WSHP-SVX015C-EN
11
The descriptions of the following basic Input Devices
used within the RTRM network are to acquaint the
operator with their function as they interface with the
various modules. Refer to the unit’s electrical
schematics for the specific module connections.
N
No
otte
e:: The following controls are available from the
factory for field installation.
Supply Fan Failure Input (Optional)
The Fan Failure Switch can be connected to sense
indoor fan operation:
FFS (Fan Failure Switch) If air flow through the unit is
not proven by the differential pressure switch
connected to the RTOM (factory set point 0.07 “ w.c.)
within 40 seconds nominally, the RTRM will shut off all
mechanical operations, lock the system out, send a
diagnostic to ICS, and the SERVICE output will flash.
The system will remain locked out until a reset is
initiated either manually or through ICS.
Drain Pan Condensate Overflow Switch
(Optional)
This input incorporates the Condensate Overflow
Switch (COF) mounted on the drain pan and the
ReliaTel
™
Options Module (RTOM). When the
condensate level reaches the trip point for 6 continuous
seconds, the RTOM will shut down all unit function
until the overflow condition has cleared. The unit will
return to normal operation after 6 continuous seconds
with the COF in a non-tripped condition. If the
condensate level causes the unit to shutdown more
than 2 times in a 3 day period, the unit will be locked-
out of operation. A manual reset of the diagnostic
system through the Zone Sensor or Building
Automation System (BAS) will be required. Cycling unit
power will also clear the fault."
Clogged Filter Switch (Optional)
The unit mounted clogged filter switch monitors the
pressure differential across the return air filters. It is
mounted in the filter section and is connected to the
RTOM. A diagnostic SERVICE signal is sent to the
remote panel if the pressure differential across the
filters is at least 0.5" w.c. The contacts will
automatically open when the pressure differential
across the filters decreases to approximately 0.4" w.c.
The clogged filter output is energized when the supply
fan is operating and the clogged filter switch has been
closed for at least 2 minutes. The system will continue
to operate regardless of the status of the filter switch.
Please note that on units equipped with factory
installed MERV 13 filters, a clogged filter switch with
different pressure settings will be installed. This switch
will close when the differential pressure is
approximately 0.8' w.c. and open when the differential
falls to 0.7" w.c.
Compressor Disable (CPR1/2)
This input incorporates the low pressure control (LPC)
of each refrigeration circuit and can be activated by
opening a field supplied contact installed on the LTB.
If this circuit is open before the compressor is started,
the compressor will not be allowed to operate. Anytime
this circuit is opened 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 contacts close.
If four consecutive open conditions occur during the
first three minutes of operation, the compressor for
that circuit will be locked out, a diagnostic
communicated to the remote panel (if installed), and a
manual reset will be required to restart the
compressor.
Low Pressure Control
ReliaTel
™
™
Control
When the LPC is opened for 1 continuous second, the
compressor for that circuit is turned off immediately.
The compressor will not be allowed to restart for a
minimum of 3 minutes.
If four consecutive open conditions occur during the
first three minutes of operation, the compressor will be
locked out, a diagnostic communicated to ICS™ if
applicable, and a manual reset will be required to
restart the compressor.
High Pressure Control
ReliaTel
™
™
Control
The high pressure controls are wired in series between
the compressor outputs on the RTRM and the
compressor contactor coils. If the high pressure control
switch opens, the RTRM senses a lack of current while
calling for cooling and locks the compressor out.
On dual circuit units, if the high pressure control opens,
the compressor on the affected circuit is locked out. A
manual reset for the affected circuit is required.
Power Exhaust Control (Optional)
The power exhaust fan is started whenever the position
of the economizer dampers meets or exceed the power
exhaust setpoint when the indoor fan is on.
The setpoint panel is located in the return air section
and is factory set at 25%.
Lead/Lag Control (Dual Circuit Only)
Lead/Lag is a selectable input located on the RTRM.
The RTRM is configured from the factory with the Lead/
Lag control disabled. To activate the Lead/Lag function,
simply cut the wire connected to J3-8 at the RTRM.
When it is activated, each time the designated lead
compressor is shut off due to the load being satisfied,
Содержание Axiom GWS Series
Страница 75: ...WSHP SVX015C EN 75 N No ot te es s...
