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G G e e n n e e r r a a l l I I n n f f o o r r m m a a t t i i o o n n
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The unit is set on the roof curb, and temporary heat
is provided in the building. Isolate all side panel
service entrances and base pan openings (e.g.,
conduit holes, S/A and R/ A openings, and flue
openings) from the ambient air until the unit is
ready for start-up.
N N o o t t e e : : Do not use the unit's heater for temporary heat
without first completing the start-up.
The manufacturer will not assume any responsibility
for equipment damage resulting from condensate
accumulation on the unit's electrical and/or mechanical
components.
Unit Description
Before shipment, each unit is leak tested, dehydrated,
charged with refrigerant and compressor oil, and run
tested for proper control operation.
Direct-drive, vertical discharge condenser fans are
provided with built-in thermal overload protection. The
stages of capacity control for these units are achieved
by starting the Economizer Control Actuator (ECA).
System Input Devices and Functions
The unit must have a thermostat input in order to
operate.
The descriptions of the following basic input devices
used within the unit are to acquaint the operator with
their function as they interface with the various
features. Refer to the unit's electrical schematic for the
specific device connections. The following controls are
available from the factory for field installation.
Drain Pan Condensate Overflow Switch
(Optional)
This input incorporates the Condensate Overflow
Switch (COF) mounted on the drain pan. When the
condensate level reaches the trip point, the COF relay
energizes and opens the 24 Vac control circuit,
disabling the unit. A delay timer prevents the unit from
starting for 7 minutes.
Phase Monitor
The Phase Monitor is a three-phase line monitor
module that protects against phase loss, phase
reversal, over voltage and under voltage. It is intended
to protect compressors from reverse rotation. It has an
operating input voltage range of 125–624Vac, and LED
indicators for ON and FAULT. There are field
adjustments and the module will automatically reset
from a fault condition.
Discharge Line Thermostat Control
The high pressure controls and the discharge line
thermostat signals are wired in series and connected to
8
the safety input of the LSD. The compressor contactor
coil is connected to the 'CC' terminal of the LSD. If the
high pressure control switch or the discharge line
thermostat is open, the 24 Vac signal to the SI input of
the LSD is interrupted and the compressor contactor
coil supply is disabled by the LSD. It has an automatic
lockout.
The high pressure controls and discharge line
thermostats are wired in the system protection
detection port. If the high pressure control switch or the
discharge line thermostat is open, the main control
board will turn off the compressor of the
corresponding system. There is no automatic lockout.
Evaporator Frost Control
This input incorporates the Evaporator Frost Control
mounted in the indoor coil and can be activated by
closing a field supplied contact installed in parallel with
the Frost Control.
If this circuit is open before the compressor is started,
the compressor will not be allowed to operate. Anytime
this circuit is opened for 5 continuous seconds during
compressor operation, the compressor for that circuit
is immediately turned "Off". The compressor will not
be allowed to restart for a minimum of 3 minutes
should the Frost Control close.
Sensors
High Temperature Sensor (BAYFRST003*)
This sensor connects to the Emergency Stop Input on
the LTB and provides high limit "shutdown" of the unit.
The sensor is used to detect high temperatures due to
fire in the air conditioning or ventilation ducts. The
sensor is designed to mount directly to the sheet metal
duct. Each kit contains two sensors. The return air duct
sensor (X1310004001) is set to open at 135°F.
The supply air duct sensor (X1310004002) is set to open
at 240°F. The control can be reset after the temperature
has been lowered approximately 25°F below the cutout
setpoint.
Thermostat (TCONT802AS32DA)
This thermostat is a multi-stage 3 heat/2 cool,
autochangeover digital display thermostat. It is a
programmable thermostat, and a 7-day programmable
stat with night setback shall be available. In addition, it
is wall mounted.
Thermostat (TCONT402AN32DA)
This thermostat is a multi-stage 3 heat/2 cool, auto
changeover digital display thermostat. It is a
nonprogrammable, wall-mounted thermostat, and it
can be used for economizer operation.
RT-SVX069A-EN
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