Greenheck Microprocessor Controller v3.0 (469690) - Manual (Page 7)

7
Access the SET POINTS menu through the Main Menu. Scroll through the menu screens using the keys.
***ACCESS DENIED***
Enter Password:0000
WRONG PASSWORD
Unit Set Points
Supply set pt
is currently=###.#ºF
This set pt is reset
up/down by the DDC.
Supply Air Reset
Outside Supply
060.0ºF --->
072.0ºF
070.0ºF ---> 060.0ºF
T
HIS SCREEN CAN BE LOCKED TO PREVENT TAMPERING WITH THE SETTINGS
.
F
ROM THE FACTORY
,
ACCESS IS NOT PASSWORD PROTECTED TO ALLOW QUICKER
START
-
UP
.
To set the password, go to the ‘PROGRAM’ menu by pressing the button. Once
there, scroll down until you arrive at the Change Password screen. The ‘Level 1’
password protects the ‘SET POINTS’ menu.
T HIS SCREEN DISPLAYS THE CURRENT DISCHARGE SET POINT FOR THE UNIT ,
WHICH IS THE TEMPERATURE THE UNIT IS TRYING TO DISCHARGE .
If there is no room temperature sensor (nothing wired to terminals B4 and BC4 on
controller), the controller changes the supply air discharge temperature of the unit
based on the outdoor air temperature (refer to outdoor air reset function below). With
no room temperature sensor, a BMS can override the controller and input directly the
desired supply temperature for the unit.
If a room temperature sensor is connected to terminals B4 and BC4 on the DDC
controller, then the supply temperature of the unit is adjusted based on the difference
between the actual room temperature (reading from the room temperature sensor) and
the desired room temperature which is programmed into the controller (refer to Room
Set Point screen below). With a room temperature sensor connected to the controller, a
BMS can override the controller and input directly the desired room set point. This new
desired room set point will be used for comparing with the actual room temperature.
To activate the BMS override temperatures, refer to the Program Menu and change the
Set Point Source screen to BMS Interface.
T HESE PARAMETERS DICTATE THE OPERATION OF THE OUTDOOR AIR RESET
FUNCTION IN THE CONTROLLER
.
This screen does not appear when the room supply temp sensor is wired into
terminals B4 and BC4 on the controller.
The unit monitors the outdoor air temperature and adjusts the desired supply
temperature accordingly. For example, when the outdoor air is below 60.0ºF, the
controller will change the Supply set pt to 72.0ºF. If the outdoor air is above 70.0ºF, the
controller would change the Supply set pt to 60.0ºF. If the outdoor air temperature is
between 60.0ºF and 70.0ºF, the Supply discharge temperature changes according to
the outdoor air reset function. A visual representation of the outdoor air reset function
is shown.
Outdoor Air Reset Function
55°
57°
59°
61°
63°
65°
67°
69°
71°
73°
55° 60° 65° 70° 75°
Outside Air Temperature (°F)
D
isch
ar
g
e
T
e
m
p
er
at
u
re (
°F
)
Desired Supply Temperature
72.0°F
Desired Supply Temperature
60.0°F
SET POINTS MENU