Noritz GHQ-C2801WX-FF US, Installation Manual, Page: 68 / 84

68
Internal Pump
Combi Boiler Air Vent Cap
[For adjusting to accommodate longer vent runs]
• When using PVC/CPVC/PP material
Change DIP switch #7 and #8 by following the table
below.
Vent length condition
DIP switches
#7 #8
①
Less than 33 ft using 2 in. (50 mm) pipe
○ ○
②
33 ft or more using 2 in. (50 mm) pipe
● ○
③
Less than 50 ft using 3 in. (75 mm) pipe
○ ●
④
50 ft or more using 3 in. (75 mm) pipe
● ●
ON =
●
/ OFF =
○
Refer to page 22 for more details on
①
to
④
.
• When using flexible pipe for chimney
Change DIP switch #7 by following the table below.
(DuraVent® - Flex Through Chimney w/ Air Intake
(Only 3 in.))
Vent
length
condition
DIP
switch
#7
Maximum equivalent
vent length*
V (Vertical)
+
H (Horizontal)
Equivalent
length
Short
length
○
< 50 ft (15 m)
Flexible pipe:
1 ft (0.3 m)
Rigid pipe:
1 ft (0.3 m)
90° elbow:
5 ft (1.5 m)
45° elbow:
3 ft (0.9 m)
Long
length
●
50 ft (15 m)–75 ft (22.5 m)
ON =
●
/ OFF =
○
* The maximum vent length includes elbows.
(Centrotherm® - Flex Through Chimney w/ Air Intake
(Only 3 in.))
Vent
length
condition
DIP
switch
#7
Maximum equivalent
vent length*
Equivalent
length
Short
length
○
Exhaust vent
V (Vertical) + H (Horizontal):
< 50 ft (15 m)
Air Intake:
< 50 ft (15 m)
Flexible pipe:
1 ft (0.3 m)
Rigid pipe:
1 ft (0.3 m)
90° elbow:
5 ft (1.5 m)
45° elbow:
3 ft (0.9 m)
Long
length
●
Exhaust vent
V (Vertical) + H (Horizontal):
50 ft (15 m)–75 ft (22.5 m)
Air Intake:
< 75 ft (22.5 m)
ON =
●
/ OFF =
○
* The maximum vent length includes elbows.
The installer should test operate the Combi Boiler,
explain to the customer how to use the Combi
Boiler, and give the owner this manual before
leaving the installation.
Water Filling for Combi Boiler and Heating System
The piping of the complete heating system, typical
Heating and DHW Diagram shown on page 71, must
be completed before filling the Combi Boiler with
water.
Never turn on the heat demand (T-T signal)
and fire up the Combi Boiler until the system is
filled with water completely.
NOTE • Even though this Combi Boiler is
equipped with an Auto Feeder
Valve function, it may not be
enough to fill the whole heating
system (e.g. pipes, appliance, each
zone) with water.
• The built-in Auto Feeder will be
used for filling primary loop and
maintaining the system pressure.
Therefore, Noritz recommends to
fill the whole heating system with
water and to purge all air from the
whole system manually.
DO NOT fire up the Combi Boiler
before filling the entire system.
There is a scald potential if the setting
temperature is too high.
DANGER
Be sure that the Combi Boiler, water pipes
and heating appliances are filled with water
completely before firing the Combi Boiler.
Make certain purge all air from the system.
Firing the Combi Boiler without filling water and
purging air may damage the Combi Boiler.
Failures and damages caused by improper
procedure are not covered by the Noritz
America limited warranty.
WARNING
1. Loose the Air Vent Cap on the internal pump of
the unit.
16 Water Filling and
Trial Operation
Setting the DIP Switches / Water Filling and Trial Operation