Table 4 — DIP Switch Configuration
SETTING 1 2 3 4 5 6 7 8
OPEN ——
Expansion
Board
Operation
Field
Test
ON
Modulated
Power
Exhaust
Time Guardா
Override ON
Gas Heat
Heat Pump
Operation
IN CONJUNCTION
WITH FIELD TEST —
Set Minimum
Damper Position
CLOSED CV
Thermostat
Used
Base Control
Board Only
Field
Test
OFF
CV
Power
Exhaust
Time Guard
Override OFF
Electric Heat
Air Conditioner
Operation
LEGEND
CV — Constant Volume
NOTES:
1. TheOPEN side of theDIP switchis marked ‘‘OPEN.’’When the rocker
switch is on the ‘‘OPEN’’ side of the switch, the switch is open.
2. When the unit is being field-tested (DIP switch 4 to OPEN), the func-
tion ofDIP switch 6changes and itis used toset the minimumdamper
position.
Table 5 — DIP Switch Factory Settings
UNIT 12345678
580G,H Closed Closed Closed Closed Closed Closed Open Closed
• DIP switch 6 configures the Time Guard override and,
when used with the field test function, sets the mini-
mum damper position
• DIP switch 7 configures the unit for gas heat or elec-
tric heat
• DIP switch 8 configures the unit for heat pump or
air conditioner operation
10. Adjust economizer. Check that outdoor-air damper is
closed and return-air damper is open.
IMPORTANT: Unit power must be on for 24 hours prior to
start-up. Otherwise, damage to compressor may result.
11. The optional non-modulating power exhaust is a two-
stage design where the operation of the exhaust fans
is linked to economizer position. When the supply fan
is running and the economizer is 25% open, the base
module closes contacts, activating 2 exhaust fans. When
the economizer position reaches 75% open,the base mod-
ule activates the other 2 exhaust fans. The fans will
turn off when the economizer closes below the same
points.
START-UP
I. COOLING SECTION START-UP AND ADJUSTMENTS
CAUTION:
Complete the required procedures given
in the Pre-Start-Up section on page 20 before starting
the unit.
Do not jumper any safety devices when operating the
unit.
Do not operate the compressor when the outdoor tem-
perature is below 40 F (unless accessory low ambient
kit is installed).
Do not rapid-cycle the compressor. Allow 5 minutes
between ‘‘on’’ cycles to prevent compressor damage.
A. Checking Cooling Control Operation
Start and check the unit for proper cooling control operation
as follows:
Place SYSTEM switch in COOL position and FAN switch in
AUTO. position. Set cooling control below room temperature.
Observe that compressor, condenser fan motor, and evapora-
tor blower motors start. Observe that cooling cycle shuts down
when control setting is satisfied.
B. Cooling Sequence of Operation
On power up, the control module will activate the initializa-
tion software. The initialization software reads DIP switch
no. 1 to determine it is in the closed position. Next, DIPswitch
no. 2 is read to determine it is closed for thermostat opera-
tion. The initialization sequence clears all alarms and alerts;
re-maps the input/output database for operation; sets maxi-
mum heat stages to 2; and sets maximum cool stages to 3.
Power up takes a random 1 to 63 seconds plus 5 minutes.
The TSTAT function performs a thermostat based control by
monitoring Y1, Y2, W1, W2 and G inputs. These functions
control stages: cool1, cool2, heat1, heat2 and the indoor fan,
respectively.
The control module will operate economizer and run diagnos-
tics to monitor alarms at all times.
If the thermostat energizes the G input, the control module
will turn on the indoor fan and open the economizer dampers
to minimum position. If thermostats are used to deenergize
the G input, the control module will turn off the indoor fan
and close the economizer dampers.
When cooling, G must be energized before cooling can oper-
ate. The control module determines if outdoor conditions are
suitable for economizer cooling. For the economizer to func-
tion for outside air cooling: the enthalpy must be below the
enthalpy set point; the outdoor-air temperature must be equal
to or less than 65 F; the SAT (supply-air temperature) ther-
mistor must not be in alarm; and the outdoor air reading is
available. When these conditions are satisfied, the control mod-
ule will use economizer as the first stage of cooling.
When Y1 input is energized, the economizer will be modu-
lated to maintain SAT at the set point temperature. The
default is 55 F. When SAT is above the set point, the econo-
mizer will be 100% open. When SAT is below the set point,
the economizer will modulate between minimum and 100%
open position. When Y2 is energized, the control module will
turn on compressor 1 and continue to modulate the econo-
mizer as described above. If the Y2 remains energized and
the SAT reading remains above the set point for 15 minutes,
—21—
