Laars mascot ft MFTHW, Installation And Operation Instructions Manual

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LAARS Heating Systems
Page 76
8.2 Flushing the Boiler
- Flushing the Boiler
Flushing the Heat Exchanger of boiler is a complicated procedure. Refer to the following instructions carefully
before attempting the procedure. If you do not understand about the procedure, contact an authorized techni-
cian or licensed professional. Keep in mind that improper maintenance can void your warranty.
1. Disconnect electric power to the boiler.
2. Close the shutoff valves on both hot water outlet
and cold water inlet lines. (V1 & V2)
3. Connect one hose “D1” to the valve “V3” and
place the free end in the bucket. Connect one
of the hoses “D3” to the circulation pump outlet
and the cold water inlet line at the valve “V4”.
Connect other hose “D2” to the circulation pump
inlet and place the free end in the bucket.
4. Pour the cleaning solution into the bucket.
Place the drain hose (D1) and the hose (D2) to the
pump inlet into the cleaning solution.
5. Open service valves (V3 & V4) on the hot water
outlet and cold water inlet lines.
6. Turn on the circulation pump (Operate the pump and
allow the cleaning solution to circulate through the
boiler for at least 1 hour at a rate of 4 gallons per
minute.)
7. Rinse the cleaning solution from the boiler as follows:
- Remove the free end of the drain hose (D1) from
the bucket.
- Close service valve, (V4), and open shut off valve,
(V2).
Do not open shut off valve, (V1).
- Allow water to flow through the boiler for 5 minutes.
- Close shut off valve (V2).
8. Disconnect all hoses.
9. Remove the cold water inlet filter from the boiler and
clean out any residues.
10. Reinsert the filter and ensure the filter cap is
securely tightened.
11. Connect electrical power to the boiler.
V3
D3
D2
D1
V4
V2
V1