Optional Economizer/Motorized Damper Rain; Hood; Optional Power Exhaust/Barometric Relief; Damper Rain Hood - York SUNLINE MagnaDRY DR240 Installation Manual

284811-YIM-C-1008
hood to the panel. The top flange of this hood slips in
under the top of the access panel opening when install-
ing. Refer to Vent and Combustion Air Hood Figure 8.
Each vent hood is installed by inserting the top flange
of the hood into the slotted opening in the access panel
and securing in place.
The products of combustion are discharged horizon-
tally through these two screened, hooded vent open-
ings on the upper gas heat access panel.
VENT AIR
OUTLET
HOODS
COMBUSTION
AIR INTAKE

HOOD

FIGURE 8 - VENT AND COMBUSTION AIR HOOD
An adhesive backed label is provided over the
outside of the combustion air inlet opening to
prevent moisture from entering the unit, which
could cause damage to electrical components.
Allow this closure label to remain in place until
the combustion air hood is to be installed.

OPTIONAL ECONOMIZER/MOTORIZED DAMPER RAIN

HOOD
The instruction for the optional economizer/motorized
damper rain hood can be found in the kit. Use these
instructions when field assembling an economizer rain
hood onto a unit. The outdoor and return air dampers,
the damper actuator, the damper linkage, the outdoor
and return air divider baffles, and all the control sen-
sors are factory mounted as part of the "Factory
installed" economizer option.
16

OPTIONAL POWER EXHAUST/BAROMETRIC RELIEF

DAMPER RAIN HOOD

The instructions for the power exhaust/barometric relief
damper rain hood can be found in the kit. The exhaust
fan, all supporting brackets, angles, and the wiring are
factory installed as part of the power exhaust option.
OPTIONAL ECONOMIZER AND POWER EXHAUST
DAMPER SETPOINT ADJUSTMENTS AND INFORMATION
Remove the economizer access panel from the unit.
Loosen but do not remove the two panel latches.
Locate the economizer control module, where the fol-
lowing adjustments will be made.
SLOTTED
OPENINGS IN
ACCESS PANEL
Extreme care must be excercised in turning all
setpoint, maximum, and minimum damper
positioning adjustment screws to prevent twist-
ing them off.
Check that the damper blades move smoothly without
binding; carefully turn the Minimum Position Adjusting
screw (found on the damper control module) fully
clockwise and then set the thermostat indoor fan switch
GAS HEAT
ACCESS
to the on position and then off, or energize and de-
PANELS
energize terminals "R" to "G".

MINIMUM POSITION ADJUSTMENT

With thermostat set to indoor fan on position, or termi-
nals "R" to "G" energized, turn the Minimum Position
Adjusting screw (located on the damper control mod-
ule) counterclockwise until the desired minimum
damper position has been attained.

ENTHALPY SETPOINT ADJUSTMENT

The enthalpy setpoint may now be set by selecting the
desired setpoint shown in the Enthalpy Setpoint Adjust-
ment Figure 9. Adjust as follows:
• For a single enthalpy operation carefully turn the
setpoint adjusting screw (found on the damper
control module) to the "A", "B", "C" or "D" setting
corresponding to the lettered curve of the Enthalpy
Setpoint Adjustment Figure 9.
• For a dual enthalpy operation, carefully turn the
setpoint adjusting screw fully clockwise past the
"D" setting.

POWER EXHAUST DAMPER SETPOINT

With power exhaust option, each building pressuriza-
tion requirement will be different. The point at which the
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