The Honeywell 5821 is a wireless temperature sensor and water sensor. The 5821 wireless transmitter can either be used as a standalone temperature sensor or it can be used in combination with the T280R temperature sensor probe or a water/flood probe. The 470PB or FP280 can be hardwired to the 5821 and configured for flood detection. The 5821 ships with a 2.2M ohm resistor to be strapped in parallel with a 470PB. On the other hand, the FP280 comes with a 16.5 foot cable that already has the resistor wired into the circuit. Honeywell created the FP280 to make it easier for end users or DIYers to setup flood detection. The 5821's dip switch settings along with the programmed loop number of its wireless zone will determine which type of protection the 5821 wireless transmitter will be providing.
Without any probe the internal temperature sensor of the wireless Honeywell 5821 can be used to monitor the protected room's temperature. As a standalone temperature sensor, the 5821 can monitor for cold, warm or hot temperatures.
Program your 5821 wireless sensor as loop 1 with both dip switches off for cold temperature monitoring and the sensor will fault when the temperature drops below 45° F for more than (10) minutes.
Program the 5821 as loop 2 with both dip switches off for hot temperature monitoring and the transmitter will fault when the temperature rises above 95° F for greater than (10) minutes.
Program the Honeywell 5821 as loop 2 with SW1 dip switch on and SW2 dip switch off for warm temperature monitoring and the temperature sensor will fault when the temperature rises above 75° F for more than 10 minutes.
If you wire the T280R temperature probe to your 5821 wireless temperature sensor, you can use it for remote freezer temperature monitoring or refrigerator temperature monitoring.
Program the Honeywell 5821 as loop 2 with dip switch SW1 off and SW2 dip switch on for freezer temperature monitoring. When the T280R temperature probe detects temperatures above 10° F for more than (30) minutes, The 5821 will trigger an alarm.
Program the 5821 sensor as loop 2 with both dip switched on for refrigerator temperature monitoring. When the T280R temperature sensor detects temperatures above 42° for more than (30) minutes, the 5821 will trigger an alarm.
If you wire the 470PB water probe to your 5821 wireless water sensor, you can use it for water leak protection.
Program the Honeywell 5821 as loop 3 with dip switch SW1 off and SW2 dip switch on for flood monitoring. When the 470PB water probe detects water for more than (3) minutes, The 5821 will trigger an alarm.
The Honeywell 5821 is an extremely versatile wireless environmental sensor. Not only can it do local cold, warm or hot temperature sensing or remote freezer, refrigerator or flood sensing, it can even do local cold temperature monitoring simultaneously with local warm or hot temperature monitoring or local cold simultaneously with a remote temperature or water probe.
Program the 5821 wireless sensor as (2) separate wireless zones with cold as loop 1 and the other type of protection as loop 2. The dip switches should be set to match the other type of protection for proper detection. The 5821 will trigger an alarm when either event occurs.