Laars FTCF140 - Flushing or Draining

The FT Series Floor Standing, Combination Boiler
Page 75
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 shuto󰀨 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 lter 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 o󰀨 the gas valve.
4. Close water supply valve on the inlet to the appliance. If there is no valve, turn o󰀨 main water valve.
5. Open the hot water faucets completely.
6. To rell 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 o󰀨 valve, (V2).
Do not open shut o󰀨 valve, (V1).
- Allow water to ow through the combination boiler for 5
minutes.
- Close shut o󰀨 valve (V2).
V4
V2
V3
V1