Troubleshooting - Aprilaire 8400 Series Safety & Installation Instructions

TROUBLESHOOTING

COOLING SYSTEM DOES NOT RESPOND
("COOLING" APPEARS ON SCREEN)
• Check for 24 VAC at the equipment on the secondary
side of the transformer between power and
common . If voltage is not present, check the cooling
equipment to find the cause of the problem .
• Check for 24 VAC between the cooling terminal (Y)
and the transformer common . If 24 VAC is present,
the thermostat is functional . Check the cooling
system to find the cause of the problem .
• Check for loose or broken wires between the
thermostat and the cooling equipment .
FAN DOES NOT TURN ON IN A CALL FOR HEAT
• Check System Setting #02 (Fan Control), to make
sure the fan control is properly set to match the type
of system (see page 11) .
HEAT PUMP ISSUES COOL AIR IN HEAT MODE,
OR WARM AIR IN COOL MODE
• Check System Setting #12 (Reversing Valve), to make
sure it is properly configured for your system (see
page 11) .
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HEAT/COOL BOTH ON AT SAME TIME
• Check SW1 (Equipment Type), to make sure it is set
to match the installed heating/cooling equipment
(see page 12) .
• Check to make sure heating and cooling wires are
not shorted together .
HEATING EQUIPMENT IS RUNNING IN
COOL MODE
• Check SW1 (Equipment Type), to make sure it is set
to match the installed heating/cooling equipment
(see page 12) .
"HEATING" IS NOT DISPLAYED
• Change the System Mode to Heat, and set
the temperature level above the current room
temperature .
"COOLING" IS NOT DISPLAYED
• Change the System Mode to Cool, and set
the temperature level below the current room
temperature .
SPECIFICATIONS
Operating: 32° to 120°F (0° to 48 .9°C)
Temperature
Shipping: -30° to 140°F (-34 .4° to 60°C)
Relative humidity Operating: 5% to 90% R .H . (non-condensing)
Operating voltage 24 VAC (18 – 30 VAC)
Maximum: 2 .5A (total), 1 .0A (single output)
Current
Maximum surge current: 5A
Dual power . Can be battery or 24 VAC powered .
Power supply
When both the sources are available, battery will be used as
back up power .
Battery power: AA size alkaline battery x 2
Battery power
Battery life: Approximately 1 year
Environment
Electrical
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