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C4H5S, H4H5S, T4H5S: Installation Instructions
Time Delays
The unit time delays include:
• Five minute time delay to start cooling or heating operation when
there is a call from the thermostat. (To bypass this feature in a
non-communicating system, momentarily short and release forced
defrost pins.
• Five minute compressor recycle delay on return from a brown out
condition
• Two minute time delay to return to standby operation from last valid
communications (with Ion™ Communicating Control only)
• One minute time delay of outdoor fan at termination of cooling mode
when outdoor ambient is greater than or equal to 100°F (37.78°C).
• Fifteen second delay at termination of defrost before the auxiliary heat
(W2) is de-energized.
• Twenty second delay at termination of defrost before the outdoor fan
is energized.
• Seventy and sixty second compressor delays when Quiet Shift-2
enabled.
Utility Interface With Non-Communicating Thermostats
Utility curtailment will work when the unit is operating with a
non-communicating thermostat and the utility interface. It will also work
with the Ion™ Communicating Control without the need for the utility
interface.
When
the
utility
curtailment
non-communicating thermostat, the utility relay should be wired
between R & Y.
Low Ambient Cooling
When this unit is required to operate below 55°F (12.78°C) to a
minimum of 0°F (-17.78°C) outdoor temperature, provisions must be
made for low ambient operation.
Low ambient applications require the installation of accessory kits:
• Low Ambient Pressure Switch Kit
• Evaporator Freeze Thermostat
• Hard Start kit
• Crankcase Heater
• Field Supplied Isolation Relay
Support feet are recommended for low ambient cooling. See Product
Specification sheet for kit part numbers on appropriate unit size and
series unit.
For low ambient cooling with the Ion™ Communicating Control the
cooling lockout must be set to "Off" in the Wall Control setup.
Defrost
This control offers 4 possible defrost interval times: 30, 60, 90 or 120
minutes. These are selected by dip switches on the unit control board, or
in the Ion™ Communicating Control (if used). The Ion™
Communicating Control selection overrides the control board dip switch
settings.
When using a standard thermostat, the defrost interval times set by the
dip switches are initial settings only and may vary after initial defrost
when Quiet Shift-2 is not activated. When Quiet Shift-2 is activated, the
times set by the dip switch will not vary from the setting.
Auto defrost is available with Ion™ Communicating Control only and it
must be enabled in the Control. Auto defrost adjusts the defrost interval
time based on the last defrost time. The initial interval time is set by the
dip switches when using this mode and are the only way to adjust the
initial time. Quiet Shift-2 can be selected while using Auto Defrost
Mode.
The control board accumulates compressor run time. As the accumulated
run time approaches the selected defrost interval time, the control board
monitors the coil temperature sensor for a defrost demand. If a defrost
demand exists, a defrost cycle will be initiated at the end of the selected
time interval. A defrost demand exists when the coil temperature is at or
below 32°F/0°C for 4 minutes during the interval.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
interface
is
applied
with
The defrost cycle is terminated when the coil temperature reaches
65°F/18.33°C or 10 minutes has passed.
If the coil temperature does not reach 32°F/0°C within the interval, the
interval timer will be reset and start over.
Note:
• Upon initial power up the first defrost interval is defaulted to 30
minutes. Remaining intervals are at selected times as indicated earlier
in this section.
• Defrost is only allowed to occur below 50°F/10°C outdoor ambient
temperature.
• The Quiet Shift-2 compressor on/off delays, as described below, will
be included in a forced defrost if Quiet Shift-2 is enabled.
Defrost Hold
In a non-communicating system, if the thermostat becomes satisfied
before the defrost cycle is terminated, the control will "hold" in defrost
mode and finish the defrost cycle on the next call for heat. Defrost hold
is not needed in a communicating system because the Wall Control will
complete the defrost cycle before shutting down the system.
Forced Defrost
Forced defrost can be initiated manually in a non-communicating
system, or by communicated command from a Wall Control. The board
contains a 2-pin header labeled FORCED DEFROST
a
initiate a forced defrost:
• Manually, short FORCED DEFROST pins for 5 seconds then release
• If coil temp is at defrost temp of 32°F/0°C, and outdoor air
temperature is below 50°F/10°C, a full defrost sequence will occur
• If the coil temp or outdoor air temperature do not meet the above
requirements, an abbreviated 30 second defrost will occur
Quiet Shift-2
Quiet Shift-2 is a field-selectable defrost mode which may eliminate
occasional noise that could be heard at the start and finish of the defrost
cycle. For installations using a standard thermostat, this feature must be
enabled by selecting the 3rd position dip switch on the outdoor control
board. For installations using an Ion™ Control, this feature must be
enabled at the Wall Control. When activated, the following sequence of
operation occurs: Defrost Initiation - the compressor is de-energized for
70 seconds. During this 70 second compressor off time, the reversing
valve will be energized. Once the 70 second compressor off time has
been reached, the compressor will be energized then the outdoor fan will
be de-energized at which time the normal defrost cycle begins. Defrost
Termination - the outdoor fan will be energized shortly before the
compressor is de-energized for 60 seconds. During the compressor 60
second off time, the reversing valve will be deenergized. Once the 60
second compressor off time has been completed, the compressor will be
energized at which time the system will be in normal heat mode.
Liquid Line Solenoid Accessory
In heat pump long line applications, a liquid line solenoid is required to
control refrigerant migration in the heating mode. The solenoid should
be installed near the outdoor unit with the arrow facing the outdoor unit.
This is the direction of flow control. See Long Line Application
Guideline for details.
Accessory Liquid Solenoid with Ion™ Communicating Control:
When using the Ion™ Communicating Control, a liquid line solenoid
output labeled LS is provided. Connect the solenoid as shown in the
wiring label diagram. This is a 24VAC output that is energized whenever
the compressor is energized. It closes in the compressor-off mode to
prevent refrigerant migration into the unit through the liquid line.
Accessory Liquid Solenoid with Non-Communicating Thermostat:
The liquid solenoid is connected to the Y and C terminal connections.
The liquid solenoid closes in the compressor-off mode to prevent
refrigerant migration into the unit through the liquid line.
9
(Fig.
11). To
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