Rinnai VC Series Installation And Operation Manual page 11

Maximum vent length
(indoor models only)
1. Determine the number of 90 degree elbows in
the vent system. (Two 45 degree elbows count as
one 90 degree elbow.)
2. Refer to the table to find the maximum vent
length based on the number of elbows.
Number of
90° Elbows
0
1
2
3
4
5
6
3. Adjust switch No. 1 in the SW1 DIP switch (tan
switches) if required by the applicable note.
1 If the length is greater than 21 (6.4 m) then
move switch No. 1 (SW1) to OFF.
2 If the length is greater than 15 (4.6 m) then
move switch No. 1 (SW1) to OFF.
3 If the length is greater than 9 (2.7 m) then move
switch No. 1 (SW1) to OFF.
4 Move switch No. 1 (SW1) to OFF.
Example: If you have one elbow then your maximum
vent length is 35 feet (10.7 m). If your
actual length is greater than 15 (4.6 m)
then move switch no. 1 (SW1) to OFF.
NOTICE
If you have a longer vent length (see above), switch
No. 1 is required to be in the OFF posi on. This
ensures the water heater will run properly. Blocked
flue diagnos c codes and shutdowns may result if
switch No. 1 is not in the correct posi on.
Maximum vent length
41 (12.5 m) 1
35 (10.7 m) 2
29 (8.8 m) 3
23 (7.0 m) 4
17 (5.2 m) 4
11 (3.4 m) 4
5 (1.5 m) 4
Freeze Protec on
Make sure that in case of freezing weather that the
water heater and its water lines are protected to
prevent freezing. Damage due to freezing is not
covered by the warranty.
Loss of freeze protec on may result in water damage
from a burst heat exchanger or water lines.
With electrical power supplied, the water heater will
not freeze when the outside air temperature is as cold
as –22°F (‐30°C) for indoor models or is as cold as –4°F
(‐20°C) for outdoor models, when protected from
direct wind exposure. Because of the "wind‐chill"
effect, any wind or circula on of the air on the unit
will reduce its ability to freeze protect.
The unit may be drained manually. However, it is
highly recommended that:
•
drain down solenoid valves are installed that will
automa cally drain the unit if power is lost.
These are available in a kit, 104000059. (The
condensate trap drain plug and water drain plug
are not affected by the auto drain down solenoid
valves and will have to be manually opened.)
•
a surge protector with terminals is installed which
allows the solenoid valves to operate if the unit is
disabled due to a diagnos c code. This is
available as 104000057.
In addi on, the solenoid valves should be connected
electrically to a surge protector with terminals. This
allows the solenoid valves to operate if the water
heater is disabled due to a diagnos c code.
The freeze protec on features will not prevent the
external piping from freezing. It is recommended that
hot and cold water pipes are insulated. Pipe cover
enclosures may be packed with insula on for added
freeze protec on.
In the event of a power failure at temperatures below
freezing the water heater should be drained of all
water to prevent freezing damage. In addi on, drain
the condensate trap and drain line.
VC Series Manual 11