14
HOT WATER
OUTLET
TO TANK
INLET
CHECK
VALVE
MIXING
VALVE
COLD
WATER
INLET
TEMPERED WATER
OUTLET
12” TO 15”
(30-38 cm)
CHECK
VALVE
Figure 8
7KH1DWLRQDO6DQLWDWLRQ)RXQGDWLRQDOVRUHFRPPHQGVFLUFXODWLRQ
RI ) & ZDWHU 7KH FLUFXODWLRQ VKRXOG EH MXVW HQRXJK
WR SURYLGH ) & ZDWHU DW WKH SRLQW RI WDNHRII WR WKH
GLVKZDVKLQJPDFKLQH
$GMXVW ÀRZ E\ WKURWWOLQJ D IXOO SRUW EDOO YDOYH LQVWDOOHG LQ WKH
FLUFXODWLQJOLQHRQWKHRXWOHWVLGHRIWKHSXPS1HYHUWKURWWOHÀRZ
RQWKHVXFWLRQVLGHRIDSXPS6HHWKH:DWHU3LSLQJ'LDJUDPV
EHJLQQLQJRQSDJH
NOTE:
7RFRPSO\ZLWK16)6WDQGDUGLQVWDOODWLRQUHTXLUHPHQWV
WKHERWWRPRIWKHZDWHUKHDWHUPXVWEHVHDOHGWRWKHÀRRUZLWKD
VLOLFRQHEDVHGVHDODQWRUHOHYDWHGLQFKHVDERYHWKHÀRRU
CLOSED WATER SYSTEMS
:DWHU VXSSO\ V\VWHPV PD\ EHFDXVH RI FRGH UHTXLUHPHQWV
RU VXFK FRQGLWLRQV DV KLJK OLQH SUHVVXUH DPRQJ RWKHUV KDYH
LQVWDOOHG GHYLFHV VXFK DV SUHVVXUH UHGXFLQJ YDOYHV FKHFN
YDOYHVDQGEDFNÀRZSUHYHQWHUV'HYLFHVVXFKDVWKHVHFDXVH
WKHZDWHUV\VWHPWREHDFORVHGV\VWHP
THERMAL EXPANSION
$V ZDWHU LV KHDWHG LW H[SDQGV WKHUPDO H[SDQVLRQ ,Q D
FORVHGV\VWHPWKHYROXPHRIZDWHUZLOOJURZZKHQLWLVKHDWHG
$VWKHYROXPHRIZDWHUJURZVWKHUHZLOOEHDFRUUHVSRQGLQJ
LQFUHDVHLQZDWHUSUHVVXUHGXHWRWKHUPDOH[SDQVLRQ7KHUPDO
H[SDQVLRQFDQFDXVHSUHPDWXUHWDQNIDLOXUHOHDNDJH7KLV
W\SH RI IDLOXUH LV QRW FRYHUHG XQGHU WKH OLPLWHG ZDUUDQW\
7KHUPDOH[SDQVLRQFDQDOVRFDXVHLQWHUPLWWHQW7HPSHUDWXUH
3UHVVXUH 5HOLHI 9DOYH RSHUDWLRQ ZDWHU GLVFKDUJHG IURP WKH
YDOYH GXH WR H[FHVVLYH SUHVVXUH EXLOG XS 7KLV FRQGLWLRQ LV
QRW FRYHUHG XQGHU WKH OLPLWHG ZDUUDQW\ 7KH 7HPSHUDWXUH
3UHVVXUH5HOLHI9DOYHLVQRWLQWHQGHGIRUWKHFRQVWDQWUHOLHIRI
WKHUPDOH[SDQVLRQ
$SURSHUO\VL]HGDQGSUHVVXUL]HGWKHUPDOH[SDQVLRQWDQNPXVW
EHLQVWDOOHGRQDOOFORVHGV\VWHPVWRFRQWUROWKHKDUPIXOHIIHFWV
RIWKHUPDOH[SDQVLRQ&RQWDFWDORFDOSOXPELQJVHUYLFHDJHQF\
WRKDYHDWKHUPDOH[SDQVLRQWDQNLQVWDOOHG
6HH:DWHU/LQH&RQQHFWLRQVRQSDJHDQGWKH:DWHU3LSLQJ
'LDJUDPVEHJLQQLQJRQSDJH
MIXING VALVES
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or
showering.
Temperature limiting devices such as
mixing valves must be installed
when required by codes and to
ensure safe temperatures at fixtures.
:DWHUKHDWHGWRDWHPSHUDWXUHZKLFKZLOOVDWLVI\FORWKHVZDVKLQJ
GLVKZDVKLQJDQGRWKHUVDQLWL]LQJQHHGVFDQVFDOGDQGFDXVH
SHUPDQHQW LQMXU\ XSRQ FRQWDFW 6KRUW UHSHDWHG KHDWLQJ F\FOHV
FDXVHGE\VPDOOKRWZDWHUXVHVFDQFDXVHWHPSHUDWXUHVDWWKH
SRLQWRIXVHWRH[FHHGWKHZDWHUKHDWHU¶VWHPSHUDWXUHVHWWLQJE\
XSWR)&
6RPH SHRSOH DUH PRUH OLNHO\ WR EH SHUPDQHQWO\ LQMXUHG E\
KRW ZDWHU WKDQ RWKHUV 7KHVH LQFOXGH WKH HOGHUO\ FKLOGUHQ WKH
LQ¿UP DQG WKH SK\VLFDOO\PHQWDOO\ GLVDEOHG 7DEOH VKRZV WKH
DSSUR[LPDWH WLPHWREXUQ UHODWLRQVKLS IRU QRUPDO DGXOW VNLQ
,I DQ\RQH XVLQJ KRW ZDWHU SURYLGHG E\ WKH ZDWHU KHDWHU EHLQJ
LQVWDOOHG¿WVLQWRRQHRIWKHVHJURXSVRULIWKHUHLVDORFDOFRGH
RUVWDWHODZUHTXLULQJDFHUWDLQZDWHUWHPSHUDWXUHDWWKHSRLQWRI
XVHWKHQVSHFLDOSUHFDXWLRQVPXVWEHWDNHQ
,QDGGLWLRQWRXVLQJWKHORZHVWSRVVLEOHWHPSHUDWXUHVHWWLQJWKDW
VDWLV¿HVWKHGHPDQGRIWKHDSSOLFDWLRQD0L[LQJ9DOYHVKRXOGEH
LQVWDOOHGDWWKHZDWHUKHDWHUVHH)LJXUHRUDWWKHKRWZDWHU
WDSVWRIXUWKHUUHGXFHV\VWHPZDWHUWHPSHUDWXUH
0L[LQJYDOYHVDUHDYDLODEOHDWSOXPELQJVXSSO\VWRUHV&RQVXOW
D 4XDOL¿HG ,QVWDOOHU RU 6HUYLFH $JHQF\ )ROORZ PL[LQJ YDOYH
PDQXIDFWXUHU¶VLQVWUXFWLRQVIRULQVWDOODWLRQRIWKHYDOYHV
TABLE 6
:DWHU7HPSHUDWXUH
)&
7LPHIRUVW'HJUHH%XUQ
/HVV6HYHUH%XUQV
7LPHIRU3HUPDQHQW%XUQV
QG UG'HJUHH
0RVW6HYHUH%XUQV
QRUPDOVKRZHUWHPS
SDLQWKUHVKROG
PLQXWHV
PLQXWHV
PLQXWH
PLQXWHV
VHFRQGV
VHFRQGV
VHFRQGV
VHFRQGV
VHFRQG
VHFRQGV
instantaneous
VHFRQG
86*RYHUQPHQW0HPRUDQGXP&36&3HWHU/$UPVWURQJ6HSW
DISHWASHING MACHINES
$OO GLVKZDVKLQJ PDFKLQHV PHHWLQJ WKH 1DWLRQDO 6DQLWDWLRQ
)RXQGDWLRQ UHTXLUHPHQWV DUH GHVLJQHG WR RSHUDWH ZLWK ZDWHU
ÀRZSUHVVXUHVEHWZHHQDQGSRXQGVSHUVTXDUHLQFK
N3DDQGN3D)ORZSUHVVXUHVDERYHSRXQGVSHUVTXDUH
LQFKN3DRUEHORZSRXQGVSHUVTXDUHLQFKN3D
ZLOOUHVXOWLQLPSURSHUO\VDQLWL]HGGLVKHV:KHUHSUHVVXUHVDUH
KLJKDZDWHUSUHVVXUHUHGXFLQJRUÀRZUHJXODWLQJFRQWUROYDOYH
VKRXOG EH XVHG LQ WKH ) & OLQH WR WKH GLVKZDVKLQJ
PDFKLQH DQG VKRXOG EH DGMXVWHG WR GHOLYHU ZDWHU SUHVVXUH
EHWZHHQWKHVHOLPLWV
Summary of Contents for BTH 300
Page 66: ...66 WIRING DIAGRAM Figure 58 ...