4
ATH15-501.0 (
Supplement to ATH15-500.10
)
Gas Heating Option Gas Pressure Setup
The Gas Heating Option requires gas pressure be measured
and adjusted as required at several points on the unit. The
instructions below must be followed and completed after
all other steps have been completed through page 22 of
Installation and Service Manual, literature #ATH15-500.10:
Carel Controller Settings
Setup of the gas heating option for units with furnace model
number digit 11= 6, 9, A, B, C, OR D requires certain settings be
entered in the main unit Carel controller to enable firing furnaces
individually or together for testing. Refer to the following
instructions when necessary (refer to the Controls Manual that
shipped with the unit for further information):
1. From the home screen press the “Prg” button (center
left button) to reach “Main Menu”. Refer to Figure 4.1 for
location of buttons.
9.
Use the arrow buttons to find “Analog Outputs” with the title
“Furnace 1 Signal” on the next line below. Press "Enter".
10. The cursor should go to the line “Manual Y4”. Use the
arrow buttons to set the value to “On” and press "Enter".
11. The cursor should now be in the “Manual Value” line. Press
the down arrow button once to set the values to 10.0vDC
for high fire. Values between 10.0vDC and 2.0vDC can be
used to check modulation, if desired. If the unit is operating
and this value is set to 1.5vDC or lower, the burners will
turn off. If the unit is not operating, this value must be set
above 2.0vDC to fire.
12. Hit “Esc” to return to the “Manual Management” menu.
13. Use the arrow buttons to select “d.Relay Outputs” and
press "Enter".
14. If the unit fan is running skip to step 15. Otherwise use the
arrow buttons to find “Relay Output” with the label “Supply
Fan” and press "Enter".
15. Use the arrow buttons to set the “Manual Relay 08” to
“Yes”, press "Enter" and then use the arrow buttons again
to set “Manual Position” to "Yes". At this point the supply air
fan should start. Press "Esc".
16. To operate the modulated furnace section use the arrows
buttons to find “Relay Output” with the label “Furnace 1
Ignition” to start the modulated furnace and press "Enter".
17. Use the arrow buttons to set the “Manual Relay 09” to
“Yes”, press "Enter" and then use the arrow buttons again
to set “Manual Position” to Yes. At this point, furnace 1
should initiate a start sequence even without pressing
"Enter". Changing “Manual Position” to “Yes” or “No” at this
point can be used to initiate and end furnace 1 operation
as desired. Once furnace 1 is fired, you can begin to
program the main valve and modulating valve high and low
settings as needed. You can also press “Esc” and go back
to “e.Analog Outputs” shown in steps 8-11 above to test
various demand points. When you have completed setting
and testing furnace 1, set manual position to "Off". The
furnaces will operate for 5 minutes in this condition before
the control resets “Manual Relay” to “No” and turns off the
furnace. If a longer run time is needed, reset the “Manual
Relay” and “Manual Position” to “Yes” to restart.
18.
Furnace Digit 11=9 or C Only (dual furnaces with a two
stage furnace section)
: For units with dual furnaces, the
“Relay Outputs” list will have one screen titled “Furnace
2 Stage 2” that controls high fire and “Furnace 2 Stage
1” that controls low fire. Each is controlled by setting the
“Manual Relay” and “Manual Position” to “Yes”, similar
to step 14 above. Note: Stage 1 “Manual Relay” and
“Manual Position” must be set to “Yes” for the furnace
to fire. The furnace will always fire on high input but will
step to low after thirty seconds of burner operation. To
operate at high fire continuously, “Furnace 2 Stage 2”,
“Manual Relay” and “Manual Position” must also be set to
“Yes". This is accomplished by setting “Furnace 2 Stage1",
“Manual Relay” and “Manual Position” to “Yes.” After
setting “Manual Position” to “Yes”, press "Enter" and you
will be able to navigate to “Furnace 2 Stage 2” using the
arrow buttons and again set “Manual Relay” and “Manual
Position” to “Yes”. The furnaces will operate for 5 minutes
at a time in this condition before the control resets “Manual
Relay” to “No” and turns off the furnace. If a longer run time
Figure 4.1 - Carel Controller Buttons and Screen
Prg Button
Esc Button
Enter Button
(between Up and
Down arrow buttons)
2. Arrow up or down to reach the “Service” menu and hit
"Enter" (center right button). Arrow up or down to “g.
Manual Management” and press "Enter".
3. At the password prompt use the arrow and "Enter" buttons
to enter the password 1500.
4.
If the unit is configured with a 2-position type damper (unit
model digit 7=D, E, or F) and the damper is closed, arrow
up to “d. Relay Outputs” and press "Enter". Use the arrow
keys to find “OA Damper Open” and press “Enter”. The
cursor should be on the “Manual Relay 05” line, set “Manual
Relay 05” to “Yes” and press “Enter”. The cursor should
now be on the “Manual Position” line. Set “Manual Position”
to “On” and press "Enter".
5. Arrow up to “e.Analog Outputs” and press "Enter". If the
main fan is operating, skip to step 8.
6.
If the fan is not running, use the arrow buttons to find
“Supply Fan” and press "Enter".
7. The cursor should be on the “Manual Y5:” line. Set “Manual
Y5:” to “On” and press "Enter".
8. The cursor should now be on the “Manual Value:” line. Set
the value to 10.0vDC for full speed fan operation and press
"Enter". Note that depending on unit configuration, the
maximum value delivered to the VFD may be displayed at
less than 10.0vDC. This is normal.
GAS HEAT START-UP PROCEDURE
