Final Check List; Sensor Probe - Master Bilt TAF-27 Installation & Operation Manual

ELECTRICAL CONNECTIONS
The controller is provided with screw terminal block to connect cables with a cross section up to 2,5 mm
Before connecting cables make sure the power supply complies with the control's requirements. Separate the
probe cables from the power supply cables, from the outputs and the power connections. Do not exceed the
maximum current allowed on each relay, in case of heavier loads use a suitable external relay.
PROBE CONNECTIONS
The probes shall be mounted with the bulb upwards to prevent damages due to casual liquid infiltration. It is
recommended to place the thermostat probe away from air streams to correctly measure the average room
temperature. Place the defrost termination probe among the evaporator fins in the coldest place, where most
ice is formed, far from heaters or from the warmest place during defrost, to prevent premature defrost
termination.

FINAL CHECK LIST

A. Check operating pressures.
B. Check electrical requirements of unit to supply voltage.
C. Set temperature control for desired temperature range.
D. Check system for proper defrost settings and operation.
E. Check condensing unit for vibrating or rubbing tubing. Dampen and clamp as required.
F. All valves should be completely open counter-clockwise.
G. Check packing nuts on all service valves.
H. Replace all service valve caps and latch unit covers.

SENSOR PROBE

NOTICE: If the probe assembly is disconnected from the main board during normal operation (unit running),
the connectors must be installed in the same position that they had before disconnection (P1 and P2),
otherwise the control will not function properly.
In case of a probe failure, the control will go into a safety mode of operation. While in safety mode the control
ignores probe inputs and cycles the compressor on for 6 minutes and off for 4 minutes. To replace the sensor
probes, disconnect power to the control, replace the probes and restart the unit. Since the wire is fixed to the
cabinet, a technician may cut the sensor wire inside the cabinet and splice it with a new sensor.
SENSOR PROBE TEMPERATURE AND RESISTANCE
Temperature
°F
-31
-22
-12.5
-4
5
14
23
32
41
50
59
68
77
86
°C
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
36
11
Resistance
Ohms
144,100
111,300
86,430
67,770
53,410
42,470
33,900
27,280
22,050
17,960
14,690
12,090
10,000
8313
2
.