Program menu - continued – Greenheck Microprocessor Controller v3.0 (469690) User Manual
Page 20
20
Unoccupied mode
setup.
Type:Cycle Supply Fan
Source: Input ID6
Allow the dampers to
open for:10 seconds
before starting the
fans.
Time delay between
heating, cooling, &/or
economizer modes.
Delay:600s
T
HIS
SCREEN
ALLOWS
FOR
THE
USER
TO
ADJUST
THE
DELAY
TIME
BETWEEN
MODES
.
This time delay prevents short-cycling between heating, cooling and/or economizer
modes.
T
HIS
SCREEN
DISPLAYS
WHAT
THE
UNIT
WILL
DO
IN
U
NOCCUPIED
MODE
.
Setting the Type to Cycle Supply Fan will engage the unit to maintain space
temperature. However, the room suppy temp sensor must be wired between B4 and
BC4 on the controller. If desired, the Source offers three options that can be used to
operate unoccupied/occupied modes:
Option 1: Input ID6 – typically used with a remote time clock (Default)
Option 2: BMS – can be overridden by a separate input to ID6
Option 3: Internal Time Clock – can be overridden by a separate input to ID6
Without the room supply temp sensor, the Type will say Unit Off, and thus the unit will
be off during unoccupied mode.
T
HIS
SCREEN
ALLOWS
FOR
THE
USER
TO
PROGRAM
THE
TIME
FOR
THE
DAMPERS
TO
OPEN
PRIOR
TO
THE
FAN
ENGAGING
.
This allows for a smoother startup of the system and prevents the fans from having
to overcome the higher pressures when dampers are just beginning to open. Since
dampers have a slow reaction time, the default is 10 seconds which allows enough time
for them to fully open.
Fan/airflow proving
alarm delay:030s
(inputs ID1 & ID5)
T
HIS
SCREEN
ALLOWS
FOR
THE
USER
TO
DELAY
AN
ALARM
SIGNAL
FROM
THE
FAN
AIRFLOW
PROVING
SWITCH
WHICH
SHUTS
THE
UNIT
DOWN
.
Since the unit is only part of a complete system, the airflows may momentarily change
(ie. If a downstream damper closes). This delay is intended to prevent false alarms (the
factory recommends that at least 30 seconds be programmed into the controller).
Time delay between
starting of supply
& exhaust fans.
Fan delay:005s
Also, the exhaust fan engages first, allowing the wheel to see space temperature
conditions prior to the supply fan engaging. This allows the energy recovery wheel
the opportunity to provide maximum preconditioning of the outdoor air. This also
minimizes the potential of extreme outdoor air temperatures being supplied to the
space prior to the cooling and or heating sections engaging.
PROGRAM MENU - continued
T
HE
TIME
DELAY
BETWEEN
THE
STARTING
OF
THE
SUPPLY
AND
EXHAUST
FANS
THAT
REDUCES
THE
STARTUP
AMP
DRAW
OF
THE
UNIT
.