Adjusting The Heating Capacity; Domestic Hot Water Fl Ow Rate Adjustment (160-C Model Only); Cold Start Boiler - Slant/Fin VSL-160B Installation Instructions Manual

12 - START-UP
Correspondent
"P" parameter
heat input
value
(btu/hr)
Table 12-1 - Correspondence table to set
space heating input
12.10 - Adjusting
the heating
capacity
This boiler has been engineered
with an "intelligent" micro-processor
control that will adjust the heating
output to match the system demand.
To maximize the effectiveness of
the system, the parameters
found in the "Installer's menu", in
Section 13.17, can be adjusted set
the maximum heating output to the
effective maximum load necessary
for the system. The
can be adjusted from 100 (factory
set value), to 1. The correspondence
between value and heating output
is given by table in Figure 12-1.
NOTE: This setting, adjusts the
heating input only. The domestic
output is always 160,000 btu/hr for
every value.
68
12.11 - Domestic
hot water fl ow rate
adjustment (160-C
model only)
The volume of domestic hot water
that the boiler can produce, depends
on the fl ow rate of the domestic water
system. If the fl ow rate is too high,
the water will move through the heat
exchanger without being adequately
heated. It is therefore advisable to
carry out the following adjustments:
1. switch the on/off power switch, item
"12" in fi gure 13-1, to "on";
parameter
2. adjust control "11" as shown in
Figure 13-1, to 130 °F (50 °C);
3. fully open a hot water faucet. If a
mixing type faucet with single lever
is opened, the position must be
fully to HOT;
4. set the domestic hot water mixing
valve (fi eld installed), to its
maximum value);
5. wait 5 minutes for the temperature
to stabilize;
6. if the water temperature is too
low, reduce the water fl ow using a
fl ow restrictor (Field installed) until
reaching the desired temperature
(turn the fl ow restrictor in small
increments and wait for the
temperature to stabilize to prevent
overshooting the desired value).
NOTE: Water fl ow should generally
be regulated according to the
values given in Section 15, under
the heading "instantaneous d.h.w.
production [rise 75 °F (42 °C)]".
12.12 - Cold start
boiler
The boiler has a "cold start" working
mode. Any time the room thermostat
opens (no call for heat), the burner
stops immediately. However even with
the room thermostat contact open, the
boiler will run for freeze protection as
described in Section 13.14.