41
110327-04 - 1/22
ALTA
Combi Installation, Operating & Service Instructions
11
Domestic Water Piping
(continued)
NO
TICE
: Heating System piping omitted for clarity
.
NO
TICE
: Installer is r
esponsible for piping configurations to pr
ovide pr
oper flow rates and
meet local codes.
D
ANGER
Scald hazar
d.
Under cer
tain conditions this boiler can deliver domestic hot water
(DHW) at temperatur
es in excess of DHW setpoint in boiler contr
ol. A field supplied
ASSE 1070 listed anti-scald valve is r
equir
ed as par
t of this boiler’
s installation when
DHW r
ecir
culation issued.
C
A
UTION
Component Dama
g
e.
Excessive heat fr
om soldering could damage gaskets at connection between DHW
adapters and boiler
. Solder connections to DHW adapters befor
e installing gaskets.
!
!
Figur
e 1
1-3:
DHW Piping with R
ecir
culation
NO
TICE:
Additional wiring and contr
ol settings r
equir
ed for DHW
recir
culation:
•
Connect r
ecir
culation pump to "Aux Pump" ter
minals per Figur
e 13-2.
•
Connect jumper
, time of day clock or momentar
y push button to "Aux
T'Stat" ter
minals per Figur
e 13-3.
•
Secur
e r
ecir
culation temp sensor close to boiler on cold water line.
•
Connect r
ecir
culation temperatur
e sensor to "Header Sensor" ter
minals
per Figur
e 13-3.
•
T
ur
n DHW comfor
t mode "on". See Section 16 Operation and T
able 16-11.
NO
TICE:
W
ater filter to pr
event scale is str
ongly r
ecommended on the
potable cold water supply line to minimize sediment build up and loss of
per
for
mance of the plate heat exchanger
.
A
DHW
Pressure
Relief Valve
Drain
Valve
Buffer Tank
(2-6 Gal.)
(optional)
Drain
Valve
ASSE 1070 Listed
Anti-Scald Valve
(required)
Cold Water Supply
Recirc. Temp. Sensor
(P/N 108703-01)
Expansion Tank
(Req'd if cold water supply line
has check valve)
Flow Check
Valve
Recirc.
Pump
Hot Water
To Fixtures
*Supplied with boiler
DHW Strainer*
(inside boiler)
DHW Flow Limiter*
(inside boiler)
DHW Adapters*
(G 1/2" to 3/4" sweat)
Water Filter
Aqua Pure AP430SS or equivalent
(highly recommended)
Detail A
(Scale 1 : 4)
Cold Water Supply
Hot Water (From Boiler)
Hot Water To Fixtures
