2
(a) 24 vac present -- If the “W1” LED (top red) is lit at the zone calling,
replace the board
(Try resetting the power switch on the board in case of power interference trip-up)
(Check to make sure that the Master Zone Control function switch is “Off”)
(b) No 24vac present --Problem is with the Thermostat or wiring from
thermostat to the Arzel panel.
ii) Repeat the above procedure for any function demand that does not work
properly, i.e.
Cooling (Y1 G), Fan (G), 2
ND
Stg Heat (W2).
3) DAMPER OPERATION.
a) To verify proper pressure or vacuum to a damper, insert a tee in the tube
connected to that damper actuator and read with a Magnehelic or Digital pressure
gauge. (Normal press/vac reading will be approximately 30 in. to 40 in. wc. Or (1
to 2) psi)
b) To close a damper it must see a positive pressure of at least 25” wc.
i) An open-ended “Airflow Indicator” (available through Arzel) connected from
the bottom of the indicator to the solenoid port should show pressure by lifting
the ball to the top of the indicator.
c) To open a damper it must see a vacuum of at least -25” wc.
i) An open-ended “Airflow Indicator” connected from the top of the indicator to
the solenoid port should show vacuum by lifting the ball to the top of the
indicator.
4) SOLENOID TESTING
a) With Zone 1 calling for Fan (G) and all other zones off, make the following test;
i) 24 V DC should be present between solenoid terminals (+) and (2, 3, & 4)
(1) An open-ended “Airflow Indicator” connected from the bottom of the
indicator to the solenoid (2, 3, & 4) port should show pressure by holding
the ball to the top of the Indicator.
(Solenoids are energized (pressure) to close dampers)
ii) 0 V DC should be present between solenoid terminals (+) and (1)
(1) An open-ended “Airflow Indicator” connected from the top
of the
indicator to the solenoid port should show vacuum by holding the ball to
the top of the cylinder.
(Solenoids are de-energized (vacuum) to open dampers)
b) Ohm Test
i) Disconnect the solenoid lead from its numbered “SOLENOID” terminal.
ii) Set Ohmmeter @ 1K or higher, read across the loose lead and “ + “ terminal.
iii) Ohms should be between 850 and 950 ohms
c) If reading low pressure and/or vacuum readings at all zones (dampers not moving
fully open and/or closed) check solenoid as follows.
Test each solenoid individually for “Bleed Through” by removing the vacuum
hose (n/o port) and plugging the disconnected tube and the open port, if remaining
zones commence to operate properly the solenoid is faulty.
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