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Pressure Drop in Feet of Head
Feedwater Regulator
-6NE6@G:8DBB:C9HI=6I6;::9L6I:GG:<JA6IDG7:>C
HI6AA:9 6C9 H:I 6I  EH> B>C>BJB EG:HHJG: 6I I=:
=><=:HIED>CID; I=:HNHI:B $CHI6AA 6 8=:8@K6AK: DG
768@ ;ADL 9:K>8: JEHIG:6B D; I=: G:<JA6IDG L>I= 6
B6CJ6AH=JID;;K6AK:6HG:FJ>G:97NAD86A8D9:H
Piping
AA=><=ED>CIHH=DJA97:K:CI:9+JG<:K6AK:H6C96
7NE6HH K6AK: H=DJA9 7: >CHI6AA:9  =:6I:G >CHI6AA:9
67DK:G69>6I>DCA:K:ABJHI7:EGDK>9:9L>I=6ADLL6
I:G8JID;;9:K>8:H6A:HDG9:GDEI>DC!/=:=:6I:G
L=:CJH:9>C8DCC:8I>DCL>I=6G:;G><:G6I>DCHNHI:B
BJHI7:>CHI6AA:9HDI=6II=:8=>AA:9B:9>JB>HE>E:9>C
E6G6AA:AL>I=I=:=:6I:GL>I=6EEGDEG>6I:K6AK:HIDEG:
K:CII=:8=>AA:9B:9>JB;GDB:CI:G>C<I=:=:6I:G
/=:E>E>C<HNHI:BD;6=DIL6I:G=:6I:G8DCC:8I:9ID
=:6I>C<8D>AHAD86I:9>C6>G=6C9A>C<JC>IHL=:G:I=:N
B6N7::MEDH:9ID8>G8JA6I>C<G:;G><:G6I:96>GBJHI7:
:FJ>EE:9L>I= ;ADL8DCIGDA K6AK:H DGDI=:G 6JIDB6I>8
B:6CH ID EG:K:CI <G6K>IN 8>G8JA6I>DC D; I=: =:6I:G
L6I:G9JG>C<I=:8DDA>C<8N8A:$I>H=><=ANG:8DBB:C9
:9I=6II=:E>E>C<7:>CHJA6I:9
Air-Separation/Expansion Tank
AA=:6I:GHH=DJA97::FJ>EE:9L>I=6EGDE:GANH>O:9
:ME6CH>DCI6C@ 6C9 6>G H:E6G6IDG ;>II>C<6H H=DLC >C
!><
Three-Way Valves
16AK:H 9:H><C:9 ID 7A:C9 L6I:G I:BE:G6IJG:H DG
G:9J8:L6I:G8>G8JA6I>DCI=GDJ<=I=:=:6I:GH=DJA9CDI
7:JH:9-6NE6@=:6I:GH6G:=><=G:8DK:GNADLB6HH
Fig. 10: Air-Separation/Expansion Tank
=:6I:GH L=>8= 6G: CDI HJ7?:8I ID I=:GB6A H=D8@
-6NE6@D;;:GH6;JAAA>C:D;:A:8IGDC>8H:FJ:C8:GHI=6I
EGD9J8: 9>G:8I G:H:I D; =:6I:G L6I:G I:BE:G6IJG:
-:;:GIDI=:DCIGDAHH:8I>DCD;I=:-6NE6@6I6AD<
Domestic Hot Water
2=:C9:H><C>C<I=:L6I:GE>E>C<HNHI:B;DG9DB:HI>8
=DIL6I:G6EEA>86I>DCHL6I:G=6G9C:HHH=DJA97:8DC
H>9:G:9/67A:$>C9>86I:HI=:HJ<<:HI:9;ADLG6I:H;DG
HD;IB:9>JB6C9=6G9 L6I:G26I:G =6G9C:HH>H:M
EG:HH:9>C<G6>CHE:G<6AADC
NOTE: BYPASS FOR
LOW TEMP SYSTEMS ONLY
SYSTEM SENSOR
(HEAT PUMP)
12” MAX
OR MIN FEASIBLE
5
’ MAX
5’ MAX
SYSTEM SENSOR
(4:1 TURNDOWN
OR GREATER)
Fig. 11: Single Heater - For Hydronic or Heat Pump
Primary/Secondary Piping
12” MAX
OR MIN FEASIBLE
SYSTEM SENSOR
(LESS THAN
4:1 TURNDOWN)
5’ MAX
5’ MAX
S
YSTEM SENSOR
(
4:1 TURNDOWN
OR GREATER)
Fig. 12: Dual Heaters (Reverse/Return)
with Primary/Secondary Piping