System information

Carrier Geothermal Heat Pump Systems
15
Residential Products Technical Guide
Two-Way Unit Communicating System
AIRFLOW SELECTION
CFM
HEAT STAGE 1 600
HEAT STAGE 2 750
AUXILIARY HEAT 850
EMERGENCY HEAT 850
COOL STAGE 1 525
COOL STAGE 2 700
COOL DEHUMID 1 425
COOL DEHUMID 2 550
CONTINUOUS FAN 350
HEAT OFF DELAY 60
COOL OFF DELAY 30
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POSSIBLE FAULT CAUSES
LOW WATER COIL TEMP
LOW WATER TEMP - HTG
LOW WATER FLOW - HTG
LOW REFRIG CHARGE - HTG
INCORRECT LT1 SETTING
BAD LT1 THERMISTOR
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FAULT TEMPERATURE CONDITIONS
LT1 LOW WATER TEMP
HEAT 1 11:11 AM 11/14
LT1 TEMP 28.1
LT2 TEMP 97.3
HOT WATER EWT 121.5
COMP DISCHARGE 157.7
LEAVING AIR 92.7
LEAVING WATER 34.9
ENTERING WATER 42.1
CONTROL VOLTAGE 26.4
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Two-Way Communication System and a Gateway Into the
GT-PC (50YG) and GT-PB (50YF) Digital Systems
GT-PC (50YG) and GT-PB (50YF) Digital are equipped with a
Two-Way Communication System that allow users to interact
with their geothermal system in plain English AND delivers
improved reliability and effi ciency by precisely controlling
smart variable speed components.
Precise operation:
The Microprocessor on the new DXM2 board enables
intelligent, 2-way communication between the DXM2 board
and smart components like the communicating thermostat,
fan motor, and water pump. The control can also directly
control the modulating valve and accepts various feedback/
input (see fi gure). The Intelligent DXM2 board uses
information received from the smart components and sensors
to precisely control operation of variable speed fan, variable
speed water pump (or modulating valve) to deliver higher
effi ciency, reliability and increased comfort.
Plain English communication:
Two-Way Communication System allows the user to interact
with their GT-PC (50YG) and GT-PB (50YF) Digital system in
PLAIN ENGLISH, through digital communicating thermostat
(ATC) or confi guration / diagnostic tool (ACDU). It enables
confi guration, monitoring and diagnostics of the system from
the thermostat.
Confi guration – Installers can confi gure GT-PC (50YG) and
GT-PB (50YF) Digital units from the thermostat, including:
Air fl ow, entering/leaving water ∆T, water-fl ow option
confi guration, unit confi guration, accessory confi guration,
and demand reduction (optional, to limit unit operation during
peak times).
Monitoring and Diagnostics – In the rare case there’s an
issue with the unit, the unit will communicate “Service
needed” to the thermostat for consumers to see. From the
thermostat, a consumer can also access dealer information
(if programmed), fault description, possible causes and
current system status (temperature readings, fan RPM and
water fl ow status) to help the servicing contractor understand
what’s happening with the unit even before a service visit.
Once the servicing contractor is on the job, in “service mode”,
the technician can diagnose the units much faster with
possible causes shown on the thermostat and with system
operating conditions at the time of the fault.
With the Two-Way Communication System, consumers and
contractors have a gateway to system information.
GT-PCS Split Systems offer all communications features as
described for packaged systems except for fan motor and
communicating thermostat.
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Communicating
Thermostat
Fan
Mot.
Modulating
Valve
Variable
Speed
Pump
Sensors
Two-Way
Communication
One-Way
Communication
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