16
10.
Water Piping
his a
liance is suita le for com ination ota le ater and s ace heatin a
lications. t cannot e used for s ace
heating applications only. Do not use this appliance if any part has been underwater. Immediately call a quali
fi
ed
service technician to ins ect the a
liance and re lace an art of the control s stem and as control hich has
een under ater.
If the water heater is installed in a closed water supply system, such as one having a back
fl
ow preventer in the
cold ater su
l line means shall e rovided to control thermal e
ansion. Contact the ater su
lier or a local
lum in ins ector on ho to control this situation.
ressure relief valve must e installed near the hot ater outlet that is rated in accordance ith and com l in
ith either he Standard for elief Valves and utomatic Shutoff Devices for Hot Water Su
l S stems
S
21.22 or he
S
S
oiler and ressure Vessel Code Section V (Heatin oilers). his ressure relief
valve must e ca a le of an hourl tu rated tem erature steam dischar e of 1
00 tuh. ulti le valves ma e
used. he ressure relief ca acit must not e ceed 1 0 si . o valve shall e laced et een the relief valve and
the ater heater. he relief valve must e installed such that the dischar e ill e conducted to a suita le lace for
dis osal hen relief occurs. o reducin cou lin or other restriction ma e installed in the dischar e line. he
dischar e line must e installed to allo com lete draina e of oth the valve and the line. f this unit is installed ith
a se arate stora e vessel the se arate vessel must have its o n tem erature and ressure relief valve. his valve
must also com l ith he Standard for elief Valves and utomatic as Shutoff Devices for Hot Water Su
l
S stems
S 21.22. (in the U.S. onl ). tem erature relief valve is not re uired ut if one is used do not install
the valve with the probe directly in the
fl
ow of water. This may cause unwarranted discharge of the valve.
i in and com onents connected to the ater heater shall e suita le for use ith ota le ater.
o ic chemicals such as those used for oiler treatment shall not e introduced into the ota le ater.
ater heater used to su
l ota le ater ma not e connected to an heatin s stem or com onents
reviousl used ith a non ota le ater heatin a
liance.
When ater is re uired in one art of the s stem at a hi her tem erature than in the rest of the s stem means
such as a mi in valve shall e installed to tem er the ater to reduce the scald ha ard.
Installation and service must be performed by a quali
fi
ed plumber. In the
Common ealth of assachusetts this roduct must e installed
a licensed
plumber or gas
fi
tter in accordance with the Massachusetts Plumbing and Fuel
as Code 248 C
Sections 2.00 and .00.
serve all a
lica le codes.
lush ater throu h the i e to clean out metal o der sand and dirt efore connectin it.
erform the follo in insulation measures for revention of free in .
-
a e a
ro riate heat insulation measures (e. . ra
in ith heat
insulation materials usin electric heaters) accordin to the climate
of the re ion to revent the i e from free in .
-
a e sure that there are no ater lea s from the cold and hot ater
su
l i es then insulate the i es com letel .
-
e sure to also com letel insulate the ater su
l valve and the
cold and hot water connections on the water heater (refer to the
fi
g
-
ure on the ri ht).
- Do not cover the ater drain lu ith insulation so that ater in the
pipe can be drained. (Refer to the
fi
gure in the right.)
Use a union coupling or
fl
exible pipe for connecting the pipes to reduce the force applied to the piping.
Do not use i in ith a diameter smaller than the cou lin .
When feed ater ressure is too hi h insert a de ressuri in valve or ta e ater hammer revention measure.
• Avoid using joints as much as possible to keep the piping simple.
void i in in hich an air holdu can occur.
f installin the unit on a roof:
out lo er-level hot ater su
l
f the unit is installed on a roof to su
l ater to the levels elo
ma e sure that the ater ressure su
lied
to the unit does not dro elo 2 si. t ma e necessar to install a um s stem to ensure that the ater
ressure is maintained at this level.
Chec the ressure efore uttin the unit into o eration.
ailure to su
l the ro er ressure to the unit ma result in nois o eration shorter lifetime of the unit and
ma cause the unit to shut do n fre uentl .
Com letel insulate
the ater inlet and
outlet fittin s.
nsulate the ater
su
l valve com letel .
Do not cover the ater
drain lu ith
insulation
so that ater in the i e
can e
drained.
