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nviManOverride = "HVO_OFF,0.000,0."
nviEnergyHoldOff = "0.00 0."
If they are other than as shown above, temporarily set the variables for normal operating condition
before further checking the EL unit.
B. Damper blade position estimated visibly from views shown below:
C. Use the information from steps 1 and 2 on the previous page to determine if the damper blades are correct
for the conditions.
•
Determine mode. The EL unit should be in cooling if the supply air temperature (1.B. previous page) is
below the set point (2.A. previous page). It is heating if the supply air temperature is above both the
room temperature and the set point.
•
For room temperatures (1.A. previous page) more than 2ºF/1.2ºC from set point (2.A. previous page),
damper blades should be as shown in the table below.
Notes:
Room temperature more than ±2ºF/1.2ºC from set point has been selected as a general rule of thumb
for trouble shooting to avoid more complicated control algorithms within that band. Control is intended
to be tighter but will depend on system conditions.
If any of the set points are changed to achieve full open or full closed conditions, wait 5 to 10 minutes
to make sure the room and system have stabilized.
For room temperatures less than 2ºF/1.2ºC from setpoint, the damper blades may be somewhere
between open and closed.
MODE
Cooling
Heating
D.
If the damper blades are not according to the table, check for any overrides limiting opening or closing?
See step 2.A. on the previous page.
E.
If there are no limiting flow
stops or overrides, measure
the voltage supplied to the
heater. Remove the controller
cover and measure the voltage
across the terminals marked
heat. See sketch of controller.
If the voltage is not according
to the above table, complete
step 3 "EL Electrical" before
contacting Acutherm.
ROOM TEMP minus
SET POINT
+2 F/1.2 C
- 2 F/1.2 C
+2 F/1.2 C
- 2 F/1.2 C
DAMPER BLADE
POSITION (sec 2.B.)
Open
Closed
Closed
Open
VOLTAGE TO THE
HEATER (sec 2.E.)
> 25VDC
< 1VDC
< 1VDC
> 25VDC
9
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