Slant/Fin VSL-160B Installation Instructions Manual Download Page 92

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14 - MAINTENANCE

14.10 - Draining the
heating side of the
boiler

To drain the heating side of the boiler
follow the steps below:
1. cool boiler turning knob “7” in

Figure 13-1 to 114°F

(45°C)

. Wait

until the display, item “1” in Figure
13-1, shows a temperature less
than 114°F

(45°C)

;

2. turn off the boiler;
3. shut off electrical power to the

boiler;

4. close the manual gas shutoff valve,

Figure 11-1;

5. close the boiler isolation valves,

in the heating system. If isolation
valves haven’t been installed, the
entire heating system will have to
be drained.

6. close the heating system fi ll valve;
7. follow the steps in Section 14.2,

to gain access the internal
components;

8. connect a hose to the boiler drain

valve intem “4” in Figure 7-6 and
7-7, and place the other end in a
sink or some other suitable drain;

9. open the boiler drain valve and

drain the boiler;

10. if boiler isolation valves have

not been installed in the heating
system open any bleed valves at
the highest point of the system;

11. after draining out all the water,

close the bleed valves and the
boiler drain valve;

NOTICE: The boiler cannot be
drained completely of water without
purging the unit with an air pressure
of 15 psi.

WARNING!!!

Do not

recover and/or re-use water
drained from the heating
circuit for any purpose as it
could be contaminated. Failure
to comply with this warning
can cause extensive property
damage, severe personal injury
or death!

14.11 - Draining the
domestic hot water
side of the boiler

To drain the domestic hot water side
of the boiler follow the steps below:
1. turn off the boiler;
2. close the valve in the water main

supplying the DHW system;

3. open all the hot and cold faucets in

the building;

4. if there isn’t a faucet or drain valve

below the boiler level, disconnect
DHW connections “10” and “12” in
Figure 3-1.

14.12 – Overrides

To carry out specifi c checks covered
in the manual, it is possible to override
the control logic of the boiler. See the
following sections:

14.12.1 - Auto-purging

To reset the auto-purging procedure

press the

and

keys

together for 10 seconds. When the

blinking

appears on the display,

press

14.12.2 - Fan

To run just the fan at full speed press

the

and

keys together

for 10 seconds, until the blinking

appears on the display. The fan

will run at full speed for 10 minutes. To
shut the fan off before the 10 minutes

is up press the

key.

14.12.3 – Minimum and
maximum output

The boiler can be run at its minimum
or maximum output in both the
heating and domestic hot water
modes by following the steps below:

1. generate a demand for the mode to

be overridden:

- for heating turn up the room

thermostat and turn knob “7” in
Figure 13-1 to its maximum;

- for domestic hot water turn

knob “11” in Figure 13-1 to its
maximum and fully open a hot
water faucet;

2. press the

and

keys

together for more than 10 seconds,

until a blinking

appears on

the display;

3. press the

key until the

display shows:

for minimum heating

output;

for maximum heating

output adjusted by P parameter,
see section 12.10;

for maximum heating

output;

for minimum DHW output;

for maximum DHW output;

4. press the

key in order to

restore the boiler to normal running
conditions.

14.12.4 – Checking the
fl ame current

While running at the minimum and
maximum output described in Section
14.12.3, the display will show the
letter of the mode checked. In the
second part of the display the value
of the ionization current will be
shown. 30 corresponds to a current
of 1 uA, 99 to a current of 5.5 uA.
The fl ame current must always be at
the correspondent value as shown
in Section 15, header “ionisation
current”. If the value is not within the
above values, check:
a - positioning of the fl ame sensor

electrod as per section 14.4;

b - CO2 content as per section 12.9;
c - combustion air pressure as per

section 12.8.