Economizer
Relevant Set Points
1. MAT SET The mixed air temperature set point
after the energy wheel. The control will modulate
the energy wheel to maintain temperature as best
as it can. (Set point menu, default 53°F )
2. LOW T LOCK The set point for the low
temperature mechanical cooling lockout. (Set point
menu, default 32°F)
3. DRYBLB SET The outdoor air set point to call for
economizer. (Set point menu, default 63°F)
4. MIN POS The minimum signal voltage sent to the
energy wheel. This must be set to 2 VDC. (Set point
menu, default 2.8 VDC)
5. AUX1 O The controllers operating sequence
structure. (Set point menu, default ‘None’)
6. ERV OAT SP The set point for low temperature
economizer lockout. This is the low temperature set
point when AUX1 O is set to ERV. (Set point menu,
default 32°F)
7. STG3 DLY Time delay after second cooling stage
is enabled (Advanced setup menu, default 2 hrs.)
Using the Keypad with Settings and
Parameters
To use the keypad when working with Set points,
System and Advanced Settings, Checkout tests, and
Alarms:
1. Navigate to the desired menu.
2. Press (enter) to display the first item in the
currently displayed menu.
3. Use the and buttons to scroll to the desired
parameter.
4. Press (enter) to display the value of the currently
displayed item.
5. Press the button to increase (change) the
displayed parameter value.*
6. Press the button to increase (change) the
displayed parameter value.*
7. Press (enter) to accept the displayed value and
store it in non-volatile RAM.
8. CHANGE STORED displays.
9. Press (enter) to return the current menu
parameter.
10. Press (escape) to return to the current menu
parameter.
* When values are displayed, pressing and holding
the or button causes the display to
automatically increment.
MODULATE WHEEL
STOP WHEEL
OA
Temp
OA
Enthalpy
OA/RA
Temp
Differential
OA
Temp
OA
Enthalpy
OA/RA
Temp
Differential
DRYBLB SET
X
X
MAT SET
X
X
X
X
X
X
LOW T LOCK
X
X
X
X
X
X
ERV OAT SP
X
X
X
MIN POS
X
X
X
AUX1 OUT
ERV
ERV
ERV
STG3 DLY
X
X
X
X
X
X
Stop Wheel
1. Navigate to the Checkout menu and press
enter).
2. The energy wheel and cooling should stop.
3. Navigate to Connect ERV and press (enter) twice
to run the test.
4. Voltage between AUX1-O and C should be 24 VAC.
The energy wheel should activate.
Modulate Wheel
1. Navigate to the Checkout menu and press
Enter).
2. The cooling should turn off and the wheel should
be rotating at full speed.
3. Navigate to Damper Open and press (enter) twice
to run the test.
4. Voltage between terminals ACT 2-10 and ACT
COM should be 10 VDC. This will slow the wheel
down to minimum speed.
5. Press (escape), navigate to Damper Close and
press (enter) twice to run the test.
6. Voltage between terminal ACT 2-10 and ACT COM
should be 2 VDC. This will speed the wheel up to
maximum speed.
The table shows which set points are relevant to the
given sequences. Refer to the wiring diagram for the
units’s sequence.
Energy Recovery Ventilator
17
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