Please Read Before Proceeding - Williamson-Thermoflo GWC-070 Manual

GWC -
gas fired water boiler

Please read before proceeding

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 dam-
age.
Indicates presence of hazards that can cause severe
personal injury, death or substantial property dam-
age.
Indicates presence of hazards that will or can cause
minor personal injury or property damage.
Indicates special instructions on installation, op-
eration or maintenance that are important but not
related to personal injury or property damage.
Installer— Read all instructions, including this
manual and all other information shipped with the
boiler, before installing. Perform steps in the order
given.
User — This manual is for use only by a qualified
heating installer/service technician. Refer to User's
Information Manual for your reference.
User — Have this boiler serviced/inspected by a
qualified service technician, at least annually.
Failure to comply with the above could result in
severe personal injury, death or substantial property
damage.
Write in the CP number in the space provided on
the Installation certificate on page 104 if not already
shown.
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.
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.
Commonwealth of Massachusetts
When the boiler is installed within the Commonwealth of Mas-
sachusetts, comply with the following.
• This product must be installed by a licensed plumber or gas
fitter.
• If antifreeze is used, a reduced pressure back-flow preventer
device shall be used.
• If sidewall vent or vent/air is installed, see instructions on
page 34.
Part number 550-142-056/0411
— Boiler Manual
When servicing boiler —
• To avoid electric shock, disconnect electrical supply
• To avoid severe burns, allow boiler to cool before
• This boiler contains ceramic fiber and fiberglass
Boiler operation —
• Do not block flow of combustion or ventilation air
•
•
Combustion air —
•
Carbon monoxide detector —
• For
• For
Boiler water —
• Thoroughly flush the system (without boiler con-
• Do not use petroleum-based cleaning or sealing
•
•
Freeze protection fluids —
• NEVER use automotive or standard glycol antifreeze.
Failure to adhere to the guidelines on this
page can result in severe personal injury,
death or substantial property damage.
before performing maintenance.
performing maintenance.
materials. Refer to the WARNING and instructions
on page 103.
to boiler.
Should overheating occur or gas supply fail to
, DO NOT turn off or disconnect electrical
shut off
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
. Immediately call a qualified service techni-
water
cian to inspect the boiler and to replace any part of
the control system and any gas control that has been
under water.
DO NOT install combustion air intake where there
is a risk of combustion air contamination
units, a carbon monoxide detec-
Direct Exhaust
tor is required in the boiler room. The carbon mon-
oxide detector must be wired on the same electrical
circuit as the boiler.
units, a carbon monoxide detector
Direct Vent
that is wired on the same electrical circuit as the boiler
is strongly recommended.
nected) to remove sediment. The high-efficiency heat
exchanger can be damaged by build-up or corrosion
due to sediment.
compounds in boiler system. Gaskets and seals in the
system may be damaged. This can result in substantial
property damage.
Leaks in boiler or piping must be repaired at once
to prevent make-up water. Use this boiler ONLY
Continual fresh make-up
in a closed-loop system.
water will reduce boiler life. Mineral buildup in heat
exchangers reduces heat transfer, overheats the mate-
rials, and causes failure. Addition of oxygen carried in
by make-up water can cause internal corrosion.
Do not add cold water to hot boiler.
can cause heat exchanger to crack.
Use only freeze-protection fluids made for hydronic
systems. Follow all guidelines given by the antifreeze
manufacturer. Thoroughly clean and flush any re-
placement boiler system that has used glycol before
installing the new boiler.
.
Thermal shock
5