DeDietrich MCA Pro 115, Installation And Service Manual

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MCA Pro 45/65/90/115 MCA-Pro ISM Rv.4.1 2/2017
a vacuum cleaner or compressed air. Never use
compressed air to clean the burner if you are doing
this procedure inside a building.
3. In order to access the burner, the heat exchanger
cover will have to be removed by following the
procedure outlined on page 92.
4. Inspect and verify that the gasket is in good
condition and correctly positioned before replacing
the burner. Once the three retainer screws have
been tightened, bend up the retainer tabs as shown
below in order to prevent screw rotation.
5. Reinstall the cover plate using the procedure shown
on page 95.
6. After the servicing has been completed, reinstall all
the boiler components and retest the boiler.
Checking the boiler relief valve
1. Check the pressure relief valve and lift the lever to
verify the flow as in the following warnings, . Prior
to operating any relief valve, ensure that it is piped
with its discharge in a safe area in order to avoid
the potential for a severe scald. Refer to page 25
& 26 before proceeding any further.
DANGER
Pressure relief valve safety instructions
This device is designed for emergency safety
pressure relief and shall not be used as an operating
control. The safety pressure relief valve shall be
connected to the boiler with the valve in the vertical
position, directly onto the 3/4" street elbow which
is mounted directly into the 1 1/4" X 1 1/4" X 3/4 NPT
black iron malleable TEE fitting. Ensure the exit relief
port is connected to the second 3/4" street elbow
and ensure that this 3/4" street elbow is facing
downward.
Failure to comply with these instructions can
result in serious personal injury or death and/
or severe property damage.
WARNING
To avoid water damage or scalding due to valve
operation, discharge line must be connected to
valve outlet and run to a safe place of disposal.
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”/152 mm above the floor drain where any
discharge will be clearly visible. The discharge line
shall terminate through plain (unthreaded) pipe.
Discharge line material must conform to local
plumbing code or ASME requirements. No shutoff
valve shall be installed between the relief valve and
oiler, or in the discharge line.
WARNING
If discharge occurs, CALL A PLUMBER
IMMEDIATELY. A licensed contractor must evaluate
the system and determine the cause of discharge
and correct the cause immediately. Discharge may
indicate that an unsafe pressure condition exists
within the tank which requires immediate attention
by a licensed plumbing contractor.
WARNING
Following installation, the valve lever MUST be
operated AT LEAST ONCE A YEAR by the boiler owner
to insure 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 personal injury
may result. If no water flows, valve is inoperative.
CALL A PLUMBER IMMEDIATELY.
Notice
This valve must be installed by a licensed plumbing
contractor in accordance with these instructions.
Repair or alteration of valve in any way is prohibited by
national safety standards/local codes.
This boiler water safety relief valve is for protection
against excessive water pressure caused by thermal
expansion of the water. Although the valve also has an
emergency BTU steam discharge capacity if runaway
firing conditions occur, do not use for continuous steam
service.
WARNING
REINSPECTION OF SAFETY RELIEF VALVES;
Safety Relief Valves should be reinspected AT
LEAST ONCE EVERY THREE YEARS by a licensed
plumbing contractor or authorized inspection agency,
to insure that the product has not been affected by
corrosive water conditions and to insure 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.
Do not attempt to conduct this inspection on
your own. Contact your plumbing contractor for a
reinspection to assure continuing safety.
7. Checking and Maintenance