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STARTUP
When power is first applied, an internal startup
prcgrom begins. This reauires 1 minute to complete.
and takes place after any total loss of power (supply
voltage and backup battery).
During this titie, default temperature set point values
exe used for temperature control. These CIIC: heating
68 F (20 C]. economizer 72 F (22 C), and cooling 78 F
(26 C]. Following the statiup period. you can enter
new set points which will @e ,used in place of these
default values.
Should a power failure occur after your time and
temperature schedule entries are made, the backup
battery will maintain your schedule. As long as either
system or battery backup power is present, your
program is available and will be used for’
temperature control.
>
i
,
OPERATION
IMPORTANT:
Note that the T7400 svstem will not read
instonton~usly to s&t point changes. Except os
mentioned below, the minimum stage on- and otf-
times will oIwoys be followed. Although the
temperature control monitoring occurs constantly,
the temperature display updates approximately
every 2 minutes unless the ROOM TEMPERATURE key is
depressed.
The temperature control program takes effect after
the startup period. If space temperature is far below
set point, CI stage of heat could turn on within 1
minute of startup. This is the only exception to the
heating minimum off-time of 2 minutes.
If mechanical cooling is called for. the minimum off-
time of 4 minutes will elapse after the 1 minute
startup period (5 minutes total).
Fig. 1 -Thermostat cycle timing illustrations
MINUTES
OPERATIONAL
1 COOLING 1 HEATING 1
I
xe temizerature = 70 F; heat 1
POWER-UP
MINUTES
I I
/I/
0 . Power on (1 st applied or after ioss of
supply voltage and backup
battery.
7
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