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ELECTRICAL & CONTROLS
F.
BOILER SAFETY INTERLOCKS
1. High Water Temperature Limit Switch: This boiler has
a maximum operating temperature of 210°F. If the
boiler water temperature reaches 210°F, the high
temperature limit will interrupt the heating cycle and
begin a post-purge. After the temperature drops 10°F,
the switch will automatically reset and allow the boiler
to reinitiate.
2. High Vent Temperature Limit Switch: The vent system
for this boiler has a maximum temperature limit of
210°F. If the exhaust vent temperature reaches or
exceeds 210°F (120°C), the limit will interrupt the
heating cycle and initiate a post-purge. The limit will
not reset until the red button under the burner hood is
pressed.
G. BOILER TEMPERATURE CONTROL
OPTIONS
The Pinnacle Oil boiler is offered with the POC #1
control board as standard. This boiler may be ordered
with the POC #2 or POC#3 control upgrades. The
features of each of these are as follows:
1. POC #1 Control: This control is factory set for on/off
operation. It can be easily programmed to provide
outdoor reset with reset override (requires Outdoor
Sensor #54034). This control can be used with an
external zone control that controls a DHW circulator
for DHW priority. It will provide a fixed setpoint water
temperature on a call for DHW.
2. POC #2 Control: This control offers the same
features of POC #1 with the added benefit of a DHW
circulator relay to provide full domestic hot water
priority without relying on an external zone control.
3. POC #3 Control: This control offers the same
features of POC #2 while allowing a second boiler
with a POC #1 control to be added to provide a
second stage of heating. If the first boiler does not
meet the demand in a reasonable time, the second
boiler will be started.
H. CONTROL MODES
The POC control allows 6 modes of operation.
1. Mode 1: This is designed to operate the boiler at a
fixed set point for systems which use parallel piping.
Once a heat demand signal is present, the control
operates the boiler to maintain a fixed temperature at
the boiler outlet. This is the default control mode and
requires no additional sensors.
2. Mode 2: This is designed to operate the boiler at a
fixed set point for systems using primary/secondary
piping. Once a heat demand is present, the control
operates the boiler to maintain a fixed temperature at
the system supply. This mode requires an additional
system supply sensor (54033).
3. Mode 3: This is designed to operate a parallel-piped
boiler with outdoor reset when a heat demand signal
is introduced. This requires an outdoor sensor
(54034). A setpoint demand (such as domestic hot
24
water) will override (reset override) the heat demand
and change the target temperature to the setpoint
value. For full DHW priority, control of the system and
DHW circulators is required. This can be
accomplished using the POC #2 or POC#3 control
from PB Heat. This can also be accomplished using
an external zone relay as shown later in this section.
4. Mode 4: This is designed to operate a primary/
secondary-piped boiler with outdoor reset when a
heat demand signal is introduced. This requires an
outdoor sensor (54034) in addition to a system supply
sensor (54033). A setpoint demand (such as domestic
hot water) will override (reset override) the heat
demand and change the target temperature to the
setpoint value. For full DHW priority, control of the
system and DHW circulators is required. This can be
accomplished using the POC #2 or POC#3 control
from PB Heat. This can also be accomplished using
an external zone relay as shown later in this section.
5. Mode 5: Mode 5 is designed for external boiler
control for multiple boiler installations. In this case, the
POC #1 control is used to provide boiler circulator
control only. The staging and sequencing is controlled
by the external control. This can be used in a two
boiler system to provide 2-stage operation as we will
show later in this section.
I.
USER INTERFACE
1. The POC controls offer status display of the boiler
circulator, burner, and heat or DHW demand.
2. It also displays the boiler supply temperature (°F or
°C) as standard while allowing the user to scroll
through 6 other temperature displays as well as a
display of the overall run time on the boiler.
3. The three push buttons on the face of the POC
Controls are labeled "Item", " " and " " are used
for selecting and adjusting settings.
4. Menus: All of the selectable items displayed by the
control are organized into two menus designated
VIEW
ADJUST
and
menus are accessible by switching the
Installer/Advanced dip switch located behind the lower
control cover.
a)
VIEW
This is the default menu for all three POC
controls and is displayed in the Menu Field above
the Number Field when accessing the View menu.
Table 6.1 shows the View Menu for the POC
controls.
-
The first column shows the item field with the
default values (where applicable) for the
control.
-
The next two columns show the access level at
which these items are available.
-
The fourth column shows the description of
the item field and if the item is only available
in certain control modes, the modes in which it
is shown are listed.
-
The fifth column shows the range of values
that may be displayed on this screen.
. Advanced options in both
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Troubleshooting
