Temperature Relief Devices; Typical 38Ap Pressure Transducer Wiring; Typical Main Base Board (Mbb) Thermistor Connections; Typical Aux Board (Aux) Thermistor Connections - Carrier 38APS025 Manual

MBB
J8
Fig. 183 — Typical 38AP Pressure Transducer
Wiring
REPLACING TRANSDUCER — The pressure transducer
should be mounted on an access fitting with a Schrader valve.
Fig. 184 — Typical Main Base Board (MBB) Thermistor Connections
Fig. 185 — Typical AUX Board (AUX) Thermistor Connections (Digital Compressor Option Only)
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MBB
J8
AUX
J6
Use caution when removing the transducer. Use a back-up
wrench to secure the fitting while removing and installing the
pressure transducer. Be sure to loop cable and secure with a
wire tie to create a strain relief as shown in Fig. 48 on page 40.
Care should be exercised while removing any device, pres-
sure sensing device or cap from an access fitting. Refriger-
ant system is under pressure. Be sure to use proper personal
protection equipment to guard against accidental exposure
to refrigerant.
Temperature Relief Devices —
perature relief devices to protect against damage from exces-
sive pressures caused by extreme high temperatures (i.e., fire).
These devices protect the high and low side and are installed in
the liquid line between the condenser coils and the liquid line
service valve.
Several styles of thermistors are used in
Thermistors —
the 38AP units. See Thermistors on page 28 for specific infor-
mation on each thermistor. Thermistor connections are made
to both the MBB and AUX Board. See Fig. 184 and 185.
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155
WARNING
All units have tem-
A38-7332