Bryant TSTATBBN2S01-C Manual de instalación descargar pdf (Pagina 31)

Residential H&V - 60Hz R22 & R410A - Geothermal Heat Pumps - Rev.: 21 Aug, 2007D

ELECTRICAL - LOW VOLTAGE WIRING

Figure 20: GT-PX/GT-PG Low Voltage

Field Wiring

Low voltage ﬁ eld wiring for units with ECM fan

Low voltage

ﬁ eld wiring

for units with

PSC FAN

(ECM board

will not be

present)

Figure 21: GT-G Low Voltage Field Wiring

Figure 22: FP1 Limit Setting

CXM PCB

JW3-FP1

jumper should

be clipped for

low temperature

operation

Thermostat Connections

The thermostat should be wired directly to the CXM board

(units with PSC fan). Units with optional ECM motor

include factory wiring from the CXM board to the ECM

interface board. Thermostat wiring for these units should

be connected to the ECM interface board. Figure 21

shows wiring for 50YC units; Figure 20 should be used for

50YD/50YE units with PSC or optional ECM motor. See

“Electrical – Thermostat” for speciﬁ c terminal connections.

Rev.: 3/24/00

Contactor - CC

Capacitator

Loop PB1 HWG PB2

CXM Control

Low Voltage

Connector

Transformer

Circ Brkr

Grnd

Low Water Temperature Cutout Selection

The CXM control allows the ﬁ eld selection of low water

(or water-antifreeze solution) temperature limit by clipping

jumper JW3, which changes the sensing temperature

associated with thermistor FP1. Note that the FP1

thermistor is located on the refrigerant line between the

coaxial heat exchanger and expansion device (TXV).

Therefore, FP1 is sensing refrigerant temperature, not

water temperature, which is a better indication of how water

ﬂ ow rate/temperature is affecting the refrigeration circuit.

The factory setting for FP1 is for systems using water

(30°F [-1.1°C] refrigerant temperature). In low water

temperature (extended range) applications with antifreeze

(most ground loops), jumper JW3 should be clipped as

shown in Figure 22 to change the setting to 10°F [-12.2°C]

refrigerant temperature, a more suitable temperature

when using an antifreeze solution. All residential units

include water/refrigerant circuit insulation to prevent

internal condensation, which is required when operating

with entering water temperatures below 59°F [15°C].

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Bryant TSTATBBN2S01-C Manual de instalación Pagina 31

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