Cleaning/Maintenance For Domestic Water Inlet & Outlet Manifolds - Weil-McLain Eco Tec 2 Series Manual

ECO ® Tec series 2 gas-fired water boiler – boiler manual
Cleaning/maintenance for Domestic Water Inlet & Outlet Manifolds
Brazed plate heat exchanger
reinstalled
Four (4) new gaskets must be placed in
the DHW inlet and DHW return plate
connections to seal brazed plate heat
exchanger.
service part numbers.
1. Slide the brazed plate heat exchanger into rear of enclosure
(ensure brazed plate is in proper orientation; label stating
"This side up" should be facing up).
2. Lift brazed plate heat exchanger slightly up and align
with DHW connections, reinstall the two (2) Allen head
screws, and tighten securely. (Torque to 31 lb-in. +/- 4
lb-in.).
Figure 140 Reinstallation of brazed plate gaskets to
brazed plate heat exchanger
Gaskets
When re-installing components, make sure
gaskets are in good condition and properly
aligned before tightening screws.
3. Open the valve of CH system supply (1) and return (5)
and fill the boiler with water. Purge all air from system.
Check all water joints and ensure no leaks are present.
4. Open valves of the domestic cold water inlet and the
domestic hot water outlet. Flush water through system
by opening a fixture. Check all water joints and ensure
no leaks are present.
5. Follow the operating instructions on page 123 to turn on
the gas supply and to restore the electrical power to the
boiler. The 3-way valve may be toggled back and forth to
bleed air from the system. Follow procedure 1 through 3
on page 134 under "3 way valve test". Be sure to reset and
clear any faults that may have occurred during this service.
156
See Figure 152, page 166 for
Gaskets
ECO Tec -620
Cleaning & Maintenance for Domestic
Water Inlet Manifold (Refer to Figure 141)
1. Follow "To turn off Gas Appliance" instructions on boiler and
Operating instructions and procedures 1-3 on page 155 "heat
exchanger and its serviceable components".
2. Remove the flow sensor electronic pickup attached, by carefully
lifting up and off of the flow transducer/turbine while keeping
the wire attached to the flow sensor electronic pickup.
3. Remove the flow transducer/turbine using an 18mm hexagonal
socket.
4. Detach the filter from the flow transducer/turbine, and clean
filter by using air or water to push through the inside of the filter,
opposite of normal flow. Be careful not to damage plastic filter.
5. Be sure to check the O-Ring and seat in the Inlet Manifold to
make sure that they are clean and in good condition. Replace
O-ring if damaged.
6. Reassemble flow transducer/turbine and filter, then reinsert flow
transducer/turbine into the block and tighten down to 8.9 lbs-ft
+/- 1.0 lbs-ft.
7. Re-connecting flow sensor electronic pickup to the flow
transducer/turbine by gently pushing it down on the flow
transducer/turbine. Make sure the wires are still connected to
the flow sensor electronic pickup.
8. When servicing the flow transducer/turbine and filter, it is
advised to inspect the by-pass filter.
9. Remove by-pass filter using 16mm (5/8") wrench. Clean the
by-pass filter with water if needed. Make sure by-pass is in good
working condition. Spring should be in relaxed state and in good
working order.
10. Re-insert by-pass and tighten down to 6.3 lbs-ft +/- 1.0 lbs-ft.
11. The boiler inlet water temperature sensor is located in this
manifold. Please refer to page 137 section "Checking temperature
sensors" to verify proper working condition.
Figure 141 Domestic Water Inlet Manifold components
Flow sensor
electronic
pickup
Inlet filter
Bypass
and
filter
Flow transducer
/turbine
Inlet
Manifold
Part number 550-100-270/0122