38
PHTM II
Combi Installation, Operating & Service Instructions
110331-07 - 8/23
10
Heating System Piping
(continued)
NO
TICE
: Domestic water piping omitted for clarity
.
NO
TICE
: Installer is r
esponsible for piping configurations to pr
ovide pr
oper flow rates and
meet local codes.
NO
TICE
: Primar
y-secondar
y piping is r
equir
ed.
C
A
UTION
Bur
n
Hazar
d.
P
roper
ty
Dama
g
e.
Under some conditions this boiler can deliver water to heating system that is significantly higher than boiler setpoint. Wher
e such overheat could cause personal
injur
y or pr
oper
ty damage (e.g. low temperatur
e radiant floor zones), pr
otect system
from excessive temperatur
es using tempering valves or other means.
C
A
UTION
Component
Dama
g
e.
Excessive heat fr
om soldering could damage gaskets at connection between low loss
header and boiler
. Solder connections to low loss header befor
e installing gaskets.
!
!
Figur
e 1
0-2:
Heating S
yst
em Piping
From System
To System
Temperature &
Pressure Gauge*
Drain Valve*
Cold Water Fill
Air Separator
Expansion Tank
Low Loss Header*
Fill Valve
Backflow
Preventer
Safety Relief Valve*
Dirt & Magnetic Filter
(highly recommended)
System Pump
w/ Integral Flow
Check Valve
System Pump
w/ Integral Flow
Check Valve
Manual Air Vent*
(inside boiler)
Boiler Pump*
(inside boiler)
* Supplied with boiler
Low Loss Header
Boiler Supply Connection
(G 3/4")
Boiler Return Connection
(G 3/4")
T&P Gauge
(1/4" NPT)
System
Return
(1-1/4" sweat)
Heating
System
Pump
To System
Optional Zone Valve
Controlled System
System Zone Valves
System
Supply
(1-1/4" sweat)
