from
boiler to chimney is short and direct.
T
he UNIFORM MECHANICAL CODE may be in effect in
your geographic area
The following precautions are cited by the 1994 UNIFORM
MECHANICAL CODE, section 304.6:
“LPG Appliances. Liquefied petroleum gas-burning
appliances shall not be installed in a pit, basement or similar location where heavier-than-air-gas might collect.
Appliances so fueled shall not be installed in an abovegrade under-floor space or basement unless such location is provided with an approved means for removal of
unburned gas.”
Consult Chapter 5 of the 1994 UNIFORM MECHANICAL
CODE for design criteria of the “approved” means for removal
of unburned gas.
CHIMNEY REQUIREMENTS
A. Sentry boilers may be vented into a masonry vitreous tile-
lined chimney or type “B” venting system NOT EXPOSED to
the OUTDOORS below the roof line.
Venting and sizing of venting system must be in accordance
with Part 7, Part 10 and Appendix G of the National Fuel
Gas Code ANSI Z223.1, NFPA 54, -latest edition which will
be referred to as the National Fuel Gas Code. Local codes
apply.
If a masonry chimney is exposed to the outdoors on one or
more sides below the roof line (exterior chimney), ONE of
the following options apply:
1. Chimney must be re-lined with a metallic liner. When this
is done, the chimney will be considered NOT exposed to
the outdoors and the requirements of the National Fuel
Gas Code for NON-exposed chimneys and/or local codes
will apply.
2. If an exposed tile-lined chimney is to be used WITHOUT
a metallic liner, the boiler must first meet the requirements of the following tables and paragraphs of the
National Fuel Gas Code:
I. For Single Sentry Boiler - Paragraph 10.1.9 and
table 10.11.
II. For multiple appliances - Paragraph 10.2.18 and table
10.12 (or 10.13 if applicable).
In addition, all requirements of Part 7, Part 10 and
Appendix G of the National Fuel Gas Code and/or local
codes apply.
B. If an existing boiler is removed from a common venting
system, the common venting system may be too large
for proper venting of the remaining appliances connected to
the common vent. Follow the test procedure shown in
Appendix “A” on page 19 of this manual to insure proper
operation of venting system and appliances.
C. Inspect for proper and tight construction. Any restrictions or
obstructions must be removed. An existing chimney may
require cleaning.
D. Chimney or vent must extend at least 3 feet above any
ridge within 10 feet of the chimney.
MINIMUM CLEARANCES FROM COMBUSTIBLE
C
ONSTRUCTIONS
SENTRY SERIES
MINIMUM CLEARANCE FOR COMBUSTIBLE CONSTRUCT
ION. MINIMUM ALCOVE AND CLOSET CLEARANCE.
S-34 through SX-150 through
S-150
SX-210
Front 6" 6"
Rear 6" 6"
Left Side 6" 6"
Right Side 12" 12"
Top (above boiler) 12" 28"
Flue Connector 6" 6"
A. Minimum boiler clearances shall be as follows:
B. Provide accessibility clearance of 24” on sides requiring
servicing and 18” on sides used for passage.
C. All minimum clearances shown above must be met. This
may result in increased values of some minimum clearances
in order to maintain the minimum clearances of others.
D. Clearance from hot water pipes shall be 1 inch**.
** At points where hot water pipes emerge from a floor wall or ceiling, the
clearance at the opening through the finished floor, wall or ceiling boards
may not be less than 1/2 inch. Each such opening shall be covered with
a plate of non-comb
ustib
le mater
ial.
SAFETY—
KEEP THE BOILER AREA CLEAR AND FREE FROM
COMBUSTIBLE MATERIALS, GASOLINE AND OTHER
FLAMMABLE VAPORS AND LIQUIDS.
DRAFT HOOD—
The draft hood supplied with SX-150 through SX-210 models is
part of the listed boiler assembly. DO NOT alter the hood. See
dimensions, page 2.
Attach the hood to the boiler flue outlet. Connect flue pipe full
size of hood outlet. Vent damper must be installed on the outlet
side of the hood. See Vent Piping, below.
VENT PIPING—
A. Vent piping installation must be in accordance with ANSI
Z223.1-latest edition, National Fuel Gas Code, Part 7,
Venting of Equipment. Other local codes may also apply and
must be followed.
B. Boiler vent pipe must be the full diameter of the boiler outlet.
See dimensions, page 2.
C. If more than one appliance vents into a common breeching,
the area of the breeching must be equal to the area of the
largest vent plus 50% of the area of the additional vent
areas. Vent connectors serving appliances vented by natural draft shall not be connected into any portion of mechanical draft systems operating under positive pressure.
Horizontal breeching or vent pipe should be as high as possible, consistent with codes, so that vertical vents from appliances will have a high rise above draft diverter openings. All
horizontal runs must slope upwards not less than 1/4 inch
per foot of run. Horizontal portions of the venting system
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Sentry
5
must be supported to prevent sagging by securing each joint
with metal screws and by providing hanger spaced no
greater than 5 feet apart.
D. Vent or breeching into chimney should not be inserted past
the inside wall of the chimney liner.
E. All venting means should be inspected frequently. See Care
and Maintenance and separate User's Information Manual.
V
ENT DAMPER INSTALLATION
The vent damper referred to in the following instructions is
the Slant/Fin Corporation vent damper.
This device is design certified by A.G.A. for use ONLY on specific Slant/Fin Corp. gas boiler models. These boilers must also
be equipped with a plate which states that the boiler may be
used with a Slant/Fin Corp. automatic vent damper device and
indicates the proper vent damper model number. This device
cannot be used with millivolt ignition system.
A. INSTALLATION INSTRUCTIONS BEFORE YOU START TO
INSTALL
1. Read this installation manual, the "DANGER" plate
attached to the top of the boiler, the "WARNING" on the
wiring diagrams, vent damper carton and operator cover.
2. Perform pre-installation inspection as required by ANSI
specification Z21.66. (See Vent Damper Instructions.)
3. Select a proper, convenient location for vent damper.Vent
damper may be installed vertical or horizontal on all models (see figures 1, 2 and 3).
4. Carefully unpack the unit. DO NOT FORCE IT OPEN OR
CLOSED. Forcing the damper may damage the gear
train and void the warranty.
Figure 2. Vertical Installation of Vent Damper on Sentry “S”
Boilers
Figure 1. Vertical Installation of Vent Damper on
Sentr
y “SX” Boilers
Figure 3.
Horizontal or Sloping Installation of Vent Damper
Page 6
6
Figure 4.
TABLE
Vent
ize 4" 5" 6" 7" 8"
S
5
A9
⁄16"105⁄16"115⁄16"125⁄16"135⁄16"
Sentry
Figure 8. Damper Vane
Figure 5. Vent Damper Dimensions
Figure 9.
WARNING—DANGER
Once you have begun vent damper installation procedure, DO
NOT restore electric power and gas supply until installation
and inspection ha
ve been completed (in order to prevent the
main burners from operating). DO NOT operate the boiler until
the vent damper harness "RECEPTACLE B" is plugged into
"MALE PLUG" (as described in the installation instructions),
and the vent damper installation and checkout procedures
have been completed. Failure to observe this warning may
create a hazardous condition that could cause an explosion or
carbon monoxide poisoning.
Figure 6. Connecting “RECEPTACLE B” to “MALE PLUG” inside
L8148E Aquastat Box for Sentry Packaged “S” and
“SX” boilers.
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Sentry
7
B. 1. This device must be installed after the boiler draft hood
(
between the draft hood outlet and the connector to the outdoor chimney or vent) as close to the draft hood as practicable, and without modification of the draft hood or the vent
damper. (See figures 1, 2 and 3.)
2. The inlet size of the vent damper must be the same nominal trade size as the outlet of the draft hood.
3. This device must be located in a venting system or section
of a venting system so that it serves only the single applia
nce for which it is installed. (See figure 4.)
4. Clearances of not less than 6 inches (152MM) must be
maintained from combustible materials, with provisions for
s
ervice access.
C. NOW, PROCEED AS FOLLOWS:
Remove the cover from the aquastat control. Note the Molex
connector (MALE PLUG) inside the control box (see figure 6).
Remove knockout in the control housing marked for vent
damper, pass “Receptacle B” of vent damper harness through
the knockout and attach the flexible metallic connector to the
control housing with the nut. Join the two halves of the Molex
connector (MALE PLUG AND RECEPTACLE B). Replace the
control cover. Attach the other side of vent damper harness to
vent damper operator (if not attached) and connect Molex connector to operator receptacle. (See figures 1 and 2.)
D. AFTER INSTALLATION:
1. Operate system through two complete cycles to check for
opening and closing in proper sequence, and proper burner operation. DAMPER MUST BE IN OPEN POSITION
WHEN BOILER MAIN BURNERS ARE OPERATING.
2. Perform installation checks as required by ANSI specification Z21.66. (See Vent Damper Instructions.)
3. Check the troubleshooting section if problems arise with the
installation.
E. THERMOSTAT HEAT ANTICIPATOR ADJUSTMENTS
If the 24V room thermostat that controls this boiler has an
adjustable heat anticipator and has previously been adjusted
without a vent damper, then see publication VD-40 for correct
electrical requirement adder for the vent damper used. If room
thermostat has not been adjusted, connect entire system to
thermostat and run the system while measuring the current
drawn through the thermostat wires. Set the heat anticipator
at the value of current measured. For more information, see
Slant/Fin vent damper installation manual, pub.VD-40, and the
manufacturer's vent damper booklet shipped with the vent
damper.
GAS PIPING—
A. Local installation codes apply. The pipe joint compound used
on threads must be resistant to the action of liquefied petroleum gases.
B. The gas supply line to the boiler should be run directly from
the meter for natural gas or from the fuel tank for L.P.
propane gas. See page 2 for location of union and manual
main shutoff valve that may be specified locally.
Selecting pipe size for natural gas:
1. Measure or estimate the length of piping from the meter
to the installation site.
2. Consult gas supplier for heating value of gas (Btu/cu. ft.).
3. Divide boiler rated input by heating value to find gas flow
in piping (cu. ft. per hour).
4. Use table A to select proper pipe size.
Example
: Boiler model S-150 is to be installed. Distance
from gas meter to the boiler is 30 ft. Heating value of natural gas is 1020 Btu/cu. ft. Select proper pipe size.
Gas flow = 150,000 Btu/hour = 147 cu. ft. per hour
1020 Btu/cu.ft.
At 30 ft. length of pipe, match required capacity from Table A
(choose higher capacity, in this case is 152 cu. ft. per hour).
Required pipe size is 3/4".
Improper gas pipe sizing will result in pilot flame outages,
i
nsufficient heat and other installation difficulties. For more
i
nformation and also if other appliances are to be attached
to the piping system, see Appendix C of National Fuel Gas
Code ANSI Z223.1-latest edition.
C. The boiler and its gas connection must be leak tested before
placing the boiler in operation. Use liquid soap solution for
all gas leak testing. DO NOT use open flame.
This boiler and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2
PSIG.
This boiler must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any
pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 PSIG.
D. All gas piping used should be inspected thoroughly for
cleanliness before makeup. A sediment trap must be provided, as illustrated on page 2.
E. The minimum and maximum gas supply pressure (at the
inlet of gas valve) are shown on the boiler rating plate for the
type of gas used. Gas supply pressure should never be less
than minimum or more than maximum pressure when the
boiler or any other appliance is turned on or off.
Length
of Pipe
in Feet
10
20 92 190 350 730 1100
30 73 152 285 590 890
40 63 130 245 500 760
50 56 115 215 440 670
60 50 105 195 400 610
70 46 96 180 370 560
80 43 90 170 350 530
90 40 84 160 320 490
100 38 79 150 305 460
At pressure drop of 0.3 in. water, specific gravity = 0.60.
1/2 3/4 1 1-1/4 1-1/2
132 278 520 1050 1600
Gas Flow In Piping --
cu. ft. per hr.
Iron Pipe Size (IPS)—inches
ELECTRICAL CONTROLS AND WIRING—
A. The electrical power to the boiler must be on a separately
fused and live circuit.
B. If an external electrical source is utilized, the boiler, when
installed, must be electrically grounded in accordance with
the requirements of the authority having jurisdiction or, in
absence of such requirements, with the National Electrical
Code, ANSI/NFPA No. 70-latest edition.
C. Basic control wiring diagrams are given on pages 14 and 15.
Other control systems may be factory supplied, see User's
Information Manual and Instructions packed with control
system supplied.
D. After placing the boiler in operation, the safety shutoff device
must be tested. See page 12 safety check.
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8
BOILER ROOM AIR SUPPLY AND VENTILATION
An ample supply of air is required to obtain combustion and
ventilation. ALL AIR COMES FROM OUTSIDE, directly through
wall openings to the boiler or through unsealed openings
around windows, doors, etc. in the whole building. When buildings are insulated, caulked and weather stripped, now or later
on, direct openings to outside may be required and should be
p
rovided. If the boiler is not near an outside wall, air may be
d
ucted to it from outside wall openings.
Provisions for combustion and ventilation air must be made in
accordance with section 5.3, Air for Combustion and
Ventilation, of the National Fuel Gas Code, ANSI Z223.1-latest
edition, or applicable provisions of the local building codes. The
following recommendation applies to buildings of energy-saving
construction, fully caulked and weather stripped:
Provide one GRILLED opening near the floor and one near the
ceiling on an outside wall near the boiler (or duct from such
openings to the boiler), EACH opening to be a minimum of one
square inch per 2000 Btuh input to ALL APPLIANCES in the
area. For a total appliance input of 200,000 Btuh, each opening will be 100 square inches. A grilled opening 10"X10" has
100 square inches of area. If fly screen must be used over
openings, double the area and inspect and clean the screen
frequently.
Openings must never be reduced or closed. If doors or windows are used for air supply, they must be locked open.
Protect against closure of openings by snow and debris.
Inspect frequently.
No mechanical draft exhaust or supply fans are to be used in or
near the boiler area.
The flow of combustion and ventilating air to the boiler must not
be obstructed.
WATER PIPING
I. CIRCULATING SYSTEMS
A. Packaged water boilers are equipped with a water circu-
lating pump, mounted to return the water into the boiler.
For some installations, the pump should be on
the supply main. See figure 10.
II. AIR CONTROL SYSTEM
A. DIAPHRAGM-TYPE COMPRESSION TANKS are used
to control system pressure in an AIR ELIMINATING SYSTEM: an automatic air vent is used to REMOVE air from
the system water. See figure 10. If system pressure
needs further control, add an additional tank or install a
larger capacity tank. Locate the tank near the boiler, as
illustrated.An automatic air vent should be installed in the
top of the boiler or air purger. See figure 10.
B. PUMP LOCATION — Locating low-head pump(s) on
return to boiler is acceptable for smaller boiler sizes in
residences of one or tw
location shown in illustration is required in large, multistory building installations, especially when high-head
pumps are used. The compression tank must be at the
boiler or between boiler and supply main pump(s).
IMPOR
TANT: Hot water heating systems containing high
water volume, such as would occur with cast-iron radiation, require special care with air elimination.
The circulator pump should be located on the boiler supply pipe and the expansion tank and air scoop should be
located near the pump suction.
C. On a hot water boiler installed above radiation level, the
boiler must be provided with a low water cutoff device at
the time of installation by the installer.
o stories. The alternate pump
Sentry
Figure 10. Piping Arrangement
D. Radiant floor and low water temperature systems:
A boiler by pass loop, three way valve arrangement, or primary secondary pumping (with a boiler loop) must be used to provide a minimum 130˚F return water temperature to the boiler.
This will prevent condensation on the cast iron sections that
can result in improper operation of the boiler.
OPERATING INSTRUCTIONS
I. FILLING AND VENTING WATER SYSTEMS
A. Fill the system with water. Vent or purge off air.
B. Fire the boiler as soon as possible (see following warning
and instructions) and bring water temperature to at least
180 degrees, while circulating water in the system.
C. Vent air and add water as needed to achieve operating
pressure on boiler gauge. Pressure must be between
approximately 12 psi (cold water) and 25 psi (at water temperature setting of high limit control), for boilers equipped
with 30 psi relief valves. Boilers rated for a higher pressure
and equipped with a matching relief valve may operate at a
higher pressure, but no higher than 5 psi below the relief
valve opening pressure.
D. Check for and repair any leaks before placing system in
service.
Before firing boiler, make these checks:
1. System is full of water. Air is vented or purged.
2. Relief valve is installed in accordance with the ASME Boiler
Pressure Vessel Code, Section IV. Valve opening is not
closed or reduced in size.
3. Venting is installed according to instructions under “VENT
PIPING”.
4. All wiring is completed, following applicable wiring diagrams.
Page 9
Sentry
9
5. Using soap solution, check for gas leaks in all gas piping
from meter to boiler pilot and manifold. DO NOT use
open flame.
II. INITIAL START
Safe lighting and other performance criteria were met when
testing various gas manifold and control assemblies used on
t
he Sentry Series Boilers under the ANSI-Z21.13-1991
S
tandard.
INSTRUCTIONS
Follow the lighting instructions in this manual that apply to
the particular ignition system equipped on this boiler. (Also,
see figures on page 2 for location of gas manifold, gas valve
and control assembly.) These instructions are also attached
to the boiler.
1. Continuous Burning Pilot (24V).
FOR BOILERS EQUIPPED WITH HONEYWELL GAS
VALVE VR8200 or VR8300 (see figures 11 and 12).
SAFETY INFORMATION
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.
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 instructions.
• 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.
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 underwater.
8. Find pilot—follow metal tube from gas control. The pilot is
between two burner tubes behind the burner access panel.
9. Turn knob on gas control counterclockwise
t
o "PILOT".
Figure 11. Valve VR8200 or VR8300
10. Push in red button all the way and hold in. Immediately
light the pilot with a match. Continue to hold the red button
in for about one (1) minute after the pilot is lit. Release
knob and it will pop back up. Pilot should remain lit. If it
goes out, repeat steps 5 through 10.
- If knob does not pop up when released, stop and imme-
diately 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.
12. Turn gas control knob counterclockwise to "ON".
13. Replace control access panel.
14. Turn on all electric power to the appliance.
15. Set thermostat to desired settings.
To Turn Off Gas To Appliance
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance if service is to be
performed.
3. Remove control access panel.
4. Turn gas control knob clockwise to "OFF".
DO NOT force.
5. Replace control access panel.
Lighting Instructions
1. STOP! Read the safety information above on this page.
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the appliance.
4. Remove control access panel.
5. Push in gas control knob slightly and turn clockwise
to "OFF".
6. Wait five (5) minutes (longer for propane) to clear out any
gas, then smell for gas, including near the floor. If you then
smell gas,
this page. If you don't smell gas, go to next step.
7. Remove the pilot access panel located
below and behind the gas control unit.
STOP! Follow "B" in the safety information on
Figure 12.
Page 10
10
2. Intermittent Pilot System (IID).
FOR BOILERS EQUIPPED WITH HONEYWELL GAS
VALVE VR8204 OR VR8304 (see figures 13 and 14).
SAFETY INFORMATION
FOR YOUR SAFETY READ BEFORE OPERATING
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 is equipped with an ignition device which
a
utomatically lights the pilot. DO NOT try to light the pilot
by hand.
B. BEFORE OPERATING smell all around the appliance area
f
or 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 instructions.
• 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.
D. DO NOT use this appliance if any part has been underwa-
ter. 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 underwater.
Operating Instructions
1. STOP! Read the safety information above.
2. Set the thermostat to lowest setting.
3. Turn off all electric power to the appliance.
4. This appliance is equipped with an ignition device which
automatically lights the pilot. DO NOT try to light the pilot
by hand.
5. Remove control access panel.
6. Turn gas control knob clockwise till knob stops then
continue to "OFF". DO NOT force.
7. Wait five (5) minutes (longer for propane) to clear out any
gas, then smell for gas, including near the floor. If you then
smell gas,
above on this page. If you don't smell gas, go to next step.
8. Turn gas control knob counterclockwise to "ON".
9. Replace control access panel.
10. Turn on all electric power to the appliance.
11. Set thermostat to desired setting.
12. If the appliance will not operate, follow the instructions "To
Turn Off Gas To Appliance" and call your service technician or gas supplier.
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance if service is to
be performed.
3. Remove control access panel.
4. Turn gas control knob clockwise till knob stops,
then continue to "OFF". DO NOT force.
5. Replace control access panel.
STOP! Follow "B" in the safety information
To Turn Off Gas To Appliance
Sentry
Figure 13. Valve VR8204 or VR8304
Figure 14.
III. BURNER ADJUSTMENT
A. Adjust gas input rate:
1. Consult gas supplier for higher* heating value of gas.
(Btu/cu.ft.)
2. Set thermostat high enough so that boiler will remain on
while checking rate.
3. Measure manifold pressure at 1/8" tapping. Correct manifold pressure for gas used is printed on boiler rating
plate. NOTE: Gas pressure may be adjusted by turning
pressure regulator screw on combination gas valve (turn
clockwise to increase pressure, counterclockwise to
decrease pressure).
a. Input for PROPANE is approximately at rating shown
on rating plate when manifold pressure is 9-1/2" water
column.
b. Input for NATURAL GAS is approximately at rating
when manifold pressure is 3-1/2" water column, but
should be checked on the gas meter:
Btuh Input = Btu/cu. ft. x cu. ft. metered
in 3 minutes x 20
Example #1:
For 1000 Btu/cu.ft. gas, this becomes:
Btuh Input = cu. ft. metered in 3 minutes
x 1000 Btu/cu.ft. x 20
Example #2
For 1050 Btu/cu.ft. gas, this becomes:
Btuh Input = cu. ft. metered in 3 minutes
4. The higher* heating v
different localities. Consult with Slant/Fin’s Technical
Service Dept. for re-orificing procedures if any of the following apply:
:
x 1050 Btu/cu.ft. x 20
alue of gas varies substantially f
or
Page 11
Sentry
11
a. Boiler (burner) is overfiring. CAUTION! National Fuel
Gas Code ANSI Z223.1-latest edition, does NOT permit firing at a higher input rate than the input rate indicated on the boiler rating plate in order to avoid hazardous conditions such as explosion or carbon
monoxide poisoning.
b. Poor higher* heating value of gas is causing the actu-
a
l input to be substantially lower than the rating plate
i
ndication.
* “Higher heating value” of gas is commonly known as a “heating value.”
GAS RATE TABLE
The gas metered in 3 minutes to obtain rated input for each
boiler model, using 1000 Btu/cu. ft. gas, is tabulated in gas rate
table.
Boiler rated input in
cu.
ft./hr. of 1000 Btu/cu. ft.
Natural Gas
Cubic Feet
Gas Consumption
1000 Btu/cu. ft. gas, in 3
minutes, at rated input
34 1.70
60 3.00
90 4.50
120 6.00
150 7.50
180 9.00
210 10.50
2. Safety Shutdown Checkout
a. For proper operation the pilot should engulf the thermo-
couple or flame sensor as shown below.
b. To adjust pilot, turn pilot flow adjustment screw on valve
clockwise or counterclockwise to give a steady flame
enveloping 3/8 to 1/2 inch of the tip of the thermocouple
or flame sensor. Note that turning the pilot adjust screw
c
lockwise will decrease the pilot flame.
c
. Check safety shutdown of gas valve by following procedure
outlined "CARE" and "MAINTENANCE" section.
Figure 15.
B. Main Burners
1. Fire the boiler continuously for at least 15 minutes, to reach
burner operating temperature.
2. Observe the flames, all burners. The base of all flame jets
should be blue. The tips should be blue shading to orange.
NOTE: Dust, disturbed by any movement, will cause bright
orange flames. Wait for dust to settle.
3. For one burner, close the air shutter until some of its flame
jet tips turn yellow-white, indicating insufficient primary air.
Then open shutter until whitish tips disappear completely.
Set all burner shutters to the same opening. Observe to
make sure that no yellow-white tips appear over any portion
of the flame. Small yellow tips at the pilot location are permitted.
NOTE: This adjustment method gives MINIMUM primary air
setting for safe combustion. DO NOT attempt to make this
adjustment unless burners are at operating temperature.
Adjustment should be made with burner access panel in
final operating position. Use of a mirror may be helpful to
observe flames. Note that burner ports are on top of main
burner tube.
C. Main Burner Ignition Checkout and Pilot Adjustment.
1. The pilot flame must not smother or snuff out when test-
ed as follows:
a. Main burner ignition from cold start-repeat.
b. Continued operation of main burner.
c. Main burner ignition with appliance at maximum oper-
ating temperature after prolonged operation.
NOTE: Observe operation of the pilot burner with appliance doors in the final operating position. Use of a mirror may be helpful.
Figure 16.
CARE AND MAINTENANCE
WARNING: THE FLOW OF COMBUSTION AND VENTILATING AIR TO THE BOILER SHOULD NOT BE OBSTRUCTED.
This section must be brought to the attention of the owner by
the installer so that the owner can make the necessary
arrangements with a qualified service agency for the periodic
care and maintenance of this boiler. The installer must inform
the owner that the gas supplier can recommend a number of
qualified service agencies. The installer must also inform the
owner that the lack of proper care and maintenance of this boiler and any fuel burning equipment may result in a hazardous
condition.
1. GENERAL MAINTENANCE (Refer also to Owner’s
Information Manual)
These operations are recommended to be performed at regular intervals:
A. BOILER HEATING SURFACES: clean off all coatings
found.
B. BOILER CONTROLS: check contacts, settings, correct
functioning.
C. PIPING: check piping and accessories for leaks.
D. CHIMNEY VENTING SYSTEM: check for obstructions
and leaks.
E. BOILER ROOM AIR SUPPLY: check air vents for contin-
ued POSITIVE supply of air as required. Air needs are
greatest in cold weather. Air vents must be open and free
of obstruction.
F. WATER SYSTEM CHECK:
1. System to be full of water, and pressure to remain stable at correct setting on gauge.
2. Air control system: noise and air binding in radiation
should not occur
.
Page 12
12
3. Water lines: slightest leaks should be corrected.
4. Low water cutoff, for operation (see instructions furnished with unit).
2
. WATER LEVEL CHECK DURING HEATING SEASON
A. Check water pressure regularly and add water slowly to
system when needed. If much water is added, venting
may be necessary.
B
. Regular loss of water from water boiler system may indi-
c
ate either a system leak, or a faulty air control system,
or a faulty automatic fill valve.
3. ANNUAL INSPECTION AND CLEANING
A. It is important that this boiler be inspected by a compe-
tent serviceperson to help insure safe and reliable operation.
B. Check for gas leaks from valve and gas piping to burners
and pilot. If leaks are found, repair or replace as required.
C. This inspection should include:
1. Controls check. See “Safety Check for Control
System” (No. 4) below.
2. Recheck of input gas rate to burners. See "Initial
Start" paragraph in "Operating instructions" section.
3. Re-adjusting for best flame characteristics of main
flame and pilot(s).
See "Initial Start" paragraph in "Operating
Instructions" section and see "Burner Adjustment"
section.
4. Burner and boiler flue passage cleanliness:
BURNER AND FLUE CLEANING (see figure 17). It is
suggested that paper be placed on burners to collect
any foreign material when cleaning flues.
5. Remove jacket top and flue cover.
6. Use wire brush to clean flueways.
7. Replace flue cover and re-seal with furnace cement.
Replace jacket top. Remove and dispose of paper
and accumulated material.
8. If burner surfaces are not clean, or if uneven flame
indicates plugged burner ports, remove and clean
burners.
WARNING:
The ceramic combustion chamber in the burner box
contains crystalline silica.
Wear proper dust mask and gloves when servicing
combustion chamber or burners.
Crystalline Silica has been identified as a carcinogen or
possibly carcinogenic to humans.
NOTE-TO REMOVE BURNERS:
1. Disconnect pilot at pilot mount, or disconnect pilot gas
line at gas valve, before removing burners next to pilot.
2.
Lift burner and remove burner from orifice.
3. Clean and replace burners* and pilot. Adjust burners as
described on page 10.
* To clean burners run a clean flue brush up the tube until all foreign
matter is removed.
4. SAFETY CHECK FOR CONTROL SYSTEM
A. High limit control test: Set thermostat high enough for
boiler water temperature to reach high limit control setting. When this temperature is reached, the high limit
switch should open, and the main gas valve should close
Sentry
Figure 17.
automatically. If the high limit does not operate to close
the main gas valve, the valve, the high limit or the wiring
is faulty. Repair or replace immediately.
B. Gas valve safety shutdown test:
1. For boiler equipped with continuous burning pilot, with
main burners firing, disconnect the thermocouple
from the gas valve. The gas valve should immediately shut off the main burners and the pilot.
2. For boilers equipped with Honeywell S8600 intermittent pilot system, with main burners firing, disconnect
the ignition cable from the S8600 IGNITOR BOX. The
gas valve should shut off the main burners.
If the gas valve fails to shut down main burners when
the test in 1 or 2 is performed, replace the gas valve.
C. Check for gas leaks from valve and gas piping to burners
and pilot. If leaks are found, repair or replace as required.
5. PROVIDING PROTECTION FROM FREEZING
A. Anti-freeze is sometimes used in hydronic heating sys-
tems to protect against freeze-up in the event of power
failure or control shutdown when the building is unoccupied. It should be recognized that unless the building is
kept above freezing temperature by some means, the
plumbing system is not protected.
PROPYLENE GLYCOL is used in the quick-freeze food
industry; it is practically non-toxic. Its use may be permitted when tankless heaters are used. When anti-freeze
must be used, inhibited propylene glycol is recommended. Useful information on the characteristics, mixing
proportions, etc. of glycol in heating systems is given in
Technical Topics No. 2A, available from the Hydronics
Institute 34 Russo Place, Berkeley Heights, NJ 07922.
Consult glycol manufacturers for sources of propylene
glycol. DO NOT use ethylene glycol because it is toxic.
B. Water Treatment:
A good water treatment program will not only extend the
useful life of this boiler but it will also save much of the
time and expense of repairs made necessary by preventable occurrences.
A reputable water treatment company should be consulted to evaluate and determine the best overall treatment
program for your boiler equipment.
6. KEEP THE BOILER AREA CLEAR AND FREE FROM
COMBUSTIBLE MATERIALS, GASOLINE, AND OTHER
FLAMMABLE VAPORS AND LIQUIDS.
Page 13
Sentry
EQUENCE OF OPERATION FOR SENTRY BOILERS
S
EQUIPPED WITH CONTINUOUS BURNING PILOTS
OR DIAGRAMS SHOWN ON PAGE 14.
F
LIGHTED PILOT HEATS THERMOCOUPLE AND KEEPS PILOTSTAT OPEN.
THERMOSTAT CALLS FOR HEAT
13
CIRCULATOR ENERGIZED
(IF COMBINATION AQUASTAT
CONTROL USED)
VENT DAMPER MOTOR OPENS VENT DAMPER.
LIGHTED PILOT IGNITES MAIN BURNERS.
IF PILOT SHOULD BLOW OUT, THERMOCOUPLE
WHEN THERMOSTAT IS SATISFIED, OR WHEN HIGH LIMIT
OR LOW WATER CUT-OFF CONTACTS ARE OPEN, MAIN
VENT DAMPER CLOSES. CIRCULATOR OFF.
SYSTEM GOES TO STANDBY WITH LIGHTED PILOT.
HIGH LIMIT CONTACTS CLOSED?
LOW WATER CUT-OFF (WHEN USED)
CONTACTS CLOSED?
YES
VENT DAMPER RELAY ENERGIZED.
END SWITCH CLOSES.
MAIN VALVE OPERATOR OPENS.
WILL SHUT OFF MAIN BURNER.
VALVE OPERATOR CLOSES.
NO
NO FURTHER
CTION
A
SEQUENCE OF OPERATION FOR SENTRY BOILERS EQUIPPED WITH HONEYWELL INTERMITTENT
IGNITION SYSTEM (IID) FOR DIAGRAMS SHOWN ON PAGE 15.
THERMOST
A
T CALLS FOR HEA
T
CIRCULATOR ENERGIZED
(IF COMBINA
L.P. PROPANE GAS (S8600M & S8670E)
IGNITION TRIAL CONTINUES FOR 90 SEC-
ONDS. AFTER TRIAL FOR IGNITION, SYSTEM SHUTS OFF. AFTER 5 MINUTES MODULE RE-INSTATES TRIAL FOR IGNITION. IF
PILOT FLAME NO
TION TRIAL, SYSTEM SHUT-OFF AND 5
MINUTES WAIT SEQUENCE REPEATS
WHEN THERMOSTAT IS SATISFIED OR WHEN HIGH LIMIT OR LOW WATER CUT-OFF CONTACTS ARE OPEN, VALVE OPERA-
TORS CLOSE. PILOT & MAIN BURNERS OFF. VENT DAMPER CLOSES. CIRCULATOR OFF. SYSTEM GOES TO STANDBY.
T ESTABLISHED, IGNI-
CONTINUOUSL
TION A
Q
U
AST
A
CONTROL USED)
S8600F OR S8600M: IGNITION SPARK STARTS AND PILOT VALVE OPERATOR OPENS.
S8670E: IGNITION SPARK AND PILOT VALVE OPERATOR DELAYED FOR 30-70 SECONDS.
Y.
T
VENT DAMPER MOTOR OPENS VENT DAMPER.
SPARK GENERATOR MODULE POWERED.
HIGH LIMIT CONTACTS CLOSED?
LO
W
W
A
TER CUT
CONTACTS CLOSED?
VENT DAMPER RELAY ENERGIZED.
END SWITCH CLOSES.
IGNITION CONTROL ENERGIZED
THE PILOT FLAME ESTABLISHED ?
SPARK GENERATOR OFF. MAIN VALVE
OPERATOR OPENS. MODULE MONITORS
-OFF (WHEN USED)
YES
YES
PILO
T FLAME.
NO
NONO
NO FURTHER
ACTION
NA
TURAL GAS (S8600F) IGNI
TION SPARK CONTINUES.
PILO
T VALVE REMAINS OPEN
UNTIL SYSTEM IS RESET.
-
Page 14
14
Sentry
CAUTION: Label all wires prior to disconnection when servicing controls.
Wiring errors can cause improper and dangerous operation. “Verify proper operation after servicing.”
WIRING DIAGRAM — CONTINUOUS PILOT
Page 15
Sentry
CAUTION: Label all wires prior to disconnection when servicing controls.
W
iring errors can cause improper and dangerous operation. “Verify proper operation after servicing.”
WIRING DIAGRAM — INTERMITTENT IGNITION (IID)
15
Page 16
16
UMP OR VALVE ZONING OF WATER BOILERS
P
COMBINATION CONTROLS WITH T TV Z TERMINALS*
Sentry
Pump Zoning system using R845A Relay.
One R845A needed for each circulator.
NOTE: Pumps are powered from C1 . Total
pump load must not exceed 7.4 amp rating of
combination control pump switch.
Zone valve zoning system using Honeywell V8043F zone valves.
Pump zoning system using R8230C Relays.
*For zoning diagrams, combination controls without T TV Z terminals and non-combination control systems, consult Slant/Fin Zoning Tech. Bulletin.
NOTE: Pumps are powered from C1 . Total pump load must not exceed 7.4 amp rating of combination control pump switch.
Page 17
Sentry
BURNERS FAIL TO OPERATE
CAUSE
1. Safety pilot out, or flame too low.
2. Gas supply valve shut off.
3. Electric switch open.
4. Blown or defective line fuse.
5. Operating or limit control contacts open or dirty.
6
. Defective gas valve or pressure regulator; or plugged
b
leed line.
7. Defective low voltage transformer.
8. Obstruction at main burner orifice.
9. Break in wiring or loose contact at control terminals.
10. Improper wiring.
11. Improper controls.
12. Rollout or blocked vent safety switch open.
BURNERS WILL NOT SHUT OFF
CAUSE
1. Defective operating control, gas valve, or high limit
control.
2. Improper wiring or short circuit.
FLASH BACK - BURNING AT ORIFICES
CAUSE
1. Manifold gas pressure too low.
2. Improper primary air adjustment.
3. Gas regulator bleed too slow.
4. Burrs on orifice.
5. Improperly drilled orifice plugs.
6. Leaking automatic gas valve.
7. Adverse draft condition in boiler room.
8. Low main gas pressure.
9. Safety pilot improperly installed.
DELAYED IGNITION
CAUSE
1. Pilot flame too low.
2. Pilot burner ports or pilot orifice clogged.
3. Burners or orifices out of alignment.
4. Excessive primary air.
5. Excessive burner input.
6. Adverse draft condition in boiler room.
FUMES AND GAS ODORS
CAUSE
1. Leaks in gas piping or accessories.
2. Gas leaks in service line or meter connections.
3. Blocked chimney.
4. Boiler flueways blocked with soot.
5. Undersized breeching or too many turns in breeching.
6. Adverse draft condition in boiler room.
7. Overfiring.
CONDENSATION IN BOILER FLUES OR IN VENT SYSTEM
CAUSE
1. Underfiring.
2. Boiler water maintained at too low a temperature level.
3. Long horizontal run of smokepipe.
4. Inadequate chimney or venting system.
GENERAL TROUBLESHOOTING GUIDE FOR SERVICEPEOPLE
REMEDY
1. Check, clean, re-light. See instructions.
2. Open gas valve(s).
3. Close switch.
4. Replace fuse.
5. Check control. Clean contacts or replace control.
6
. Repair or replace.
7. Replace transformer.
8. Check, clean and reinstall.
9. Check with test-light and correct.
10. Check and correct in accordance with wiring diagrams
included with appliance instructions.
11. Install proper controls.
12. Replace rollout switch (inspect flue passages prior to
replacement) or reset blocked vent safety switch by
depressing the reset button.
REMEDY
1. Check, repair or replace.
2. Check wiring and controls.
REMEDY
1. Adjust to proper manifold pressure.
2. Adjust air to produce soft, clean flame.
3. Adjust bleed opening.
4. Remove burrs.
5. Install orifice plugs with proper drilling.
6. Repair or replace.
7. Check air supply and venting system.
8. Contact utility.
9. Correct to manufacturer's recommendations.
REMEDY
1. Increase gas supply to pilot.
2. Clean ports or orifices.
3. Realign burners or manifold.
4. Adjust primary air shutters.
5. Check and reduce to input shown on rating plate.
6. Check air supply and venting system.
REMEDY
1. Locate leaks and repair.
2. Close service supply valve - shut down appliance and
notify utility.
3. Check and repair chimney.
4. Clean flueways and adjust burners as described in the
installation instructions.
5. Check manufacturer's recommendations.
6. Check air supply and venting system.
7. Adjust gas input to that shown on boiler rating plate.
REMEDY
1. Increase firing rate to that shown on rating plate.
2. Set low limit controls to maintain a higher water temperature. If boiler is not equipped with low limit replace
with one which has a combination low limit/high limit
aquastat.
3. Relocate boiler or insulate breeching.
4. Check chimney and venting recommendations.
17
Page 18
18
PIPING A HEATING - COOLING SYSTEM TO A WATER
BOILER AND CHILLER
Sentry
The chiller must be piped in parallel with the boiler.Figure below
illustrates a method of piping a heating-cooling system to a
water boiler and a chiller. Hand valves (shown) or automatic
valves must be installed to prevent circulation of chilled water in
t
he boiler or hot water in the chiller.
The air control system and pressure control system must operate with chiller only, or the boiler only, being valved to the piping
system.
IF REPLACEMENT PARTS ARE NEEDED
Separate control devices on the boiler and chiller may be used,
or a single set of air and pressure controls on the common piping may be preferred.
If the boiler is used to supply hot water to heating coils in air
handling units, flow control valves or other devices must be
installed to prevent gravity circulation of water in the coils during the cooling cycle.
When parts are needed, refer to boiler model and serial number shown on the boiler name/rating plate. Refer to publication
number S-10PL Sentry Replacement Parts for part numbers.
Whenever possible refer to the original order by number and
date.
Control identification and replacement should not be attempted
by unskilled personnel. Only simple, easily-identified controls
and parts may be obtained locally. All other controls and
parts should be identified by and ordered from Slant/Fin.
Relief/Safety valves must be ASME rated for the pressure and
gross output of the boiler.
For replacement parts, heating contractors should contact their
Slant/Fin boiler distributor.
Page 19
Sentry
APPENDIX A
Removal of Existing Boiler from Common Vent System
"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
a
re not in operation."
19
(a) Seal any unused openings in the common venting system.
(b) Visually inspect the venting system for proper size and hor-
i
zontal pitch and determine there is no blockage or restriction, leakage, corrosion and other deficiencies which could
cause an unsafe condition.
(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 clothes
dryer and any appliance not connected to the 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.
(d) Place in operation the appliance being inspected. Follow the
lighting instructions. Adjust thermostat so appliance will
operate continuously.
(e) Test for spillage at the draft hood relief opening after 5 min-
utes of main burner operation. Use the flame of a match or
c
andle, 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.
(g) Any improper operation of the common venting system
should be corrected so the installation conforms with the
National Fuel Gas Code, ANSI Z223.1-latest edition. 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
Appendix G in the National Fuel Gas Code, ANSI Z223.1latest edition.
Page 20
SLANT/FIN CORPORATION, Greenvale, N.Y. 11548 • Phone: (516) 484-2600
F
AX: (516) 484-5921
• Canada:
Slant/Fin
L
TD/LTEE
, Mississauga, Ontar
www
.slantfin.com
io
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