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Arzel® Zoning Technology
(AirBoss™ and 1200 Series Panels)
Troubleshooting Guide
1) VOLTAGE TEST
a) 24 Volt AC
i) Check AC voltage at 24-VAC R & C terminals, no less than 21.6 Volts A/C
should be present from Arzel supplied Transformer
(40 VA for 2, 3, and 4 zone panels)
(100 VA for 6 and 8 zone panels)
b) 24 Volt DC
i) Generate a call for “Y1”, “Y2” & “G” at zone 1 only (use jumpers if needed),
and set all other zones to “Auto Fan” and “Off”. (This will energize all but
one solenoid and put the board under its heaviest load)
ii) With board under full load, there should be no less than 24 Volts DC between
(SOLENOID “ + “) and (BYPASS “ D “) terminals
iii) If 24 Volts AC is present at 24VAC terminals and the DC Volts is less than
24, the board will need replaced
2) TESTING BOARD “OUTPUT” (EQUIPMENT FUNCTION) RELAYS.
a) Turn “Power” switch “ON” (Red LED On) and call for Heat from one or more
thermostats;
i) Is the Red “W1” LED lit at the “HVAC OUTPUT” terminal?
(1) Yes!
LED is on
(a) Check for continuity (0 Ohms) between the “R” and “W1” terminals at
the “HVAC OUTPUT” terminal strip on Arzel board (wires removed).
(b) If no continuity (∞ ohms), the board must be replaced.
(c) If continuity is present (0 ohms), the board is OK and the problem is
with the HVAC equipment or a faulty wire between panel and
equipment.
(i) Turn panel Power switch “OFF” and Check voltage (A/C) between
HVAC Output “R” & “W” terminals (wires connected).
(ii) No Voltage indicates problem with equipment control power or
wiring.
(2) No! LED is not lit - Check for 24v ac between “W1” and “C” terminals at
the calling zone terminals.
(“W1” with an “O” is an illegal call and will be ignored)
(“W2” without a “W1” is an illegal call and will be ignored)
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