LAARS Heating Systems
Page 70
8.2 Flushing or Draining
Flushing the Heat Exchanger is a complicated procedure that should only be done by an authorized technician or
licensed professional. Keep in mind that improper maintenance can void your warranty.
1. Disconnect electric power to the combination 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.
8. Disconnect all hoses.
9. Remove the cold water inlet filter from the combination boiler and clean out any residues.
10. Connect electrical power to the combination boiler.
Draining the Combination Boiler.
1. Place a bucket under the appliance to collect the residual water inside the combination boiler.
2. Press Power button on the front control panel to turn OFF the electrical power to the combination boiler.
3. Turn off the gas valve.
4. Close water supply valve on the inlet to the appliance. If there is no valve, turn off main water valve.
5. Open the hot water faucets completely.
6. To refill the combination boiler, follow the steps of “Draining the Combination Boiler ” in reverse.
D3
D2
D1
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 combination boiler for at
least 1 hour at a rate of 4 gallons per minute.)
7. Rinse the cleaning solution from the combination 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 combination boiler for 5
minutes.
- Close shut off valve (V2).
V4
V2
V3
V1
Summary of Contents for MFTCF140
Page 48: ...LAARS Heating Systems Page 46 4 19 Control Board Electrical Diagram SECTION 4 Installation...
Page 65: ...Mascot FT Floor Standing Combination Boiler Page 63 6 2 Fault Tree Analysis 1 Flame detection...
Page 75: ...Mascot FT Floor Standing Combination Boiler Page 73...
Page 78: ...LAARS Heating Systems Page 76 Heat Exchanger MFTCF140...
