Noritz NRCP982-DV - Operating Flow Chart

3
Operating Flow Chart
Standard mode
Recirculation mode
Hot Water
Col d W ater
Con densat e
Gas
Exhaust About 120℉ (49℃)
Water is heated
using the exhaust
gas which is about
400
℉(200℃).
Air & Gas
Mixing
Combusion gas about
400
℉ (200℃)
Primary heat
exchanger
Secondary heat
exchanger
Burner
Hot W ater
Recirculat ion Line
Condensate
Gas
Exhaust About 120℉ (49℃)
Water is heated
using the exhaust
gas which is about
400
℉ (200℃).
Air & Gas
Mixing
Combusion gas about
400
℉ (200℃)
Primary heat
exchanger
Secondary heat
exchanger
Burner
Condensate
Gas
Exhaust About 120℉
(49℃)
Air & Gas
Mixing
Combusion gas about
400
℉ (200℃)
Primary heat
exchanger
Secondary heat
exchanger
Burner
Reci r cu l at i on Li n e
Water is heated
using the exhaust
gas which is about
400
℉ (200℃).
This water heater is a highly efcient, fully condensing appliance. Unlike
a traditional tankless water heater, a condensing type captures heat
from the exhaust gas and uses it to preheat the incoming cold water as it
passes through the secondary heat exchanger as illustrated below.
Therecirculationpipemust
beinstalledintheeldin
ordertoapplythe‘External
RecirculationMode’.
Thismodeallowsthe
waterheaterrecirculation
pipestobewarmedup
andservingasthefreeze
protectionfunction.
Thismodeis
availablewithouta
recirculationpipe
installed.Thewater
heaterispreheated
andprotectedfrom
freezing.
ExternalRecirculationmode InternalRecirculationmode
Operating Flow Chart
Thecondensingtanklessgaswaterheaterdischargescondensate.
When heat from the exhaust gas
is collected within the secondary
heat exchanger, condensation
occurs from moisture in the
exhaust gas and the resulting
water is discharged from the drain
pipe (approx. 2 gallons/hour (7.5
liters/hour) maximum). It is not a
water leak. Do not plug or block
the drain line as it must always be
allowed to freely ow.
Note : The condensate discharged
is acidic with a pH level of
approximately 2-3. A condensate
neutralizer may be required by
local code prior to disposal.
Condensate Pipe
Condensate
comes out from
here.
Chapter1.–ProductOverview