Installation Guide

WHL-648 Rev. 000 Rel. 002 Date 1.3.18
60
G. Check Thermostat Circuit(s)
1. Disconnect the two external wires connected to the appliance
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
appliance low voltage terminal strip. Allow the appliance to cycle.
H. Condensate Removal
1. The appliance is a high eciency condensing appliance. Therefore,
the unit has a condensate drain. Condensate uid 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 appliance is equipped with a ¾ female socket weld tting
connection that must be piped to a local drain. It is very important that
the condensate line is sloped downward away from the appliance to a
suitable inside drain. If the condensate outlet on the appliance 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 overow, 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.
q. Rell to correct pressure.
F. Purge Air from DHW System
Ensure the appliance is full of water before ring the burner. Failure
to do so will damage the appliance. Such damage IS NOT covered
by warranty, and could result in property damage, severe personal
injury, or death.
1. Make sure CH and DHW lines to the appliance are open and full of
water. Turn on all electric power to appliance.
2. Open hot water faucets in the DHW system. Start with the faucets
nearest the appliance.
3. Keep faucets open until water runs freely and all air is purged. Then
move on to faucets further away from the appliance in the system.
4. When water ows freely from all hot water faucets, DHW purging is
complete.