Part number 550-100-180/0917 5
Please read before proceeding
SlimFit®Series 2
COMMERCIAL CONDENSING GAS-FIRED WATER BOILER
— Boiler Manual
&AILURETOADHERETOTHEGUIDELINESBELOWCANRESULTINSEVEREPERSONALINJURYDEATHORSUBSTANTIALPROPERTY
DAMAGE
When servicing boiler —
r To avoid electric shock, disconnect all
electrical supplies to the boiler before
performing maintenance.
r To avoid severe burns, allow boiler to
cool before performing maintenance.
r is boiler contains ceramic ber and
berglass materials. Refer to the WARN-
ING and instructions on page87.
Boiler operation —
r Do not block flow of combustion or
ventilation air to boiler.
r Should overheating occur or gas supply
fail to shut o, do not turn o or discon-
nect electrical supply to pump. Instead,
shut off the gas supply at a location
external to the appliance.
Boiler water —
r e SlimFit heat exchanger is made of
aluminum, and requires that system
pH always be between 7.0 and8.5
and water chemistry be checked.
#HEMICALTREATMENTISREQUIRED3EE
page 79 for details.
r 4HOROUGHLYmUSHTHESYSTEM (with-
out boiler connected) to remove sedi-
ment.)NSTALLASTRAINEROROTHERSEDI-
MENTREMOVALEQUIPMENTif necessary.
e high-eciency heat exchanger can
be damaged by build-up or corrosion
due to sediment.
r Do not use petroleum-based cleaning
or sealing compounds in boiler system.
Gaskets and seals in the system may be
damaged. is can result in substantial
property damage.
r Continual fresh make-up water will
reduce boiler life. Mineral buildup in
heat exchanger reduces heat transfer,
overheats the aluminum heat exchanger,
and causes failure. Addition of oxygen
carried in by make-up water can cause
internal corrosion. Leaks in boiler or pip-
ing must be repaired at once to prevent
make-up water. Use this boiler ONLY in
a closed-loop system.
r Do not add cold water to a hot boiler.
ermal shock can cause heat exchanger
to crack.
Freeze protection fluids —
NEVER use automotive or standard glycol
antifreeze, even glycol made for hydronic
systems. Use only freeze-protection uids
recommended in this manual (see page79).
Follow all guidelines given. Thoroughly
clean and ush any replacement boiler sys-
tem that has used glycol before installing the
new SlimFit boiler.
Frozen Water Damage
Hazard
Residences or buildings that are unaended
in severely cold weather, boiler system
components failures, power outages, or
other electrical system failures could result
in frozen plumbing and water damage in a
maer of hours. For your protection, take
preventative actions such as having a security
system installed that operates during power
outages, senses low temperature, and initi-
ates an eective action. Consult with your
boiler contractor or a home security agency.
)FANYPARTOFABOILERBURNERORITSCONTROLSHAS
BEENSPRAYEDWITHORSUBMERGEDUNDERWATER
EITHERPARTIALLYORFULLY$/./4ATTEMPTTOOP-
erate the boiler until the boiler has been either
REPLACED OR COMPLETELY REPAIRED INSPECTED
ANDYOUARESURETHATTHEBOILERANDALLCOMPO-
NENTSAREINGOODCONDITIONANDFULLYRELIABLE
Otherwise, by operating this boiler, you will cause
a re or explosion hazard, and an electrical shock
hazard, leading to serious injury, death, or substantial
property damage. See the instructions at right.
3ALTWATER $AMAGE e exposure of boiler components to
saltwater can have both immediate and long-term eects. While the
immediate eects of saltwater damage are similar to those of fresh-
water (shorting out of electrical components, washing out of critical
lubricants, etc.), salt and other contaminants le behind can lead to
longer term issues aer the water is gone due to the conductive and
corrosive nature of the salt residue. erefore, Weil-McLain equip-
ment contaminated with saltwater or polluted water will no longer
be covered under warranty and should be replaced.
%LECTRICAL$AMAGE If any ELECTRICALCOMPONENT or wiring
came into contact with water, or was suspected to have come into
contact with water, replace the boiler with a new Weil-McLain boiler.
)NSTALLER Read all instructions, including this
manual and all other information shipped with the
boiler, before installing. Perform steps in the order
given.
5SER is manual is for use only by a qualied
heating installer/service technician. Refer to User’s
Information Manual for your reference.
5SER Have this boiler serviced/inspected by a
qualied 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 certicate on page117 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 led immediately against the transportation com-
pany by the consignee.
Commonwealth of
Massachusetts
When the boiler is installed within the Commonwealth of Massachuses:
r is product must be installed by a licensed plumber or gas er.
r If antifreeze is used, a reduced pressure back-ow preventer device shall be used.
r Sidewall vent air installations see instruction on page22.
