6
General Information
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 SER-
VICE signal is sent to the remote panel if the pressure differen-
tial across the filters is at least 0.5" w.c. The contacts will auto-
matically 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.
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 cir-
cuit 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 com-
pressor for that circuit is turned off immediately. The com-
pressor will not be allowed to restart for a minimum of 3
minutes.
If four consecutive open conditions occur during an active
call for cooling, the compressor will be locked out, a
diganostic communicated to ICS™, if applicable, and a
manual reset required to restart tyhe compressor. On dual
compressor units only the affected compressor circuit is
locked out.
Electromechanical Control
When the LPC is opened, the compressor for that circuit is
turned off immediately. The compressor will restart when the
LPC closes.
High Pressure Control (Optional — except on
R-410A units)
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.
If four consecutive open conditions occur during an active call
for cooling, the compressor will be locked out, a diganostic
communicated to ICS™, if applicable, and a manual reset
required to restart tyhe compressor. On dual compressor units
only the affected compressor circuit is locked out.
Electromechanical Control
When the HPC is opened, the compressor for that circuit is
turned off immediately. The compressor will restart when the
HPC closes.
Power Exhaust Control (Optional)
ReliaTel Control
The power exhaust fan is started whenever the position of
the economizer dampers meets or exceed the power ex-
haust setpoint when the indoor fan is on.
With the optional ventilation override accessory, the power
exhaust fan is independent of the indoor fan.
The setpoint panel is located in the return air section and is
factory set at 25%.
Electromechanical Control
The power exhaust fan is started whenever the indoor fan is
on and the adjustable damper limit switch DLS is closed.
Lead/Lag Control (Dual Circuit Only)
ReliaTel Control 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, 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.
Zone Sensor Module (ZSM) (BAYSENS006B)
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 Module (ZSM) (BAYSENS008B)
This electronic sensor features four system switch settings
(Heat, Cool, Auto, and Off) and two fan settings (On and
Auto). It is a manual or auto changeover control with dual
setpoint capability. It can be used with a remote zone tem-
perature sensor BAYSENS017B.
Zone Sensor (BAYSENS010B)
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
BAYSENS017B.
Wall Mounted Relative Humidity Sensor (BAYSENS036A)
Field installed, wall mounted humidity sensor is used to
control activation of the hot gas reheat dehumidification
option. Humidity set points can be selected for relative
humidity levels between 40% and 60% by adjusting the
DEHUMID setting on the ReliaTel Options Module. See
page 24.