Evaporator Frost Control - Trane Axiom GWS Series Installation, Operation And Maintenance Manual

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
the lead compressor or refrigeration circuit switches.
When the RTRM is powered up, i.e. after a power
failure, the control will default to the number one
circuit compressor.

Evaporator Frost Control

This input incorporates the Frostat™ control (FOS)
mounted in the indoor coil and can be activated by
closing a field supplied contact installed in parallel with
the FOS.
If this circuit is closed before the compressor is started,
the compressor will not be allowed to operate. Anytime
this circuit is closed for 1 continuous second 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 FOS open.
Frostat™ is standard on multi-speed indoor motors and
single zone VAV products (SZVAV).
Smoke Detector Sensor (Optional)
This sensor is only applicable on units equipped with a
RTOM. It provides high limit "shutdown" of the unit
and requires a manual reset. The sensor is used to
detect smoke due to fire in the air conditioning or
ventilation ducts.
The supply and return air smoke detectors are
designed to shut off the unit if smoke is sensed in the
supply air stream or return air stream. This function is
performed by sampling the airflow entering the unit at
the return air opening. Follow the instructions provided
below to assure that the airflow through the unit is
sufficient for adequate sampling. Failure to follow
these instructions will prevent the smoke detectors
from performing it's design function.
I I m m p p o o r r t t a a n n t t : : Airflow through the unit is affected by the
amount of dirt and debris accumulated on
the indoor coil and filters. To insure that
airflow through the unit is adequate for
proper sampling by the return air smoke
detector, complete adherence to the
maintenance procedures, including
recommended intervals between filter
changes, and coil cleaning is required.
Periodic checks and maintenance procedures must be
performed on the smoke detector to insure that it will
function properly. For detailed instructions concerning
these checks and procedures, refer to the appropriate
section(s) of the smoke detector Installation and
Maintenance Instructions provided with the literature
package for this unit.
In order for the supply air smoke detector or return air
smoke detector to properly sense smoke in the supply
air stream or return air stream, the air velocity entering
the smoke detector unit must be between 500 and 4000
feet per minute. Equipment covered in this manual will
develop an airflow velocity that falls within these limits
12
over the entire airflow range specified in the
evaporator fan performance tables.
Zone Sensors
N N o o t t e e : : Zone sensor required for units configured for
Single Zone VAV indoor fan system control to
enable Single Zone VAV functionality.
Zone Sensor Module (ZSM)
(BAYSENS107*)
This electronic sensor features three system switch
settings (Heat, Cool, and Off) and two fan settings (On
and Auto). It is a manual changeover control with
single setpoint. (Cooling Setpoint Only)
Zone Sensor (BAYSENS109*)
This electronic sensor features four system switch
settings (Heat, Cool, Auto, and Off) and two fan settings
(On and Auto) with four system status LED's. It is a
manual or auto changeover control with dual setpoint
capability. It can be used with a remote zone
temperature sensor BAYSENS075*.
Programmable Zone Sensor
(BAYSENS119*)
Programmable Night Setback: Auto or manual
changeover with seven-day programming. Keyboard
selection of Heat, Cool, Fan, Auto, or On. All
programmable sensors have System On, Heat, Cool,
Service LED/indicators as standard. Night Setback
Sensors have one (1) Occupied, one (1) Un-occupied,
and one (1) Override program per day.
Remote Zone Sensor (BAYSENS073*)
This electronic sensor features remote zone sensing
and timed override with override cancellation. It is used
with a Trane Integrated Comfort™ building
management system.
Remote Zone Sensor (BAYSENS074*)
This electronic sensor features single setpoint
capability and timed override with override
cancellation. It is used with a Trane Integrated
Comfort™ building management system.
Remote Zone Sensor (BAYSENS016*)
This bullet type temperature sensor can be used for;
outside air (ambient) sensing, return air temperature
sensing, supply air temperature sensing, remote
temperature sensing (uncovered). Wiring procedures
vary according to the particular application and
equipment involved. Refer to the unit's wiring
diagrams for proper connections.
WSHP-SVX015C-EN