AAON HB-005 - Manual (Page 16)

16
Each HB has a standard Cooling Lock-out feature that
prevents the compressor cooling mode when the
outdoor temperature is below 55
°F. Each unit also
has a condenser fan cycle feature that delays the start
of the condenser fan until there is satisfactory
compressor discharge pressure.
Three colored LEDs are furnished on the circuit board
immediately above the low voltage terminals to provide
status information as listed in the Table 14.1.
Every unit is furnished with a high and low pressure
sensor, as well as an outdoor air temperature sensor.
These sensors provide a signal to the control board
that also present a fault condition or Mode indicator at
the LEDs with a blink rate code.
Blink Rate:
1 second ON and 1 second OFF.
3 seconds OFF before repeating.
Optional Control Board
This Control Board is supplied within the HB Model
when it has been furnished with certain optional
features specified by the customer. Among these are
an Economizer, Return Air Bypass, and Hot Gas
Reheat.
Thermostat
The low voltage room thermostat should be located on
an inside wall 4 to 5 feet above the floor where it will
not be subjected to drafts, sun exposure or heat from
electrical fixtures or appliances. The control wire size
must be large enough to prevent excess voltage drop
that may cause improper operation of the equipment.
The HB control board has approximately a 1/2 amp
current flow through the thermostat. Follow the
thermostat manufacturer’s instructions to set the heat
anticipator.
Length of Wire Run
T-stat Load Amps 50 Ft. 100 Ft. 150 Ft.
HB - Less than 1.0 18ga. 18ga. 16ga.
Single Stage Heating & Cooling
The R, G, Y & W terminals on a single stage
thermostat should be connected to the similarly
labeled terminals on the Control Board in the HB unit.
Table 16.1, Standard Control Board Blink Codes
Red LED
Fault Condition Blinks
Hi Pres Lockout 2
Lo Pres Lockout 3
Bad Outdoor Air Temp Sensor 5
Clogged Filter 7
When unit is off, yellow LED is off.
Yellow LED
Mode Indicator Blinks
Vent Mode 1
Heating Mode 2
Cooling Mode 3
When no fault exists, red LED is off.
Lowest number is highest priority.
Green LED
Power Status Only – Blinking Indicates Communications
Standard Control Board Blink Codes
Table 16.3, Low Voltage Thermostat Field Wiring Size
Table 16.2, Optional Control Board Blink Codes
Red LED
Fault Condition Blinks
Hi Safety Lockout 1
Hi Pres Lockout 2
Lo Pres Lockout 3
Bad Supply Air Temp Sensor 4
Bad Outdoor Air Temp Sensor 5
Clogged Filter 7
When unit is off, yellow LED is off..
Yellow LED
Mode Indicator Blinks
Vent Mode 1
Heating Mode 2
Cooling Mode 3
Economizer Cooling 4
Dehumidification Mode 5
Economizer Dehumidification Mode 6
When no fault exists, red LED is off.
Lowest number is highest priority.
Green LED
Power Status Only – Blinking Indicates Communications
Optional Control Board Blink Codes