Overview of Primary Product

DIP switch 1 selects either system
controlled or panel controlled purge,
at the end of a heating or cooling
cycle.
DIP switch 2 selects either 2.0 or 3.5
minute panel controlled purge time
at the end of a heating or cooling
cycle.
DIP switch 3 inhibits stage 2 heat/cool
and stage 3 heat, when fewer than
1/2 of the total zones are calling.
DIP switch 4 inhibits (YES) stage 2 & 3
heating calls when the outdoor
o
temperature is above 50 or 60 F.
Requires optional Outdoor
Temperature Sensor.
DIP switch 5 selects an outdoor
o
temperature of 50 or 60 F for the
moderate weather limit setpoint.
Set the switch to the SYS position
allows system controlled purge cycle.
Set the switch to the 2.0 position
selects 2-minute purge cycle.
Set the switch to the (YES,ON) position
to limit stage 2 & 3 calls.
Set the switch to the YES position to
limit stage 2 & 3 heating.
o
Set the switch to ON to select 50 F.
o
Set the switch to OFF to select 60 F.
Set the switch to the PNL position
allows panel controlled purge cycle.
Set the switch to the 3.5 position
selects 3.5-minute purge cycle.
Set the switch to the (NO,OFF) position
to allow stage 2 & 3 calls, with any
number of zones calling.
Set the switch to the NO position to
allow stage 2 & 3 heating calls at any
outdoor temperature.
System or Panel
Purge Control
2 or 3.5 Minute
Panel Purge
Time
Limits Stage2 & 3
by Number of
Zones Calling
Limits Stage2 & 3
Heating Calls
In Moderate
Weather
Moderate
Weather
Temperature
Setting
ON
ONON ONON
ONON
ON
ON
ON
ONON
ON
ON
1
66 77
23
4
5
1
23
4
5
PNL
OFF
OFF
OFF
OFF
3.5
NO
NO
60
60
NO
NO
3.5
PNL
SYS
ON
ON
ON
ON
AUXRLYB
AUXRLYB
AUXRLYA
AUXRLYA
ONON
67
OFF
OFF
ON
ON
AUXRLYB
AUXRLYA
2.0
YES
YES
50
50
YES
YES
2.0
SYS
Selecting the Auxillary Relay Function
Selecting
Humidifier
Control
Combustion
Damper
Control
Fresh Air
Control
DIP switch 6 and 7 selects one of the following functions of
the Auxillary Relay. The Auxillary Relay can be set to control
a combustion air damper, fresh air damper or a
humidifier.
When the Auxillary Relay is selected to
control a humidifier (DIP switch 6 and
7 OFF), the panel monitors either a
humidistat or a humidity sensor with a
0 to 5VDC output.
When using a humidistat, the
humidifier will be activated (only
during a heating call) when the
humidity drops below the humidistat
setpoint. The humidifier will run a
minimum of 10 minutes or until the
heating call is satisfied. After the
minimum 10 minute run time, the
panel again checks the humidistat
and will turn the humidifier off when
ever the humidistat is satisfied.
If the Auxillary Relay is selected to
control a combustion air damper the
Auxillary Relay will be activated
whenever there is a heating call.
If the Auxillary Relay is selected to
control a fresh air damper, it will
activate the Auxillary Relay and the
indoor fan for the number of minutes
per hour set on the FRESH AIR
potentiometer. Because this
potentiometer is used for both fresh
air and humidity, use the numbers in
yellow for setting the minutes of fresh
air per hour required.
The panel will attempt to satisfy the
number of fresh air minutes per hour
during heating or cooling calls, to
minimize the effect of unconditioned
air flowing into the occupied space. If
it cannot satisfy the minutes of fresh
air during heating or cooling calls, it
will open the fresh air damper and
activate the indoor fan at the end of
the hour, for the time remaining.
When using a humidity sensor, the
humidifier will be activated (only
during a heating call) when the
humidity drops below the setpoint on
the HUMIDIFIER potentiometer. After
a 10-minute minimum operating
time, the panel checks to see if the
humidity level has risen above the
humidity setpoint. If not, the humidifier
will continue to run until the setpoint is
reached, or the call for heat is
satisfied.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [e-mail]
3
When using an
RH sensor
be sure to cut
the jumper wire.
0
25
35
16
45
55
32
HUMIDIFIER
FA MIN/HR
0
25
35
16
45
55
32
HUMIDIFIER
FA MIN/HR
DIP SWITCH BANK “B”