Weil-McLain | GOLD CGt SERIES | Operating instructions | Weil-McLain GOLD CGt SERIES Operating instructions

GOLD CGt
Gas-Fired Water Boiler
With Tankless Heater
Boiler Manual
• Installation • Maintenance
• Startup
• Parts
This manual must only be used by a qualified heating installer/service technician. Before installing, read all
instructions, including this manual, the burner manual and any related supplements. Perform steps in the order
given. Failure to comply could result in severe personal injury, death or substantial property damage.
DO NOT USE BOILER DURING CONSTRUCTION unless you provide dust-free air to the boiler area or
follow the requirements given on page 9. Failure to comply could result in severe personal injury, death or substantial property damage.
Part No. 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
How it works . . .
Control module
① The
control module responds to signals from the room thermo-
stat, tankless heater low limit, air pressure switch and boiler limit
circuit to operate the boiler circulator, pilot burner, gas valve and
inducer. When room thermostat calls for heat, the control module
starts the system circulator and inducer.
The control module runs the inducer long enough to purge the
boiler flue passages, then opens the pilot valve and activates pilot
ignition spark.
The control module allows up to 15 seconds to establish pilot
flame. If flame is not sensed within 15 seconds, the control module
will turn off the gas valve, flash the Flame light, and then enter a
15-second postpurge. The control module will then start a new
cycle. This will continue indefinitely until pilot flame is established
or power is interrupted. Once pilot flame is proven, the control
module opens the gas valve to allow main burner flame.
When the room thermostat is satisfied, the control module turns
off the gas valve, operates the inducer for a 15-second postpurge
and waits for the next heat call.
The control module indicator lights show normal sequence when
the lights are on steady. When a problem occurs, the control
module flashes combinations of lights to indicate the most likely
reason for the problem (see page 47).
Transformer
② The
control transformer reduces line voltage to 24 volts for the
gas valve circuit.
Inducer
③ The
inducer pulls flue gases through the boiler, causing air to be
pulled in through the boiler air openings. The inducer pushes the
flue gases through the vent pipe as well. The inducer is shipped
with gasket and 4 nuts inside a carton located inside the crate. See
Figure 36 on page 59 for proper installation of inducer.
Air pressure switch
④ The
air pressure switch signals the control module, telling the
control module whether the inducer is working correctly or the
vent is blocked.
⑤ High limit
on the boiler return piping as shown. NOTE — The
control module provides a pump exercising routine. If the
boiler is not operated for 30 days, the control module will
power the circulator for 30 seconds, then turn off.
⑦ Tankless heater low limit control
This control provides domestic priority by diverting all
available heat to domestic water heating whenever it
senses water temperature below its setting.
⑧ 3-Way valve
If the tankless heater low limit control senses boiler water
is too cool to provide domestic water from the coil, the 3way valve diverts all of the hot water flow from the boiler
back to the return, dedicating all available heat for domestic water. The 3-way valve is shipped inside the inducer
carton. You must install this valve and fittings as
shown. See pages 21 and 64 for details
Make sure the valve body is in the correct position as
shown on page 3 and Figure 39, page 62. Valve port “A”
must connect to boiler supply piping. Valve port “AB”
must connect to boiler return piping. Valve port “B” must
be used for the system return connection. This allows
water to flow normally from port “B” to port “AB” during a space heating cycle. The valve stops space heating
circuit flow and switches to full recirculation (flow from
port “A” to port “AB”) when the tankless heat low limit
control closes.
⑨ Tankless heater
The tankless heater uses hot boiler water to heat domestic
water.
Wires to ambient temp. switch
The high limit turns off the gas valve if the temperature in the
boiler goes above its setting. (The circulator will continue to run
as long as there is a call for heat.)
Boiler circulator
⑥ The
boiler circulator circulates water through the external (system)
piping. The circulator is shipped loose, and must be mounted
Install the switch and bracket supplied with the boiler on
the wall closest to the boiler, within 5 inches of the enclosure ceiling. This switch senses the ambient temperature
in the boiler space. Should boiler room temperature rise
too high due to insufficient ventilation air, the switch will
cycle the boiler off when the temperature at the switch
reaches 135°F.
Other boiler components:
a
b
c
d
e
f
supply to system
return from system
stainless steel burners
flue outlet
gas valve
pressure/temperature gauge
g
h
i
j
k
l
relief valve
air vent connection
flame rollout thermal fuse element (TFE)
burner holding bracket
pilot burner and bracket
gas manifold
m cast iron boiler sections
n flue collector
o junction box
p drain valve
q burner shield
r expansion tank line connection
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
CGt Gas-Fired Water Boiler with tankless heater
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
Contents
How it works.....................................................2–3
Hazard definitions................................................ 4
Please read before proceeding............................. 5
1 Prepare boiler location....................................6–11
2 Prepare boiler................................................12–13
3 Venting.......................................................... 14-19
4 Water piping.................................................. 20-27
5 Gas piping.......................................................... 28
6 Field wiring........................................................ 29
7 Start-up......................................................... 30-32
8 Check-out procedure.......................................... 33
9 Operation...................................................... 34-38
10 Service and maintenance.............................. 39-44
11 Troubleshooting............................................. 45-57
12 Replacement parts........................................ 58-63
13 Dimensions and ratings................................. 64-65
Hazard definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards of
various risk levels or to important information concerning the life of the product.
Indicates presence of hazards that will cause severe personal injury, death or substantial
property damage.
Indicates presence of hazards that can cause severe personal injury, death or substantial
property damage.
Indicates presence of hazards that will or can cause minor personal injury or property damage.
Indicates special instructions on installation, operation or maintenance that are important but
not related to personal injury or property damage.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
Please read before proceeding
Installer
User
Read all instructions before installing. Follow all instructions in
proper order to prevent personal
injury or death.
• Consider piping and installation when determining
boiler location.
• Any claims for damage or shortage in shipment
must be filed immediately against the transportation
company by the consignee.
heating installer/service technician.
• Please refer to the User’s Information Manual for
your reference.
• We recommend regular service by a qualified
service technician, at least annually.
The boiler contains ceramic fiber and fiberglass materials. Use care when handling these
materials per instructions on page 68 of this manual. Failure to comply could result in severe
personal injury.
When calling or writing about the boiler— Please have the boiler model number from the
boiler rating label and the CP number from the boiler jacket. You may list the CP number in
the space provided on the Installation and service certificate found on page 33.
Failure to adhere to the guidelines on this page can result in severe personal injury, death
or substantial property damage.
When servicing boiler —
• To avoid electric shock, disconnect electrical supply
before performing maintenance.
• To avoid severe burns, allow boiler to cool before
performing maintenance.
Boiler operation —
• Do not block flow of combustion or ventilation air
to boiler.
• Should overheating occur or gas supply fail to shut
off, do not turn off or disconnect electrical supply
to circulator. Instead, shut off the gas supply at a
location external to the appliance.
• Do not use this boiler if any part has been under
water. Immediately call a qualified service technician
to inspect the boiler and to replace any part of the
control system and any gas control that has been
under water.
Boiler water —
• Do not use petroleum-based cleaning or sealing
compounds in boiler system. Water seal deterioration will occur, causing leakage between sections.
This can result in substantial property damage.
• Do not use “homemade cures” or “boiler patent
medicines”. Serious damage to boiler, personnel
and/or property may result.
Part Number 550-110-290/0107
• This manual is for use only by your qualified
• Continual fresh makeup water will reduce
boiler life. Mineral buildup in sections reduces
heat transfer, overheats cast iron, and causes
section failure. Addition of oxygen and other
gases can cause internal corrosion. Leaks in
boiler or piping must be repaired at once to
prevent makeup water.
• Do not add cold water to hot boiler. Thermal
shock can cause sections to crack.
Glycol — potential fire hazard —
All glycol is flammable when exposed to high
temperatures. If glycol is allowed to accumulate
in or around the boiler or any other potential
ignition source, a fire can develop. In order to
prevent potential severe personal injury, death
or substantial property damage from fire and/or
structural damage:
• Never store glycol of any kind near the boiler
or any potential ignition source.
• Monitor and inspect the system and boiler
regularly for leakage. Repair any leaks immediately to prevent possible accumulation of
glycol.
• Never use automotive antifreeze or ethylene
glycol in the system. Using these glycols can
lead to hazardous leakage of glycol in the boiler
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
1a
Prepare boiler location — codes & checklist
Installations must
follow these codes:
• Local, state, provincial, and national
codes, laws, regulations and ordinances.
• National Fuel Gas Code, ANSI Z223.1–latest edition.
• Standard for Controls and Safety Devices
for Automatically Fired Boilers, ANSI/
ASME CSD-1, when required.
Before locating the boiler,
check the following:
• Check for nearby connection to:
• System water piping
• Venting connections
• Gas supply piping
• Electrical power
• Check area around boiler. Remove any combustible materials,
gasoline and other flammable liquids, or other contaminants.
• National Electrical Code.
• For Canada only: B149.1 or B149.2 Installation Code, CSA C22.1 Canadian Electrical Code Part 1 and any local codes.
1b
The CGt boiler gas manifold and controls met
safe lighting and other
performance criteria
when boiler underwent
tests specified in ANSI
Z21.13–latest edition.
Failure to keep boiler area clear and free of com-
bustible materials, gasoline and other flammable
liquids and vapors can result in severe personal
injury, death or substantial property damage.
• Boiler must be installed so that gas control system components are
protected from dripping or spraying water or rain during operation
or service.
• If new boiler will replace existing boiler, check for and correct system
problems, such as:
1. System leaks causing oxygen corrosion or section cracks from
hard water deposits.
2. Incorrectly-sized expansion tank.
3. Lack of antifreeze in boiler water causing system and boiler to
freeze and leak.
Install ambient temperature switch
Before placing boiler in boiler room, mount the ambient temperature switch on the wall that will be closest to the boiler as shown at
right. Mount the switch no more than 5 inches from the ceiling,
as shown. Connect the switch wires to the switch after placing the
boiler in position.
The ambient temperature switch prevents
overheating of the boiler components and
combustible materials in the vicinity of the
boiler in the event ventilation air should be
blocked. Failure to install the switch as shown
could result in severe personal injury, death or
substantial property damage.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
1c
Prepare boiler location — clearances
Recommended SERVICE clearances
Figure 2
Required MINIMUM clearances
(Fig. 1)
1. Provide clearances for cleaning and servicing the boiler and for
access to controls and components. See Figure 1 for recommendations.
2. Provide at least screwdriver clearance to jacket front panel screws
for removal of front panel for inspection and minor service. If
unable to provide at least screwdriver clearance, install unions and
shutoff valves in system so boiler can be moved for servicing.
Figure 1
Recommended
SERVICE
clearances
(see WARNING
below)
Flooring
If any clearance is less than in Figure 1, provide
openings for combustion and ventilation air
located on the wall or door opposite the boiler
FRONT (see Figure 2).
These openings must be located as shown in Figure 2 to provide
proper air flow around the boiler. The free area of each opening
(after deducting for louvers) must be at least one square inch per
1,000 Btuh of boiler input. If the building is of unusually tight
construction (see page 11 for definition), the air openings must
connect directly to outside or the building must have air openings
to the outside as specified on page 11.
If clearances are equal to or greater than Figure 1, see pages 10 and
11 for location and sizing of combustion air openings.
Failure to comply can result in severe personal injury, death or
substantial property damage and reduced boiler life.
Required MINIMUM clearances
Do not install boiler on carpeting even
if foundation is used. Fire can result,
causing severe personal injury, death
or substantial property damage.
Foundation
1. Provide a solid brick or minimum 2-inch thick concrete
foundation pad if any of the following is true:
• floor can become flooded.
• the boiler mounting area is not level.
2. Minimum dimensions are 25” long by 18” wide.
(Fig. 2)
Never install the boiler in a space with clearances less than the minimum clearances shown
in Figure 2. Failure to comply can result in severe
personal injury, death or substantial property
damage and reduced boiler life.
1. Hot water pipes: at least ¹⁄₂ inch from combustible material.
2. Single-wall vent pipe: at least 6 inches from combustible material.
3. Type B double-wall metal vent pipe: refer to vent manufacturer’s
recommendation for clearances to combustible material.
Part Number 550-110-290/0107
The CGi boiler is approved for installation on combustible
flooring, but must never be installed on carpeting.
Residential garage installations
Take the following special precautions when installing the
boiler in a residential garage. If the boiler is located in a
residential garage, per ANSI Z223.1:
• Mount the boiler a minimum of 18 inches above the
floor of the garage to assure the burner and ignition
devices will be no less than 18 inches above the floor.
• Locate or protect the boiler so it cannot be damaged
by a moving vehicle.
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
1d
Prepare boiler location — vent system
Failure to follow all instructions can result in flue gas spillage and carbon monoxide emissions, causing severe
personal injury or death.
Inspect existing chimney before installing boiler. Failure to clean or replace perforated pipe or tile lining will cause
severe personal injury or death.
Direct exhaust venting (Category III) — Do not common vent the CGt in a direct exhaust system (Category III).
Connecting more than one appliance to a direct exhaust system will cause flue gas spillage or appliance malfunction, resulting in possible severe personal injury, death or substantial property damage.
When removing boiler from an
existing common vent system:
Chimney or vent requirements
At the time of removal of an existing boiler, the following
steps shall be followed with each appliance remaining connected to the common venting system placed in operation,
while the other appliances remaining connected to the
common venting system are not in operation.
1. Venting must be installed according to Part 7,
Venting of Equipment, of National Fuel Gas
Code, ANSI Z223.1-latest edition and applicable building codes. Canadian installations
must comply with B149.1 or B149.2 Installation
Codes.
a. Seal any unused openings in the common venting
system.
b. Visually inspect the venting system for proper size
and horizontal pitch and determine there is no blockage
or restriction, leakage, corrosion or other deficiencies
which could cause an unsafe condition.
c. Test vent system — 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.
d. Place in operation the appliance being inspected.
Follow the lighting/operating instructions. Adjust
thermostat so appliance will operate continuously.
e. Test for spillage at draft hood relief opening after 5
minutes of main burner operation. Use the flame of a
match or candle.
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.
Any improper operation of common venting system should
be corrected so the installation conforms with the National
Fuel Gas Code, ANSI Z223.1-latest edition. Correct by resizing to approach the minimum size as determined using
the appropriate tables in Part 11 of that code. Canadian
installations must comply with B149.1 or B149.2 Installation Code.
2. See Ratings table on page 65 for minimum chimney or vent sizes. A chimney or vent without a
listed cap should extend at least 3 feet above
the highest point where it passes through a roof
of a building and at least 2 feet higher than
any portion of a building within a horizontal
distance of 10 feet. A chimney or vent must not
extend less than the distances stated above.
3. A lined chimney is preferred and must be used
when required by local, state, provincial and
national codes, laws, regulations and ordinances.
Vitreous tile linings with joints that prevent
retention of moisture and linings made of noncorrosive materials are best. Advice for flue connections and chimney linings can be obtained
from local gas utility. Type B double-wall metal
vent pipe or single-wall vent pipe may be used
as a liner.
4. Cold masonry chimneys, also known as outside
chimneys, typically have one or more walls exposed to outside air. When any atmospheric
gas-fired boiler with automatic vent damper
is vented through this type of chimney, the
potential exists for condensation to occur. Condensation can damage a masonry chimney. WeilMcLain recommends the following to prevent
possible damage.
a. Line chimney with corrosion-resistant
metal liner such as AL29-4C® single-wall
stainless steel or B-vent. Size liner per National Fuel Gas Code ANSI Z223.1-latest
edition.
b. Provide drain trap to remove any condensate.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
1e
Prepare boiler location — contamination
Please review the following information on potential
combustion air contamination problems.
Refer to Table 1 for products and areas which may cause
contaminated combustion air.
To prevent potential of severe personal injury or death, check for products or areas listed
below before installing boiler. If any of these contaminants are found:
• remove contaminants permanently
— OR —
• isolate boiler and provide outside combustion air. See national, provincial or local codes
for further information.
Table 1 Corrosive or destructive contaminants and likely locations
Products to avoid
Areas likely to have contaminants
Spray cans containing chloro/fluorocarbons
Dry cleaning/laundry areas and establishments
Permanent wave solutions
Swimming pools
Chlorinated waxes/cleaners
Metal fabrication plants
Chlorine-based swimming pool chemicals
Beauty shops
Calcium chloride used for thawing
Refrigeration repair shops
Sodium chloride used for water softening
Photo processing plants
Refrigerant leaks
Auto body shops
Paint or varnish removers
Plastic manufacturing plants
Hydrochloric acid/muriatic acid
Furniture refinishing areas and establishments
Cements and glues
New building construction
Antistatic fabric softeners used in clothes dryers
Remodeling areas
Chlorine-type bleaches, detergents, and cleaning
solvents found in household laundry rooms
Garages with workshops
Adhesives used to fasten building products and
other similar products
Buildings under construction (where air is
contaminated with particulates)
Airborne particulates (drywall dust, fiberglass
particles, road or gravel dust, lint, etc.)
CONSTRUCTION DUST HAZARD — Airborne particulates, such as drywall dust
or fiberglass dust, will cause blockage of the CGt burners, resulting in carbon monoxide
production, a fire hazard, or building freeze damage. If the boiler is operated during
construction, you must isolate the boiler to provide clean air for combustion. If you are
unable to ensure uncontaminated air in the boiler vicinity at all times, you must
inspect the boiler at least once weekly. When inspecting, clean the burners if necessary
using the procedure given on page 41. Failure to follow these guidelines could result in
severe personal injury, death or substantial property damage.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
1f
Prepare boiler location — air openings
✷
Combustion air opening location and sizing
requirements depend on the clearances around
the boiler. Check the boiler placement compared
to Figure 1, page 7.
Figure 3
Air openings to interior spaces
✷
If all clearances are at least equal to Figure 1,
page 7, apply the sizing and placement of openings
given on pages 10 and 11.
If ANY clearance is less than Figure 1, page 7,
you must provide air openings sized and located
as shown in Figure 2, page 7. DO NOT apply the
sizing and location information shown on page 10
or 11.
Air openings must be provided
Combustion air and ventilation openings must comply the National Fuel
Gas Code ANSI Z223.1-latest edition, or applicable local building codes.
Canadian installations must comply with B149.1 or B149.2 Installation
Codes.
Air directly through outside wall
✷
Provide adequate combustion and ventilation air to
assure proper combustion and reduce the risk of severe
personal injury, death or substantial property damage
caused by flue gas spillage and carbon monoxide
emissions.
Air opening options
Two openings — Air supply from inside the building ✷
1. If the building is of unusually tight construction (see definition, next
page), the building must also be provided with air openings directly
to the outside, sized and located per Figure 4, Figure 5 or Figure 6.
2. Buildings of typical construction should provide adequate combustion
air from natural infiltration, so additional air openings to the building
are not required.
3. See Figure 3. Provide two openings through the interior wall, within
12 inches of the ceiling and the floor, sized per Figure 3.
Two openings — Air supply directly from outside ✷
1. Air openings must be directly through an outside wall, or into a space
that connects directly to the outside (such as a ventilated attic or crawl
space, for example).
2. See Figure 4 — Openings directly through an outside wall — provide
two openings within 12 inches of the ceiling and the floor, sized per
Figure 4.
3. See Figure 5 — Air supplied through vertial ducts — provide two
openings terminated within 12 inches of the ceiling and the floor, sized
per Figure 5.
4. See Figure 6 — Air supplied through horizontal ducts — provide
two openings within 12 inches of the floor and the ceiling, sized per
Figure 6.
10
Figure 4
Figure 5
Air from outdoors — vertical ducts
✷
Figure 6
Air from outdoors — horizontal ducts
✷
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
Prepare boiler location — air openings
FREE AREA of openings — the minimum areas
given in this manual are free area (equals the area,
length times width of opening, after deduction for
louver obstruction).
Use the free area information provided by the louver manufacturer.
When this information is not available, assume:
• Wood louvers — assume free area is 20% of total; so the actual area
of each opening with wood louvers would be 5 times the required
free area.
• Metal louvers — assume free area is 60% of actual area; so, for wood
louvers, the actual area of each opening must be 1.67 times the
required free area.
Single air opening option ✷
A single combustion air opening can be used in lieu of the two-opening
options on page 10, provided:
Clearances from boiler to walls
(continued)
Unusually tight construction
Unusually tight construction means (per ANSI Z223.1)
buildings in which:
a. Walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with
a rating of 1 perm or less with openings gasketed,
and . . .
b. Weather-stripping has been added on openable
windows and doors, and . . .
c. Caulking or sealants are applied to areas such as
joints around windows and door frames, between
sole plates and floors, between wall-ceiling joints,
between wall panels, at penetrations for plumbing,
electrical, and gas lines, and in other openings.
For such construction cases, if appliances use inside air
for combustion, provide air openings into the building
from outside. Size and locate these openings per the
appropriate case in Figure 4, 5 or 6 on page 10.
• The boiler must have clearances of at least those shown in Figure 1,
page 7.
Opening must be directly to outside
• The opening must connect directly to the outdoors or to a space that
communicates directly to the outdoors (not to an interior space).
• The air can be provided through a direct opening or through a horizontal
or vertical duct.
Opening placement
• The top of the air opening must be within 12 inches of the ceiling.
Opening size
• The free area of the opening must be at least equal to the sum of the
areas of all equipment vent connectors in the space, and . . .
• The free area of the opening must be at least 1 square inch per 3,000
Btu/hr input rating of all equipment located in the space.
Exception for large spaces ✷
No combustion air openings are needed when the boiler (and other appliances) are installed in a space with a volume at least 50 cubic feet per
1,000 Btuh of all installed appliances, provided:
• the building must not have unusually tight construction (see definition, this page)
• all clearances around the boiler must must be no less than shown in
Figure 1, page 7.
To determine if the space is large enough to qualify:
• Add the total input of all appliances in MBH (1,000’s of Btuh).
• Multiply this number times 50 to determine minimum room volume.
• Example: For a total input of 100 MBH (100,000 Btuh), minimum
volume is 50 x 100 = 5,000 cubic feet. At a ceiling height of 8 feet, the
space must have at least 5,000 ÷ 8 = 625 square feet (25 feet x 25 feet,
for instance).
Part Number 550-110-290/0107
Exhaust fans and air movers
The appliance space must never be under a negative
pressure, even if the appliance(s) are installed as direct
vent. Always provide air openings sized not only to the
dimensions required for the firing rate of all appliances, but also to handle the air movement rate of the
exhaust fans or air movers using air from the building
or space.
Motorized air dampers
If the air openings are fitted with motorized dampers,
electrically interlock the damper to:
• Prevent the boiler from firing if the damper is not
fully open.
• Shut the boiler down should the damper close during boiler operation.
To accomplish this interlock, wire an isolated contact
(proving the damper open) in series with the thermostat input to the boiler. The boiler will not start if this
contact is open, and will shut down should it open
during operation.
11
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
2a
Prepare boiler — placement and setup
Place boiler/crate near
position
1. Leave boiler in crate and on pallet until installation
site is ready.
2. Move entire crate and pallet next to selected location.
3. Remove crate.
4. Remove boiler from pallet.
Do not drop boiler or bump jacket
on floor or pallet. Damage to boiler
can result.
a. Tilt left side of boiler up and place a board
under left legs.
b. Tilt boiler the other way and place a board
under right legs.
c. Slide boiler backward off pallet and into position.
5. Check level.
a. Shim legs, if necessary.
b. Do not alter legs.
Install inducer assembly
1. Remove the inducer assembly (and gasket) from its
shipping carton.
2. Place gasket on flue collector as shown in Figure 36,
page 59. Make sure the gasket is in good condition.
3. Secure in place with four nuts provided in a plastic
bag inside the inducer carton.
4. Wire inducer motor to control module by inserting Molex connector through rightmost jacket top
conduit opening (see page 3 for finished assembly).
Press strain relief bushing into hole. Insert Molex
connector into mating connector on control module. Connectors are keyed and can only be inserted
one way. See Figure 35, page 48, for location of
connector on control module.
12
Inspect orifices and burners
1.
2.
3. 4.
Correctly-sized manifold orifices
must be used. Failure to do so will
result in severe personal injury,
death or substantial property damage.
Remove front jacket door. Remove burner shield
(see Figure 37, item 4, page 62).
Verify that the orifice size is 2.7mm. (The orifice size
is stamped on the orifice spud barrel.)
Reinstall burner shield.
Do not operate boiler without
burner shield in place. Failure to do
so could result in severe personal
injury, death or substantial property
damage.
This product is used at sea level only.
Orifice replacement
procedure (when required)
1. Remove the screws securing the burner shield and
remove burner shield.
2. Using a 7/16” open-end wrench, remove the burner
orifices from the manifold.
3. Apply a small amount of pipe dope to each of the
new orifices and install in the manifold using a 7/16”
open-end wrench. Make sure the orifices are aligned
correctly, not cross-threaded in the manifold tappings.
Use only pipe dope compatible with
propane gas, even if boiler is to be
operated on natural gas. Failure to
comply could result in severe personal injury, death or substantial
property damage.
4. Carefully replace the burner shield.
5. Follow the check-out procedure of Section 8 to
ensure the boiler is now operating properly after
orifices are replaced.
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2b
Prepare boiler — pressure test
Hydrostatic pressure test
Pressure test boiler before attaching water or gas piping
(except as noted below) or electrical supply.
Prepare boiler for test
1. Remove the shipping nipple (from CGt supply tapping) and remove the boiler relief valve. Temporarily plug the relief valve tapping with a ¾” NPT pipe
plug.
2. Remove 1¼” nipple, reducing tee and drain valve
from circulator hardware bag. Install in boiler return connection as shown on page 3 and Figure 39,
page 62. Install circulator on the return side.
3. Remove 1¼” nipple, 1¼” x 1¼” x 1” tee from circulator hardware bag and pressure/temperature gauge
from inducer carton. Pipe to boiler supply connection as shown on page 3 and Figure 39, page 64.
(Use pipe dope sparingly.)
4. Connect a hose to boiler drain valve, the other end
connected to a fresh water supply. Make sure hose
can also be used to drain boiler after test.
5. Connect a nipple and shutoff valve to system supply
connection on the 1¼” tee. This valve will be used
to bleed air during the fill. (Valve and nipple are not
included with boiler.)
6. Connect a nipple and shutoff valve to system return connection (at circulator flange if circulator
installed on return). This valve will be used to bleed
air during the fill. (Valve and nipple are not included
with boiler.)
Fill and pressure test
1. Open the shutoff valves you installed on supply and
return connections.
2. Slowly open boiler drain valve and fresh water supply to fill boiler with water.
Part Number 550-110-290/0107
3. When water flows from shutoff valves, close boiler
drain valve.
4. Close shutoff valves.
5. Slowly reopen boiler drain valve until test pressure
on the pressure/temperature gauge reaches no more
than:
• 45 psig for boilers with 30 psig relief valve.
• 75 psig for boilers with 50 psig relief valve.
6. Test for no more than 10 minutes at:
• 45 psig for boilers with 30 psig relief valve.
• 75 psig for boilers with 50 psig relief valve.
Do not leave boiler unattended.
A cold water fill could expand and
cause excessive pressure, resulting
in severe personal injury, death or
substantial property damage.
7. Make sure constant gauge pressure has been maintained throughout test. Check for leaks. Repair if
found.
Leaks must be repaired at once.
Failure to do so can damage boiler,
resulting in substantial property
damage.
Do not use petroleum-based cleaning or sealing compounds in boiler
system. Severe damage to boiler
will occur, resulting in substantial
property damage.
Drain and remove fittings
1. Disconnect fill water hose from water source.
2. Drain boiler at drain valve or out hose, whichever
provides best access to drain. Remove hose after
draining if used to drain boiler.
3. Remove nipples and valves unless they will remain
for use in the system piping.
4. Remove plug from relief valve tapping. See page 20
to replace relief valve.
13
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
3a
Venting — general information
CGt venting options — Chimney draft or Direct exhaust
Chimney draft venting
Chimney draft venting uses the natural draft provided
by a vertical vent or chimney. Category I appliance (nonpositive vent static pressure and vent gas temperature
that avoids excessive condensate production in vent).
See Section 3b. Chimney draft installations use:
1. Vent connector (single or doublewall) sized to
eliminate positive pressure in vent system. Diameter
increases immediately at boiler.
2. Doublewall metal vent (B-vent) or chimney with
liner approved by the National Fuel Gas Code, ANSI
Z223.1–latest edition, or in Canada B149.1 or B149.2 Installation Code.
3b
1. Vent pipe specified in this manual.
2. Vent termination through outside wall, roof or unused chimney. Tight chimney areas will make vent
joint construction very difficult.
Venting — chimney draft venting
Table 2
Vent connector
diameter
Figure 7
Direct exhaust venting (vertical or sidewall)
Direct exhaust venting uses inside combustion air with
no combustion air connector piping. All CGt flue gas
vents are pressurized, requiring careful sealing of all
joints. Category III appliance (positive vent static pressure and vent gas temperature that avoids excessive
condensate production in vent). See pages 15-19. Direct
exhaust installations use:
Chimney draft venting
Inspect existing chimney before installing boiler. Failure
to clean or replace perforated pipe or lining will cause
severe personal injury or death.
Vent sizing given in Table 2 is only a general guideline.
The vent connector and chimney must be designed,
sized and constructed in compliance with all applicable
codes. Failure to correctly size and install the vent system
could result in severe personal injury, death or substantial property damage.
1. Use doublewall metal vent (B-vent) or chimney with liner as required by
the National Fuel Gas Code, ANSI Z223.1–latest edition, or in Canada,
B149.1 or B149.2 Installation Code.
2. To prevent downdrafts, chimney should extend at least 3 feet above the
highest point where it passes through a roof and at least 2 feet higher
than any portion of a building within a horizontal distance of 10 feet.
3. To vent with another appliance, see National Fuel Gas Code, ANSI
Z223.1–latest edition or in Canada B149.2 or B149.2 Installation
Code
4. Do not connect breeching to any portion of a mechanical draft system
that can operate under positive pressure.
5. Maintain minimum 2” clearance from combustible materials to vent
pipe.
6. Do not use chimney with an open fireplace.
7. Make horizontal runs as short as possible. Long runs can cause condensation.
8. When longer runs are used, support pipe with appropriate hangers.
9. To prevent blockage, do not vent into bottom of chimney.
10.Vent pipe must not go beyond inside wall of chimney.
11. Vent passing through floors or ceilings must be firestopped.
12. See Figure 7 and Table 2 to connect boiler to venting system.
14
Part Number 550-110-290/0107
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3c
Venting — direct exhaust — components
Obtain vent components
1. The following special gas vent systems comply with
UL-1738 and ULC-S636 standards and are certified
by CSA as the only systems suitable for use with CGt
boilers (all 3” diameter):
• Heat-Fab, Inc. Saf-T Vent®
• Flex-L International, Inc. StaR-34
• Z-Flex®, Inc. Z-Vent II
• ProTech Systems FasNSeal™
2. Select vent method based on page 14 and installation requirements.
3. Refer to Table 3 for maximum vent run lengths and
number of elbows. Do not exceed data in Table 3.
4. Select vent components from Table 4. All components, including the vent starter, must be of the same
vent manufacturer. Do not mix components.
Table 3 Maximum vent length
Use only the vent starter of the same
manufacturer as the vent components. Do not mix components
from different systems. The vent
system could fail, causing flue gas
spillage, resulting in severe personal
injury or death.
Table 4 Vent system components
Saf-T Vent®
Description
StaR-34
Z-Vent II
FasNSeal™
73WMCGIS
SRAWCG3
SVEWMFA03
FSA-WEIL-CGI
73WMTERM
--
SVSTPX03
FSB3S
Termination Elbow with Screen
1314TERM
SRTE-03
SVSTEX0390
FSTE90
Termination Tee with Screen
7390TEE
SRTT-03
SVSTTX03
FSTT3
Weil-McLain
part number
CGt Starter
Termination Coupling with Screen
699-999-001
Saf-T Vent®
part number
45° Elbow
7311GC
SRE4503
SVEEWC0345 FSEL4503
90° Elbow
7314GCTR
SRE9003
SVEEWC0390 FSEL9003
6" Pipe
7301GC
SR06P03
SVEPWC03.5
12" Pipe
7302GC
SR12P03
SVEPWC0301 FSVL1203
18" Pipe
7304GC
--
SVEPWC0318 FSVL1803
24" Pipe
7305GC
SR24P03
SVEPWC03
36" Pipe
--
SR36P03
SVEPWC0303 FSVL3603
37 ½" Pipe
7307GC
--
--
--
FSVL603
FSVL2403
Slip Connector (See NOTE)
7324GC9
SRSJ03
--
--
Horizontal Support
7323GC
--
--
FSSH
Horizontal Drain Tee
7320GC
SRTDH03
SVEDWC03
FSHDT3
--
SRJB-14
--
--
Joiner Band
Sealant
NOTE: Slip Connector
Part Number 550-110-290/0107
--
As specified by individual vent pipe manufacturer
Not required
Use slip connector to adjust for non-standard pipe lengths and Saf-T Vent® only, before
termination coupling to terminate run.
15
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
3d
Venting — direct exhaust — vent starter
1. Select a vent pipe manufacturer and
obtain all vent components needed,
based on boiler location and venting
method.
Figure 8 FasNSeal™ vent starter
Figure 9 Z-Vent II vent starter
Figure 10 Saf-T Vent® vent starter
Figure 11 StaR-34 vent starter
2. You must use the vent starter made
by the vent pipe manufacturer. See
Table 4, page 15, Vent system components, for part number of each component, listed by vent manufacturer.
Use only the vent
starter of the same
manufacturer as the
vent components. Do
not mix components
from different systems.
The vent system could
fail, causing flue gas
spillage, resulting in
severe personal injury
or death.
3. Follow all applicable national, state,
local or provincial codes when venting
the CGt boiler.
4. Connect vent starter to blower housing outlet as shown in the Figures 8
through 11, right.
a. Do not mix components from
different vent manufacturers.
b. Maintain minimum 2” clearance
from combustible materials to
vent pipe.
c. Seal with sealant specified by
vent pipe manufacturer, using ³⁄₈"
bead (not required for FasNSeal™).
d. Tighten strap at band clamp
screw until strap is snug around
blower housing.
16
Part Number 550-110-290/0107
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3e
Venting — direct exhaust — termination
Follow instructions on this page when determining vent
location to avoid possibility of severe personal injury,
death or substantial property damage.
1. Locate the boiler and vent penetration through the
wall so all requirements on this page and in Figure
12 will be met. Also follow vent manufacturer’s
instructions.
2. Gases will form white plume in winter. Plume could
obstruct window view.
3. Prevailing winds could cause freezing of condensate
and water/ice buildup on vent termination, building,
plants or roof. Ice buildup on vent termination can
cause boiler shutdown and building freezeup.
4. Winds over 40 mph can cause nuisance boiler shutdown if boiler is sidewall vented. This could result
in loss of heat to building, causing freezeup.
5. Locate or guard vent termination to prevent condensate from damaging exterior surfaces.
6. Locate the vent termination well away from trees,
shrubs, and decorative items.
7. Locate or guard vent to prevent accidental contact
by people or pets.
8. Do not terminate vent in window well, stairwell,
alcove, courtyard, or other recessed areas.
9. Do not wrap or insulate vent pipe or fittings.
10.Do not terminate vent above any door or window.
Condensate can freeze, causing ice formations.
11.Do not connect:
• Any other appliance to vent pipe.
• Multiple boilers to a common vent pipe.
12.Canadian installations — See B149.1 or B149.2 Installation Code. Terminate vent no less than 6
feet from another combustion air inlet, 3 feet from
any other building opening, and 3 feet from any gas
service regulator.
13.See Figure 12, showing that the vent must terminate:
• more than 4 feet below or to side of all doors
or windows.
• more than 1 foot above grade or anticipated
snow line.
• at least 7 feet above public walkway.
• 3 feet above any forced air intake within 10
feet.
14.Vent must also terminate:
• at least 6 feet away from adjacent walls.
• no closer than 5 feet below roof overhang.
• at least 4 feet horizontally (and in no case
above or below unless a 4 foot horizontal
distance is maintained) from electric meters,
gas meters, regulators, relief valves, and other
equipment.
15.Site conditions may dictate greater clearances.
16.Do not extend exposed vent pipe outside of building.
Condensate could freeze and block vent pipe.
A gas vent extending through an
exterior wall shall not terminate adjacent to the wall or below building
extensions such as eaves, parapets,
balconies or decks. Failure to comply could result in severe personal
injury, death or substantial property
damage.
Figure 12 Vent termination minimum clearances
Part Number 550-110-290/0107
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GOLD CGt Gas-Fired Water Boiler — Boiler Manual
3f
Venting – direct exhaust – vertical or sidewall
1. Do not mix types or manufacturers of vent materials.
2. Clean all joints before sealing. See vent manufacturer’s instructions
for cleaning and sealing joints. Use their specified sealant. Do not use
screws.
3. Install vent pipe with seams on top of vent horizontal runs. Follow
requirements in Section 3e, page 17, for vent termination.
4. Maintain minimum 2” clearance from combustible materials to vent
pipe.
5. Vertical venting — See Figure 13. Follow vent manufacturer’s instructions for venting through roof.
• Vent pipe must extend through roof flashing, jacket or thimble.
• Vent may pass through floor, inside wall or concealed space when
installed according to vent manufacturer’s instructions.
Sidewall venting — See Figures 14 and 15. Vent must terminate
at least one foot above anticipated snowline. Vent must be terminated only with:
• Tee or elbow with integral screen. Tee must be mounted vertically.
• Elbow and termination coupling with screen (not available for
StaR-34).
6. Do not seal vent pipe (slip connector for Saf-T Vent) to inside or outside
plate.
7. If passing through noncombustible wall, provide hole diameter large
enough to insert the vent pipe (slip connector for Saf-T Vent).
8. Install horizontal drain tee as close as possible to boiler, in first horizontal
run. See Figure 13.
9. Do not exceed the maximum vent system length given in Table 4,
page 15.
18
Figure 13 Direct exhaust vertical venting
Figure 14 Direct exhaust sidewall venting
Condensate drain line — use only silicone tubing
rated for at least 400°F for the condensate drain line.
Using any other material could cause flue gas leakage,
potentially resulting in severe personal injury, death
or substantial property damage.
On some installations, the condensate drain fitting
may be omitted, provided:
• Vent manufacturer shows this option in their
instructions.
• Vent is sloped toward termination as shown in
dotted lines in Figure 14.
• The vent is installed per Weil-McLain and vent
manufacturer’s instructions.
Condensate drippage from such vents may accumulate on the ground below. Consider traffic in the area
to avoid hazard due to ice accumulation. Ice buildup
may also block vent.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
Using any termination other than one of those shown could cause nuisance outages and loss of heat, resulting
in substantial property damage.
Figure 15 Sidewall termination
Part Number 550-110-290/0107
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GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4a
Water piping — general information
General piping information
If installation is to comply with ASME or Canadian
requirements, an additional high temperature limit is
needed. Install control in supply piping between boiler
and isolation valve. Set second control to minimum
20°F above setpoint of first control. Maximum allowable
setpoint is 240°F. See Section 9b for wiring.
A low water cutoff device is required when boiler is
installed above radiation level or by certain state or local codes or insurance companies. Use low water cutoff
designed for water installations. Electrode probe-type
is recommended. Purchase and install in tee in supply
piping above boiler.
Use backflow check valve in cold water supply as required by local codes.
If boiler is installed in a closet, it is recommended to
insulate the boiler piping in the closet to lower the closet
air temperature.
Pressure/temperature gauge
Install pressure/temperature gauge in the tee on the
supply piping (as shown in drawing on page 3).
•
•
•
To avoid water damage or scalding due to relief valve operation:
Discharge line must be connected to relief valve
outlet and run to a safe place of disposal. Terminate the discharge line to eliminate possibility
of severe burns should the valve discharge.
Discharge line must be as short as possible and
be the same size as the valve discharge connection throughout its entire length.
Discharge line must pitch downward from the
valve and terminate at least 6” above the floor
drain where any discharge will be clearly visible.
The discharge line shall terminate plain, not
threaded, with a material serviceable for temperatures of 375°F or greater.
Relief valve
•
Install relief valve vertically in ¾” tapping on side of
boiler. See Figure 16, page 21, and the tag attached to
the relief valve for manufacturer’s instructions.
• Do not pipe the discharge to any place where
Circulator and 3-way valve
1. See page 64, Figure 39.
2. Apply pipe dope to fittings and install in boiler
supply and return tappings in the order shown in
Figure 39.
3. Install circulator, flanges and gaskets.
4. Complete by soldering copper fittings and 3-way
valve in the order shown in Figure 39.
5. Pull 3-way valve Molex and harness through jacket
top left conduit opening.
6. Insert Molex connector into mating connector on
3-way valve. Make sure that valve body is in correct
position as shown in Figure 39.
20
The circulator is shipped loose (wiring pre-attached
to boiler). Pipe the circulator on the return line only,
as shown on page 3 and page 64. Pipe the expansion
tank to the suction side of the circulator as shown in
Figure 16, page 21. Install an air separator in the supply piping. Always install the system fill connection at
the same point as the expansion tank connection to
the system. Figure 16 shows typical near-boiler piping
connections.
freezing could occur.
• No shutoff valve shall be installed between the
relief valve and boiler, or in the discharge line.
Do not plug or place any obstruction in the
discharge line.
• Failure to comply with the above guidelines
could result in failure of the relief valve to operate, resulting in possibility of severe personal
injury, death or substantial property damage.
• Test the operation of the valve after filling and
pressurizing system by lifting the lever. Make
sure the valve discharges freely. If the valve fails
to operate correctly, replace it with a new relief
valve.
Part Number 550-110-290/0107
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4b
Water piping — system
System water piping
See Figure 16 and Table 5 for near-boiler piping and piping for single-zone systems designed for return water
at least 130°F.
See pages 22-23 to for multiple-zone piping for systems
with return water tempeature of at least 130°F. See pages
24-25 for low-temperature system piping; i.e., radiant
heating systems or converted gravity systems (largevolume systems originally designed for circulation by
natural convection rather than a pump).
Table 5 Water pipe size (based on 20°F rise)
Boiler
model number
To
system
From
system
CGt
1"
1"
Note: The following connections (supplied with the boiler)
are 1¼” NPT – Boiler supply and return tappings;
drain tee; suppy tee; circulator suction-side flange.
The following connections (supplied with the boiler)
are 1” NPT – Circulator discharge-side flange; 3-way
valve and its connected pipe fittings.
Use Figure 16 only for singlezone systems designed for return water at least 130°F. For
systems with low return water
temperature possible, such as
converted gravity systems and
radiant heating systems, refer to
the special piping suggestions of
pages 24-25. Failure to prevent
low return water temperature
to the boiler could cause corrosion of the boiler sections or
burners, resulting in severe personal injury, death or substantial
property damage.
Chillers or air handling units:
Install boiler such that —
• Chilled medium, if used, is piped in parallel with
heating boiler. Use appropriate valves to prevent
chilled medium from entering boiler. Consult
I=B=R Installation and Piping Guides.
• If boiler is connected to heating coils located in
air handling units where they can be exposed to
refrigerated air, use flow control valves or other automatic means to prevent gravity circulation during
cooling cycle. Circulation of cold water through the
boiler could result in damage to the heat exchanger,
causing possible severe personal injury, death or
substantial property damage.
Figure 16
Piping to single-zone system using diaphragm-type or bladder-type expansion
tank. See Table 5 for piping sizes.
Expansion tank
The piping of the CGt boiler requires the use of a bladder-type or
diaphragm-type expansion tank.
Use of a closed-type tank is not
recommended.
Undersized expansion tanks cause
system water to be lost from relief
valve and makeup water to be added
through fill valve. Eventual section
failure can result.
1. Ensure expansion tank size will handle boiler and
system water volume and temperature. Tank must
be located in boiler return piping as close to boiler
as possible, before inlet side of circulator. See tank
manufacturer’s instructions for details.
2. Install an automatic air vent as shown.
Part Number 550-110-290/0107
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GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4c
Water piping — multiple zones
Piping multiple zones
Follow instructions on pages 20 and 21 to install nearboiler piping or for single-zone systems. (Also see ”Piping for radiant heating systems or converted gravity
systems” if applicable.)
See Figure 18 or Figure 19, page 23, to complete installation.
Zoning with circulators (Figure 18)
(return temp over 130°F)
1. Size each circulator to individual circuit requirements.
2. Do not install circulator on boiler (except for primary/secondary bypass piping).
3. Install isolation (balancing) valves to adjust flow to
distribute heat to all zones.
4. Install and wire a separate relay for each zone circulator.
Zoning with zone valves (Figure 19)
(return temp over 130°F )
1. Install isolation (balancing) valves to adjust flow to
distribute heat to all zones.
2. Provide a separate 24-volt transformer to power the
zone valves. Size the transformer to handle the total
rated load of all connected zone valves.
Piping for radiant heating
systems or converted gravity
systems
Failure to prevent low return water
temperature to the boiler could
cause corrosion of the boiler sections or burners, resulting in severe
personal injury, death or substantial
property damage.
Converted gravity (or steam) systems
Whenever possible, use the primary/secondary bypass
piping shown in Figures 20 or 21 on page 25. This piping
design allows changing boiler flow rate without affecting
primary circuit flow rate.
Radiant heating systems
Preferably, use primary/secondary bypass piping, as
shown in Figures 20 or 21 on page 25.
If radiant system tubing has no oxygen barrier, a heat
exchanger must be used.
Radiant heating system piping should include a means of regulating the boiler return water
temperature and the system supply temperature (such as provided by an injection pumping
control). Boiler return water temperature will be adequately controlled using the methods
shown in this manual provided the system supply temperature is relatively constant.
DO NOT apply the methods in this manual if the system is equipped with an outdoor reset
control. Instead, provide controls and piping which can regulate the boiler return water
temperature at no less than 130°F regardless of system supply temperature. Contact your
Weil-McLain representative for suggested piping and control methods. Failure to prevent
cold return water temperature to the boiler could cause corrosion damage to the sections
or burners, resulting in possible severe personal injury, death or substantial property damage.
22
Part Number 550-110-290/0107
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4c
Water piping — multiple zones
Figure 18
1 Boiler isolation (balancing) valves
2 Flow/check valve
3 System or zone circulator
Zoning with zone valves
— return water 130°F or higher.
10 Automatic air vent (with diaphragm-type expansion tank), or con-
nect to tank fitting (closed-type expansion tank). DO NOT use an
automatic air vent when using closed-type expansion tank. It would
allow air to leave the system, causing waterlogging of the expansion
tank.
11 Fill valve
5 Zone valve
12 Diaphragm-type or bladder-type expansion tank
6 Drain valve
13 Air separator with automatic vent, if used (Note that the fill valve
9 Relief valve
must always be connected to the expansion tank.)
Part Number 550-110-290/0107
Figure 19
Zoning with circulators
— return water 130°F or higher.
(continued)
For systems with possible low return-water temperature (such as converted gravity systems,
radiant heating systems and heat pump systems), refer to the special piping suggestions of
Figures 20 – 21, page 25, as applies. Failure to prevent sustained low return water temperature to the boiler could cause corrosion of the boiler sections, resulting in severe personal
injury, death or substantial property damage.
23
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4d
Piping — low temperature systems
Bypass piping
Figures 20 and 21, page 25, show suggested bypass ar-
rangements using bypass piping for low temperature
systems such as radiant heating systems or converted
gravity systems.
Primary/secondary bypass piping is required because
the boiler circulator must install on the return line and
be used to provide domestic water priority. Adjustment
of the bypass valves in the boiler circuit will not cause a
change in the heating circuit flow rate or temperature
distribution.
The bypass valves in Figures 20 and 21 (items 7a
and 7b) provide mixing of hot boiler outlet water with
cooler system return water — set to assure a minimum
return water temperature (at least 130°F) to the boiler.
Set the valves as explained below.
Temperature gauges
• Gauge 4a is suggested, but optional on any system.
• Gauge 4b is optional on converted gravity systems,
but required on radiant heating systems — to display the water temperature being supplied to the
radiant tubing.
24
• Gauge 8 is required on all systems to assure the
return water temperature is accurately set for a minimum of 130°F. If this gauge is not available however,
adjust the valves such that the boiler-mounted temperature/pressure gauge reads at least 150°F when
the system return water is cold (approximately 60°F
water temperature).
Valve adjustment
(Figures 20 and 21 only)
1. Set the valves while the system is cool, setting for the
coldest expected water temperature (usually 60°F
since the system will often drop to room temperature between cycles).
2. Start with valve 7a fully closed and 7b fully open.
3. Gradually open valve 7a while closing valve 7b until
the temperature at gauge 8 reads 130°F when gauge
4a reads 60°F.
4. Note that valve 7a regulates the amount of hot water
from the boiler supply which mixes with return water. Valve 7b regulates the amount of system water
flowing through the boiler secondary loop.
Failure to prevent low return water temperature to the boiler could cause corrosion of
the boiler sections or burners, resulting in severe personal injury, death or substantial
property damage.
Radiant heating system piping should include a means of regulating the boiler return
water temperature and the system supply temperature (such as provided by an injection pumping control).
Boiler return water temperature will be adequately controlled using the methods shown
in this manual provided the system supply temperature is relatively constant.
DO NOT apply the methods of this manual if the system is equipped with an outdoor
reset control. Instead, provide controls and piping which can regulate the boiler return water temperature at no less than 130°F regardless of system supply temperature.
Contact your Weil-McLain representative for suggested piping and control methods.
Failure to prevent cold return water temperature to the boiler could cause corrosion
damage to the sections or burners, resulting in possible severe personal injury, death or
substantial property damage.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4d
Piping — low temperature systems
Figure 20
By-pass piping
Zoning with circulators
Figure 21
By-pass piping
Zoning with zone valves
1 Boiler isolation (balancing) valves
8 Blend temperature gauge
2 Flow/check valve
9 Relief valve
3 System or zone circulator
(continued)
10 Automatic air vent
4 System temperature gauges
5 Zone valve
6 Drain valve
7 System temperature valves (see instruc-
tions on page 24 for adjusting valves)
Part Number 550-110-290/0107
11 Fill valve
12 Diaphragm-type or bladder-type expansion tank, if used
13 Air separator and automatic vent, if used (Note that the fill valve
must always be connected to the expansion tank, at item 11.)
25
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4e
Water piping — connect tankless heater
Hot Water Can Scald!
• Consumer Product Safety Commission and some states recommend
domestic hot water temperature of 130°F or less.
• When installing an automatic mixing valve, selection and installation must
comply with valve manufacturer’s recommendations and instructions.
• Water heated to a temperature suitable for clothes washing, dish washing
and other sanitizing needs will scaled and cause injury
• Children, elderly, infirm or physically handicapped persons are more
likely to be injured by hot water. Never leave them unattended in or near
a bathtub, shower or sink. Never allow small children to use a hot water
faucet or draw their own bath. If anyone using hot water in the building
fits this description, or if state laws or local codes require certain water
temperatures at hot water faucets, take special precautions:
• Install automatic mixing valve set according to those standards.
• Use lowest practical temperature setting.
• Check water temperature immediately after first heating cycle and after
any adjustment.
Protection Must Be Taken Against Excessive Temperature and Pressure! — Installation of a Temperature & Pressure (T&P) relief valve is required.
To pipe tankless heater:
1. Size piping no smaller than tankless heater inlet and outlet.
2. The following controls (furnished by others) must be installed:
a. Automatic mixing valve see Figure 22. See DANGER above.
b. Flow regulating valve. Size according to intermittent draw of tankless heater. See Table 6. Follow valve manufacturer’s instructions
to install.
3. Additional anti-scald devices may be installed at each hot water faucet,
bath and shower outlet.
4. In hard water areas, soften cold domestic supply water to heaters to
prevent lime build-up.
To set tankless heater low limit:
Table 6
Tankless heater rating table
Figure 22 Tankless heater piping
1. Adjust setpoint dial to 190°F - 200°F. The boiler high limit should be
set 20°F higher.
Studies have indicated that dangerous bacteria can form
in potable water distribution system if certain minimum
water temperatures are not maintained. Contact local
health department for more information.
These single wall heat exchangers comply with National
Standard Plumbing Code provided that:
• Boiler water (including additives) is practically nontoxic, having a toxicity rating or class of 1, as listed
in Clinical Toxicology of Commercial Products.
• Boiler water pressure is limited to maximum 30 psig
by approved water relief valve.
If boiler is installed in a closet, it is recommended to
insulate the supply piping of domestic hot water to
lower closet air temperature.
26
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4f
Water piping — refrigeration systems
Prevent chilled water from entering boiler
Install boiler so that chilled medium is piped in parallel with the heating boiler. Use appropriate
valves to prevent chilled medium from entering boiler. See Figure 23 for typical installation
of balancing valve and check valve.
If boiler is connected to heating coils located in air handling units where they can be exposed
to refrigerated air, use flow control valves or other automatic means to prevent gravity circulation during cooling cycle.
Figure 23 Piping refrigeration systems
Part Number 550-110-290/0107
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GOLD CGt Gas-Fired Water Boiler — Boiler Manual
5
Gas piping
Connecting gas supply piping to boiler
1. Remove jacket front panel and refer to Figure 24 to pipe gas to boiler.
a. Install drip leg at inlet of gas connection to boiler. Where local
utility requires drip leg to be extended to the floor, use appropriate length of pipe between cap and tee.
b. Install ground joint union for servicing, when required.
c. Install manual shutoff valve in gas supply piping outside boiler
jacket when required by local codes or utility requirements.
d. In Canada — When using manual main shutoff valve, it must be
identified by the installer.
2. Support piping with hangers, not by boiler or its accessories.
3. Purge all air from gas supply piping.
4. Before placing boiler in operation, check boiler and its gas connection
for leaks.
a. Close manual main shutoff valve during any pressure testing at
less than 13” w.c.
b. Disconnect boiler and gas valve from gas supply piping during
any pressure testing greater than 13” w.c.
Do not check for gas leaks with an open flame — use
bubble test. Failure to use bubble test or check for gas
leaks can cause severe personal injury, death or substantial property damage.
Table 7 Pipe capacity for 0.60 specific gravity natural gas
28
5. Use pipe dope compatible with propane gases.
Apply sparingly only to male threads of pipe joints
so that pipe dope does not block gas flow.
Failure to apply pipe dope as detailed
above can result in severe personal
injury, death or substantial property
damage.
Sizing gas supply piping
1. Refer to Table 7 for pipe length and diameter. Base
on rated boiler input (divide by 1,000 to obtain cubic
feet per hour). Table 7 is only for gas with specific
gravity 0.60, with a pressure drop through the
gas piping of 0.30” w.c. For additional gas pipe
sizing information, refer to ANSI Z223.1 (or B149.1
or B149.2 for Canadian installations).
2. Inlet pressure required at gas valve inlet:
• Maximum: 13” w.c.
• Minimum: 5” w.c.
• Manifold gas pressure: 3.5” w.c.
3. Install 100% lockup gas pressure regulator in supply
line if inlet pressure exceeds 13” w.c. Adjust for
13” w.c. maximum.
Figure 24 Gas supply piping
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
6
Field wiring
For your safety, turn off electrical power supply at
service entrance panel before making any electrical connections to avoid possible electric shock hazard. Failure
to do so can cause severe personal injury or death.
Thermostat
Wiring must be N.E.C. Class 1.
2. Install on inside wall away from influences of drafts,
If original rollout thermal fuse element wire as supplied
with boiler must be replaced, use only type 200°C wire
or equivalent. If other original wiring as supplied with
boiler must be replaced, type 105°C wire or equivalent
must be used.
Boiler must be electrically grounded as required by National Electrical Code ANSI/NFPA 70–latest edition.
Electrical installation must
comply with:
1. National Electrical Code and any other national,
state, provincial or local codes or regulations.
2. In Canada, CSA C22.1 Canadian Electrical Code
Part 1, and any local codes.
Wiring connections
Boiler is shipped with controls completely wired. You
must connect the ambient temperature switch wires
(page 3, item 10) to the switch after the boiler is in place.
See page 6 for switch location and mounting. The factory-supplied wires are 4-feet long. Splice additional
wire if needed.
1. Connect thermostat as shown on wiring diagram
on boiler.
hot or cold water pipes, lighting fixtures, television,
sunrays, or fireplaces.
3. If thermostat has a heat anticipator, set heat anticipator in thermostat to match power requirements
of equipment connected to it. If connected directly
to boiler, set for 0.1 amps plus gas valve current.
See information on wiring diagram as shown
in Figure 29, page 35. For other devices, refer to
manufacturer’s specifications. Wiring diagram on
boiler gives setting for control module and gas valve.
Also see instructions with thermostat.
Junction Box (furnished)
1. Connect 120 VAC power wiring as shown in Figure 25.
2. Fused disconnect or service switch (15 amp. recommended) may be mounted on this box. For those
installations with local codes which prohibit installation of fused disconnect or service switch on boiler,
install a 2 x 4 cover plate on the boiler junction box
and mount the service switch remotely as required
by the code.
The CGt control module is polarity-sensitive. The hot and neutral wires must be connected to
the correct leads. A flashing POWER light usually indicates reversed polarity of 120 VAC lead
wires.
Figure 25
Field wiring connections —
service switch and thermostat
(or end switch)
provided by installer
Part Number 550-110-290/0107
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GOLD CGt Gas-Fired Water Boiler — Boiler Manual
7a
Start-up — preparation
Check for gas leaks
Before starting the boiler, and during initial operation,
smell near the floor and around the boiler for gas odorant or any unusual odor. Do not proceed with start-up
if there is any indication of a gas leak. Repair any leak
at once.
Determine if water treatment is needed
Do not use petroleum-based cleaning or sealing compounds in boiler system. Severe damage to boiler will
occur, resulting in substantial property damage.
Eliminate all system leaks. Continual fresh makeup
water will reduce boiler life. Minerals can build up in
sections, reducing heat transfer, overheating cast iron,
and causing section failure.
Verify water chemistry
Consult local water treatment companies for unusually hard water areas
(above 7 grains hardness) or low pH water conditions (below 7.0). Boiler
water pH of 7.0 to 8.5 is recommended.
Freeze protection
(when used)
Use antifreeze made especially for hydronic systems. Inhibited propylene
glycol is recommended. Do not use ethylene glycol, automotive or undiluted
antifreeze. Severe personal injury or death can result.
1. Determine antifreeze quantity according to system water content. Boiler
water content is listed on page 67. Remember to include expansion tank
water content.
2. Follow antifreeze manufacturer’s instructions.
3. A 50% solution of propylene glycol/water provides maximum protection to about -30°F.
4. Local codes may require back flow preventer or actual disconnect from
city water supply.
5. When using antifreeze in a system with automatic fill, install a water
meter to monitor water makeup. Glycol will leak before the water begins to leak, causing glycol level to drop. Added water will dilute the
antifreeze, reducing the freeze protection level.
30
Fill the system with water
1. Close manual and automatic air vents and boiler
drain cock.
2. Fill to correct system pressure. Correct pressure
will vary with each application. Typical cold water
fill pressure for a residential system is 12 psi.
3. Purge air from system:
a. Connect a hose to the purge valve (see drain
valves, item 6, in suggested piping diagrams
on pages 23 through 25, Figures 18 through
Figure 21). Route hose to an area where water
can drain and be seen.
b. Close the boiler or system isolation valve
between the purge valve and fill connection to
the system.
c. Close zone isolation valves.
d. Open quick-fill valve on cold water makeup
line.
e. Open purge valve.
f. One zone at a time, open the isolation valves.
Allow water to run through the zone, pushing
out the air. Run until no noticeable air flow
is present. Close the zone isolation valves and
proceed with the next zone. Follow this procedure until all zones are purged.
g. Close the quick-fill water valve and purge
valve and remove the hose. Open all isolation
valves. Watch that system pressure rises to correct cold-fill pressure.
h. After the system has operated for a while,
eliminate any residual air by using the manual
air vents located throughout the system.
i. If purge valves are not installed in system,
open manual air vents in system one at a time,
beginning with lowest floor. Close vent when
water squirts out. Repeat with remaining
vents.
4. Open automatic air vent (diaphragm-type or bladder-type expansion tank systems only) one turn.
5. Open other vents:
a. Starting on the lowest floor, open air vents one
at a time until water squirts out.
b. Repeat with remaining vents.
6. Refill to correct pressure.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
7a
Start-up — preparation
Inspect system water piping
After filling the boiler and system with water, inspect all piping
throughout the system for leaks. If found, repair immediately.
Repeat this inspection after the boiler has been started and the
system has heated up.
Leaks must be repaired at once. Failure to
do so can damage the boiler, resulting in
substantial property damage.
Do not use petroleum-based cleaning or
sealing compounds in boiler system. Severe
damage to boiler will occur, resulting in substantial property damage.
7b
(continued)
Inspect base insulation
The boiler contains ceramic fiber and fiberglass materials. Use care when handling these
materials per instructions on page 68 of this
manual. Failure to comply could result in
severe personal injury.
Check to make sure insulation is secure against all four sides of
the base. If insulation is damaged or displaced, do not operate
boiler. Replace or reposition insulation.
Failure to replace damaged insulation or
reposition insulation can result in a fire hazard, causing severe personal injury, death or
substantial property damage.
Start-up — operate boiler
Final check before starting boiler
• Read manual Section 9, including the Operating instructions
(Section 9c).
• Verify the boiler and system are full of water.
• Verify the Start-up preparation procedures of Section 7a have
been completed.
Start the boiler
• Follow the Operating instructions from Section 9c to start
the boiler.
• See Section 7c if boiler fails to start.
Check system and boiler
1. Check system piping and domestic hot water piping for leaks.
If found, shut down boiler and repair immediately.
2. Vent air from system using manual vents. Air in the system
will interfere with circulation and cause heat distribution
problems and noise.
3. Inspect vent system thoroughly for signs of deterioration
from corrosion, physical damage or sagging. In addition
— Check for gas-tight seal at every connection and seam.
4. Check around the boiler for gas odor following the procedure
of Section 7a of this manual.
5. Verify operation per Section 7b. Perform check-out procedure in Section 8, and fill in the Installation and service
certificate on the same page.
Part Number 550-110-290/0107
Do not use petroleum-based cleaning or
sealing compounds in boiler system. Severe damage to boiler will occur, resulting
in substantial property damage.
Eliminate all system leaks. Continual fresh
makeup water will reduce boiler life. Minerals can build up in sections, reducing
heat transfer, overheating cast iron, and
causing section failure.
Glycol or antifreeze leaks around the boiler
may result in fire, causing severe personal
injury, death or substantial property damage.
Venting system must be sealed gas-tight
If you discover evidence of any gas leak,
shut down the boiler at once. Find the
leak source with bubble test and repair
immediately. Do not start boiler again
until corrected. Failure to comply could
result in severe personal injury, death or
substantial property damage.
to prevent flue gas spillage and carbon
monoxide emissions which will result in
severe personal injury or death.
31
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
7b
Start-up — operate boiler
(continued)
Check burner flames
View pilot and main flames through the inspection port
in the base burner shield.
Figure 26 Typical pilot burner flame
Pilot burner flame (Figure 26)
PROPER pilot flame characteristics:
1. Blue flame.
2. Inner cone engulfing pilot flame sensor.
3. Pilot flame sensor glowing cherry red.
IMPROPER pilot flame characteristics:
1. Overfired — Large flame lifting or blowing past pilot
flame sensor.
2. Underfired — Small flame. Inner cone not engulfing
pilot flame sensor.
3. Lack of primary air — Yellow flame tip.
4. Incorrectly heated pilot flame sensor.
Main burner flame (Figure 27)
PROPER main burner flame characteristics:
Figure 27 Typical main burner flame
1. Yellow-orange streaks may appear (caused by
dust).
IMPROPER main burner flame characteristics:
1. Overfired — Large flames.
2. Underfired — Small flames.
3. Lack of primary air — Yellow tipping on flames
(sooting will occur).
7c
Start-up — if boiler doesn’t start . . .
Check for:
1.
2.
3.
4.
5.
32
Loose connections, blown fuse or service switch off?
High limit switch set below boiler water temperature?
Thermostat set below room temperature?
Gas not turned on at meter or boiler?
Incoming gas pressure less than 5” w.c. for natural
gas?
6. If none of the preceding corrects the problem,
refer to Troubleshooting, Section 11 of this
manual.
If the boiler water temperature is
below tankless heater low limit
setting, boiler can be started
even if thermostat is set above
room temperature.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
8
❏
❏
❏
❏
❏
❏
❏
❏
❏
❏
❏
Check-out procedure — checklist
Boiler and heat distribution units filled with water?
Automatic air vent, if used, open one full turn?
Air purged from system?
Air purged from gas piping? Piping checked for leaks?
Correctly sized manifold orifices installed? Refer to page 12 to check size.
Correctly sized manifold orifices must be used.
Failure to do so will cause severe personal injury, death or substantial property damage.
Followed operating instructions on boiler or in manual Section 9 for proper start-up?
Proper burner flame observed? Refer to Check burner flames,
manual Section 7b.
Test limit control — While burners are operating, move indicator on limit control below actual boiler water temperature.
Burners should go off while circulator continues to operate.
Raise setting on limit control above boiler water temperature
and burners should reignite.
Test tankless heat low limit control — While burners are
operating, move indicator on low limit control above actual
boiler water temperature. The 3-way valve should operate to
bypass all flow around the boiler. If low limit and valve operate
correctly, turn setting on low limit back to normal. The 3-way
valve should return to normal position.
Test additional field-installed controls — If boiler has a low
water cutoff, additional high limit or other controls, test for
operation as outlined by manufacturer. Burners should be
operating and should go off when controls are tested. When
controls are restored, burners should reignite. Test ambient
temperature switch by disconnecting one of the wires from
the switch. Boiler shut down until wire is replaced.
Test ignition system safety device:
a. Connect manometer to outlet side of gas valve.
b. Start boiler, allowing for normal start-up cycle to occur
and main burners to ignite.
c. With main burners on, manually shut off gas supply at
manual main shutoff gas valve. Burners should go off.
d. Open manual main shutoff gas valve. Manometer
should confirm there is no gas flow.
e. Pilot will relight, flame sensing element will sense pilot
flame and main burners will reignite.
❏ Set limit control(s) to system temperature requirements.
Adjust balancing valves and controls to provide design temperature to system.
❏ For multiple zones, adjust flow so it is about the same in each
zone.
❏ Verify thermostat heat anticipator (if available) set properly?
Refer to Field wiring, manual Section 6, page 29, Thermostat.
❏ Cycle boiler with thermostat — Raise to highest setting and
verify boiler goes through normal start-up cycle. Lower to
lowest setting and verify boiler goes off.
❏ Measure natural gas input:
a. Operate boiler 10 minutes.
b. Turn off other appliances.
c. At natural gas meter, measure time (in seconds) required to use one cubic foot of gas.
d. Calculate gas input:
e. Btuh calculated should approximate input rating on
boiler rating label.
❏ Check manifold gas pressure by connecting manometer to
downstream test tapping on main gas valve. Manifold pressure
for natural gas should be 3.5" w.c.
❏ Observe several operating cycles for proper operation.
❏ Set room thermostat to desired room temperature.
❏ Fill in Installation and service certificate below?
❏ Review all instructions shipped with this boiler with owner
or maintenance person. Return instructions to envelope and
give to owner or place in pocket inside front panel in boiler.
Installation and service certificate
Boiler model __________________ Series __________ CP number ___________ Date installed ___________
Measured Btuh input ____________________
❏
❏
❏
❏
Installation instructions have been followed.
Check out sequence has been performed.
Above information is certified to be correct.
Information received and left with owner/maintenance person
Installer ________________________ ________________________________ ________________________
(company) (address) (phone)
Installer’s signature: _____________________________________
Part Number 550-110-290/0107
33
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
9a
Operation — sequence
1. Read Operating instructions in Section 9c. This
information is also located on a label on the inside
of the boiler jacket door panel. Notice that either
the room thermostat or the tankless heater low limit
control can cause a call for heat.
2. Raise room thermostat (or raise setting of tankless
heater low limit control) to call for heat.
3. Circulator energizes. If limit circuit is closed, the
inducer starts. After pressure switch proves proper
airflow, control module initiates 10-second prepurge.
4. Control module sparks the pilot and opens pilot
valve in main gas valve.
a. If pilot does not light within 15 seconds, pilot
valve is closed and spark generator is turned
off. Control module initiates a 15-second
postpurge, then starts a new cycle.
b. If pilot does light and control module senses
flame current, spark generator is turned off
and main valve opens.
5. During main burner operation:
a. Control module monitors pilot flame current. If signal is lost,
main valve closes, spark generator activates and sequence returns
to step 4.
b. If power is interrupted, control system shuts off pilot and main
gas valves and restarts at step 1 when power is restored.
6. In the event the limit control shuts down the boiler — The control
module closes the pilot and main gas valves, but keeps the inducer
operating for 15-second postpurge.
— The circulator continues to operate.
7. Lower room thermostat setting (or lower tankless heater low limit
control setting) to stop call for heat. Pilot and main gas valves close
— Inducer operates for 15-second postpurge — Circulator shuts off.
8. Boiler is now in the off cycle.
9. Repeat steps 1 through 6 several times to verify operation.
10. Return the thermostat or tankless heater low limit to normal setting.
11.Set thermostat heat anticipator setting as instructed in Figure 29,
page 35.
Figure 28 Control module sequence of operation — status light indications
34
Part Number 550-110-290/0107
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9b
Operation — wiring diagram
Figure 29 Schematic and ladder wiring diagram
Part Number 550-110-290/0107
35
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
9c
36
Operating instructions
• Spark pilot
• Natural or propane gas
• Gas valve: Honeywell VR8204/VR8304
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
9c
Operating instructions
Part Number 550-110-290/0107
• Spark pilot
• Natural or propane gas
• Gas valve: White-Rodgers 36E
37
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
9c
38
Operating instructions
• Spark pilot
• Natural or propane gas
• Gas valve: White-Rodgers 36C
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
10a
Service and maintenance — schedule
VERIFY PROPER OPERATION AFTER SERVICING
Table 8 Service and maintenance schedules
Part Number 550-110-290/0107
Follow the Service and maintenance procedures given throughout this manual and in component literature shipped with the boiler. Failure to perform the service and maintenance
could result in damage to the boiler or system. Failure to follow the directions in this manual
and component literature could result in severe personal injury, death or substantial property
damage.
39
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
10b
Service and maintenance — annual start-up
Air openings
The boiler should be inspected and started annually, at the beginning of the heating season, only
by a qualified service technician. In addition, the
maintenance and care of the boiler designated in
Table 8, page 39, and explained on the following
pages must be performed to assure maximum boiler
efficiency and reliability. Failure to service and maintain the boiler and system could result in equipment
failure.
Eliminate all system or boiler leaks. Continual
fresh makeup water will reduce boiler life. Minerals can build up in sections, reducing heat transfer,
overheating cast iron, and causing section failure.
Leaking water may also cause severe property damage.
Do not use petroleum-based cleaning or sealing
compounds in boiler system. Severe damage to
boiler will occur, resulting in substantial property
damage.
Electrical shock hazard — Turn off power to the
boiler before any service operation on the boiler
except as noted otherwise in this instruction manual.
Failure to turn off electrical power could result in
electrical shock, causing severe personal injury or
death.
1. Verify that combustion and ventilation air openings
to the boiler room and/or building are open and
unobstructed.
2. Verify that boiler vent discharge is clean and free
of obstructions.
Flue gas vent system
1. Visually inspect entire flue gas venting system
for blockage, deterioration or leakage. Repair any
joints that show signs of leakage in accordance with
vent manufacturer’s instructions.
Failure to inspect for the above
conditions and have them repaired
can result in severe personal injury
or death.
Pilot and main burner flames
1. Visually inspect pilot burner and main burner
flames as directed under Start-up, Section 7b of
this manual.
Water piping
1. Check the boiler interior piping and all system piping for signs of leaks.
2. Repair any leaks before proceeding.
Boiler heating surfaces
1. Disconnect the vent pipe at the boiler inducer outlet
connection after turning off power to the boiler.
❏
Inspect . . .
Reported problems
Inspect any problems reported by owner and correct
before proceeding.
Boiler area
1. Verify that boiler area is free of any combustible
materials, gasoline and other flammable vapors
and liquids.
2. Verify that boiler area (and air intake) is free of any
of the contaminants listed in Table 1 on page 9 of
this manual. If any of these are present in the boiler
intake air vicinity, they must be removed. If they
cannot be removed, isolate the boiler and provide
outside combustion air. See national, provincial or
local codes for further information.
40
2. Use a bright light to inspect the flue pipe interior
and inducer interior.
3. Inspect the boiler vent outlet area and heating surfaces by looking through the opening.
4. If the vent pipe or inducer interior show evidence
of soot, follow Cleaning boiler heating surfaces
in this manual section to remove the flue collector
and clean the boiler if necessary after close inspection of boiler heating surfaces. If there is evidence
of rusty scale deposits, check the water piping and
control system to make sure the boiler return water temperature is properly maintained (per this
manual).
5. Reconnect vent to inducer outlet and replace all
boiler components before returning to service.
6. Check inside and around boiler for evidence of any
leaks from the boiler. If found, locate source of leaks
and repair.
Part Number 550-110-290/0107
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10b
❏
Service and maintenance – annual start-up (cont.)
Inspect . . .
Burners and base
The boiler contains ceramic fiber and
fiberglass materials. Use care when handling these materials per instructions
on page 68 of this manual. Failure to
comply could result in severe personal
injury.
If insulation is damaged or displaced, do
not operate the boiler. Replace or reposition insulation as necessary. Failure to
replace damaged insulation can result
in a fire hazard, causing severe personal
injury, death or substantial property
damage.
1. After turning off power to the boiler, remove the base burner
shield (Figure 37, item 4, page 60).
2. Inspect burners and all other components in the boiler
base.
3. If burners must be cleaned see Burner cleaning instructions
below.
4. Inspect the slotted jacket cooling openings in the bottom left
and right of the base pan (Figure 37, item 7, page 60).
5. Inspect the base insulation. Pay attention to the WARNING on
page 68 regarding working with insulation materials. Verify
that the insulation is intact and secure against all four sides
of the base.
Burner cleaning instructions
Airborne materials, such as fiberglass and
dust, are present during construction and
remodeling. These materials can be drawn in
with the combustion air and obstruct burner
ports, resulting in carbon monoxide production, a fire hazard, or building freeze damage.
Read and follow the WARNING on page 9.
Failure to inspect and clear gas burner ports
could result in severe personal injury, death
or substantial property damage.
3. If any port is not completely clear, run a vacuum at the burner
inlet while cleaning the burner ports with a wire brush. The
vacuum will help to draw any airborne material out of the
burner.
4. Reinstall components, starting with the burner tray, then the
pilot bracket assembly, burner baffle, and air inlet top and
front panels.
5. Follow the start-up procedure in the boiler manual.
Condensate drain system
1. Inspect condensate drain fittings and tubing. Verify that condensate can flow freely to drain.
❏
Service . . .
Inducer motor
1. With boiler power off, place a few drops of S.A.E. 20 motor
oil in each of the two oil cups.
Use only S.A.E. 20 motor oil to lubricate the
inducer motor. Do not use universal household oils. Motor could be damaged, resulting
in possible severe property damage.
Oiled-bearing circulators
1. The circulator shipped with the CGi boiler is water-lubricated.
No oiling is required.
2. Check other circulators in the system. Oil any circulators requiring oil, following circulator manufacturer’s instructions.
Over-oiling will damage the circulator.
❏
Start-up . . .
1. Perform all start-up procedures in Section 7 of this manual.
2. Verify cold fill pressure is correct and that fill system is working properly.
3. Verify antifreeze level (if used) is at the right concentration
and that inhibitor level is correct.
4. Check gas piping per manual Sections 5, and 7a, verifying no
indications of leakage and all piping and connections are in
good condition.
1. Remove burner shield and the base pan air baffle. Next remove
the pilot bracket assembly. Then remove the four screws securing the burner tray to the manifold and slide the burner
tray out under the manifold.
5. Read the Operating instructions (Section 9c of this manual or
on boiler label) applying to the boiler.
2. Inspect each burner to insure that every port is completely
open.
6. Start the boiler following the appropriate Operating instructions (Section 9c of this manual or on boiler label).
Part Number 550-110-290/0107
41
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
10b
Service and maintenance – annual start-up (cont.)
❏
Check/test . . .
Figure 31
Automatic air vent, typical
Gas piping
1. Sniff near floor and around boiler area for any indication of a gas leak.
2. Test gas piping using bubble test, per Section 5
of this manual, if there is any indication of a leak.
Cold fill and operating pressures
1. While the system is cold, note the pressure reading
on the boiler pressure/temperature gauge. Verify that
cold fill pressure is correct.
2. Watch the pressure as the boiler and system heat
up to ensure pressure rise is normal. Too high a rise
would indicate a waterlogged or undersized expansion tank.
Air vents and air elimination
1. Inspect automatic air vents (if used). Also inspect
air separators to ensure they are operational.
2. The cap must be unscrewed one turn to allow air to
escape.
3. See Figure 31. If the air vent is leaking, remove cap
A and briefly push valve B and then release to clean
the valve seat.
4. Replace cap A by twisting all the way onto valve B
and then unscrewing one turn.
42
Limit controls and cutoffs
1. Inspect and test the boiler limit control. Verify operation by turning control set point below boiler
temperature. Boiler should cycle off. Return dial to
original setting.
2. Inspect and test additional limit controls or low
water cutoffs installed on system.
Expansion tank
1. Expansion tanks provide space for water to move
in an out as the heating system water expands due
to temperature increase or contracts as the water
cools. Only diaphragm-type or bladder-type tanks
should be used with CGt boilers. See Section 4 of
this manual for suggested best location of expansion
tanks and air eliminators.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
10b
Service and maintenance – annual start-up (cont.)
2. Diaphragm- or bladder-type expansion tanks
These tanks are welded gas tight with a rubber
membrane to separate the tank pressurizing air and
the water. May be located at any point in the system,
but most often found near the boiler.
• Systems with this type of expansion tank require
at least one automatic air vent, preferably located on top of an air eliminator, as shown in
examples in manual Section 4.
3. If relief valve has tended to weep frequently, the
expansion tank may be damaged or undersized.
• First, check tank size to be sure it is large
enough for the system.
• If size is too small, add additional tank(s) as
necessary to provide sufficient expansion.
• If tank size is large enough, remove tank from
system and check charge pressure (usually
12 psig for residential applications).
• If tank won’t hold pressure, membrane has
been damaged. Replace tank.
Boiler relief valve
1. Inspect the relief valve and lift the lever to verify
flow as in the following warnings, excerpted from
a relief valve manufacturer’s warning label. Before
operating any relief valve, ensure that it is piped
with its discharge in a safe area to avoid severe scald
potential. Read manual Section 4 before proceeding
further.
2. After following the above warning directions, if the
relief valve weeps or will not seat properly, replace
the relief valve. Ensure that the reason for relief valve
weeping is the valve and not over-pressurization of
the system due to expansion tank waterlogging or
undersizing.
Part Number 550-110-290/0107
Safety relief valves should be reinspected AT
LEAST ONCE EVERY THREE YEARS , by a
licensed plumbing contractor or authorized inspection agency, to ensure that the product has not
been affected by corrosive water conditions and to
ensure that the valve and discharge line have not
been altered or tampered with illegally. Certain
naturally occurring conditions may corrode the
valve or its components over time, rendering the
valve inoperative. Such conditions are not detectable unless the valve and its components are
physically removed and inspected. This inspection
must only be conducted by a plumbing contractor or authorized inspection agency — not by the
owner. Failure to reinspect the boiler relief valve as
directed could result in unsafe pressure buildup,
which can result in severe personal injury, death
or substantial property damage.
Following installation, the valve lever must be
operated AT LEAST ONCE A YEAR to ensure
that waterways are clear. Certain naturally occurring mineral deposits may adhere to the valve,
rendering it inoperative. When manually operating the lever, water will discharge and precautions
must be taken to avoid contact with hot water and
to avoid water damage. Before operating lever,
check to see that a discharge line is connected to
this valve directing the flow of hot water from the
valve to a proper place of disposal otherwise severe
personal injury may result. If no water flows,
valve is inoperative. Shut down boiler until a
new relief valve has been installed.
Figure 32 —
Relief valve,
typical
43
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
10b
Service and maintenance – annual start-up (cont.)
❏
Review with owner
1. Review the User’s Information Manual with the
owner.
2. Emphasize the need to perform the maintenance
schedule specified in the User’s Information
Manual (and in this manual as well).
3. Remind the owner of the need to call in a licensed
contractor should the boiler or system exhibit any
unusual behavior.
4. Remind the owner to follow the proper shutdown
procedure and to schedule an annual start-up at the
beginning of the next heating season.
2. Follow shutdown procedure.
3. Remove venting system connection to boiler.
4. Remove top jacket panel. Turn back insulation.
5. Remove collector box/transition assembly. Clean
sealant from assembly and sections.
6. Remove radiation plates hanging between sections.
7. Remove burners from base. Brush and vacuum
burners to remove all dust and lint. Verify that all
burner ports are free of debris.
8. Place newspapers in base of boiler to collect soot.
❏
Cleaning boiler
heating surfaces
The boiler contains ceramic fiber
and fiberglass materials. Use care
when handling these materials per
instructions on page 68 of this
manual. Failure to comply could
result in severe personal injury.
1. Shut down boiler:
• Follow “To Turn Off Gas to Appliance”
instructions on boiler and Operating instructions.
• Do not drain boiler unless it will be exposed
to freezing temperatures. If using antifreeze in
system, do not drain.
44
9. Clean between sections with wire flue brush.
10.Remove newspaper and soot. Vacuum or brush base
and surrounding area.
11.Reinstall radiation plates.
12.Replace collector box/transition assembly. Seal with
sealant. Obtain gas-tight seal to prevent flue gas
spillage and carbon monoxide emissions, resulting
in severe personal injury or death.
13.Replace insulation and jacket top panel.
14.Start up boiler following Section 7 of this manual
and the boiler Operating instructions, Section 9c. Excessive sooting indicates improper gas combustion. If found check for proper combustion and
make any necessary adjustments.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11a
Troubleshooting — procedure
Label all wires prior to disconnection when servicing controls. Wiring
errors can cause improper and dangerous operation.
Never jumper (bypass) rollout thermal fuse element or any other
device except for momentary testing as outlined in Troubleshooting
Charts. Severe personal injury, death or substantial property damage
can result.
Before troubleshooting:
1. Have the following items:
a. Voltmeter that can check 120 VAC and 24 VAC.
b. Microammeter with a minimum scale range of 0-25.
c. Continuity checker.
d. U-tube manometer.
2. Check for 120 VAC (minimum 102 VAC to maximum 132 VAC) to boiler.
3. Make sure thermostat is calling for heat and contacts (including appropriate zone
controls) are closed. Check for 24 VAC between thermostat wire nuts and ground.
Check the following:
1. Wire connectors to control module are securely plugged in at module and originating
control.
2. Air pressure switch hoses are properly and securely plugged in and are not damaged.
3. Gas pressures:
a. With boiler off — 13” w.c. maximum natural or propane gas pressure upstream of gas valve.
b. With boiler on:
• 5” w.c. minimum natural gas pressure or 11” w.c. propane gas pressure
upstream of gas valve.
• 3 ½” w.c. minimum natural gas pressure or 10” w.c. propane gas pressure
downstream of gas valve — Can be adjusted by regulator on gas valve.
Part Number 550-110-290/0107
45
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11b
Troubleshooting — components
Check pressure switch
setting
1. See Figure 33.
2. Remove both air pressure switch hoses from air
pressure switch.
3. Install tees and tubing as shown in Figure 33 to
inclined manometer.
4. Turn off gas valve and set thermostat to call for heat.
Inducer will run but burners will not ignite.
5. Check for 24 VAC between both air pressure switch
terminals.
6. If manometer reading is above the setpoint of the
switch, but there is not 24 VAC between both air
pressure switch terminals — replace air pressure
switch.
Pressure switch setpoint
1. The air pressure switch should drop out when the
pressure across switch is less than 1.53 inches w.c.
Figure 33 Manometer connections
Troubleshooting air pressure
reading
1. If manometer reading is lower than the setpoint of
the switch — check for possible causes:
• blockage in hoses
• obstruction in inducer housing outlet
• loose inducer wheel on motor shaft
• inducer motor not in proper rpm
• inducer back plate not sealed properly
• blockage in block assembly
• blockage in flue pipe or termination
• incorrect pressure switch
Return to normal operation
When pressure reading is correct and air pressure switch
is operating properly — remove tees and reinstall hoses
to air pressure switch.
The boiler will not operate correctly
unless pressure switch hoses are correctly located. The red hose connects
from the right side (negative) hose
barb to the flue collector. The white
hose connects from the left side
(positive) hose barb of the switch
to the connector box (between flue
collector and inducer) as shown in
Figure 33.
Ambient temperature switch
The ambient temperature switch wires into the boiler
limit circuit. If the temperature in the vicinity of the
switch exceeds 135°F, the switch will shut down the
boiler.
If the switch shuts down the boiler, check the reason for
the high temperature in the space. Increase the size of
the ventilation air openings if necessary.
46
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11b
Troubleshooting — components
(continued)
Control module
Solder or water splatter between plugs and circuit board
can cause improper operation of control module. Place a
shield over the boiler internal controls and components
during installation. Failure to comply could result in
severe personal injury, death or substantial property
damage.
Figure 34 Control module
Make sure ground wiring is installed per wiring
diagram. Good grounding is extremely important for
proper operation.
Control indicator lights —
LOCKOUT modes
See Charts 1 through 7 in this section for detailed troubleshooting procedures.
To reset control after a lockout, turn off power at the 120 VAC
service switch or turn down all thermostats. Wait 45 seconds.
Then restore power or call for heat.
POWER light flashing alone
Usually indicates reversed polarity of 120 VAC power wires.
POWER and TSTAT CIRC lights flashing
Usually indicates stray voltage on external thermostat circuit
wires (usually due to miswired 3-wire zone valve).
POWER and PRESS SWITCH lights flashing
Usually indicates pressure switch is closed when it should
not be, or pressure switch failed to close within 5 minutes of
inducer starting.
POWER and FLAME lights flashing
3-Way valve
Usually indicates false flame sense or flame sensed when it
shouldn’t be there.
The 3-way valve redirects flow in the circuit. Normally,
the valve allows water to flow through the boiler and
the heating system. But, if the tankless heater low limit
control senses water temperature below its setting during a domestic water demand, the 3-way valve actuator
should change the valve so all flow goes through boiler,
with no flow through heating system. Check valve operation as follows:
Tankless low limit calls for heat, but boiler does not
turn on — Check power to 3-way valve and valve end
switch.
Tankless low limit calls for heat, boiler turns on, but
there is not enough domestic water supply — Check
3-way valve. It may be stuck in the space heating position.
Thermostat calls for heat, boiler turns on, but there is no
flow of hot water to the space heating system — Check
whether 3-way valve is stuck in domestic water heating
position. Verify valve is installed and wired correctly.
Control indicator lights —
NONLOCKOUT modes
POWER light on and FLAME light flashing
Usually indicates pilot flame was not established within 15
seconds from application of spark. Control will flash light, but
will continue to cycle indefinitely until flame is established or
problem is corrected.
POWER light on and PRESS SWITCH light flashing
Usually indicates pressure switch opened during the run
cycle.
Troubleshooting the control module
See Figure 35, page 48, for location of harness plug receptacles and plugs on the control module.
Part Number 550-110-290/0107
47
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11b
Troubleshooting — components
(continued)
Figure 35 Control module connections
48
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11c
Troubleshooting — control module lights
CHART 1— Troubleshooting POWER light status
— Usually indicates reversed 120 VAC polarity if POWER light flashes by itself —
Electrical shock hazard — Wherever you see TURN OFF POWER , follow the instructions. Failure to follow
instructions could result in severe personal injury, death or substantial property damage.
Is POWER light off?
No
• Make sure service switch or circuit breaker is on or
fuses are good.
• Remove 120 VAC IN plug (Figure 35, Item 3, page 48)
on control module.
• Using voltmeter, check across top and bottom pins of
120 VAC IN plug.
Yes
Is POWER light ...
Flashing
alone
On steady
(not flashing)
Flashing with
another light
TSTAT CIRC
light flashing
Chart
2
PRESS SWITCH
light flashing
Chart
3
Chart
5
FLAME
light flashing
Chart
4
Chart
6
For insufficient heat or no heat problem, go to
Chart 7, page 55, if POWER light is on steady,
with no other light flashing.
Does voltmeter indicate 120 VAC?
No
Yes
Problem is with incoming
electricity. Have licensed
electrician repair circuit.
• Reconnect 120 VAC IN plug.
• Remove 120 VAC IN transformer PRIMARY plug
(Figure 35, Item 2, page 48) on control module.
• Using voltmeter, check across top and bottom pins of
PRIMARY receptacle.
Does voltmeter indicate 120 VAC?
No
• Usually indicates polarity on incoming 120 VAC power
line is wrong.
• TURN OFF POWER at service switch or breaker,
then reverse the HOT and NEUTRAL wires entering the
boiler in the J-box.
• Restore POWER at service switch or breaker.
Is POWER light flashing now?
No
Boiler should now
operate normally.
Part Number 550-110-290/0107
Yes
Have system checked by a
licensed electrician. If
problem persists, call your
local Weil-McLain sales
representative.
Yes
Replace control module.
Retest.
• Reinstall 120 VAC transformer PRIMARY plug.
• Remove 24 VAC transformer plug (Figure 35, Item 5,
page 48) on control module.
• Using voltmeter, check pins of plug.
Does voltmeter indicate 24 VAC?
No
Yes
Replace transformer.
Retest and check for back
feed of voltage from
system wiring.
Replace control module.
Retest.
49
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11c
Troubleshooting — control module lights
(cont.)
CHART 2 — TSTAT CIRC & POWER lights flashing
— Usually indicates 48 VAC on thermostat circuit (stray voltage) —
Electrical shock hazard — Wherever you see sTURN OFF POWERs, follow the instructions. Failure to follow
instructions could result in severe personal injury, death or substantial property damage.
• Disconnect the two external wires connected to the boiler
thermostat leads (two black low voltage leads in J-box).
• If a voltage does occur under any condition, check and
correct the external wiring.
• Connect a voltmeter across these two incoming wires.
Close each thermostat, zone valve and relay in the external
circuit one at a time and check the voltmeter reading
across the wires.
• Once the external thermostat circuit wiring is checked and
corrected if necessary, reconnect the external thermostat
circuit wires to the boiler thermostat wires and allow the
boiler to cycle.
• There should NEVER be a voltage reading.
Did you find a voltage across the two external thermostat circuit wires?
Yes
• Leave external boiler thermostat connection wires
disconnected from boiler.
• Troubleshoot the external thermostat circuit until you find
the source of the stray voltage. (Pay close attention to
the wiring connections to 3-wire zone valves.)
• Correct the problem and repeat the voltmeter test above,
verifying there is no longer a voltage reading under any
condition in the external thermostat circuit.
• An isolating relay may be required.
• Boiler should now operate per the normal sequence of
operation shown in Figure 28, page 34.
50
No
• If no voltage is found under any condition of the external
thermostat circuit, connect the two boiler thermostat
connection leads together (or jumper the boiler aquastat
T-T terminals).
• Turn off power to the boiler for 1 minute.
• Turn on power and allow boiler to cycle.
Do the TSTAT and POWER lights still flash?
No
Yes
• Replace control module.
• Retest.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11c
Troubleshooting — control module lights
(cont.)
CHART 3 — PRESS SWITCH & POWER lights flashing
— Usually indicates pressure switch stuck closed or failed to make within 5 minutes —
Electrical shock hazard — Wherever you see TURN OFF POWER , follow the instructions. Failure to follow
instructions could result in severe personal injury, death or substantial property damage.
• Reset boiler control by turning off power at service switch or turning down thermostat for at least 45 seconds.
• Thermostat should call for heat and appropriate zone valves open.
Does inducer motor operate?
No
Yes
• Wait 45 seconds.
Does inducer motor operate?
No
Yes
• Remove INDUCER plug (Figure 35, Item 6, page 48)
from plug receptacle of control module.
• Place voltmeter leads across the 120 VAC N and
120 VAC H pins of the INDUCER receptacle (left column
center and right column bottom pins).
• Wait 5 minutes.
Is PRESS SWITCH light flashing?
No
Yes
Does the voltmeter indicate 120 VAC?
No
Yes
• Try reseating plug in
module receptacle and
restart.
• If inducer still does not
work, replace inducer
assembly.
• Retest.
• Remove one of the wires connected to the pressure
switch.
• Check continuity across the switch terminals.
• Boiler should be in
normal operating
sequence.
• Observe operation until
thermostat is satisfied
and inducer has
completed its post-purge
cycle.
Are vent or combustion air
passages blocked?
No
Yes
Does the ohmmeter indicate the switch is closed?
No
• Replace control
module.
• Retest.
Part Number 550-110-290/0107
Yes
• Check air pressure switch
per manual Section 11,
page 46.
• Replace if necessary.
• Retest.
• Clear passages and
recycle boiler.
• Recheck boiler operation.
51
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11c
Troubleshooting — control module lights
(cont.)
CHART 4 — FLAME & POWER lights flashing
— Usually indicates flame sensed when it shouldn't be there —
Electrical shock hazard — Wherever you see TURN OFF POWER , follow the instructions. Failure to follow
instructions could result in severe personal injury, death or substantial property damage.
Are manual main shutoff valve and gas valve open?
No
•
•
•
•
•
Yes
•
•
•
•
Turn off power to the boiler at service switch or breaker.
Wait at least 45 seconds.
Turn on power to boiler.
Restart boiler, following Operating instructions in this
manual (Section 9c).
• Look through the pilot inspection port to see if the pilot is
burning during the prepurge period (first 10 seconds of
operation).
Leave main manual gas valve closed.
Turn off power to boiler at service switch or breaker.
Wait at least 45 seconds.
Turn on power to boiler.
Restart boiler, following Operating instructions in this
manual (Section 9c).
Do FLAME and POWER lights still flash?
No
Is pilot burning during prepurge period?
Yes
No
Yes
• Replace control module.
• Retest.
• Allow boiler to continue cycling.
Are FLAME & POWER lights flashing?
No
•
•
•
•
•
52
TURN OFF POWER
to boiler at service switch
or breaker.
Open main manual gas
valve.
Turn on power to boiler
at service switch or
breaker.
Restart boiler per lighting
instructions.
Perform start-up
procedures in boiler
manual to verify proper
operation.
• Boiler may now be
operating
normally.
• Perform start-up
procedures in
boiler manual to
verify proper
operation.
Yes
• Replace gas valve.
• Retest boiler.
Are FLAME and POWER lights flashing?
No
Yes
• Replace control
module.
• Boiler should now
operate normally.
• Replace control
module.
• Retest.
• Original flashing
FLAME light
caused by gas
valve not
operating properly.
• Retest.
• See normal
sequence of
operation,
Figure 28,
page 34.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11c Troubleshooting — control module lights
(cont.)
CHART 5 — PRESS SWITCH light flashing and POWER light on steady
— Usually indicates pressure switch opened during run cycle —
— May also be caused by wind gusts in excess of 40 mph for non-direct vent sidewall-vented boilers —
Electrical shock hazard — Wherever you see TURN OFF POWER , follow the instructions. Failure to follow
instructions could result in severe personal injury, death or substantial property damage.
• Reset boiler control by turning off power at service switch or turning down thermostat for at least 45 seconds.
• Thermostat should call for heat and appropriate zone valves open.
Does blower motor operate?
No
Yes
• Remove INDUCER plug (Figure 35, Item 6, page 48)
from plug receptacle of control module.
• Place voltmeter leads across the 120 VAC N and
120 VAC H pins of the INDUCER receptacle (left column
center and right column bottom pins).
• Wait 5 minutes.
Is PRESS SWITCH light flashing?
Does the voltmeter indicate 120 VAC?
No
Yes
• Replace inducer
assembly.
• Retest.
• Remove one of the wires connected to the pressure
switch.
• Check continuity across the switch terminals.
Does the ohmmeter indicate the switch is closed?
No
• Inspect and check wire
harness from control
module to pressure switch.
• Reseat connector in control
module receptacle.
• If harness is intact and
properly seated, but
problem persists, replace
control module.
• Retest.
Part Number 550-110-290/0107
No
Yes
• Boiler should be in
normal operating
sequence.
• Observe operation until
thermostat is satisfied
and inducer has
completed its postpurge cycle.
Yes
Is vent blocked?
No
• Check air pressure switch per manual Section 11b,
page 46.
• Replace if necessary. Retest.
Yes
• Clear vent and recycle boiler.
• Recheck boiler operation.
53
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11c
Troubleshooting — control module lights
(cont.)
CHART 6 — FLAME light flashing and POWER light on steady
ALSO — Troubleshooting failure to establish main flame
Electrical shock hazard — Wherever you see TURN OFF POWER , follow the instructions. Failure to follow
instructions could result in severe personal injury, death or substantial property damage.
•
Are main manual shutoff valve and boiler gas valve open?
No
•
•
•
•
Yes
TURN OFF POWER to boiler at service switch or breaker.
Open main manual shutoff valve and boiler gas valve (per
Operating instructions in this manual).
Turn on power at service switch or breaker. A
No
•
•
Boiler should be in
normal operating
sequence.
•
Observe operation
until thermostat is
satisfied and blower
has completed its
post-purge cycle.
•
•
•
•
•
•
•
54
Yes
•
Verify inlet gas pressure at gas
valve:
Natural gas — 5.0" w.c. min/14.0"
w.c. max
Check the voltage across
terminals PV and PV/MV of
the gas valve.
•
TURN OFF POWER to
boiler at service switch or
breaker.
Remove burner shield (see
Figure 37, item 4, page 60,
for location).
Verify pilot gas line is not
kinked, obstructed or
damaged and is correctly
attached to pilot and gas
valve.
Verify pilot ignition electrode,
electrode ceramic and spark
lead wire from control are in
good condition. Spark gap
should be approximately 1/8".
Correct any above problems,
replacing pilot if burner or
wiring is damaged.
Reinstall burner shield to
operate boiler for retest after
any changes or corrections.
If none of the above corrects
problem, then replace the
control module and retest.
•
Make sure ground wire
terminal is securely fastened
to control module mounting
screw.
•
Check the voltage across
terminals MV and PV/MV of
the gas valve.
•
If the wiring from the
control module to gas
valve is intact, replace the
control module.
Retest.
•
Verify inlet gas pressure at gas valve:
Is gas present at gas valve inlet and
within above range?
Yes
Yes
Is 24 VAC present there?
Yes
No
Does FLAME light flash now?
No
Is pilot flame visible through inspection port?
Is 24 VAC present there?
No
Yes
No
Natural gas — 5.0" w.c. min/14.0" w.c. max
Is gas present at gas valve inlet and within above range?
•
Contact gas supplier to correct
pressure or gas supply.
•
TURN OFF POWER to boiler
at service switch or breaker.
Remove burner shield (see
Figure 37, item 4, page 60, for
location).
•
•
Verify pilot burner is securely
attached to pilot bracket, bracket
is securely attached to cross tie,
and there is no corrosion on the
parts which would affect the
ground path for flame sense.
Verify that pilot flame rod, flame
rod ceramic and lead wire from
control module to flame rod are in
good condition.
Correct any above problems,
replacing pilot if burner or wiring
is damaged.
•
•
•
•
•
No
•
•
Yes
TURN OFF POWER to boiler at service switch or breaker.
Check flame signal — Detach sense lead from ignition control
(Figure 35, item 8, page 48).
Connect negative lead of MICROAMMETER to control sense
terminal (Figure 35, item 8, page 48). Connect positive lead of
MICROAMMETER to sense wire.
DISCONNECT red wire connected to terminal MV of the gas
valve.
Turn on power to boiler and allow to cycle. As soon as pilot is
burning, the MICROAMMETER should read at least 1.0
microamp.
Is flame signal at least 1.0 microamp?
No
Yes
•
If none of the previous steps
(including replacing pilot)
corrects problem, then replace
the control module, reinstall
burner shield and retest.
•
If the wiring from the
control module to gas
valve is intact, replace the
control module and retest.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11c Troubleshooting — control module lights
(cont.)
CHART 7 — Insufficient heat or no heat to system (POWER light on steady)
Electrical shock hazard — Wherever you see TURN OFF POWER , follow the instructions. Failure to follow
instructions could result in severe personal injury, death or substantial property damage.
•
•
•
Has it been at least 5 minutes since setting thermostat to call for
heat? If not, wait 5 minutes. Is system heating?
Is thermostat set to call for heat? Remove thermostat wires at
boiler and check continuity across the two wires. If circuit isn't
closed, check external thermostat (zone valve, relay, etc.)
wiring. Correct problems and retry.
Reconnect external thermostat wiring at boiler.
Is boiler System circulator operating?
No
•
Is thermostat circuit closed (continuity across wires)?
No
Yes
•
•
Are all red lights off?
No
Yes
Wait 30 seconds.
Are all red lights off?
No
Remove CIRCULATOR harness plug from
CIRCULATOR plug receptacle (Figure 35, Item 7,
page 48). Check with voltmeter across pins of control
module receptacle.
Does voltmeter show 120 VAC across pins?
No
Boiler is in standby.
Set thermostat to call for heat
and recheck operation.
Verify Sequence of
operation, Figure 28,
page 34.
•
•
•
•
If you have sufficient heat — boiler should be in normal
operating sequence. (See normal sequence of operation,
Figure 28, page 34.)
If you have less than sufficient heat, first check 3-way valve to
be sure it is not diverting flow to tankless coil. If 3-way valve is
supplying tankless coil, check tankless limit to be sure it set
correctly. If 3-way valve and tankless heater low limit are set
and operating correctly —
No
•
•
Yes
Correct conditions and
recheck operation.
See Figure 28, page 34, for
normal sequence of
operation.
•
•
Check heat loss calculation
versus boiler size.
Clock gas input.
Are limit switch contacts closed?
Yes
No
No
•
•
Yes
Check ambient temperature
switch. If switch is open,
boiler room temperature is
too high. Check air
openings. Add additional
openings if needed to keep
room temperature within
limits.
Replace limit
switch.
Retest.
•
Check if 3-way valve is
allowing water to return to
boiler from the system. If not
replace 3-way actuator.
•
•
Replace control module.
Retest.
Check limit switch contacts
with continuity checker.
Are limit switch contacts
closed?
No
Yes
Check rollout switch continuity
— is switch closed?
No
Also check setting on limit switch (should be
above 140°F.).
Part Number 550-110-290/0107
Yes
• Replace rollout switch.
•
•
•
Is FLAME light on?
Wait for boiler water to cool to temperature 20 to 30 °F lower
than temperature set on limit switch.
No
•
•
Repair/replace
circulator. Retest.
Repair/replace wiring.
Retest.
Is LIMIT light on?
Is vent piping free of blockage?
•
•
Yes
Replace control module.
Retest.
•
Yes
Replace control
module.
Retest.
• Wait 5 minutes.
Yes
Yes
If rollout thermal fuse element has
opened, determine cause and correct
condition. Failure to do so will cause
severe personal injury, death or
substantial property damage.
•
Check any other limit
controls wired into
the limit circuit. If all
are OK, then replace
control module.
Retest.
55
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11d
56
Troubleshooting — common problems
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11d
Troubleshooting — common problems
Part Number 550-110-290/0107
(continued)
57
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
12a
Replacement parts
Section assembly............................................... 59
Base .................................................................. 60
Jacket ............................................................... 62
Trim................................................................... 64
Controls............................................................. 65
58
Replacement parts must be purchased through a local Weil-McLain
distributor. When ordering, specify boiler model and size and include
description and part number of replacement part. Results from using
modified or other manufactured parts will not be covered by warranty
and may damage boiler or impair operation.
Weil-McLain part numbers are found in Weil-McLain Boilers and
Controls Repair Parts Lists.
The boiler contains ceramic fiber and fiberglass materials. Use care when
handling these materials per instructions on page 68 of this manual.
Failure to comply could result in severe personal injury.
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
12b
Replacement parts — section assembly
Figure 36 Section assembly
Part Number 550-110-290/0107
59
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
12c
Replacement parts — base
Figure 37 Base assembly
60
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
12c
Replacement parts — base
(continued)
Item number Description
Base assembly kit (includes base panels items 1, 2, 3, 4, 5, 6 and 7)
Weil-McLain
part number
381-354-339
1
Base side panel (in Base assembly)
2
Base front cross-tie assembly (in Base assembly)
3
Base back cross-tie assembly (in Base assembly)
4
Burner shield (in Base assembly)
5
Base pan angle, left side (in Base assembly)
6
Base pan angle, right side (in Base assembly)
7
Base pan (in Base assembly)
7a
Base pan air baffle (in Base assembly)
8a
Burner mounting plate
450-003-692
8b
Rear spacing strip
550-320-162
8c
Nut, hex 5mm Zp
550-320-170
9
Base insulation kit
381-354-332
10
Boiler leg kit
550-320-219
11
Manifold
591-126-737
12
Main burner orifice — Natural gas, 2.7 mm
560-529-077
13
Burner
512-200-076
14
Screw, 10-32 x .0.38 STP type 23 hx, washer Hd slot
562-135-710
15
Rollout thermal fuse element
512-050-230
Part Number 550-110-290/0107
61
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
12d
Replacement parts — jacket
Figure 38 Jacket assembly
62
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
12d
Replacement parts — jacket
Item
number
Description
(continued)
Weil-McLain
part number
1
Junction box, 2 x 4 x 1.5
2
Jacket panel, left side, with insulation
381-355-741
3
Jacket panel, right side, with insulation
431-223-311
4
Jacket panel, top front, with insulation
381-355-420
5
Jacket panel, top rear, with insulation
381-355-742
6
Jacket panel, door
381-355-742
7
Jacket cross tie, bottom front
431-223-327
8
Jacket panel, rear, with insulation
381-355-559
9
Jacket panel, interior, with insulation
431-223-302
Gold touch-up paint, spray can
592-000-000
NS
Part Number 550-110-290/0107
Available locally
63
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
12e
Replacement parts — trim
Figure 39 Trim assembly
Item
Description
number
1
Drain valve, ¾" NPT/Bibb
2
3
4
5
6
7
8
9
10
11
13
15
16
17
18
19
20
21
22
23
24
25
64
Tee, 1" x ¾" x 1"
Nipple, 1¼" x 2¾" NPT
Nipple, 1¼" x 2" NPT
Circulator, pre-piped
(Circulator hardware kit includes 2 flanges, 2
nuts, 2 screws)
Circulator gasket, universal (2 per boiler)
Circulator wiring harness kit
(Molex for control end shipped loose)
Adapter, copper/NPT, 1" x 1"
Nipple, copper, 1" x cut to fit
3-Way valve actuator
3-Way valve body
Main wire harness controls to module
(see wiring diagram for connections)
Elbow, copper, 1"
Tee, 1" x 1" x 1", NPT
Bushing, 1” x ½” NPT
Combination pressure-temperature gauge,
3¹⁄₈" diameter, short shank
Nipple, 1" closing
Tee, 1¼" x 1¼" x 1" NPT
Nipple, 1¼" x 6"
Pressure relief valve, ASME, 30 PSIG, ¾" male
inlet
Pressure relief valve, ASME, 30 PSIG, ¾"
female inlet
(Fittings shown are factory-installed on boiler.)
Elbow, ¾" NPT, pre-piped
Nipple, ¾", pre-piped
Nipple, 1" x close NPT
Tee, 1” x 1” x ½” NPT
Manufacturer Manufacturer’s
part number
Conbraco
31-606-01
Hammond Vlv.
710
Matco-Norca
205F04
Watts
BD-2C
B&G
Taco
Weil-McLain
part number
511-210-423
511-246-392
511-246-392
511-246-392
561-541-245
561-326-601
561-326-598
NRF-22-103253 511-405-118
007
511-405-113
Weil-McLain
Weil-McLain
590-317-535
591-391-904
562-302-533
560-742-939
635-100-023
635-100-022
591-391-920
Honeywell
Honeywell
561-115-303
561-541-212
560-807-350
Weil-McLain
Conbraco
Watts
Conbraco
Watts
380-000-000
10-407-10
M330
10-408-05
335
561-326-500
561-541-248
561-326-625
511-546-920
511-546-924
561-115-295
561-326-395
561-326-500
561-541-216
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
12f
Replacement parts — controls
Figure 40 Gas control assembly
Item
Description
number
Manufacturer Manufacturer’s Weil-McLain
part number
part number
1
Gas valve, ½" x ½"
2
Pilot kit w/orifice & aluminum pilot gas tubing Weil-McLain
3
Control module
United
Technologies
4
Air pressure switch, 1.53" w.c.
Tri-Delta
5
Control transformer
6
Ambient temperature switch (bracket not
shown); 135°F; automatic reset
not
shown
Part Number 550-110-290/0107
Honeywell
VR8204A2001
White-Rodgers 36E36-266
511-044-381
511-044-381
511-330-080
1107-1
511-330-090
511-624-542
511-842-370
Therm-O-Disc
Tubing, air pressure switch, 0.12 I.D. silicone Lydall
red, to collector hood
white, to transition
60T21 314367
540-130-401
590-317-650
590-317-651
65
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
13a
Dimensions
Figure 41 Dimensional drawing
66
Part Number 550-110-290/0107
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
13b
Ratings
DOE
Table 9 Boiler ratings
Boiler
model
number
DOE
Heating
capacity
(Btuh)
Input
(Btuh)
Output
(Btuh)
(Note 1)
CGt-PIN
Notes
108,000
Boiler
water
content
(gallons)
DOE
Seasonal
efficiency
(% A.F.U.E)
Vent size
Direct
exhaust
(Note 2)
133,000
108,000
94,000
Chimney
draft
(Note 3)
3.1
81.0
3"
5"
1. Based on standard test procedures prescribed by the United States Department of Energy.
2. Net I=B=R ratings are based on net installed radiation of sufficient quantity for the requirements of the building and nothing need be added for normal piping and pickup. Ratings are based on a piping and pickup
allowance of 1.15. An additional allowance should be made for unusual piping and pickup loads.
3. Direct exhaust CGt boilers require special venting, consistent with Category III boilers. Use only the vent
materials and methods specified in this manual. Chimney draft vented CGt boilers may use type B vent or
other materials suitable for venting Category I boilers.
Net
I=B=R
ratings
(Btuh)
CGt boilers for residential radiant panel systems, converted gravity heating systems or other low water temperature applications should be installed with balancing valves and bypass piping equal to the supply and return
size to avoid excessive flue gas condensation due to lower operating water temperatures. For alternate piping,
contact your Weil-McLain sales office.
CSA design certified for installation on combustible flooring.
Tested for 50 psi working pressure.
Part Number 550-110-290/0107
67
GOLD CGt Gas-Fired Water Boiler — Boiler Manual
Handling ceramic fiber and fiberglass materials
REMOVAL OF COMBUSTION CHAMBER
LINING OR BASE PANELS
The combustion chamber lining or base insulation panels in this product contain ceramic fiber materials. Ceramic fibers can be converted to
cristobalite in very high temperature
applications. The International Agency
for Research on Cancer (IARC) has
concluded, “Crystalline silica inhaled in
the form of quartz or cristobalite from
occupational sources is carcinogenic to
humans (Group 1).”:
Precautionary measures
❏ Avoid breathing fiberglass dust and contact with skin
or eyes.
• Use NIOSH certified dust respirator (N95). This type of respirator is based on the OSHA requirements for fiberglass wool at the time this document was written. Other types of
respirators may be needed depending on the job site conditions. Current NIOSH recommendations can be found on the NIOSH web site at http://www.cdc.gov/niosh/homepage.html. NIOSH approved respirators, manufacturers, and
phone numbers are also listed on this web site.
• Wear long-sleeved, loose fitting clothing, gloves,
and eye protection.
❏ Apply enough water to the combustion chamber lining
or base insulation to prevent airborne dust.
❏ Remove combustion chamber lining or base insulation from the boiler and place it in a plastic bag for
disposal.
❏ Wash potentially contaminated clothes separately from
other clothing. Rinse clothes washer thoroughly.
NIOSH stated First Aid.
❏ Eye: Irrigate immediately.
❏ Breathing: Fresh air.
68
REMOVAL OF FIBERGLASS WOOL
or
INSTALLATION OF FIBERGLASS WOOL,
COMBUSTION CHAMBER LINING OR
BASE PANELS:
This product contains fiberglass jacket insulation and ceramic fiber
materials in combustion chamber
lining or base panels in gas fired
products. Airborne fibers from these
materials have been listed by the State
of California as a possible cause of
cancer through inhalation.
Precautionary measures
❏ Avoid breathing fiberglass dust and contact with skin
or eyes.
• Use NIOSH certified dust respirator (N95). This type of respirator is based on the OSHA requirements for fiberglass wool at the time this document was written. Other types
of respirators may be needed depending on the job site conditions. Current NIOSH recommendations can be found on the NIOSH web site at http://www.cdc.gov/niosh/homepage.
html. NIOSH approved respirators, manufacturers, and phone numbers are also listed on
this web site.
• Wear long-sleeved, loose fitting clothing, gloves,
and eye protection.
❏ Operations such as sawing, blowing, tear out, and
spraying may generate airborne fiber concentration
requiring additional protection.
❏ Wash potentially contaminated clothes separately
from other clothing. Rinse clothes washer thoroughly.
NIOSH stated First Aid.
❏ Eye: Irrigate immediately.
❏ Breathing: Fresh air.
Part Number 550-110-290/0107
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