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Maintenance procedures
— END OF SEASON
Perform DAILY and MONTHLY
procedures plus the following additional
procedures . . .
Check the boiler water and gas piping
1. Perform gas leak inspection per steps 1 through 7 of the
Operating Instructions, Figure 1, page 4.
2. If gas odor or leak is detected, immediately shut down boiler
following procedures in the Operating Instructions, Fig-
ure 1, page 4. Call a qualified service technician.
3. Visually inspect for leaks around internal water piping. Also
inspect external water piping, circulators, relief valve and
fittings. Immediately call a qualified service technician to
repair any leaks.
Have leaks fixed at once by a qualified service
technician. Failure to comply could result in severe
personal injury, death or substantial property dam-
age.
4. Reinstall the jacket door securely after inspections.
DIRECT VENT installations — The jacket door
must be securely sealed. See the WARNING on
page 12.
Operate the relief valve
1. Before proceeding, verify that the relief valve outlet has been
piped to a safe place of discharge, avoiding any possibility of
scalding from hot water.
To avoid water damage or scalding due to valve op-
eration, a metal discharge line must be connected to
relief valve outlet and run to a safe place of disposal.
This discharge line must be installed by a qualified
heating installer or service technician in accordance
with the instructions in the SlimFit Boiler Manual.
The discharge line must be terminated so as to
eliminate possibility of severe burns or property
damage should the valve discharge.
2. Read the boiler pressure/temperature gauge to make sure the
system is pressurized. Lift the relief valve top lever slightly,
allowing water to relieve through the valve and discharge
piping.
3. If water flows freely, release the lever and allow the valve to
seat. Watch the end of the relief valve discharge pipe to en-
sure that the valve does not weep after the line has had time
to drain. If the valve weeps, lift the seat again to attempt to
clean the valve seat. If the valve continues to weep afterwards,
contact your qualified service technician to inspect the valve
and system.
4. If water does not flow from the valve when you lift the le-
ver completely, the valve or discharge line may be blocked.
Immediately shut down the boiler, following the operating
instructions on page 9. Call your qualified service technician
to inspect the boiler and system.
Maintenance procedures
— EVERY 6 MONTHS
To continue operation for DHW
1. If the boiler is to supply heat for domestic hot water genera-
tion during the summer, no changes should be needed. Just
leave the boiler power on and allow the DHW storage tank
to call for heat as necessary.
2. Set back room thermostats to prevent any unnecessary call
for heat during the off season.
To leave boiler in stand-by mode
1. The SlimFit boiler’s Control provides effective features for
stand-by operation, including periodic exercising of the
boiler and system circulators and automatic operation of
the boiler at low fire if water temperatures drop too close to
freezing. Just configure the Control as needed to operate the
necessary circulators.
2. Leave the boiler power on and allow the Control to monitor
the boiler and system during the stand-by period.
The Control must be configured to operate all cir-
culators needed to ensure the system and all circuits
will be protected against freezing. See the SlimFit
Commercial Boiler manual for details.
3. Set back room thermostats to prevent any unnecessary call
for heat during the off season.
To shut down the boiler
1. Follow “TO TURN OFF GAS TO APPLIANCE” of the Op-
erating Instructions, Figure 1, page 4.
2. DO NOT drain the system unless exposure to freezing tem-
peratures will occur.
3. DO NOT drain the system if it is filled with an antifreeze
solution.
4. DO NOT shut down boilers used for domestic water heating.
They must operate year-round.
Part number 550-100-560/0321
15
SlimFit
®
Series 3
gas-fired water boiler
— User’s Information Manual
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