AHRI K2WT, Installation, Operating And Service Instructions

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XIII. Service and Maintenance
(continued)
Refer to Section VII “Venting” to re-assemble any vent system components that are disassembled during this inspection and
for details on supporting, pitching, and terminating the vent system.
s.
Replace any wiring
which has been disconnected.
t. Inspect the hydronic system . Look for leaks and repair any found. If system contains antifreeze, or other additives,
test and/or maintain them as directed by the additive manufacturer. Refer to Section XI “Start-up and Checkout” for
important information on boiler water and the use of boiler water additives.
nOTiCE
Do not remove return pipe connection from heat exchanger to service the circulator.
u. Test the flow switch . To do this:
• Start with the boiler in standby.
• Either close a shut-off in the boiler loop or unplug the boiler pump at connector L1. (see Figure 10.6)
• Initiate a call for heat and confirm that the boiler shows an Active Fault indicating that the flow switch is
open.
v. Follow ALL instructions in Section XI “Start-up and Checkout” to place the boiler back in service, including the
performance of a combustion test.
CaUTiOn
If burner comes on with no flow through the boiler, there is a problem with the flow switch. Turn the boiler
off immediately . Failure to do so could cause severe heat exchanger damage.