18-CD32D1-3
31
Installer’s Guide
The information to be displayed on the user interface
during Unit Test mode is:
•
On start of the Unit Test sequence, the words "UNIT
TEST" will appear on the first line.
•
"Y1 ON FAN ON" will appear on the second line dur
-
ing the first test.
• When the unit lights in first stage heating, "STAGE 1"
will appear on the second line.
•
When the unit transitions to second stage, "STAGE 2"
will appear on the second line.
•
When the unit transitions to the heat off delay, the
user interface will return to the standby screen. If
Unit Test mode operation is terminated for any reason,
the user interface will return to the standby screen.
STAND ALONE OPERATION (CONTINGENCY MODE)
The Contingency Mode allows the installer to set the
equipment to operate in an ON/ OFF Duty Cycle mode.
This mode will be activated using the User Interface. The
user will select the desired level of capacity required, Stage
1 or 2. The user will select the desired ON/ OFF Duty Cycle,
10% minimum to 50% maximum, (10% increments, 10%
= 2 minutes On, 18 minutes Off; 50% = 10 minutes on, 10
minutes off).
CONTINGENCY MODE
•
Stand alone operation can only be entered at the
user interface.
•
Stand alone operation can be set up to operate the
furnace in
Heating Only.
•
The contingency mode is used when the communi-
cating comfort Control is not communicating with
the furnace or when setting gas pressures.
•
Before attempting to enter contingency mode,
disconnect the Data wire D from the Furnace IFC
terminal block.
•
The contingency mode will function only when the
Furnace IFC is not flashing a fault code at its Fault
LED.
•
To enter the contingency mode of operation, cycle the
120 VAC power supply off and then back on.
•
Scroll down using the down arrow
at the User
Interface until you see
CNTNGNCY Mode
, then
press the
Enter
button.
•
CNTNGNCY MODE
and
STAGE
will now
be displayed. Press the
Enter
button.
•
STAGE
and
OFF [OFF]
will now be displayed. A
F i r s t o r S e c o n d S t a g e o f h e a t
m u s t
b e
selected. Use the
or
arrows to select the stage
of heat wanted and then push the
Enter
button
and then the
button.
•
DUTY CYCLE
and
10% [10%]
will now be displayed.
A duty cycle
must
now be selected from 10 to 50%. A
10% duty cycle will run the furnace for 2 minutes and
then off for 18 minutes. A 50% duty cycle will run the
furnace for 10 minutes and then be off for 10 minutes.
These duty cycles will be repeated 3 times per hour.
Use the
or
arrows to select a duty cycle and then
push the
Enter
button and then the
button.
•
Start
and
NO
[NO]
will now be displayed. With a
NO/NO
question being asked, use the
or
arrows to select the
YES
and then press the
ENTER
button.
•
Are you Sure and NO [NO]
will now be displayed.
With a
NO/ NO
question being asked, use the
or
arrows to select the
YES
and then press the
ENTER
button.
•
Turn 120 VAC power off. When the Green LED on
the variable speed inducer drive goes out, turn
120 VAC power back on.
•
When the furnace is operating in the contingency
mode (stand alone operating cycle), the user
interface will display the following information. The
top line will say
CNTNGNCY MODE
. The bottom
line will show the operating stage number
STG
(
1 or 2)
selected, and the percent number
10-50
%
selected.
•
All furnace operating controls, pressure switches and
communications between the IFC and the variable speed
indoor blower will be functional during continuous mode
operation of the furnace.
•
The
and
ENTER
buttons do not function
in the contingency mode of operation.
•
To exit the contingency mode of operation turn off the
120 VAC power to the furnace.
•
The contingency mode (stand alone operation) will
stop for any of the following reasons:
(1)
If the furnace IFC receives a signal from the
communicating comfort control. This will only
happen if the data wire D from the comfort
control has been reconnected to the furnace
IFC terminal board terminal D.
(2)
Power is removed from the furnace and then
turned back on.
Note: If a communicating comfort control is detected to be
present and the contingency mode menu is selected, “NOT
AVAILABLE” will be displayed on the user interface.
(3)
The Furnace IFC enters a
RESET
mode of
operation.
(4)
A fault is detected by the furnace IFC. Fault
L E D w i l l b e f l a s h i n g a n A l e r t C o d e .
24V CONTINGENCY MODE
An alternative method for the contingency mode can be used
by changing the mode of operation in the user interface to 24v
mode and installing a conventional 24v comfort control.
To set this mode of operation:
Remove all wiring from the *CONT900 comfort control and
install a 24v comfort control. If the comfort control requires a
24v common; connect R and B to respective terminals. Connect
3rd wire to "W". At the control board, connect the same 3
wires to the corresponding terminals. Jumper W1 to W2 at
the control board. The stage delay between W1 & W2 can be
set by scrolling thru the user interface. It is factory set at zero
minutes but can be adjusted to 5, 10, or 15 minutes.
