Slant/Fin S-150 User manual

CONTENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PAGE
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,3
Installation Requirements:
Boiler Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Boiler oundation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Chimney Requirements . . . . . . . . . . . . . . . . . . . . . . . . 4
Minimum Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Vent Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Vent Damper Installation . . . . . . . . . . . . . . . . . . . . . . . 5
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical Controls and Wiring. . . . . . . . . . . . . . . . . . 6-9
Boiler Water Temperature Control. . . . . . . . . . . . . 10-11
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . 12
Boiler Room Air Supply and Ventilation . . . . . . . . . . . 13
Water Piping at Boiler . . . . . . . . . . . . . . . . . . . . . . . . 13
Operating Instructions:
illing and Venting Water Systems. . . . . . . . . . . . . . . 13
Initial Start:
Safety Information and Lighting Instruction . . . . . . . . 14
Burner Adjustment, Checking Gas Input . . . . . . . 14-15
Care and Maintenance
General Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . 15
Water Level Check . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Annual Inspection and Cleaning . . . . . . . . . . . . . . . . 16
Safety Check for Control Systems . . . . . . . . . . . . . . . 16
Protection from reezing/Water Treatment. . . . . . . . . 16
Keeping Area Clear . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Piping a Heating-Cooling System . . . . . . . . . . . . . . . . . . 18
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Appendix A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
H T WATER M DELS S-34 THR UGH S-150
INSTALLATI N AND PERATING INSTRUCTI NS
GAS-FIRED CAST-IR N B ILERS F R NATURAL AND L.P. PR PANE GASES
SENTRY
IMPORTANT
READ ALL F THE F LL WING WARNINGS AND
STATEMENTS BEF RE READING THE
INSTALLATI N INSTRUCTI NS
WARNING
LIQUE IED PETROLEUM (L.P.)
PROPANE GAS- IRED BOILERS
Installation location ONLY as permitted in paragraph enti-
tled "LIQUE IED PETROLEUM (L.P.) PROPANE GAS-
IRED BOILER LOCATION" on page 4 of this instruction
book. The above warning does not apply to NATURAL
gas-fired boilers.
The installation must conform to the requirements of the
authority having jurisdiction or, in the absence of such
requirements, to the National uel Gas Code, ANSI Z223.1-
latest edition. The installation must also conform to the
additional requirements in this Slant/ in Instruction Book
.
In addition, where required by the authority having jurisdic-
tion, the installation must conform to American Society of
Mechanical Engineers Safety Code for Controls and Safety
Devices for Automatically ired 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.
WARNING
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.
®
Printed in U.S.A. 812 PUBLICATI N S-41
Part No. 46-0602
Heating Contractor
Address
Phone Number
Boiler Model Number
Boiler Serial Number
Installation Date
This manual must be left with
owner and should be hung on or
adjacent to the boiler for reference.

2Sentry
Note: Height dimension increases by 1-3/4" when comustible floor kit is used.
* Vent damper may be installed horizontally on all models with use of a vent elbow. or more information, see figure 2, page 5.

3
Sentry
The installation must conform to the requirements of the authority
having jurisdiction or, in the absence of such requirements, to the
National uel Gas Code, ANSI Z223.1-latest edition.
This installation must also conform to the additional requirements
in this Slant/ in Instruction Book.
NATURAL GAS-FIRED B ILER L CATI N
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 com-
ponents are protected from water (dripping, spraying, rain, etc.)
during appliance operation and service (circulator replacement,
condensate trap, control replacement, etc.).
B ILER F UNDATI N
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. or installation on non-combustible floors only. The
Combustible loor 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 ire Underwriters for specific requirements.
S-34 28
1⁄8" 145⁄8"4 33" ——6 1⁄4" 190
S-60 3 111⁄8" 175⁄8"4 37" 41⁄2" 26" 61⁄4" 250
S-90 4 141⁄8" 205⁄8"5 37" 51⁄2" 251⁄2"6
1⁄4" 310
S-120 5 171⁄8" 235⁄8"6 37" 71⁄2" 25" 61⁄4" 365
S-150 6 201⁄8" 265⁄8"7 37" 81⁄2" 241⁄2"8
1⁄4" 425
Boiler
Model
Gas
Type 2000 3000 4000 5000 6000 7000 8000 9000 10000
rifice
Size for
Sea
Level
rifice Sizes for High Altitudes
Includes 4% Reduction for Each 1000 Feet
Elevation - Feet
No. of
Sect.
Dimensions
(inches)
A B C D E FG
(max)
Approx.
Total Wt.
Full of
Water (lb.)
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
CHIMNEY REC MMENDATI NS
HEIGHT:15 ft. (minimum) from draft
hood skirt to top of chimney.
INSIDE DIAMETER: Same as dimen-
sion C (or larger).
NOTE: Larger chimney may be
required if two or more boilers or a boil-
er and another appliance are vented to
a single chimney.
Slant/ in supplies vent dampers by
several manufacturers. Some are
smaller than the indicated “G maxi-
mum”.
Orifice indicated for sea level above are factory installed in boiler unless otherwise specified by the local authority.
See page 14 for burner input adjustment.
Boiler
Model
S-34
S-60 thru S-150
Base Assembly
Sentry Boiler
Burners
Pilot
Burner
Access
Door
Gas Valve
INSTALLATI N REQUIREMENTS

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-combustible material.
SAFETY—
KEEP THE BOILER AREA CLEAR AND REE ROM
COMBUSTIBLE MATERIALS, GASOLINE AND OTHER
LAMMABLE VAPORS AND LIQUIDS.
VENT PIPING—
A. Vent piping installation must be in accordance with ANSI
Z223.1-latest edition, National uel Gas Code, 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 natur-
al draft shall not be connected into any portion of mechani-
cal draft systems operating under positive pressure.
Horizontal breeching or vent pipe should be as high as pos-
sible, consistent with codes, so that vertical vents from appli-
ances 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
must be supported to prevent sagging by securing each joint
with metal screws and by providing hanger spaced no
greater than 5 feet apart.
4Sentry
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 National uel Gas Code ANSI Z223.1, N PA 54, -latest
edition which will be referred to as the National uel 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 uel
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 require-
ments of the National uel Gas Code.
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. ollow the test procedure shown in
Appendix “A” 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 FR M C MBUSTIBLE
C NSTRUCTI NS
WARNING
LIQUEFIED PETR LEUM (L.P.) PR PANE
GAS-FIRED B ILER L CATI N
REQUIRES SPECIAL ATTENTION
Liquefied Petroleum (L.P.) propane gas is heavier than air.
Therefore, propane boilers, piping, valves should not be
installed 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.
The UNIF RM MECHANICAL C DE may be in effect in
your geographic area
The following precautions are cited by the 1994 UNI ORM
MECHANICAL CODE, section 304.6:
“LPG Appliances. Liquefied petroleum gas-burning
appliances shall not be installed in a pit, basement or sim-
ilar location where heavier-than-air-gas might collect.
Appliances so fueled shall not be installed in an above-
grade under-floor space or basement unless such loca-
tion is provided with an approved means for removal of
unburned gas.”
Consult Chapter 5 of the 1994 UNI ORM MECHANICAL
CODE for design criteria of the “approved” means for removal
of unburned gas.
SENTRY SERIES
MINIMUM CLEARANCE OR COMBUSTIBLE CONSTRUC-
TION. MINIMUM ALCOVE AND CLOSET CLEARANCE.
S-34 through
S-150
ront 6"
Rear 6"
Left Side 6"
Right Side 12"
Top (above boiler) 12"
lue Connector 6"

5
Sentry
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.
VENT DAMPER INSTALLATI N
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 spe-
cific Slant/ in Corp. gas boiler models. These boilers must also
be equipped with a plate which states that the boiler may be
used with a Slant/ in Corp. automatic vent damper device and
indicates the proper vent damper model number.
A. INSTALLATION INSTRUCTIONS BE ORE 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 mod-
els (see figures 1 and 2).
4. Carefully unpack the unit. DO NOT ORCE IT OPEN OR
CLOSED. orcing the damper may damage the gear
train and void the warranty.
F gure 1. Vert cal Installat on of Vent Damper on Sentry “S”
Bo lers
F gure 2. Hor zontal Installat on of Vent Damper
F gure 3.
WARNING—DANGER
Once you have begun vent damper installation procedure, DO
NOT restore electric power and gas supply until installation and
inspection have been completed (in order to prevent the main
burners from operating). DO NOT operate the boiler until the vent
damper harness is plugged into vent damper operator. ailure to
observe this warning may create a hazardous condition that
could cause an explosion or carbon monoxide poisoning.

6Sentry
B. 1. This device must be installed after the boiler draft hood
(between the draft hood outlet and the connector to the out-
door chimney or vent) as close to the draft hood as practi-
cable, 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 nomi-
nal 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 appli-
ance for which it is installed. (See figure 3.)
4. Clearances of not less than 6 inches (152MM) must be
maintained from combustible materials, with provisions for
service access.
C. A TER INSTALLATION:
1. Operate system through two complete cycles to check for
opening and closing in proper sequence, and proper burn-
er operation. DAMPER MUST BE IN OPEN POSITION
WHEN BOILER MAIN BURNERS ARE OPERATING.
2. Perform installation checks as required by ANSI specifica-
tion Z21.66. (See Vent Damper Instructions.)
3. Check the troubleshooting section if problems arise with the
installation.
D. THERMOSTAT HEAT ANTICIPATOR ADJUSTMENTS
If the 24V room thermostat that controls this boiler has an
adjustable heat anticipator and has previously been adjusted with-
out a vent damper, then see publication VD-40 for correct electri-
cal requirement adder for the vent damper used. If room thermo-
stat 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 cur-
rent measured. or more information, see Slant/ in 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 petro-
leum 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 natur-
al 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,
insufficient heat and other installation difficulties. or more
information and also if other appliances are to be attached
to the piping system, see Appendix C of National uel 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 disconnect-
ed from the gas supply piping system during any pressure test-
ing of that system at test pressures in excess of 1/2 PSIG.
This boiler must be isolated from the gas supply piping sys-
tem 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 pro-
vided, 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.
ELECTRICAL C NTR LS AND WIRING—
A. The electrical power to the boiler must be on a separately
fused and live circuit.
B. 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/N PA No. 70-latest edition.
C. See figure 5a and 5b for wiring diagram on pages 8 and 9.
ELECTRICAL WIRING
DANGER: Before wiring, always turn off electric power supply,
otherwise, shock or death can result.
1. Power Supply
A separately fused circuit is recommended. Use a standard
15 amp. fuse or breaker and 14 gage conductors in BX
cable or conduit.
Provide disconnect means and overload protection as
required. See boiler wiring diagram ( igure 4).
Boiler must be electrically grounded in accordance with the
requirements of the authority having jurisdiction, or, in the
absence of such requirements, with the National Electrical
Code, ANSI/N PA 70-latest edition.
2. Power Connection
Connect hot and neutral to L1 and L2 terminal of the
boiler control (See figure 4). Connect ground wire to ground
screw inside boiler control.
3. Thermostat Connections
Thermostat wire connections must be to T and TV screw
terminals of boiler temperature control (See figure 4).
4. Multi Zoning
or pump zoning system, see figure 5 and 6 for zone valve
system, see figure 7. DO NOT use boiler transformer to
power external accessories like zone valve and relay, over
load and/or burned-out transformer and boiler malfunction
can result.
1/2 3/4 1 1-1/4 1-1/2
10 132 278 520 1050 1600
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
Length
of Pipe
in Feet
Gas Flow In Piping -- cu. ft. per hr.
Iron Pipe Size (IPS)—inches
At pressure drop of 0.3 in. water, specific gravity = 0.60.

7
Sentry
F gure 4.
CAUTION:
LABEL ALL WIRE PRIOR TO DISCONNCTION WHEN SERVICING CONTROLS.
WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION.
"VERIFY PROPER OPERATION AFTER SERVICING".
: PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED
WITH THE APPLIANCE MUST BE REPLACED.
IT MUST BE REPLACED WITH TYP 105` OR
ITS EQUIVALENT.
IGNITER CABLE
PILOT GAS PIPE
ELECTRIC
IGNITION
PILOT
CIRCULATOR
L2
L1 C1
C2 B1
HONEYWELL IGNITION MODULE
24V(GND)
24V
I2
B2
VENT DAMPER
HARNESS
I1
WIRE LEGEND:
FACTORY WIRED
FIELD WIRED, FIELD SUPPLIED
IMV-PVMV
GND PV
MV/PV
MV
GAS VALVE
GND
(BURNER)
PV
ECONOMY
HI TEMP
Z
T
TV
WIRING DIAGRAM FOR SENTRY(S) & SENTINEL(SE) BOILERS
HYDROLEVEL HYDROSTAT CONTROL
MODEL 3200
PLUG
LO TEMP
24V
THERMOSTAT
I
120V
HOT
NEUTRAL
46 1014 000
BLOCKED VENT
SAFETY SWITCH
ROLL-OUT
SWITCH
RED
WHITE
BLK
BLUE
BLACK
WHITE
BLACK
GREEN
GREEN
RED
WHITE
RED RED
RED

8Sentry
F gure 5. Mult zon ng of Sentry bo lers pump zon ng system us ng R845A relay.
F gure 6. Mult zon ng of Sentry bo ler-2 zone system pump zon ng system us ng R882A/B relays.

9
Sentry
F gure 7. Mult zon ng of Sentry bo lers zone valve system us ng R8043E/F zone valves.

Dynamic
Display
Water Temperature
and Real Time
Verification of
Setting Adjustments.
Low Temperature
Limit Setting
(OFF or 110°-200°F)
Factory OFF
High Temperature
Limit Setting
(100°-220°F)
Factory 190°F
Diagnostic LEDs
and Test Button
Jumper
Economy Dial
(OFF or LO, 1, 2, 3,
4, 5, HI)
Indicator Light
(announces heat call)
Differentials are
automatic and will
vary based on
control settings and
boiler temperature.
10 Sentry
NTE:Settings can be checked
using the TEST/SETTINGS Button.
SETTING THE HIGH LIMIT
The high limit is factory set at
190°
. To adjust, turn the HI
TEMP DialAuntil the desired
setting is displayed. (Setting
range: 100°-220°)
SETTING THE LW LIMIT
The low limit is designed to main-
tain temperature in boilers equipped with tankless
coils used for domestic hot water. The low limit is fac-
tory set to O . Prior to adjusting, remove the jumper
(not equipped on all units) B . Then turn the LO TEMP
Dial Cclockwise until the desired temperature is dis-
played. or proper operation, the low temperature limit
setting should be at least 10° below the high limit set-
ting. NOTE: or cold start operation, the low limit must
be turned O . IMPORT
ANT: If low limit temperature
cannot be set above 140°
, remove jumper B.
(Setting range: O or 110°-200°).
SETTING THE EC N MY FEATURE
The Economy eature is factory set for a 1 zone heating system.
To adjust, turn the ECONOMY Dial D until the number dis-
played equals the number of heating zones. Do not include indi-
rect water heaters in the number of heating zones. The Economy
eature conserves fuel by reducing boiler temperature (see “How
Thermal T
argeting Works” below). If the heating system is unable
to supply needed heat to the house, the ECONOMY Dial should
be turned to a lower setting (example: In a three zone house, turn
the dial to 2 or 1). Conversely, if the boiler provides adequate
heat, added fuel savings can be achieved by selecting a higher
setting (example: 4 or 5). If the heating and indirect water heater
signals were not separated when wiring the control, the Economy
eature should be turned O to insure the boiler supplies ade-
quate temperature to heat the indirect tank.
ACTIVATING THERMAL PRE-PURGE ( PTI NAL)
N TE: Activation of this feature is not recommended for boilers
with tankless coils.
uel Smart HydroStat has a Thermal Pre-Purge feature to
maximize efficiency. When activated, the control will purge higher
boiler temperatures down to 135° at the start of any thermostat
call and supply the latent energy in the boiler to the heating zone
that is calling. During the purge cycle, the display will indicate Pur.
If the heat is not sufficient to satisfy the thermostat, the control will
energize the burner. This feature works with single- and multi-zone
heating systems utilizing circulators or zone valves. No change in
wiring is needed.
To Activate Thermal Pre-Purge
Push and hold the TEST/SETTINGS button for 20 seconds. The dis-
play will read Pur On. T
o deactivate the feature, push and hold the
button a second time for 20 seconds. The display will read Pur O
.
SETTING THE C NTR L
At initial start up, with the Economy eature active, the control
establishes a 145° target temperature. To test the high limit
shut-off function, the Economy Dial must be turned to O .
Once tested, restore the Economy setting. If the heating
demand is high, the target will increase over time to satisfy the
heat load. NOTE: To reduce the potential for condensing, the
control will allow the boiler to heat to 120° prior to energizing
the circulator.
Thermal Targeting technology analyzes thermostat activity and
continually evaluate how much heat the house requires. When
it is very cold outside, the heat demand is high and the uel
Smart HydroStat will raise the boilers Target temperature to
provide needed heat to the home. When the outside tempera-
ture is milder, the heat demand is lower. During these periods,
the uel Smart HydroStat will lower the boilers Target temper-
ature – saving fuel – while continuing to provide comfort to the
house.
SYSTEM START-UP H W THERMAL TARGETING W RKS
B ILERS EQUIPPED WITH HYDR STAT C NTR L
SETTING
OFF Disables economy function. Will allow boiler to fire until hi
limit temp is reached and re-fire with a 10° subtractive
differential.
LO Provides lowest level of fuel savings. Use this setting only
if the house does not stay warm at higher settings.
1Recommended setting for single zone systems
2Recommended setting for Two zone systems
3Recommended setting for Three zone systems
4Recommended setting for our zone systems
5Recommended setting for ive zone systems
HI Provides highest level of fuel savings

11
Sentry
uTEMP ACTIVE Indicates that the
uel Smart HydroStat control is pow-
ered and that the temperature function
is active.
vTEMP HIGH TEMP Illuminates
when the boiler water temperature
reaches the high limit setting. It will
remain lit until the water temperature falls
10° (see High Limit Differential on page
4). The uel Smart HydroStat prevents
burner operation while this LED is on.
wLWCO ACTIVE Indicates that the low water cut-off (LWCO)
function of the uel Smart HydroStat is active. When the
control is installed with a Hydrolevel Electro-Well, this LED will be
on at all times when the control is powered.
IMP RTANT: If the control is installed with a well other than the
Electro-Well, this LED will not illuminate indicating that the control
is not providing low water cut-off functionality.
❹LWCO LOW WATER Illuminates if the boiler is in a low water
condition. The uel Smart HydroStat will prevent burner operation
during this condition. IMP RTANT: The system must be checked
by a qualified heating professional prior to resuming operation.
WARNING: D N T ADD WATER UNTIL THE B ILER
HAS FULLY C LED.
❺ECONOMY ACTIVE Indicates that the Thermal Targeting
function is active and the uel Smart HydroStat will reduce boiler
temperature to conserve fuel. The Economy feature is activated
using the ECONOMY dial. (See “How Thermal Targeting Works”
on page 4 for more information).
➏ECONOMY TARGET When the Economy feature is active,
the uel Smart HydroStat continually sets target temperatures
below the high limit setting to maximize fuel efficiency. When the
boiler water reaches the target tempera-
ture, the LED illuminates and the burner
will shut down. The boiler water will con-
tinue to circulate and heat the house as
long as the thermostat call continues.
The LED will stay lit until the boiler tem-
perature drops to the differential set point
(see Target Temp Differential on page 4)
at which point the boiler will be allowed to
fire again. NOTE: This LED illuminates
regularly during normal boiler operation.
❼TEST/SETTINGS Button
To Test Low Water Cut- ff: Press and hold the Test/Settings but-
ton for 5 seconds. The display will read LCO.
LWC TEST LCO
The red Low Water light should illuminate and the burner circuit
(B1 and B2) should de-energize. NOTE: The control must be
installed with a Hydrolevel Electro-Well for low water cut-off func-
tionality (see page 2 for more details).
To View Current Settings: Press and release the Test/Settings Button
in short intervals to sequentially display the following settings:
HIGH LIMIT SETTING HL
q
LOW LIMIT SETTING LL
q
ECONOMY SETTING ECO
q
CURRENT TARGET TEMPERATURE ooo
q
PRE-PURGE SETTING Pur
The display will return to boiler temperature (default) if
Test/Settings Button in not pressed for 5 seconds.
ACTIVE HI TEMP ACTIVE LOW WATER ACTIVE TARGET TARGET SETTINGS
❶❷❸❹❺❻❼
TEMP LWC EC N MY
LED LEGEND and TEST/SETTINGS BUTT N

12 Sentry
SEQUENCE F PERATI N F R SENTRY B ILERS
THERMOSTAT CALLS OR HEAT
HIGH LIMIT CONTACTS CLOSED?
LOW WATER CUT-O
CONTACTS CLOSED?
VENT DAMPER RELAY ENERGIZED.
VENT DAMPER MOTOR OPENS VENT DAMPER.
END SWITCH CLOSES.
IGNITION CONTROL ENERGIZED
THE PILOT LAME ESTABLISHED ?
SPARK GENERATOR O . MAIN VALVE
OPERATOR OPENS. MODULE MONITORS
PILOT LAME.
WHEN THERMOSTAT IS SATIS IED OR WHEN HIGH LIMIT OR LOW WATER CUT-O CONTACTS ARE OPEN, VALVE OPERA-
TORS CLOSE. PILOT and MAIN BURNERS O . VENT DAMPER CLOSES. CIRCULATOR O . SYSTEM GOES TO STANDBY.
SPARK GENERATOR MODULE POWERED.
S8600 OR S8600M: IGNITION SPARK STARTS AND PILOT VALVE OPERATOR OPENS.
S8670E: IGNITION SPARK AND PILOT VALVE OPERATOR DELAYED OR 30-70 SECONDS.
L.P. PROPANE GAS (S8600M and
S8670E) IGNITION TRIAL CONTINUES
OR 90 SECONDS. A TER TRIAL OR
IGNITION, SYSTEM SHUTS O .
A TER 5 MINUTES MODULE RE-
INSTATES TRIAL OR IGNITION. I
PILOT LAME NOT ESTABLISHED,
IGNITION TRIAL, SYSTEM SHUT-O
AND 5 MINUTES WAIT SEQUENCE
REPEATS CONTINUOUSLY.
NATURAL GAS (S8600 ) IGNI-
TION SPARK CONTINUES.
PILOT VALVE REMAINS OPEN
UNTIL SYSTEM IS RESET.
CIRCULATOR ENERGIZED NO URTHER
ACTION
YES
NO
YES
NO NO

13
Sentry
B ILER R M AIR SUPPLY AND VENTILATI N
An ample supply of air is required to obtain combustion and
ventilation. ALL AIR COMES ROM OUTSIDE, directly through
wall openings to the boiler or through unsealed openings
around windows, doors, etc. in the whole building. When build-
ings are insulated, caulked and weather stripped, now or later
on, direct openings to outside may be required and should be
provided. If the boiler is not near an outside wall, air may be
ducted to it from outside wall openings.
Provisions for combustion and ventilation air must be made in
accordance with section “Air for Combustion and Ventilation”, of
the National uel Gas Code, ANSI Z223.1-latest edition, or
applicable provisions of the local building codes. The following
recommendation applies to buildings of energy-saving con-
struction, 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. or a total appliance input of 200,000 Btuh, each open-
ing 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 win-
dows 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.
or some installations, the pump should be on
the supply main. See figure 8.
II. AIR CONTROL SYSTEM
A. DIAPHRAGM-TYPE COMPRESSION TANKS are used
to control system pressure in an AIR ELIMINATING SYS-
TEM: an automatic air vent is used to REMOVE air from
the system water. See figure 8. If system pressure needs
further control, add an additional tank or install a larger
capacity tank. Locate the tank near the boiler, as illustrat-
ed.An automatic air vent should be installed in the top of
the boiler or air purger. See figure 8.
B. PUMP LOCATION — Locating low-head pump(s) on
return to boiler is acceptable for smaller boiler sizes in
residences of one or two stories. The alternate pump
location shown in illustration is required in large, multi-
story 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).
IMPORTANT: Hot water heating systems containing high
water volume, such as would occur with cast-iron radia-
tion, require special care with air elimination.
The circulator pump should be located on the boiler sup-
ply pipe and the expansion tank and air scoop should be
located near the pump suction.
F gure 8. P p ng Arrangement
C. Radiant floor and low water temperature systems:
A boiler by pass loop, three way valve arrangement, or pri-
mary secondary pumping (with a boiler loop) must be used
to provide a minimum 130˚ return water temperature to
the boiler. This will prevent condensation on the cast iron
sections that can result in improper operation of the boiler.
FILLING AND VENTING WATER SYSTEMS
A. ill the system with water. Vent or purge off air.
B. ire 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 tem-
perature 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 dia-
grams.
5. Using soap solution, check for gas leaks in all gas piping
from meter to boiler pilot and manifold. DO NOT use
open flame.
PERATING INSTRUCTI NS

14 Sentry
SAFETY INF RMATI N
OR YOUR SA ETY READ BE ORE 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
automatically lights the pilot. DO NOT try to light the pilot
by hand.
B. BE ORE OPERATING 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 I 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. ollow 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 techni-
cian. orce 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.
perating Instructions
1. ST P! 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 "O ". 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, ST P! ollow "B" in the safety information
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 techni-
cian or gas supplier.
To Turn ff 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 till knob stops,
then continue to "O ". DO NOT force.
5. Replace control access panel.
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 man-
ifold 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:
or 1000 Btu/cu.ft. gas, this becomes:
Btuh Input = cu. ft. metered in 3 minutes
x 1000 Btu/cu.ft. x 20
Example #2:
or 1050 Btu/cu.ft. gas, this becomes:
Btuh Input = cu. ft. metered in 3 minutes
x 1050 Btu/cu.ft. x 20
4. The higher* heating value of gas varies substantially for
different localities. Consult with Slant/ in’s Technical
Service Dept. for re-orificing procedures if any of the fol-
lowing apply:

15
Sentry
a. Boiler (burner) is overfiring. CAUTI N! National uel
Gas Code ANSI Z223.1-latest edition, does NOT per-
mit firing at a higher input rate than the input rate indi-
cated on the boiler rating plate in order to avoid haz-
ardous conditions such as explosion or carbon
monoxide poisoning.
b. Poor higher* heating value of gas is causing the actu-
al input to be substantially lower than the rating plate
indication.
* “Higher heating value” of gas is commonly known as a “heating value.”
34 1.70
60 3.00
90 4.50
120 6.00
150 7.50
180 9.00
210 10.50
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
B. Main Burners
1. ire 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. or 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 per-
mitted.
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 appli-
ance doors in the final operating position. Use of a mir-
ror may be helpful.
2. Safety Shutdown Checkout
a. or 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
clockwise will decrease the pilot flame.
c. Check safety shutdown of gas valve by following procedure
outlined "CARE" and "MAINTENANCE" section.
WARNING: THE LOW O COMBUSTION AND VENTILAT-
ING 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 boil-
er 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 reg-
ular intervals:
A. BOILER HEATING SUR ACES: 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.
. WATER SYSTEM CHECK:
1. System to be full of water, and pressure to remain sta-
ble at correct setting on gauge.
2. Air control system: noise and air binding in radiation
should not occur.
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.
CARE AND MAINTENANCE

16 Sentry
3. Water lines: slightest leaks should be corrected.
4. Low water cutoff, for operation (see instructions fur-
nished with unit).
2. WATER LEVEL CHECK DURING HEATING SEAS N
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-
cate either a system leak, or a faulty air control system,
or a faulty automatic fill valve.
3. ANNUAL INSPECTI N AND CLEANING
A. It is important that this boiler be inspected by a compe-
tent serviceperson to help insure safe and reliable oper-
ation.
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 LUE 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.
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 F R C NTR L SYSTEM
A. High limit control test: Set thermostat high enough for
boiler water temperature to reach high limit control set-
ting. When this temperature is reached, the high limit
switch should open, and the main gas valve should close
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:
or 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 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. PR VIDING PR TECTI N FR M 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 unoccu-
pied. 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 permit-
ted when tankless heaters are used. When anti-freeze
must be used, inhibited propylene glycol is recommend-
ed. 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 pre-
ventable occurrences.
A reputable water treatment company should be consult-
ed to evaluate and determine the best overall treatment
program for your boiler equipment.
6. KEEP THE B ILER AREA CLEAR AND FREE FR M
C MBUSTIBLE MATERIALS, GAS LINE, AND THER
FLAMMABLE VAP RS AND LIQUIDS.
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.

17
Sentry GENERAL TR UBLESH TING GUIDE F R SERVICEPE PLE
BURNERS FAIL T PERATE
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
bleed line.
7. Obstruction at main burner orifice.
8. Break in wiring or loose contact at control terminals.
9. Improper wiring.
10. Improper controls.
11. Rollout or blocked vent safety switch open.
BURNERS WILL N T SHUT FF
CAUSE
1. Defective operating control, gas valve, or high limit
control.
2. Improper wiring or short circuit.
FLASH BACK - BURNING AT RIFICES
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 IGNITI N
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 D RS
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.
C NDENSATI N IN B ILER FLUES R 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.
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. Check, clean and reinstall.
8. Check with test-light and correct.
9. Check and correct in accordance with wiring diagrams
included with appliance instructions.
10. Install proper controls.
11. 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 temper-
ature. 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.

18 Sentry
PIPING A HEATING - C LING SYSTEM T A WATER
B ILER AND CHILLER
The chiller must be piped in parallel with the boiler. igure 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
the boiler or hot water in the chiller.
The air control system and pressure control system must oper-
ate with chiller only, or the boiler only, being valved to the piping
system.
Separate control devices on the boiler and chiller may be used,
or a single set of air and pressure controls on the common pip-
ing 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 dur-
ing the cooling cycle.
IF REPLACEMENT PARTS ARE NEEDED
When parts are needed, refer to boiler model and serial num-
ber shown on the boiler name/rating plate. Refer to publication
number S-11PL 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/ in.
Relief/Safety valves must be ASME rated for the pressure and
gross output of the boiler.
or replacement parts, heating contractors should contact their
Slant/ in boiler distributor.

19
Sentry
(a) Seal any unused openings in the common venting system.
(b) Visually inspect the venting system for proper size and hor-
izontal pitch and determine there is no blockage or restric-
tion, 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 vent-
ing 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 fire-
place dampers.
(d) Place in operation the appliance being inspected. ollow 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
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.
(g) Any improper operation of the common venting system
should be corrected so the installation conforms with the
National uel 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 uel Gas Code, ANSI Z223.1-
latest edition.
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
are not in operation."

SLANT/FIN C RP RATI N, Greenvale, N.Y. 11548 • Phone: [phone]
FAX: [phone] •Canada: Slant/Fin LTD/LTEE, Mississauga, Ontario
www.slantfin.com
©Slant/ in Corp. 2012. Printed in the U.S.A. 812. Publication No. S-41. P/N 46-0602