20
Go to
SETUP > INSTALL
.
Configuration ID 2,
position
5
will need to be set to either
2
or
3
depending whether A42
is wired on DI-2 or DI-3.
Using parameter 115 is only applicable if Safety switch A42 is enabled via
Configuration ID 2
.
Go to
SETTINGS > RTU OPTION > EDIT PARAMETER = 116 (MAX PHASE MON OCC)
3.3.5.
Air Flow Proving Switch (S52 - Optional)
The air flow switch closes during normal unit operation. If air flow is not established (S52 closed)
within 16 seconds of
blower start or if the S52 opens at any time after
that, the M3 unit controller de-energizes the compressor, gas valves,
electric heat, and closes economizer damper. The service alarm output will turn on.
Go to
SETUP > INSTALL. Configuration ID 2
, position
1
and set to
C
to enabled the air flow proving switch
monitoring via the M3 Unit controller.
If S52 is physically connected to DDC controller,
Configuration ID 2
position
1
is set to
D
. The M3 unit controller
will not monitor S52 using this configuration.
3.3.6.
Dirty Filter Switch (S27- Optional)
The dirty filter switch is open during normal unit operation. A dirty filter will close S27 and the M3 unit controller will display
and store the error code and turn on the service alarm output (if configured).
Go to
SETUP > INSTALL
.
Configuration ID 2
, position
2
will need to be set to
C.
This will enable the dirty filter switch
when installed.
3.3.7.
Blower Overload Relay Switch (S42 - Optional)
S42 is a three-phase thermal overload relay. This switch is connected in line with the blower motor to monitor the current
flow to the motor. When the relay senses current that exceeds the operating limits of the motor, a set of normally closed
contacts open to de-energize the blower.
Go to
SETUP > INSTALL. Configuration ID 2
, position
4
has to be set to either
2
or
3
to enable the blower overlay
relay switch if installed.
NOTE
: The N setting option will disable S42 monitoring of 2 (DI-2) or 3 (DI-3).
3.3.8.
Overflow Switches (S149 / S179 - Optional)
The N.C. overflow switch or switches are connected to the M3 unit controller (A55) in series (when applicable) through
either D1-2 or DI3. When the switch opens, the unit controller will de-energize the compressor. After a fiveminute time
out, the unit controller will verify the overflow switch position and restart the compressor(s) as long as a cooling demand is
present (if the switch has closed).
Go to
SETUP > INSTALL. Configuration ID 2,
position
3
has to be set to either
2
or
3
to enable the overflow switch
if installed.
NOTE
: Overflow switch alarms will not indicate an OFF ON ALARM state (see table 61).
3.3.9.
Blower On-Delay
For electric heat units, the Blower On-Delay is disabled and is not adjustable.
For gas units, the blower is delayed 40 seconds (default) which is set using parameter 66, after the gas valve is
energized. Adjustable range is 8 to 60 seconds.
Go to
SETTINGS > RTU OPTION > EDIT PARAMETER = 66 (HT GAS BLR ON DELAY)
For gas units (Energence Standard Efficiency 3 to 6-ton units), the blower on is delayed 20 seconds (default) after the
gas valve is energized. This value is fixed and cannot be changed.
For cooling units, the blower is delayed zero seconds (default) which is set using parameter 79. Adjustable range is 0
to 60 seconds.
Go to
SETTINGS > RTU OPTION > EDIT PARAMETER = 79 (COOL BLR ON DELAY)
On Energence Ultra High Efficiency 3- to 6-ton models blower on-delay is disable and not adjustable.
3.3.10.
Blower Off-Delay
For electric heat units, the blower off is delayed 20 seconds (default) from the time the heating call is terminated. The
blower delay is adjustable using parameter 60. Parameter range setting is 0 to 300 seconds. Go to
SETTINGS > RTU
OPTION > EDIT PARAMETER = 60 (HT ELEC BL OFF DLAY)
For gas units, the blower off is delayed 120 seconds (default) from the time the heating call is terminated. The blower
delay is adjustable using parameter 67. Parameter range setting is 80 to 300 seconds. Go to
SETTINGS > RTU
OPTION > EDIT PARAMETER = 67 (HT GAS BLR OFF DLAY)
