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Posted by Nikolay on December 06, 2013 at 11:27:01:
In Reply to: Re: LAARS Endurance EBP-175 posted by heatpro on December 04, 2013 at 22:11:15:
: The instructions on page 33 ofthe LAARS manual(look up by doing a web search for the model:
: 10.4 Insufficient Hot Water (EBP only)
: Possible cause:
: a. No flow restrictor (supplied with unit - field
: installed)
: b. Water flow switch failure
: c. Mixing valve setting or failure
: d. Domestic hot water (DHW) heat exchanger
: contamination
: The most common cause for insufficient hot
: water complaints results from failure to install a flow
: restrictor. The absence of a flow restrictor allows
: water to pass through the heat exchanger at a greater
: rate than the boiler output is capable of heating to the
: desired temperature.
: Failure of the water flow switch to operate
: during a hot water draw prevents boiler water from
: flowing through the DHW heat exchanger and therefor
: the DHW will not be heated.
Thank you for the info. I was also reading the manual and I am leaning towards "Flow Switch". "Flow Restrictor" shouldn't be the case as it has been operational for 8 years before this problem started. It doesn't happen all the time but occassionally. I found this below in the manual and it kind of makes me believe it is the "flow switch"
The EBP modulating combination boiler will
start from any of three input signals: (a)T-T closure
for space heating. (b)A demand for domestic hot
water, signaled by water flow activation of the water
flow switch. (c)A call for heat from the minimum
tank temperature sensor at 158°F (tank charge mode).