GB250-IM-5
42-9185
GB250 SERIES
INSTALLATION, OPERATION
& MAINTENANCE MANUAL
AND REPLACEMENT PARTS LIST
Gas-Fired Steam Cast Iron Boilers
175,000 to 400,000 Btuh Input
Standing Pilot, Standing Pilot & Vent Damper,
Intermittent Pilot, Intermittent Pilot & Vent
Damper
SECTION 1: INTRODUCTION
Step 6: Wiring Boiler ..............................................11
Code Compliance. ....................................................2
Venting Requirements ..............................................3
Chimney Requirements ............................................3
Combustion Air Requirements ..................................3
Water Treatment........................................................4
Shipment of Boiler ....................................................4
SECTION 3: START-UP & OPERATION
Sequence Of Operation ..........................................16
Prior To Start-Up ....................................................16
Start-Up & Adjustments ..........................................16
SECTION 4: MAINTENANCE
SECTION 2: BOILER INSTALLATION
Before Each Heating Season..................................19
How To Change Orifices ........................................20
Heating System Problems & Causes......................20
Replacement Parts List ..........................................21
Warnings ................................................................25
Step 1: Locating/Setting Boiler..................................5
Step 2: Installing Steam Piping ................................6
Step 3: Installing Hydronic Components ..................7
Step 4: Venting Boiler................................................7
Step 5: Installing/Testing Gas Piping ......................10
WESTCAST, INC.
260 NORTH ELM STREET WESTFIELD, MA 01085
TEL. (413) 562-9631 FAX (413) 562-3799
7. Any improper operation of the common venting sys-
tem should be corrected so the installation conforms
with 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 Z223.1-latest edition.
For Canada, the provisions of B149.1 and B149.2 shall
apply.
VENTING REQUIREMENTS
When connecting to gas vents or chimneys, vent instal-
lations shall be in accordance with Part 7, Venting of
Equipment, of the National Fuel Gas Code, ANSI
Z223.1-latest edition, or applicable provisions of the
local building codes. For Canada, the provisions of
B149.1 and B149.2 shall apply.
Vent connectors serving appliances vented by natural
draft shall not be connected into any portion of mechani-
cal draft systems operating under positive pressure.
DANGER: A chimney which does not meet modern
safety standards will result in a fire or deadly carbon
monoxide poisoning of the building residents.
When two or more appliances vent into a common flue,
the area of the common flue should be at least equal to
the area of the largest flue plus 50% of the areas of the
additional flue or vent connectors.
CHIMNEY REQUIREMENTS
Chimney condition is of paramount importance for a
safe and efficient boiler installation. All new and replace-
ment installations must include a chimney inspection by
a qualified individual or agency. Chimney construction
materials must be compatible with the fuel being used.
When an existing boiler is removed from common
venting system, common venting system is likely to be
too large for proper venting of appliances remaining
connected to it. At time of removal of existing boiler, the
following steps shall be followed with each appliance
remaining connected to the common venting system
placed in operation, while other appliances remaining
connected to the common venting system are not in
operation:
Particular attention should be paid on all oil-to-gas con-
versions. Soot may have accumulated in chimney and/or
degraded chimney liner. Most utilities require complete
chimney cleaning. Others may require installation of new
liner, spill switches or other chimney upgrades. Check
with local utility for required safety precautions.
1. Seal all unused openings in common venting system.
2. Visually inspect the venting system for proper size
and horizontal pitch and determine there is no blockage
or restriction, leakage, corrosion and other deficiencies
which could cause an unsafe condition.
COMBUSTION AIR REQUIREMENTS
Provisions for combustion air must be in accordance
with the National Fuel Gas Code ANSI Z223.1 - latest
edition, as well as all applicable local codes. If the boiler
is installed in an unconfined space, adequate air will be
available via normal infiltration. However, if building
construction is unusually tight or the boiler is installed in
a confined space (a space whose volume is less than 50
cubic feet per 1000 Btu/hr of gas input for all fuel
burning equipment), adequate air for combustion must
be provided by two openings: one located about 6”
below the ceiling, the other about 6” above the floor.
When communicating directly with the outside or
through a vertical duct, each opening must have a
minimum free area of one square inch per 4000 Btu/hr
of gas input. Horizontal ducts to the outside must have a
minimum free area of one square inch per 2000 Btu/hr
of gas input. When ventilation is provided by openings in
doors, etc. to adjoining spaces having adequate
infiltration, each opening must have a minimum free
area of one square inch per 1000 Btu/hr of gas input.
3. Insofar as is practical, close all building doors and
windows and all doors between the space in which the
appliances remaining connected to the common venting
system are located and other spaces of the building.
Turn on clothes dryers and any appliance not connected
to the common venting system. Turn on any exhaust
fans, such as range hoods and bathroom exhausts, so
they will operate at maximum speed. Do not operate a
summer exhaust fan. Close fireplace dampers.
4. Place in operation the appliance being inspected. Fo-
llow the lighting instructions. Adjust thermostat so
appliance will operate continuously.
5. Test for spillage at draft hood relief opening after 5
minutes of main burner operation. Use the flame of a
match or candle, or smoke from cigarette, cigar or pipe.
6. After it has been determined that each appliance
remaining connected to common venting system proper-
ly vents when tested as outlined above, return doors,
windows, exhaust fans, fireplace dampers and any other
gas-burning appliance to previous conditions of use.
3
NOTE: Boiler utilizes synthetic rubber seals. Water
treatment chemicals and system cleaning chemicals
must be compatible with this and all other
construction materials.
WARNING: Adequate fresh air must be provided for
combustion. Improper boiler operation and
inadequate venting of deadly flue gases may
otherwise result.
NOTE: Boiler employs atmospheric combustion.
Combustion air must not be contaminated with
halogenated hydrocarbon vapors, aerosol
propellants or freon. Otherwise, boiler heat
exchanger will be subject to corrosion, reducing
boiler life.
SHIPMENT OF BOILER
Each boiler is shipped in a single carton. Draft hood is
shipped in a separate carton on larger models.
Optional Vent Damper
When ordered, the vent damper is shipped in an
individual carton packaged with the boiler. Mounting of
the damper is required.
WATER TREATMENT
Water treatment is recommended in areas where water
quality is a problem. A local water treatment company
should be consulted to determine the requirements for
your particular system and locality.
WARNING: Installers must follow local regulations
with respect to the installation of CO detectors and
follow the manufacturer’s stated maintenance
schedule for this boiler!
NOTE: Boiler is not for use in systems where water
is replenished. Minerals in the water can build up on
the heat transfer surfaces and cause overheating
and subsequent failure of the heat exchanger.
ATTENTION: Observer les règlements règional à
l’egard des détecteurs de monoxyde de carbone et
observer entretien de manufacturier pour cette
chaudière!
4
SECTION 2: BOILER INSTALLATION
STEP 1: LOCATING AND SETTING THE BOILER
➤PROCEDURE A: Check that provisions for combustion air are in accordance with National Fuel Gas
Code ANSI Z223.1-latest edition and all applicable local codes. In Canada, follow CAN/CGA B149(.1 or .2)
installation codes.
FIGURE 2.1
➤PROCEDURE B:
Check minimum
clearances to
6"
6"
combustibles are
proper as shown. Local
requirements may
specify greater
VENT DAMPER
* TOP
clearances & must be
adhered to.
1
1
1
1
1
1
1
1
1
1
1
1
1
Boiler shall be install-
ed such that the gas
ignition system com-
ponents are protected
from water (dripping,
spraying, rain, etc.)
during appliance oper-
ation and service.
18"
12"
12"
RECOMMEND
MORE FOR
ACCESS TO
VENT DAMPER
POSITION
INDICATOR
* 52" FOR GB250-S-5L THRU GB250 S-7
58" FOR GB250-S-8 THRU GB250-S-9
WARNING: Never install boiler on combustible flooring without combustible flooring pan or on carpeting
as heat damage and/or fire may result.
CAUTION: Locate boiler so horizontal connecting flue pipe is as short as possible. Maximize height of
vertical flue connector.
NOTE: Do not loosen tie rods on absorption unit. They accommodate thermal expansion. Loss of boiler
structural integrity and water leaks/damage may result.
Step 1 Continued On Next Page
5
➤PROCEDURE C:
Check component positioning.
1. Remove all packing material
from boiler.
2. Install on non-combustible floor
only, unless local codes permit
use and fabrication of a fireproof
base (see Fig. 2.2).
3. Check that burners and controls
are in the proper position.
6" OVERHANG OF BLOCK AND
SHEETMETAL ALL AROUND
4" HOLLOW CLAY TILE (TWO
COURSES) OPENINGS THRU
BLOCKS IN TOP COURSE TO
BE AT 900 ANGLE TO OPENINGS
THRU BOTTOM COURSE
22 GAUGE
SHEETMETAL
6"
FLOOR
FIGURE 2.2
STEP 2: INSTALLING STEAM PIPING
Typical piping connections are shown in Figure 2.3. All
external piping must be supported by hangers, not by
the boiler or its accessories.
Proper steam piping practices must be followed at all
times. Maintain proper clearances between piping and
combustible material.
Supply outlet must run full size from boiler to a header at
least 24" above top of boiler. Condensate return piping
should be connected to boiler through a "Hartford Loop."
Install gate valves in supply and return.
The supply and return lines should be equipped with
drain cocks to drain sediment and sludge from lowest
points of boiler.
STEAM
SUPPLY
GATE VALVE
SUPPLY
TAPPING
3" NPT
MUST BE CLOSE
NIPPLE
24" MIN.
HARTFORD
LOOP
RETURN
TAPPING
2" NPT
GATE
VALVE
WATER LINE
C/L OF HARTFORD
LOOP TO BE 2"
BELOW WATER
LINE
23-1/4"
DRAIN
COCKS
FIGURE 2.3
6
STEP 3: INSTALLING HYDRONIC COMPONENTS
A low-water cutoff must be installed to protect the unit
from dry-fire.
PRESSURE
RELIEF VALVE
Screw extension nipple into 3/4" tapping on top of the
absorption unit and install relief valve into top of nipple
with the spindle in the vertical position (i.e., with the
valve discharge in the horizontal)(See Figure 2.4).
WARNING: No Valve of any type may be installed
between the boiler and the relief valve to prevent
accidental explosion from overpressure.
Most localities require the discharge piping to terminate
within 6" of the floor. Check local code requirements if in
doubt. Discharge piping must be of same size or larger
than the relief valve outlet and should be run as short
and straight as possible. Elbows in the discharge piping
should be placed as close to the valve as possible. If
valve discharge is to be drained away, the discharge
piping must not be hard-piped to the drain piping (i.e.,
an open funnel or similar arrangement must be used).
PRESSURE RELIEF
VALVE DISCHARGE
PIPING
FIGURE 2.4
CAUTION: Piping must be installed from the relief
valve discharge so there will be no danger of
scalding personnel.
STEP 4: VENTING BOILER
DANGER: Drafthood, vent outlet and vent damper as
supplied must not be altered in any was as proper
boiler operation would be jeopardized. Flame
rollout, fire or carbon monoxide poisoning will
result.
INSTALL
SWITCH
IN OPENING
ON DRAFTHOOD
INSTALL
MOUNTING
BRACKET
CONNECT
WIRE
LEADS
ON DRAFTHOOD
Install draft hood on boiler. If the draft hood shroud has a
hole near the relief opening for installing a spill switch,
mount draft hood so the hole faces to the front of the
boiler. Spill switches are provided on Model GB250-5L,
GB250-5H, and GB250-6 boilers.
Applicable boiler is equipped with a factory-mounted
spill switch harness/mounting bracket assembly; spill
switch is provided in plastic bag. See Figure 2.5. Install
mounting bracket on outside surface of draft hood
shroud with screws provided (HARNESS MUST BE ON
OUTSIDE OF SHROUD). Install spill switch in hole in
shroud (on outside surface) with screws provided. Plug
wiring leads from harness/bracket assembly onto flat
terminals on spill switch.
FIGURE 2.5
If vent damper is supplied with boiler, it must be installed
between the top of the draft hood and the flue pipe. See
“Installing The Vent Damper” instructions.
Connect draft hood to chimney or Class B vent. Flue
pipe must be same diameter as the draft hood outlet.
NOTE: Boiler will not operate unless wiring leads to
spill switch are connected.
7
The flue or vent connectors must be installed flush with
the inside chimney liner surface and sealed in place with
furnace cement. Horizontal portions of the single wall
and type B venting systems shall be supported by use
of strap hangers or their equivalent. Vent supports
should be placed a maximum of 15-feet apart and as
required to prevent sagging. The vent connectors shall
be pitched 1/4" per foot upwards towards the chimney or
vent termination.
Remove hairpin shipping clip which holds damper blade
in closed position and observe that damper blade
rotates slowly to open position. Do not force it closed as
it may damage the gear train and void the warranty. The
blade should move freely and without obstruction.
Secure the vent damper housing to the drafthood outlet
with sheet metal screws or pop rivets. Refer to Figure
2.8 for fastener locations. Install flue pipe over top of
vent damper and secure to damper housing with sheet
metal screws or pop rivets.
DANGER: Only the boiler may be served by the vent
damper. Do not attempt to use it to vent an
additional appliance. This will cause fire or carbon
monoxide poisoning.
Attach vent damper cable to cable clamp on boiler left
panel and join the Molex connector (see Figure 2.6 or
Figure 2.6A).
Installing Vent Damper
The vent damper must be mounted directly on top of the
draft hood.
FLOW DIRECTION
ARROW POINTS UP
Locate the motor on the front side and position the cable
so that it does not touch the metal surface of the
drafthood (see Figure 2.6). If necessary, turn angle
connector on vent damper upward until cable clears;
tighten locknut to secure.The direction of the flow arrow
imprinted on the vent damper must point upward. The
damper position indicator, which is located on the side
of the vent damper opposite the motor, must be visible.
MAKE SURE
MOTOR IS
LOCATED ON
FRONT SIDE
MOUNT VENT
DAMPER OVER
DRAFTHOOD
FIGURE 2.7
CAUTION: A minimum of 6" between vent damper
and combustible materials must be maintained. The
vent damper must be accessible for servicing and
checking position indicator.
PRESSURE
PRESSURE
VENT DAMPER
CONTROL
VENT DAMPER
CONTROL
DRAFTHOOD
THERMOSTAT
DRAFTHOOD
THERMOSTAT
CONNECTION
CONNECTION
CABLE
CABLE
BRACKET
BRACKET
TRANSFORMER
PILOT CONTROL
TRANSFORMER
GAS VALVE
THERMOSTAT CONNECTION
THERMOSTAT CONNECTION
FIGURE 2.6: Vent Damper Installation for Intermittent Pilot
FIGURE 2.6A: Vent Damper Installation for Standing Pilot
8
of the largest flue plus 50% of the areas of the additional flue
or vent connectors.
ATTACH LOWER
PORTION OF
VENT DAMPER
TO DRAFTHOOD
OUTLET WITH 1/2"
OR SHORTER
SCREWS OR
When an existing boiler is removed from a common venting
system, common venting system is likely to be too large for
proper venting of appliances remaining connected to it. At time
of removal of existing boiler, following steps shall be followed
with each appliance remaining connected to the common
venting system placed in operation, while other appliances
remaining connected to common venting system are not in
operation:
POP RIVETS
1. Seal all unused openings in common venting system.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion and other deficiencies which
could cause an unsafe condition.
FIGURE 2.8
➤PROCEDURE C: Install flue pipe between vent
damper and chimney (6" minimum clearance
required between flue pipe and combustibles).
3. Insofar as is practical, close all building doors and windows
and all doors between the space in which the appliances
remaining connected to the common venting system are
located and other spaces of the building. Turn on clothes
dryers and any appliance not connected to the common
venting system. Turn on any exhaust fans, such as range
hoods and bathroom exhausts, so they will operate at
maximum speed. Do not operate a summer exhaust fan. Close
fireplace dampers.
USE VENT SUPPORT(S) AS REQUIRED TO PREVENT SAGGING
MAXIMUM
6 FT.
APART
SINGLE WALL
OR TYPE B
FLUE PIPE
4. Place in operation the appliance being inspected. Follow the
lighting instructions. Adjust thermostat so appliance will
operate continuously.
PITCH 1/4" PER FOOT
5. Test for spillage at draft hood relief opening after 5 minutes
of main burner operation. Use the flame of a match or candle,
or smoke from cigarette, cigar or pipe.
6. After it has been determined that each appliance remaining
connected to common venting system properly vents when
tested as outlined above, return doors, windows, exhaust fans,
fireplace dampers and any other gas burning appliance to
previous conditions of use.
SECURE
FLUE PIPE
TO VENT
DAMPER
INSTALL
FLUSH
WITH
CHIMNEY
LINER
SEAL
WITH
FURNACE
CEMENT
7. Any improper operation of the common venting system
should be corrected so 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 Z223.1-latest edition. For
Canada, the provisions of CAN/CGA B149(.1 or .2) shall apply.
ADDITIONAL CHIMNEY REQUIREMENTS: Chimney
condition is of paramount importance for a safe and efficient
boiler installation. All installations must include a chimney
inspection by a qualified individual or agency. Chimney
construction materials must be compatible with the fuel being
used.
FIGURE 2.9
ADDITIONAL VENTING REQUIREMENTS: When connecting
to gas vents or chimneys, vent installations shall be in
accordance with Part 7, Venting of Equipment, of the National
Fuel Gas Code, ANSI Z223.1-latest edition, or applicable
provisions of the local building codes.
Particular attention should be paid on all oil-to-gas
conversions.Soot may have accumulated in chimney and/or
degraded chimney liner. Most utilities require complete
chimney cleaning. Others may require installation of new liner,
spill switches or other chimney upgrades. Check with local
Vent connectors serving appliances vented by natural draft
shall not be connected into any portion of mechanical draft
systems operating under positive pressure.
utility for required safety precautions.
DANGER: A chimney which does not meet modern
safety standards will result in a fire or deadly carbon
monoxide poisoning of the building residents.
When two or more appliances vent into a common flue, the
area of the common flue should be at least equal to the area
9
STEP 5: INSTALLING & TESTING GAS PIPING
Connect the gas piping from the meter to the boiler
Install a full-sized sediment trap at the low point in gas
line upstream of gas valve. Install a non-restrictive
lubricated plug valve in the gas line close to the boiler.
Install a ground joint union at the gas valve inlet to allow
for servicing. Check local codes and utilities for any
special requirements and procedures.
using a pipe size which will result in a pressure drop of
less than 0.3" W.C. for natural gas or 0.5" W.C. for
propane. See Figure 2.10 for the appropriate gas pipe
sizing and example.
Good piping practices should be followed at all times.
See Figure 2.11 for a typical gas piping arrangement. All
piping must be supported by hangers, not by the boiler
or its accessories.
Pipe joint compound (pipe dope) must be compatible
with the fuel (natural gas or propane) being used.
Maximum Capacity of Pipe in Cubic Feet of Natural Gas per Hour for Gas Pressures of
0.5 Psig or Less and a Pressure Drop of 0.3 Inch Water Column
(Based on a 0.60 Specific Gravity Gas)
Nominal
Iron Pipe
Size,
Length of Pipe, Feet
Internal
Diameter,
Inches
90
100
125
175
150
200
10
20
30
40
50
60
70
80
Inches
1/4"
3/8"
1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
22
49
92
18
40
73
32
72
15
34
63
14
30
56
12
27
11
25
46
96
11
23
10
22
40
84
9
21
38
79
8
18
34
72
130
275
410
8
17
7
15
28
59
6
14
26
55
.326
.493
.622
.824
1.049
1.380
1.610
2.067
2.469
3.026
4.026
132
50
43
31
278
520
1,050
1,600
3,050
4,800
8,500
130 115
245 215
500 440
760 670
105
90
170
350
530
990
64
120
250
380
710
190 152
350 285
730 590
1,100 890
2,100 1,650
3,300 2,700
5,900 4,700
195 180
400 370
600 560
160 150
320 305
490 460
930 870
110 100
225 210
350 320
650 610
1,450 1,270 1,150 1,500
780
2-1/2"
3"
4"
2,300 2,000 1,850 1,700 1,600 1,500 1,400 1,250 1,130 1,050 980
4,100 3,600 3,250 3,000 2,800 2,600 2,500 2,200 2,000 1,850 1,700
8,300 7,400 6,800 6,200 5,800 5,400 5,100
17,500 12,000
4,100 3,800 3,500
4,500
9,700
Maximum Capacity of Pipe in Thousands of Btu per Hour of Undiluted Liquefied
Petroleum Gases (at 11 Inches Water Column Inlet Pressure)
(Based on a Pressure Drop of 0.5 Inch Water Column)
Nominal
Iron Pipe
Size,
Length of Pipe, Feet
90
100
125
150
10
20
30
40
50
60
70
80
Inches
275
567
1071
189 152
393 315
732 590
129 114
267 237
504 448
103
96
89
185
346
724
83
78
69
146
275
567
866
63
132
252
511
787
1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
217 196
409 378
834 771
173 162
322 307
677 630
2205 1496 1212 1039 937
3307 2299 1858 1559 1417 1275 1180 1086 1023 967
6221 4331 3465 2992 2646 2394 2205 2047 1921 1811 1606 1498
Example: Boiler Model GB250-7 is to be installed. The distance from the existing gas meter installation site is 20 feet. What
pipe size must be used? The local utility indicates the heating value of the natural gas being supplied is 1,000 Btu per cubic
foot. Determine the cubic feet of gas per hour for above boiler model:
300,000 Btu per hour
1,000 Btu per cu. ft.
=
300 cu. ft. per hour
1. Find 20 ft. in the upper portion of the table for natural gas under Length of Pipe, Feet heading.
2. Moving down the column, match the required capacity. The higher capacity is acceptable. In our case, it is 350 cu. ft.
3. Move to the left-hand column Nominal Iron Pipe Size, Inches to read required pipe size. In our case, it is 1".
FIGURE 2.10
10
Testing Gas Piping
RISER TO OTHER
APPLIANCES
BEAM
DANGER: Before placing gas piping into service,
carefully test it to assure every joint is gas tight.
Bubble test all joints with a soap solution. NEVER
TEST WITH AN OPEN FLAME AS FIRE OR
EXPLOSION WILL RESULT.
PIPE CLAMP
GAS
MANUAL MAIN
SHUT OFF
VALVE
METER
For any pressure testing in excess of 1/2 psi, the boiler
and its individual shutoff valve must be isolated from the
piping system by disconnecting them and capping the
outlet(s). For any pressure testing equal to or less than
1/2 psi, the boiler must be isolated from the piping
system by closing its manual shutoff valve.
FIGURE 2.11
UNION
GAS
VALVE
Minimum pressure required at the gas valve inlet is 5"
W.C. for natural gas and 11" W.C. for propane.
Maximum pressure allowable at the gas valve inlet is 12"
W.C. If the gas pressure is above these limits, a
pressure regulator must be installed. If the gas pressure
is below these limits, contact the local utility.
SEDIMENT
TRAP
STEP 6: WIRING THE BOILER
WARNING: Turn off electrical power supply before
servicing. Contact with live electric components can
cause electric shock or death.
the primary pressuretrol when facing the front of the
boiler). Connect wiring assemblies (provided on boiler)
from the low water cut-off or transformer to the primary
pressure control and from the gas valve to the
secondary pressure control as shown in Fig. 2.12. Do
not readjust the secondary pressuretrol; its purpose
is to interrupt thermocouple power to the gas valve in
case the primary pressuretrol fails to function.
All electrical and control wiring must be installed in ac-
cordance with the codes listed in Section 1 of this
manual. Follow the wiring diagram for your particular
installation as shown in Figures 2.13 through 2.18.
GB250-8 and GB250-9 natural gas standing pilot units
have a secondary pressuretrol (located to the right of
FOR FIELD
FOR FIELD
FOR FIELD
FOR FIELD
CONNECTION
TO PRIMARY
PRESSURE
CONTROL
CONNECTION
TO PRIMARY
PRESSURE
CONTROL
CONNECTION
TO SECONDARY
PRESSURE
CONNECTION
TO SECONDARY
PRESSURE
CONTROL
(ON THE RIGHT)
CONTROL
(ON THE RIGHT)
(ON THE LEFT)
(ON THE LEFT)
WIRE
ASS'Y.
WIRE
ASS'Y.
WIRE
ASS'Y.
WIRE
ASS'Y.
400 SERIES
OR M & M
PS804 LWCO
TRANSFORMER
TRANSFORMER
GAS
VALVE
GAS
VALVE
FOR BOILERS EQUIPPED WITH
400 SERIES OR M&M PS804
FOR BOILERS EQUIPPED WITH
MCDONNELL-MILLER LWCO
FIGURE 2.12
FOR BOILERS EQUIPPED
400 SERIES OR M & M PS804 LWCO
FOR BOILERS EQUIPPED WITH
MCDONNELL-MILLER LWCO
11
For vent damper-equipped models, connect thermostat
to blue leads (see Figure 2.6).
NOTE: Boiler transformer must not be used to
power external accessories (i.e., zone valves,
relays, etc.) Otherwise, transformer will be
overloaded and burn out.
NOTE: If any of original wire supplied with boiler
must be replaced, use similar wire of 105° C rating.
Otherwise, insulation may melt or degrade,
exposing bare wire.
FIGURE 2.14: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS EQUIPPED WITH
STANDING PILOT & MCDONNELL-MILLER #67 LOW
WATER CUT-OFF (GB250-8 & GB250-9, N.G.)
FIGURE 2.13: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS WITH STANDING PILOT &
MCDONNELL-MILLER #67 LOW WATER CUT-OFF
(EXCEPT GB250-8 & GB250-9, N.G.)
12
FIGURE 2.14: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS EQUIPPED WITH
STANDING PILOT, VENT DAMPER & MCDONNELL-
MILLER #67 LOW WATER CUT-OFF (EXCEPT FOR
GB250-8 & GB250-9, N.G.)
FIGURE 2.13: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS EQUIPPED WITH
INTERMITTENT PILOT, VENT DAMPER &
MCDONNELL-MILLER #67 LOW WATER CUT-OFF
13
FIGURE 2.15: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS EQUIPPED WITH
STANDING PILOT, VENT DAMPER & MCDONNELL-
MILLER #67 LOW WATER CUT-OFF (FOR GB250-8 &
GB250-9, N.G.)
FIGURE 2.16: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS EQUIPPED WITH
INTERMITTENT PILOT, VENT DAMPER & 400
SERIES LWCO
14
FIGURE 2.17: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS EQUIPPED WITH
STANDING PILOT, VENT DAMPER & 400 SERIES
LWCO (EXCEPT FOR GB-250-8 & 9)
FIGURE 2.18: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS EQUIPPED WITH
STANDING PILOT, VENT DAMPER & 400 SERIES
LWCO (GB250-8 & 9 ONLY)
15
SECTION 3: START-UP & OPERATION
SEQUENCE OF OPERATION
PRIOR TO START-UP
For sequence of operation of the particular boiler being
installed, refer to Figures 2.13 through 2.18 in Section 2
of this manual.
Fill system with water until the water level indicator
(sight glass) is approximately 2/3 full. This water level is
23" from the surface on which the boiler sits.
Spill and rollout switches are mounted on Model
GB250-5L, GB250-5H, and GB250-6 boilers.
SYSTEM START-UP & ADJUSTMENTS
Safe lighting and other performance criteria were met
with the gas manifold and control assembly provided on
the boiler when the boiler underwent tests specified in
ANSI Z21.13.
For boilers with a spill switch, the switch detects the
escape of combustion products through the draft
diverter relief opening and interrupts the power to the
gas valve preventing unsafe boiler operation. Escape of
flue products could be caused by a blocked or collapsed
chimney or inadequate chimney draft. This is a manual
reset-type device and can be reactivated by depressing
the spill switch reset button mounted on the left of the
boiler’s draft hood (see Figure 2.1 for switch location).
WARNING: Keep boiler area clear and free from
combustible materials, gasoline and other
flammable vapors and liquids. Otherwise fire or
explosion may result.
1. Check combination gas valve on boiler and make
sure it is in the OFF position.
For boilers with a flame rollout switch, the switch
prevents flame rollout from the boiler combustion
chamber, caused by blocked boiler flue passageways,
by interrupting power to the gas valve to prevent unsafe
boiler operation. This is a manual reset-type device and
can be reactivated by depressing the rollout switch reset
button mounted on the lower front jacket panel. Flue
passages must be inspected by a qualified installer if
this problem occurs, prior to resetting the button.
2. For vent damper-equipped models, with the
thermostat set to call for heat, observe that vent damper
position indicator rotates to the open position. Damper
must be in the open position when appliance main
burner is operating.
a. After damper opens, spark should appear at the
pilot ignition electrodes.
b.Set thermostat to no longer call for heat. Spark
should stop. Observe that damper position indicator
rotates to the closed position.
WARNING: If boiler cannot be restored to normal
operation after re-setting of spill switch, or if flame
rollout switch has tripped, do not attempt to put the
boiler in operation. Immediately contact a qualified
service professional.
c. Set thermostat to call for heat.
3. Light the boiler. For Model GB250 boilers with
standing pilot see lighting instructions for Continuous
Pilot on page 18. For Model GB250 boilers with
intermittent pilot, see lighting instructions for Intermittent
Pilot on page 18.
PRESSURE
CONTROL
PRESSURE
RELIEF VALVE
4. Observe pilot and main burner flame (see Figure 3.2).
All burner ports should be ignited and burn with a
steady blue flame.
PRESSURE
GAUGE
FIGURE 3.2
Q3451B
Q314A/Q309A
CONSTANT PILOT
MODELS
WATER
LEVEL
INDICATOR
INTERMITTENT
IGNITION PILOT
MODELS
NORMAL PILOT FLAME
GAS VALVE
NORMAL
(HARD FLAME) (TOO MUCH AIR)
LIFTING
YELLOW
TIPPING
(MARGINAL) (TOO LITTLE AIR)
YELLOW
FLAME
FIGURE 3.1
MAIN BURNER FLAMES
16
CAUTION: Never leave the job with yellow burning Canada. Occasionally, however, local gas
flames. This condition indicated poor combustion characteristics may not allow unit to be properly
and will quickly carbonize the boiler, reducing adjusted for input. If this is the case, local utility or
efficiency and boiler life. It may also be an indication Smith may recommend orifices be changed. When
of improper venting or combustion air supply. If changing orifices follow the procedures detailed in
unable to adjust flame properly, consult your local Section 4 of this manual.
utility.
9. Start and stop burners several times by raising and
5. Boilers are shipped from the factory with the primary air
shutters on the main burner wide open. It is
recommended these air shutters be left in the wide open
position unless there is lifting of the flame above the
burner ports. If there is lifting, the air shutters should be
gradually closed until the lifting is eliminated. it may also
be necessary to adjust the primary air shutters if the input
rate is reduced by a change in the orifices.
lowering the thermostat setting.
10. After boiler has been firing long enough to raise
boiler pressure above minimum setting of the primary
pressuretol limit, check limit by turning its setting from
maximum to minimum setting. This should turn boiler
off. Return limit to desired setting. GB250-8 and
GB250-9 also have a secondary pressuretrol (located to
the right of the primary pressuretrol when facing the
front of the boiler). DO NOT READJUST THE
SECONDARY PRESSURETROL (it is factory-set and
sealed at 15 psig).
6. After burner has been in operation for about 10
minutes, check gas input rate to boiler as follows:
a. Make sure all appliances served by the meter are
turned off during timing of gas input rate to the boiler.
b. Measure the time in seconds that it takes for the
boiler to use 10 cubic feet of gas. Divide 36,000 by the
number of seconds (this is the number of cubic feet of
gas used per hour). Multiply this figure by the heating
value of the gas to obtain Btu input per hour.
11. Check boiler safety shutoff controls.
a. For boilers with standing pilot, with boiler firing,
disconnect thermocouple lead from the valve. The
valve should close.
b. For boilers with intermittent pilot, with boiler firing,
disconnect wire connected to the "PV" terminal on the
Honeywell S8600 control. The gas valve should
close.
Example: A GB250-7 boiler takes 2 minutes to use 10
cubic feet of natural gas. The local utility indicated the
heating value of the natural gas being supplied is 1000
Btu/cu ft. Therefore:
12. On initial start-up and prior to each heating season,
boiler must be cleaned (see "Steam Boiler Cleaning
Instructions" in Section 4 of this manual).
2 minutes = 120 seconds.
36,000
120
X 1000 = 300,000 Btu/hr
Therefore, the boiler input is correct.
NOTE: Before calculating the input of the heating
equipment, obtain the heating value of the gas from
the local utility.
7. If input needs to be corrected, adjust combination gas
valve pressure regulator. (Regulator is factory set at 3-
1/2" W.C. for natural gas and 10" W.C. for propane.) Turn
adjusting screw clockwise to increase gas flow (increase
input). Turn adjusting screw counterclockwise to decrease
gas flow (decrease input). In no case should final manifold
pressure setting vary more than + .3" from factory-set
pressures. If rated input cannot be obtained with
adjustment, gas supply pressure or orifice size may be
cause. Consult local utility and Smith.
8. Gas burner orifices supplied with boiler have been
carefully designed to provide correct gas input rate for
most gas conditions typically found in the U.S. and
17
WARNING:
If you do not follow these instructions exactly, a fire or explosion may result with property damage, personal injury, or loss of life.
A. BEFORE 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 IF YOU SMELL GAS
B. 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.
•
•
Do not try to light any appliance.
Do not touch any electrical switch; do not use any
phone in your building.
C. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect the
appliance and to replace any part of the control system and
any gas control which has been under water.
Follow the gas supplier's instructions.
•
If you cannot reach your gas supplier, call the fire
department.
LIGHTING CONTINUOUS PILOT INSTRUCTIONS
Standing Pilot Honeywell VR8300 and White Rodgers 36C04 - Natural or Propane Gas
This appliance has a pilot which must be lit by hand. When lighting the pilot, follow these instructions exactly.
1. STOP! Read the safety information on this page.
2. Set the thermostat to lowest setting.
9. Push down and hold the red button. Immediately light the
pilot with a match.
3. Turn off all electric power to the appliance.
4. Turn gas control knob clockwise to "OFF".
(For WR-36C04) Push in gas control slightly and turn
clockwise to "OFF" unless knob is pushed in slightly. Do not
force.
5. Wait five (5) minutes to clear out any gas. Then smell for
gas, including near the floor. If you then smell gas, STOP!
Follow "A" in the safety information above. If you don't smell
gas, go to the next step.
Continue to hold the red button down for about one (1) minute
after the pilot is lit.
Release button and it will pop back up. Pilot should remain lit.
If it goes out, repeat steps 4 through 9.
•
If button does not pop up when released, stop
immediately and 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.
6. Remove the base door covering the top of the burners
and enclosing the pilot.
7. Find pilot - Follow metal tube from gas control. The pilot
is between the central burner tubes behind the base door.
8. Turn knob on gas control counterclockwise to "Pilot".
10. Replace the base door.
11. Turn gas control knob counterclockwise to "ON".
12. Turn on all electric power to the appliance.
13. Set thermostat to desired setting.
INLET
OFF
GAS
GAS
ON
ON
OFF
INLET
PILOT
GAS CONTROL KNOB
GAS CONTROL KNOB
SHOWN IN "OFF" POSITION
SHOWN IN "ON" POSITION
RESET BUTTON
Honeywell VR8300
WR-36C04
OPERATING INSTRUCTIONS
Intermittent Ignition White Rodgers 36C74/Honeywell VR8304
1. STOP! Read the safety information on this page.
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.
INLET
GAS
OFF
ON
5. Turn gas control knob clockwise to "OFF".
6. Wait five (5) minutes to clear out any gas. Then
smell for gas, including near the floor. If you then smell
gas, STOP! Follow "A" in the safety information on page
18. If you don't smell gas, go to next step.
7. Turn gas control knob counterclockwise to "ON".
8. Turn on all electric power to the appliance.
9. Set the thermostat to the desired setting.
10. If the appliance will not operate, follow the instructions "To
Turn Off Appliance" and call your service technician or
gas supplier.
GAS CONTROL KNOB
SHOWN IN "ON" POSITION
WR-36C74
INLET
GAS
ON
OFF
GAS CONTROL KNOB
SHOWN IN "OFF" POSITION
Honeywell VR8304
18
TO TURN OFF APPLIANCE
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance if service is to be performed.
3. Turn gas control knob counterclockwise to "OFF". Do not force.
SECTION 4: MAINTENANCE
This boiler has been designed to provide years of
trouble free performance in normal installations.
Examination by the homeowner at the beginning of each
heating season, and in mid-heating season, should
assure continued good performance. In addition, the
boiler should be examined by a qualified service
professional at least once every year.
3. Check and clean burner assembly. Remove burner
access panel. Lift burners up and to rear until burners
are disengaged from orifices. Brush top of burners with
soft bristle brush and blow out with air or vacuum.
4. Check gas manifold for proper position and
reassemble burners to the manifold. Line up holes in
burners with the orifices, and slide assembly back into
position. BE SURE TO REINSTALL BURNERS WITH
BURNER PORTS ON THE TOP SURFACE (UPRIGHT).
DANGER:To avoid fire and explosion hazards: Do
not store anything against the boiler or allow dirt or
debris to accumulate in the area immediately
surrounding the boiler. Keep boiler area clear and
free from combustible materials, gasoline and other
flammable vapors and liquids. Lint, paper or rags
must not be allowed to accumulate near the burners.
Do not place clothing on boiler to dry.
5. When a low water cut-off has been utilized, follow the
manufacturer’s maintenance instructions. As a
minimum, test the operation of electronic controls at
least once a year. Remove, clean and inspect the probe.
If the LWCO fails to operate properly it must be
replaced. Float type controls should be flushed once a
month during the heating season.
NOTE: Do not draw water from heating system for
cleaning. Minerals in the water can build up on the
heat transfer surfaces and cause overheating and
subsequent failure of the cast iron sections.
6. Follow "System Start-Up & Adjustments" procedures
in Section 3 of this manual.
NOTE: Do not obstruct the flow of combustion and
ventilation air.
Steam Boiler Cleaning Instructions
The following procedures must be followed on initial
start-up and if the presence of sediment, sludge or
impurities hamper proper boiler operations.
NOTE: If boiler is equipped with a low water cutoff,
follow manufacturer's maintenance instructions.
1. With gate valves closed on supply and return lines,
start burner and allow boiler to become pressurized so
that the pressuretrol may be adjusted and set for limit
cut-off desired (normally about 3 psi). Turn off burner
and allow pressure to drop to 0 psi., then proceed with
the following cleaning procedure.
BEFORE EACH HEATING SEASON
1. Remove and inspect draft hood and vent piping
(connecting draft hood to chimney or vent) for
obstructions, soot accumulation, rust or corrosion. Clean
and replace as necessary. Check tightness of joints;
seal all joints where necessary.
2. Remove the pressure relief valve.
2. Check boiler flue passageways in the boiler sections
for any blockage or soot accumulation. Remove draft
hood, jacket top and flue collector. Using a flashlight,
examine all flue passageways.
3. Add caustic soda (lewis lye) through this opening at
the rate of one pound per thousand square feet of
radiation capacity. Scout, Squirk or similar steam boiler
cleaners may be used instead of lye. Trisodium
phosphate (1/4#) is also an excellent cleaner.
a. If passageways are free of soot and obstructions,
replace flue collector and seal with furnace cement.
4. Provide pipe connection (full size) from pressure relief
valve opening to a convenient drain to serve as a vent.
b. If passageways need cleaning, remove burners as
described in paragraph 3 below. Insert long-handle
bristle flue brush down between section tubes and
upward through sections from combustion chamber in
both diagonal directions to remove carbon from
finned surfaces. Vacuum debris. Replace flue
collector and seal with furnace cement.
5. Fill the boiler with a manual fill valve until water starts
to trickle from this pipe.
6. Fireboiler at sufficient rate to generate and maintain
steam. Entrained water and impurities will then discharge
(with steam) from open vent. Add water as necessary so
that the low water cutoff does not shut off burner.
c. Reinstall jacket top panel and draft hood.
19
7. Continue this process for a minimum of one hour.
The process should continue until the steam is dry (no
water coming from the vent when the water in the gauge
glass is at a normal level, approximately 2/3 full). The
time required could vary up to 3 hours.
HEATING SYSTEM PROBLEMS & CAUSES
No Heat
1. Blown fuse or circuit breaker.
2. Switch turned off.
3. Pilot outage
4. IID system malfunction.
5. Flue damper not open.
6. Water level too low.
8. Turn burner to off position. While boiler is still hot,
drain completely through boiler drain. Make sure that all
low points in the return line are also completely drained.
These areas could trap chemicals and dirt.
Insufficient Heat
1. Incorrect thermostat anticipator setting.
2. Low pressuretrol setting.
3. Boiler undersized or underfired.
4. Insufficient radiation.
9. Close boiler drain and refill with clean untreated warm
water. If warm water is not used, fill very slowly so as
not to crack boiler sections. Fill until water overflows
through vent pipe and runs clear.
10. Completely drain boiler again.Refill with clean
untreated water to normal level.
Odor, Excessive Moisture In Building
1. Leak in piping.
2. Carbon build-up in flueways.
3. Blocked chimney.
11. Remove vent drain piping and reinstall pressure
relief valve. Open gate valves on supply and return
lines. Turn on burner. System is now ready to operate.
Yellow Flame, Carbon Build-Up
1. Unit overfired.
2. Air shutter misadjustment.
3. Wrong orifices.
HOW TO CHANGE ORIFICES
1. Shut off power supply and gas supply to the boiler.
4. Burning in burner mixing tube.
2. Remove burner access panel. Lift burners up and to
rear until burners are disengaged from orifices.
Noise
1. Ignition or ignition noise due to incorrect air shutter
adjustment.
2. Whistle due to burr on orifices.
3. Burner "fluting" due to air shutter opening too wide.
3. Check orifices for proper drill size. Size is stamped
onto the body of the brass orifice (see Figure 4.1). Size
can also be checked by using a pin gauge.
4. All orifices are screwed into the manifold and may be
removed by using a 5/8" wrench or socket.
Overheating
1. Wrong thermostat anticipator setting.
2. Bad thermostat location.
3. Bad thermostat.
5. Reverse procedures above to install orifices and
burners. BE SURE TO REINSTALL BURNERS WITH
BURNER PORTS ON TOP SURFACE (UPRIGHT).
FIGURE 4.1
Boiler
Model
GB250-5L GB250-5H GB250-6 GB250-7 GB250-8 GB250-9
(1) Nat. Gas
Drill Size
34
52
32
50
31
50
33
51
32
51
32
50
(2) Prop. Gas
Drill Size
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper
and dangerous operation.
Verify proper operation after servicing.
20
MODEL GB250
SERIES
REPLACEMENT
PARTS LIST
ORDERING INFORMATION
When ordering replacement parts, provide
the model and serial number shown on the
unit rating plate as well as the part number
and name as shown in the parts list. Parts
may be obtained from your local Smith
heating contractor.
REF
GB250 GB250 GB250 GB250 GB250 GB250
NO.
NAME OF PART
PART NO.
-5L
-5H
-6
-7
-8
-9
1
Jacket - Complete
Jacket - Complete
Jacket - Complete
Jacket - Complete
Jacket - Complete
Base Pan
Base Pan
Base Pan
Base Pan
Base Pan
Burner - N.G./L.P.
Burner w/Pilot Bracket - N.G./L.P.
Base Door Ass'y
Base Door Ass'y
Base Door Ass'y
Base Door Ass'y
Base Door Ass'y
Manifold
Manifold
Manifold
Manifold
Manifold
59226
59227
59228
59229
59230
59058
59059
59060
59061
59062
59089
59091
59094
59095
59096
59097
59098
63276
59123
63278
59125
59126
59141
59142
59143
59144
59150
1
1
1
1
1
1
2
1
1
1
1
1
1
9
1
3
4
5
5
1
1
5
1
1
6
1
7
1
8
1
1
1
1
1
1
9
1
1
1
6
6
1
9
9
1
11
Burner Orifice - No. 31 (N.G.)
Burner Orifice - No. 32 (N.G.)
Burner Orifice - No. 33 (N.G.)
Burner Orifice - No. 34 (N.G.)
Burner Orifice - No. 52 (L.P.)
5
5
10
8
8
5
5
10
21
REF
NO.
GB250 GB250 GB250 GB250 GB250 GB250
NAME OF PART
PART NO.
-5L
-5H
-6
-7
-8
-9
13
14
15
16
Section, Rear
Section, Intermediate
3672
3671
3670
1
3
1
1
1
3
1
1
1
4
1
1
5
1
1
6
1
1
7
1
Section, Front (No Coll Opening)
Heat Exchanger/Assembled Block
Heat Exchanger/Assembled Block
Heat Exchanger/Assembled Block
Heat Exchanger/Assembled Block
Heat Exchanger/Assembled Block
Port Seal - 5"
72403
72404
72405
72406
72407
60306
59168
61547
50090
61684
50493
60268
59199
61980
59204
59205
59206
59207
59208
59216
59217
59218
59219
60178
40440
1
1
1
1
8
8
1
1
1
2
1
1
1
17
18
19
22
23
24
25
26
27
28
4
4
1
1
1
1
1
1
1
1
4
4
1
1
1
1
1
1
1
1
5
5
1
1
1
1
1
1
1
6
6
1
1
1
1
1
1
1
7
7
1
1
1
2
1
1
1
Port Seal - 2"
Pipe Plug 2" Sq. Hd.
Low Water Cut-Off (CG400)
Pigtail - 1/4" (CG400)
Pressuretrol (PA404A)
Press. Gauge (0-15 P.S.I.)
Water Gauge
Pressure Relief Valve - 15 P.S.I.
Flue Collector
Flue Collector
Flue Collector
Flue Collector
Flue Collector
Draft Hood - 7" For Spill Switch*
Draft Hood - 8" For Spill Switch*
Draft Hood - 8"
1
1
1
1
29
1
1
1
1
1
1
1
1
1
1
Draft Hood - 9"
1
1
1
1
31
—
Junction Box - 4"" x 4"""
Silicone Sealant 11 oz.
3/8" Fiberglass Rope - 5 Ft.
Block to Base Seal"
Vent Damper - 7" w/Harness Ass'y
Vent Damper - 8" w/Harness Ass'y
Vent Damper - 9" w/Harness Ass'y
Cable Bracket
—
60024
32
69496
69497
69498
59270
59273
59274
1
1
1
1
1
1
1
—
33
34
1
1
1
1
1
1
1
1
1
Manual Reset Spill Switch
Manual Reset Rollout Switch
Standing Pilot
6
Pilot Ass'y N.G. - Q314-3679
Pilot Ass'y N.G. - Q314-3679
Pilot Ass'y N.G. - Q314-3679
Pilot Ass'y N.G. - Q314-3679
Pilot Ass'y N.P. - Q314-3679
Pilot Ass'y L.P. - Q314-3679
Pilot Ass'y L.P. - Q314-3679
Pilot Ass'y L.P. - Q314-3679
Thermocouple K16RA-36D
Thermocouple K16RA-48D
Gas Valve - N.G. VR8300C-4043
Gas Valve - N.G. WR36C04-439
Gas Valve - L.P. VR8300C-4035
Transformer - 120/24V 43VA
72366
70004
72367
72368
72369
72372
70007
72373
51006
59111
59131
59132
59133
50172
1
1
1
1
1
1
1
1
1
1
1
1
N/A
1
N/A
1
7
1
1
1
1
1
1
10
1
1
1
1
1
1
1
1
1
1
30
1
1
22
REF
NO.
GB250 GB250 GB250 GB250 GB250 GB250
NAME OF PART
PART NO.
-5L
-5H
-6
-7
-8
-9
Honeywell Intermittent Pilot System
Pilot Ass'y N.G. - Q3451B-1103
Pilot Ass'y N.G. - Q3451B-1103
Pilot Ass'y N.G. - Q3451B-1103
Pilot Ass'y N.G. - Q3451B-1103
Pilot Ass'y N.G. - Q3451B-1103
Pilot Ass'y L.P. - Q3451B-1103
Pilot Ass'y L.P. - Q3451B-1103
Pilot Ass'y L.P. - Q3451B-1103
Gas Valve - N.G. VR8304P-4332
Gas Valve - L.P. VR8304P-3340
Gas Valve - L.P VR8304P-4330
Ignition Control S8600M-1013
Ignition Cable - 36" Lg.
6
72354
70003
72355
72356
72357
72360
72361
70008
59136
59137
59138
51177
59308
50172
1
1
1
1
1
1
N/A
1
1
1
1
1
N/A
1
1
1
1
10
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
—
—
30
1
1
1
1
1
1
1
1
1
Transformer - 120/24 1006 43VA
23
JACKET ASSEMBLY
1
32
29
27
33
28
34
24
25
23
22
17
26
18
13
19
14
15
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WARNING
Any appliance that burns natural gas, propane gas, fuel oil, wood or coal is capable of producing carbon monoxide (CO).
Carbon monoxide (CO) is a gas which is odorless, colorless and tasteless but is very toxic.
If your Smith boiler is not working properly, or is not vented properly, dangerous levels of CO may accumulate. CO is lighter
than air and thus may travel throughout the building. Brief exposure to high concentrations of CO, or prolonged exposure
to lesser amounts of CO, may result in carbon monoxide poisoning.
Exposure can be fatal and exposure to high concentrations may result in the sudden onset of symptoms including
unconsciousness.
Symptoms of CO poisoning include:
dizziness
headaches
nausea
vision problems
loss of muscle control
weakness
shortness of breath
unclear thinking
unconsciousness
The symptoms of CO poisoning are often confused with those of influenza, and the highest incidence of poisoning occurs at
the onset of cold weather or during flu season. A victim may not experience any symptoms, only one symptom or a few
symptoms. Suspect the presence of carbon monoxide if symptoms tend to disappear when you leave your home.
The following signs may indicate the presence of carbon monoxide:
• Hot gases from appliance, venting system, pipes, or chimney escaping into the living space.
• Flames coming out around the appliance.
• Yellow colored flames in the appliance.
• Stale or smelly air.
• The presence of soot or carbon in or around the appliance.
• Very high unexplained humidity inside the building.
If any of the symptoms CO poisoning occur, or if any of the signs of carbon monoxide are present, vacate the premises
immediately and contact a qualfied heating service company, the gas company or the fire department.
To reduce the risk of CO poisoning, have your heating system “tuned up” by a licensed heating contractor or the gas company
- preferably before each heating season. Also have the service company check your chimney or vent pipes for blockage. Your
home should also be adequately ventilated, particularly if you have insulated your home.
Only qualified, licensed service contractors should perform work on your Smith Boiler.
WARNING
Install, operate and maintain unit in accordance with manufacturer’s instructions to avoid exposure to fuel substances or
substances from incomplete combustion which can cause death or serious illness. The State of California has determined that
these substances may cause cancer, birth defects, or other reproductive harm. Also, install and service this product to avoid
exposure to airborne particles of glasswool fibers and/or ceramic fibers known to the State of California to cause cancer
through inhalation.
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WESTCAST, INC.
260 NORTH ELM STREET WESTFIELD, MA 01085
TEL. (413) 562-9631 FAX (413) 562-3799
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