14
DC SOl Connection
The two pin DC SOL connector provides a
connection to the Copeland UltraTech second
stage compressor solenoid. This solenoid is
internal to the compressor. This 24VDC solenoid
will not operate properly if 24VAC is applied to
the compressor solenoid terminals.
To reduce the VA load of the solenoid on the
system, Comfort Alert uses a phase control
method to reduce the DC voltage to the solenoid
to the minimum level required to keep the
solenoid pulled in. As the 24VAC supply voltage
varies, Comfort Alert intelligently changes the
solenoid DC voltage supply to minimize power
consumption. A voltmeter attached to the DC SOL
output will measure 4-18VDC, when solenoid
should be energized, depending on the level of
the 24 VAC supply.
Interpreting The Diagnostic lEDs
When an abnormal system condition occurs, the
Comfort Alert module displays the appropriate
ALERT and/or TRIP LED. The yellow ALERT LED
will flash a number of times consecutively, pause
and then repeat the process. To identify a Flash
Code number, count the number of consecutive
flashes. Every time the module powers up, the
last ALERT Flash Code that occurred prior to
shut down is displayed for one minute.
Installation Verification
To verify the installation of Comfort Alert is
correct, two functional tests can be performed.
Disconnect power from the compressor and force
a thermostat call for cooling. The red Trip LED
should turn on indicating a compressor trip as
long as 24VAC is measured at the Y terminal.
If the red LED does not function as described,
refer to figure 9a to verify the wiring.
Disconnect power from the compressor and
24VAC from Comfort Alert. Remove the wire from
the Y terminal of Comfort Alert, reapply 24VAC
power to Comfort Alert and reconnect power
to the compressor. Force a thermostat call for
cooling and when the compressor starts to run
the yellow Alert LED will begin flashing a Code
8 indicating a Welded Contactor. Disconnect
power from the compressor and 24VAC from
Comfort Alert. While Comfort Alert is off, reattach
the wire to the Y terminal. Reapply power to
compressor and 24VAC to Comfort Alert, the
yellow Alert LED will flash the previous code 8
for 1 minute and then turn off. If the yellow LED
does not function as described, refer to Figure
9a to verify the wiring.
Troubleshooting The Installation
Depending on the system configuration, some
ALERT Flash codes may not be active. The
presence of safety switches affects how the
system alerts are displayed by this module.
low Voltage Connections
Room Thermostat — Several options are
available for a room thermostat depending on
the accessories installed with the unit. Select a
thermostat which operates in conjunction with
the installed accessories. The thermostat should
be mounted about five feet above the ground on
an inside wall. The thermostat should be kept
away from drafts, slamming doors, lamps, direct
sunlight, or in line with the supply air flow.
To install the thermostat:
1. Position the sub base on an inside wall and
mark the mounting holes and thermostat
cable openings.
2. Cut out the cable opening and route the
thermostat cable from the unit’s low voltage
compartment to the thermostat location.
The thermostat cable is supplied by the
installer.
3. Connect the cable leads to the sub base or
thermostat terminals and to the unit’s low
voltage terminal block as shown in figure
8. A system wiring diagram is also provided
on the inside of the control panel cover.
4. Secure sub base or thermostat to the
wall using screws provided with the
thermostat.
5. If sub base is used, install the correct
thermostat housing to sub base.
6. Refer to thermostat instruction sheet for
complete detailed mounting information.
Demand Defrost Control — The demand defrost
board controls the defrost cycle in response to
ambient temperature, outdoor coil temperature
and accumulated compressor run time. The heat
pump is allowed to operate in the heating mode
until the combination of outdoor ambient and
outdoor coil temperatures indicate that defrosting
is necessary, based on the programmed defrost
curve. There are three preprogrammed defrost
curves on the board. A jumper pin is used to switch
between the different curves. The factory default
setting is program two. This is the recommended
setting for most standard applications.
The standard defrost cycle will terminate after
13 minutes and 39 seconds or when the coil
temperature reaches its terminate temperature,
whichever comes first.
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