Filter
Top Products
MODBUS The RS485 Network and Hardware Setup • 6-11
The Comfort Alert diagnostic alarms are configurable
in the E2 as Disabled, Failure, Alarm, or Notice with an
accompanying priority setting. All Comfort Alert codes
will share the same advisory type and priority parameters.
High/Low Occ/Unocc Space Temperature Alarms
The thermostat does not provide alarming information
on either high or
low temperatures for the Space tempera-
ture sensor. Therefore, the E2 application will provide this
fu
nctionality.
Supply Sensor Fail Alarm
The thermostat does not provide alarm information on
a failure of the
supply temperature probe (if installed). The
E2 application will provide this functionality. Advisory
type, priority, and delay is provided for the supply sensor
fail advisory.
Conditions for Return to Normal (RTN) on Diag-
nostic Codes
The E2 application will issue an RTN on an active
advi
sory when the corresponding bit of the diagnostic
code goes to zero. If multiple diagnostic advisories are
active simultaneously, they will all return to normal when
the code reads zero.
6.3.10 Refrigerant Leak Detection
System (RLDS)
The RLDS provides for the continuous monitoring of
refrigerant gas levels in up to 16 separate test zones or
channels. The instrument is programmed to monitor a
variety of gases and independent leak (small), spill
(medium), and evacuation (large) levels may be desig-
nated for each zone. The instrume
nt also retains a log of
previous readings that can be accessed for analysis.
Figure 6-9
- RLDS
The RLDS has alarm level configuration parameters
that are synchronized. These will be read first from the
device. The E2 will be master of all other parameters. An
audible alarm and front panel indicators are provided to
signal alarm and fault conditions, and relay contacts are
provided that can be used to trigger external alarm devices
in the event of a system fault, or if a leak (small), spill
(medium), or evacuation (large) level of gas is detected.
The system also may be fitted with an optional two-chan-
nel 4-20mA current loop board for connection to remote
m
onitoring equipment.
Welded Contactor Compressor always runs. • Compressor contactor has failed closed
• Thermostat demand signal is not connected
to module.
Welded Contactor
Low Voltage Control circuit < 17VAC. • Control circuit transformer is
overloaded
• Low line voltage (contac
t utility if voltage
at disconnect is low)
Compressor Low Volt Trip
Protector
Trip Thermostat demand signal Y is
present, but the compressor is
not running.
• Compressor protector is open.
• Outdoor unit power disconnect is open.
• Compressor circuit breaker or fuse(s) is
open.
• Broken wire or connector is not making
contact.
• High pressure switch open if present in
system.
• Compressor contactor has failed open.
Protector Trip
Comfort Alert Descriptions Cause E2 Advisory
Table 6-6
-Comfort Alert Outputs