Purge Air From Dhw System; Check Thermostat Circuit(S); Condensate Removal - Westinghouse WBRC 140 Series Installation, Start-Up, Maintenance, Parts, Warranty

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from the internal pump:
1. Use a flat head screwdriver and turn the pump bleed screw one
(1) turn counterclockwise.
2. When water comes out the pump has been bled.
3. Turn the screwdriver clockwise and reseat the bleed screw.
Figure 54 - Bleeding the Internal Pump
Run pumps as required to help bleed out all entrapped air. Some
good indicators that air is removed include the absence of gurgling
noises in the pipes and pump operation becoming very quiet.
Test mode will stop automatically after the set time (default is five
minutes), or press the button to leave it manually.
l. After the system has operated for some time, eliminate any residual
air by using the manual air vents located throughout the system.
m. If purge valves are not installed in the system, open manual air
vents in the system one at a time, beginning with the lowest floor.
Close vent when water squirts out. Repeat with remaining vents.
q. Refill to correct pressure.
F. Purge Air from DHW System
1. Make sure CH and DHW lines to the boiler are open and full of water.
Turn on all electric power to boiler.
WARNING
!
Ensure the boiler is full of water before firing the burner. Failure to do
so will damage the boiler. Such damage IS NOT covered by warranty,
and could result in property damage, severe personal injury, or
death.
2. Open hot water faucets in the DHW system. Start with the faucets
nearest the boiler.
3. Keep faucets open until water runs freely and all air is purged. Then
move on to faucets further away from the boiler in the system.
4. When water flows freely from all hot water faucets, DHW purging is
complete.
G. Check Thermostat Circuit(s)
1. Disconnect the two external wires connected to the boiler
thermostat terminals (low voltage terminal strip).
2. Connect a voltmeter across these two incoming wires with power
supplied to the thermostat circuits. Close each thermostat, zone valve
and relay in the external circuit one at a time and check the voltmeter
reading across the incoming wires.
3. There should NEVER be a voltage reading.
4. If a voltage reading does occur under any condition, check and
correct the external wiring. (This is a common problem when using
3-wire zone valves.)
5. Once the external thermostat circuit wiring is checked and corrected
if necessary, reconnect the external thermostat circuit wires to the
boiler low voltage terminal strip. Allow the boiler to cycle.
whl-648 Rev. 001 Rel. 003 Date 10.8.19
H. Condensate Removal
1. The boiler is a high efficiency condensing boiler. Therefore, the
unit has a condensate drain. Condensate fluid is nothing more than
water vapor, derived from combustion products, similar to that
produced by an automobile when it is initially started.
Condensation is slightly acidic (typically with a pH of 3 to 5) and
must be piped with the correct materials. Never pipe the condensate
using steel, copper, brass or other materials that will be subject to
corrosion. Plastic PVC or CPVC pipe are the only approved materials.
A condensate neutralizer, if required by local authorities, can
be made up of lime crystals, marble or phosphate chips that will
neutralize the condensate. This may be done by the installer or you
may purchase a condensate neutralizer from Westinghouse (7450P-
212).
2. The boiler is equipped with a ¾ female socket weld fitting
connection that must be piped to a local drain. It is very important
that the condensate line is sloped downward away from the boiler
to a suitable inside drain. If the condensate outlet on the boiler is
lower than the drain, you must use a condensate removal pump,
available from Westinghouse (554200). This pump is equipped with
two leads that can be connected to an alarm or another type of
warning device to alert the user of a condensate overflow, which, if
not corrected, could cause property damage.
3. If a long horizontal run is used, it may be necessary to create a vent
in the horizontal run to prevent a vacuum lock in the condensate
line.
4. Do not expose the condensate to freezing temperatures.
5. It is very important you support the condensation line to assure
proper drainage.