10
DIGICOM / DIGIHP THERMOSTATS
DESCRIPTION
The Zonex Systems
DIGICOM
and
DIGIHP
are
microprocessor based, auto changeover, stand-
The
DIGICOM
and
DIGIHP
are very easy to configure through the
system program or to make manual adjustments using the buttons located
on the front cover.
These thermostats feature an onboard thermistor for precise tempera-
ture measurement. In the event of power loss, the Heat and Cool set-
points are stored in a non-volatile memory, without the need for bat-
tery backup.
The space ambient temperature is continually displayed with large,
Programmed setpoints can be manually adjusted at the thermostat or
electronically locked through the system program to provide limited
manual setpoint adjustment. Two-hour override is provided for
after-hours temporary operation with a touch of a button.
INSTALLATION
Thermostat and terminal base
1. The thermostat is to be installed on an interior wall, away from drafts,
supply air currents and direct sunlight or any heat generating source.
2. To remove the thermostat cover, grasp the cover at the top and pull
straight off; do not pivot the cover from the base.
3. Install the thermostat terminal base to the wall using the provided
anchors and screws. The thermostat can also be mounted on a 2x4
electrical box using two #6-32” screws.
Wiring
The Zonex Systems
DIGICOM
and
DIGIHP
thermostats have been
specifically designed to make wall mounting and wire connections very
easy. The thermostat terminal base has two separate terminal blocks: the
left side terminal block is for the 24vac control circuits, and the right
side terminal block is for the RX TX communication circuits. There are
two sets of RX TX terminals on the base to make daisy chain wiring from
device to device straightforward and simple.
1. Use minimum 18-gauge AWG thermostat wire for the 24vac control
circuits. The load on these circuits must not exceed 1 amp. The voltage
range on R and C must not exceed 28vac.
2. Connect the communication wires to the RX TX terminals. There are
2 sets of RX TX terminals for “daisy chain” installation of this circuit.
The communication wire specification is twisted pair (Belden 8740)
or shielded twisted pair wire (Belden 8450).
NOTE: When using shielded twisted pair wire (Belden 8450), just
connect the shield conductors together, as there is no electrical
connection on the thermostat base terminals. The shield will be landed
on the Command Center on the G or TR2 terminal.
Fig. 1
DIGICOM
DIGIHP
Fig. 2
H
V
A
C
U
N
I
T
SPDT, 24V
AC Relay
C
G
R
R
G
W1
4
2
5
1
3
Fig. 3
Blower Fan Relay
For electrical heat applications, which require a fan output on a call for
heat. (See
Fig 3.
)
with no dampers in the system. The
DIGICOM
is
the Gas Electric version and has two-stage heat /
cool outputs with selectable fan operation. The
DIGIHP
Heat Pump thermostats have two-stage
cool and three-stage heat outputs with selectable
fan. The
DIGICOM
and
DIGIHP
thermostats have a large, easy-to-read
LCD display with a distinctive gray backlight. The display backlight is
continuously illuminated in the Occupied mode and goes off in the Un-
alone thermostats used to control stand-alone units
occupied mode.
easy-to-read numbers. The DIGICOM temperature display range is
Fan mode, Heat or Cool setpoints and operation modes are all indicated
on the display.
57°to 90°F., and the DIGIHP temperature display range is 57°to 90°F.
