Unit Start-Up
34
RT-SVX46C-EN
Light Commercial applications, supply air
temperature should not be set below 50°F.
Zone Temperature Control without a Night
Setback Panel or ICS - Unoccupied Cooling
When a field supplied occupied/unoccupied switching
device is connected between RTRM J6-11 and RTRM J6-12,
both the economizer and the mechanical cooling will be
disabled.
Zone Temperature Control without a Night
Setback Panel or ICS - Unoccupied Heating
When a field supplied occupied/unoccupied switching
device is connected between RTRM J6-11 and J6-12 and
DWU is enabled, the zone temperature will be controlled at
10°F below the Morning Warm-up setpoint, but not less
than 50°F, by cycling one or two stages of either gas or
electric heat, whichever is applicable.
Morning Warm-up (MWU) Control
Note:
Heating control only used on Multi-Zone VAV
applications.
Morning warm-up is activated if the zone temperature is at
least 1.5°F below the MWU setpoint whenever the system
switches from unoccupied to occupied status. The MWU
setpoint may be set from the unit mounted potentiometer
or a remotely mounted potentiometer. The setpoint
ranges are from 50°F to 90°F. When the zone temperature
meets or exceeds the MWU setpoint, the unit will switch to
the “Cooling” mode. The economizer will be held closed
during the morning warm-up cycle.
Daytime Warm-up (DWU) Control
Note:
Heating control only used on Multi-Zone VAV
applications.
Daytime warm-up is applicable during occupied status
and when the zone temperature is below the initiation
temperature. It can be activated or deactivated through
ICS or a night setback zone sensor. If ICS or a night setback
zone sensor is not utilized, DWU can be activated by
setting the DWU enable DIP switch (RTAM) to ON and
supplying a valid morning warm-up setpoint.
The unit is shipped with a morning warm-up setpoint
configured and the daytime warm-up function is activated
(switch on). Opening the DWU enable switch will disable
this function.
If the system control is local, the DWU initiation setpoint is
3°F below the morning warm-up setpoint.The termination
setpoint is equal to the morning warm-up setpoint.
If the system control is remote (Tracer™), the DWU
setpoint is equal to theTracer™ occupied heating setpoint.
The initiation and termination setpoints are selectable
setpoints designated by Tracer™.
When the zone temperature meets or exceeds the
termination setpoint while the unit is in an occupied,
“Auto” mode or switched to the “Cooling” mode, the unit
will revert to the cooling operation.
If an occupied “Heating” mode is selected, the unit will
only function within the DWU perimeters until the system
is switched from the “Heat” mode or enters an unoccupied
status.
Return Air Smoke Detector
The return air smoke detector is designed to shut off the
unit if smoke is sensed in the return air stream. Sampling
the airflow entering the unit at the return air opening
performs this function.
In order for the smoke detector to properly sense smoke in
the return air stream, the air velocity entering the unit must
be in accordance with manufacturers recommended
airflow limits.
Economizer Start-Up
Minimum Position Setting
ReliaTel™ Control:
Momentarily jump across theTest 1 &Test 2 terminals
on LTB1 one additional time if continuing from
previous component start-up or until the desired start-
up component test is started.
1. Verify that the dampers stroked to the full open
position.
2. To stop the SERVICE TEST, turn the main power
disconnect switch to the “Off” position or proceed to
the next component start-up procedure. Remove
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.
WARNING
Rotating Components!
During installation, testing, servicing and
troubleshooting of this product it may be necessary to
work with live and exposed rotating components. Have
a qualified or licensed service individual who has been
properly trained in handling exposed rotating
components, perform these tasks. Failure to follow all
safety precautions could result in rotating components
cutting and slashing technician which could result in
death or serious injury.
