Greenheck Microprocessor Controller (474706 IOM) TAP v1.04 June 2011 (ERCH, ERH, APEX, VER, ERT) - Manual (Page 12)

12 DDC Controller for Tempered Air Products
A. On/Off Unit
B. Setpoint
The controller is equipped with several menus to help guide users with altering program parameters. The
following menus can be accessed by pressing the
Prg Esc
key. To enter the desired menu, press the
Prg Esc
key.
The On/Off Unit menu allows the user to view the detailed On/Off status of the
controller.
The unit ships from the factory in a disabled state. To allow the unit to operate,
the controller must receive a run command from digital input ID4. Jumper unit
terminals R - G to allow the unit to operate.
Actual State: The controller may be in following On/Off states:
a. Unit On - Unit is ON, functioning normally.
b. Off by ALARM - Unit is OFF due to an alarm. View alarms by pressing
ALARM button.
c. Off by PLAN - Unit is OFF by pLAN network.
d. Off by BMS - Unit is OFF by BMS command
e. Off by SCHEDULER - Unit is OFF by internal Clock/Scheduler.
f. Off by DIGITAL INPUT(ID4) - Unit is OFF by digital input 4 (ID4).
g. Off by KEYPAD - Unit is commanded OFF by this screen.
Change to (Switch Off/Switch On): Enables user manually turn unit On/Off via
display. Unit terminal G must have 24 VAC power to enable the unit.
T
his screen allows The user To adjusT which sysTem conTrols The uniT
o
n
/o
ff sTaTe
.
Digital Input: Default to YES. Unit terminal G must have 24 VAC power to
enable the unit.
The user can also use the BMS or internal time clock to command the unit
On/Off state. If scheduling is desired, go to the Clock/Scheduler menu to set
a schedule.
BMS: YES allows BMS to control unit On/Off state.
Scheduler: YES allows internal scheduler (time clock) for unit On/Off control.
The Setpoint menu allows the user to view and adjust temperature related
parameters.
T
his screen displays The currenT supply air seT poinT
.
This screen does not appear if a BMS is directly setting the supply air set point.
This screen displays the current supply air set point, determined by the
controller. The supply set point is reset either by outdoor air temperature, or
room temperature if installed. The user may also directly control the supply air
set point. To activate the BMS set point capability, go to the Set Point Source
screen in this menu.
If a room temperature sensor is connected to the controller, the supply air
temperature is reset to achieve the room temperature set point. The “local”
room temperature set point can be set via the controller (see Room Set Point
screen). Otherwise, the BMS can directly input the desired room set point. To
activate the BMS set point capability, go to the Set Point Source screen in this
menu.
T his screen displays The room seT poinT .
This screen only appears if a room sensor is wired into controller terminals B4 and
BC4.
The unit will reset the supply air temperature to maintain the local set point. If
a BMS is interfaced with the controller, the user has the capability to directly
input the desired Room Set Point though the BMS. The screen will show
a BMS set point and an Active set point. The active set point is the room
temperature the controller is currently trying to maintain.
Menus
On/Off Unit
Actual state:
Off by DIG INPUT (ID4)
Change to: SWITCH ON
*Power ID4 to start…
Unit ON/OFF Control
Enable unit OnOff
By digit input: Yes
By BMS: No
By Scheduler: Yes
Supply Set Point
is currently = 60°F
This set pt is reset up/down
by the DDC
Room Set Point
Local set pt: 72.0°F
BMS set pt: 70.0°F
Active set pt: 70.0°F
®