A52x Series Refrigeration Controller with Adaptive Defrost Installation Instructions
8
Relay Electrical Ratings
Table 5 on page 8 to Table 9 on page 9 provide the electrical ratings for the control relays in the A52x Controller.
See Table 11 on page 11 for the relay’s duty cycle ratings.
Table 4: A52x Controller High-Voltage Terminal Blocks, Terminals, and Wire Sizes
Terminal
Block Label
Terminal
Voltages
Description, Function, and Requirements Recommended
Wire Sizes
90-240 VAC L1 Two terminals for supply power connection to the A525 Controller.
Requires 90 to 240 VAC; 15 VA, (0.25 A maximum).
0.75 to 2.50 mm
2
(18 to 14 AWG)
L2/N
GND Earth ground connection terminal
Compressor Two terminals for line-voltage, single-pole, single-throw (SPST), dry-
contact relay to control compressor
1.50 to 6.0 mm
2
(16 to 10 AWG)
Alarm L1/LC The common (LC), normally-open (LNO), normally-close (LNC)
terminals for line-voltage, single-pole, double-throw (SPDT), dry-
contact relay to control (user-supplied) alarm devices.
0.30 to 2.50 mm
2
(22 to 14 AWG)
LNC
L2/N/LNO
LO-SPD
AUX
The A525 Controller includes two terminals for line-voltage, SPST,
dry-contact relay to control an auxiliary device such as a user-
provided alarm device or the low-speed on two-speed evaporator
fans. The A524 Controller does not include this relay and terminal
block.
0.30 to 2.50 mm
2
(22 to 14 AWG)
HI-SPD Two terminals for line-voltage, SPST, dry-contact relay to control
single-speed evaporator fans or the high-speed on two-speed
evaporator fans.
0.75 to 2.50 mm
2
(18 to 14 AWG)
Defrost Two terminals for line-voltage, SPST, dry-contact relay to control
resistive defrost heater or bypass defrost solenoid.
1.5 to 6.0 mm
2
(16 to 10 AWG)
HVBIN Two line-voltage binary input terminals for use with the line-voltage
defrost temperature termination switch. These terminals require an
external power source to provide 120 to 240 VAC, 50/60 Hz
activation power when the external, user-supplied defrost
termination switch closes.
0.30 to 1.50 mm
2
(22 to 16 AWG)
Table 5: SPST Compressor Relay Electrical Ratings
Agency and File UL 60730 EN 60730
Applied AC Voltage at 50/60 Hz 24 VAC 120 VAC 240 VAC 240 VAC
Horsepower -- 1 HP 1 HP 1 HP
Full Load Amperes -- 16 A 8 A 8 A
Locked Rotor Amperes -- 96 A 48 A 48 A
Resistive Amperes 10 A -- -- --
Pilot Duty VA 125 VA at 24 to 240 VAC
Table 6: SPDT Alarm Relay Electrical Ratings
Agency and File UL 60730 EN 60730
Applied AC Voltage at 50/60 Hz 24 VAC 120 VAC 240 VAC 240 VAC
Horsepower (LC/LNO and LC/LNC) -- 1/2 HP 1/2 HP 1/2 HP