Block
AUX
FLOW input to verify the operation of the A/C units. The dip switch setting on the PSA-1 are set to alternate the air
temperature limit sensor input. If the contacts are open, indicating that the room temperature is above 80 degrees, the
contacts)
In the case of a dual failure of both A/C units, the PSA-1 can be configured to turn on both units at the same time. It is
operating the lead A/C, the PSA-1 will use the lag A/C to cool the room.
PSA-1 will turn off the lead A/C and turn on the lag A/C. Only the lag A/C will be used in the system until A/C 1 is repaired
FLOW
AC 1
Configuration
CONTROL input. The normally closed contacts of a high temperature limit sensor is set to 80 degrees and is wired to the
ON/OFF
What happens if an A/C fails?
conditioners every 5 days. The alarm time delay is set to 30 seconds.
Example 2: Wiring the PSA-1 for use in dual A/C systems
(normally open
and the PSA-1 alarm is cleared. If while the lag A/C is on and the contacts of the high temperature limit sensor opens,
What happens if both A/C fail?
condition is cleared.
T1 Power Connections
Room
The PSA-1 starts the lead A/C when the room thermostat contacts close (the temperature of the room raises above 72
degrees) and will remain on until the room thermostat contact open (temperature falls below 72 degrees). After 5 days of
The PSA-1 alternates operation between the two air conditioners to maintain an equipment room at 72 degrees. When the
Example 2
24VAC
INPUT
possible that the load that the A/C's are seeing are too high to cool the room. With both A/C units on it may over come this
T1
White
LOAD 2 LOAD 1
BLK
conditioner is repaired and the PSA-1 alarm is cleared by pressing the ALARM OFF push-button.
Red
High Temperature
A/C Control Voltage or
Connect black wire to line hot fused
indicating that the lag A/C has failed to cool the room, the lag A/C will also be turned off and no longer used until the alarm
A/C 1 is the lead A/C, and A/C2 is the lag A/C. A room thermostat is set 72 degrees and is wired to the ON/OFF
PSA-1 will turn off the lead A/C and turn on the lag A/C. The lead A/C will no longer be used in the system until the air
Room temperature raises above 72 degrees and the lead A/C is started. After 30 seconds the PSA-1 looks at the high
Limit Sensor
AC 2
CONTROL
PSA-1 Terminal
(normally open contacts)
temperature drops below 72, the contacts of the room thermostat closes and the PSA-1 starts A/C 1.
On/Off control signal
Connect white wire to line neutral
OUTPUT ALARM
Room temperature raises above 72 degrees the lead A/C is started. After 30 seconds the PSA-1 looks at the high
Thermostat
temperature limit sensor input. If the contacts are open, indicating that the room temperature is above 80 degrees, the
AUX
load.
Normal Operation
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Esta version es la html del arhivo pdf pump_sequencer_manual, genearada por domotica.name desde www.temperatureguard.com
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