Module Power and Miscellaneous I/O
80 RTHC-SVD01B-EN
13-7. Options Module (1U5)
13-7 a. Test Points
There are two test points (TP) associated with the Options module.
They are easily read with a DC voltmeter by probing the PC board sol-
der pads found in the upper left hand corner of the module. The posi-
tive meter lead should be connected to the pad while referencing the
negative meter lead to the board edge ground plane.
Do not use the aluminum module enclosure as the reference as it
has an anodized surface with insulating properties.
J2-1 or 3 to
J2-2 or 4
Input Power 24 VAC, Refer to Power Supply
J5-1, 2 Saturated Evaporator Refrigerant
Temperature Sensor
Refer to Temperature Sensor Checkout
X13790159-02
J5-3, 4 Compressor Discharge Sensor Refer to Temperature Sensor Checkout
X13790159-02
J7-1,2,3 Evap Refrigerant Liquid Level Sensor 5 VDC Supply, 0.7 to 4.2 Volts Linear output
over range of ± 1". Midpoint of sensor
mounted approx. 3.5" from bottom of evap.
J8-2, 4 EXV Winding 1 Refer to Section 7: Electronic Expansion
valve Checkout
J8-1, 3 EXV Winding 2 Refer to Section 7: Electronic Expansion
valve Checkout
J11-1, 2 Low Pressure Cutout open: 24 VAC: Trip
closed: 0 VAC: Normal operation
If the switch is open for more than 0.5-2
seconds unit will trip on Low Evap Rfgt
Pressure.
J11-3,4 Saturated Cond Rfgt Temp Sensor Condenser Limit control and Differential
pressure functions and protection.
Refer to Temperature Sensor Checkout
X13790159-02
Table 13-7: Stepper Module Nominal Terminal Voltages (1U3)
Terminal
Designation
Description of Circuit
Normal Terminal Voltages for Various
Conditions
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