Johnson Controls RL Series User Manual

RL SERIES INSTALLATION MANUAL
Freeze Detection (AI-5)
The freeze detection sensor will monitor the liquid refrigerant
temperature entering the water coil in the heating mode. If the
temperature drops below the freeze detection trip point for the
recognition delay period, the condition will be recognized as a fault.
The freeze detectopm trip point will be factory set for 30°F and will
be field selectable for 15°F by removing a jumper wire on BI-5.
The freeze detection fault condition will be bypassed 2 minutes
at normal compressor startup, to allow the refrigeration circuit to
stabilize. If the freeze detection sensor becomes unreliable at any
time compressor operation will immediately be suspended until the
problem is corrected. This should be displayed as an alarm on the
BAS and the MUI. This alarm will be reported a “Water Low Temp
Limit” fault.
High Pressure (BI-11)
The high-pressure switch shall be a normally closed (NC) switch
that monitors the systems refrigerant pressure. If the input senses
the high-pressure switch is open it must disable the compressor
output immediately and count the fault. The compressor minimum
on time does not apply if the high-pressure switch opens. The
compressor will not restart until the compressor short cycle time
delay has been satisfied.
Low Pressure (BI-3)
The low-pressure switch shall be a normally closed (NC) switch
that monitors the systems refrigerant pressure. The input shall be
checked 15 seconds before compressor start up to be sure the
pressure switch is closed and then ignored for the first 2 minutes
after the compressor output (BO-2) is enabled. If the switch is
open continuously for (30) seconds during compressor operation
the compressor output (BO-2) will be disabled. The compressor
will not restart until the compressor short cycle time delay has
been satisfied.
Alarm Output (BO-6)
The alarm output will be enabled when the control is in the lockout
mode and will be disabled when the lockout is reset.
Test Mode
Raising the zone temperature input (AI-1) reading to 180 – 220
degrees F or by holding the ESC and down arrow keys on the MUI
for 5 seconds will put the control into test mode. In test mode the
random start delay and the compressor fixed on delay time will
both be shortened to 5 seconds and the reversing valve will be
allowed to cycle with out shutting down the compressor. If an MUI
is connected to the control LED 8 will flash and the words “Test
Mode Enabled” will be shown on the LCD display when the control
is in test mode. Test mode will be disabled after a power cycle, 30
minute timeout, or by holding the ESC and Up arrow keys on the
MUI.
Power Fail Restart
When the controller is first powered up, the outputs will be
disabled for a random start delay. The delay is provided to prevent
simultaneous starting of multiple heat pumps. Once the timer
expires, the controller will operate normally.
Random Start Delay
This delay will be used after every power failure, as well as
the first time the compressor is started after the control exits
the unoccupied mode or the emergency shutdown mode. The
delay should not be less than 1 second and not longer than 120
seconds. If the control is in test mode the random start delay will
be shortened to 5 seconds.
Compressor Fixed On Delay Time
The Compressor Fixed On Delay Time will ensure that the
compressor output (B02) is not enabled for (90) seconds after
the control receives a call to start the compressor. This delay is
adjustable from 30 – 300 seconds over a BAS or a MUI. If the
control is in test mode the Compressor Fixed On Delay Timer will
be shortened to 5 seconds.
Compressor Minimum On Delay
The compressor minimum on delay will ensure that the
compressor output is enabled for a minimum of (2) minute each
time the compressor output is enabled. This will apply in every
instance except in the event the high pressure switch is tripped or
emergency shutdown then the compressor output will be disable
immediately.
Compressor Short Cycle Delay Time
The compressor short cycle time delay will ensure that the
compressor output will not be enabled for a minimum of (5)
minutes after it is disabled. This allows for the system refrigerant
pressures to equalize after the compressor is disabled.
Heating Cycle
On a call for heating, the blower enable output and accessory
output 2 will turn on immediately after the random start delay timer
has been satisfied. If the compressor short cycle time delay has
been satisfied, the compressor will turn on after the blower enable
and accessory output 2 are on and the fixed compressor start
delay timers have been satisfied.
Set Point Control Mode
In set point control mode the reversing valve output will
be disabled. As the temperature drops below the heating
set point and begins to operate in the heating proportional
band, the low capacity compressor output (BO-2) will be
enabled. A PID loop in the programming of the control will
determine when the full capacity compressor output (BO-4)
is to be enabled. The compressor must be operating in low
capacity for a minimum of 30 seconds before the full capacity
Optional FX10 Microprocessor Control cont.
JOHNSON CONTROLS
30

Johnson Controls RL Series Specifications

General

Brand	Johnson Controls
Model	RL Series
Category	Heat Pump
Language	English