Electric Heat; Holiday Mode; Remote Temperature Sensor; Keypad Lock - Carrier 33CS Installation, Start-Up, And Operating Instructions Manual

Electric Heat —
When the Electric Heat option in the ad-
vanced set up is set to ON (configured by installer), the thermo-
stat will turn on the fan immediately any time there is a heat
demand. This feature should only be used on first stage electric
heating applications. Do not use with gas heat.
Holiday Mode —
When the thermostat is in Holiday
mode, the thermostat will operate under Unoccupied set points.
To configure and activate the Holiday mode, press the Holiday
button. The ''HOL'' icon will be displayed along with the re-
maining days of Holiday mode operation. Press the UP or
DOWN ARROWS to select the number of days that the holi-
day schedule will be in effect. A value of 0 disables Holiday
mode. The duration can be set from 1 to 99 days. The thermo-
stat will enter Holiday mode on midnight of the next day after
the mode has been activated. Holiday mode will remain in
effect until midnight of the last configured day.
→
If the Holiday mode is in effect, the number of days remain-
ing and the "HOL'' icon will be displayed. The Override button
will be active during Holiday mode. The Dry Contact Switch is
ignored.
To turn off the Holiday mode before the remaining config-
ured days have passed, press the Holiday button to enter into
the configuration mode. Press the DOWN ARROW to set the
number of days to zero. Holiday mode will be disabled.
Remote Temperature Sensor —
ture sensor is available to read the temperature from a space. If
a remote temperature sensor is connected, the thermostat will
ignore the reading of its internal sensor. When the thermostat is
using a reading from a remote sensor, the degree symbol above
the temperature reading will blink.
Keypad Lock —
To prevent unauthorized use of the ther-
mostat, the front panel buttons can be disabled. To disable or
lock the keypad, press and hold the Mode button. While hold-
ing down the Mode button, press the UP and DOWN ARROW
buttons simultaneously. The ''Locked'' icon will appear on the
display.
The thermostat is unlocked by performing the same proce-
dure. Press and hold the Mode button. While holding down the
Mode button, press the UP and DOWN ARROW buttons
simultaneously. The ''Locked'' icon will be removed from the
display.
→
Dry Contact Switch/External Control —
tact switch is provided to allow an external device to force the
thermostat into Occupied 1 mode. When the thermostat is
forced into Occupied 1 mode via the dry contact closure, the
Occupied 1 icon will blink each second. The external device is
wired to contacts CK1 and CK2. See Fig. 8.
NOTE: Twenty-four volt power is not required for CK1 and
CK2.
When using the auxiliary input or controlling multiple
HVAC units with a single thermostat, it is possible to encounter
transformer phasing problems that will interfere with thermo-
stat operation.
result in a direct short, which could damage transformers and/
or the thermostat. Phasing problems are likely if the units share
a common ground with secondary grounded transformers.
gether. If phasing is impractical, isolation relays may be used to
isolate the transformers. To isolate the auxiliary input, use a
separate transformer for the auxiliary control device (usually a
timeclock). Connect the device to an isolation relay coil. Con-
nect one set of isolated contacts to each thermostat at CK1 and
A remote tempera-
CK2.
HVAC units with one thermostat, phase the HVAC units or use
isolation relays to isolate the unit transformers. One unit will be
connected directly to the thermostat and the unit will power the
thermostat. All other units will require one set of isolated con-
tacts for each of the following: Heat, Cool, Fan, and Reversing
Valve (if required).
24 VAC power transformer in common. This requires identify-
ing which terminals from the high voltage input lugs are pro-
viding power to the transformer. Do not assume that the same
terminals will always provide power to the transformer. For
each unit, check the unit wiring diagram. See Fig. 9.
SOFT START — When multiple thermostats are controlled
by the same external device, a Soft Start option can be used to
stagger the turn on times of the HVAC equipment. This feature
may cause a delay in operation after entering Unoccupied
A dry con-
mode.
10-Watt Resistor —
vided with the thermostat. This resistor should only be used in
applications where it is necessary to use 4 wires in a power-
stealing mode when the common wire (C) is not available. It is
recommended that a common wire be used whenever possible.
Refer to the Troubleshooting section for more information on
resistor use and wiring.
7
Connecting transformers that are not phased correctly may
Determining proper phasing can be difficult without the
help of an electrician (especially across different building
transformers). Damage to equipment can result if phasing
is improperly done. The use of isolation relays is recom-
mended before attempting phasing.
Do not attempt to rewire equipment internally to phase
units. Damage to unit components may occur.
To avoid this problem, if possible, phase all HVAC units to-
To prevent phasing problems when controlling multiple
Units that are phased will have the high voltage legs to the
A 10-watt, 270-ohm resistor is pro-
1204