Weil-McLain Aqua Balance WMB-155 Manual page 114

W
TM
AquaBalance
35 Maintenance
C
ombi 80/120 flat plate heat
exchanger removal for cleaning
5. Release the pressure of CH circuit by loosing the plastic
screw placed next to the CH return (6), see Figure 151.
Release Heat Exchanger pressure in the
boiler by loosing the plastic screw of the pump
placed next to heat exchanger return.
Figure 151
Pressure release for domestic water
circuit (Combi Only 80/120 shown)
2
3
1
1 System supply
2 Domestic hot water outlet
3 Gas inlet
6. For the Combi Only 80/120, remove the two (2) screws
securing the plate heat exchanger to the diverter valve
and to the DHW inlet.
7. Pull out the flat plate heat exchanger pulling out and
up from the side or front of the boiler.
The gas valve does NOT need to be
removed to replace brazed plate heat
exchanger
Figure 152 Removal of flat plate heat exchanger
(screw on left side) (Combi Only 80/120
shown)
114
M -
ALL OUNT GAS FIRED WATER BOILER
(continued)
4
5
6
4 Domestic cold water inlet
5 System return
6 Pressure relief screw
—
Boiler Manual
Figure 153 Removal of flat plate heat exchanger
(screw on right side) (Combi Only 80/120 shown)
C
ombi 155 flat plate heat exchanger
removal for cleaning
1. For the Combi-155, release the pressure from system.
2. Release residual pressure in domestic hot water circuit in the boiler
by opening a hot water tap downstream of the boiler.
3. Loosen four (4) fittings of brazed plate heat exchanger to the
DHW Outlet (diverter valve - left side) and to the DHW Inlet
(right side), see Figure 155, these release the brazed plate heat
exchanger. Pull out the flat plate heat exchanger pulling out and
up from the rear of the boiler. (The left jacket panel and blower
motor maybe removed to facilitate removal).
The gas valve does NOT need to be removed to
replace brazed plate heat exchanger
4. Flat plate heat exchanger can be immersed in a chemical clean-
ing bath.
Figure 154 Domestic water circuit on the Combi-155
2
1
1 System supply
2 Domestic hot water outlet
3 Gas inlet
4
3
5
4 Domestic cold water inlet
5 System return
Part number 550-100-305/0118