Replacing The Back-Up Batteries - Robertshaw 9720 User Manual

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Changing dip switch settings:
1. Use a small screwdriver or pencil to move the switch to the desired setting.
2. Press RESET button. See Figure 5. Pressing RESET will erase any previously
entered programming information.
NOTE: When changing the settings on "Switch 1" , the RESET button does not have
to be pressed for the new configuration to register or operate.
IMPORTANT: New dip switch settings for "Switch 2" will not register or operate
options until the RESET button is pressed.

REPLACING THE BACK-UP BATTERIES

This thermostat is 24V AC powered and requires connection to both sides of
transformer for proper operation. It also requires four charged "AA" ENERGIZER
brand batteries or equivalent alkaline batteries as a back-up power source should
the 24V AC circuit be interrupted temporarily due to a power outage. The battery
back-up will maintain all program information during power outages.
This thermostat has two levels of low battery indication. As the back-up batteries
weaken, the thermostat will go to the next stage of low battery indication.
Low Battery—Stage 1
"LO BATT" stays constant on the display. Replace batteries soon. Display and
thermostat functions normal.
Low Battery—Stage 2
"LO BATT" stays constant on the display and thermostat "beeps" about once a
minute. Replace batteries immediately. Display and thermostat functions normal.
OPERATION
TCH 1
-
-
®
MON
F
PM
M A N U A L
+ - +
+ - +
RESET
Figure 5
LO
BATT HEAT