Reznor ZQYRA Unit Installation Manual - Manual (Page 12)

Form I-ZQYRA P/N 260414R5, Page 12
6.0 Mechanical
(cont’d)
6.2 Inlet Air and Exhaust Air Openings (cont’d)
If equipped with optional intake and exhaust dampers, the intake damper has a motor-
ized actuator and the exhaust damper has a barometric control.
The intake damper has a 24volt, two-position, spring return actuator directly inter-
locked with the supply fan. The actuator opens the damper whenever the supply fan
is commanded to operate. When the supply fan is off, the actuator’s spring drives the
damper closed.
The exhaust hood features a low leak gravity operated back draft damper. The exhaust
damper starts to open at 0.03” w.c and is fully opened at 0.10” w.c.
6.2.4 Inlet and
Exhaust Dampers,
Option AR2Y
6.2.3 Inlet Air Hood (cont’d)
6.3 Duct
Connections
and Ductwork
Duct Connection Configuration
This unit has both vertical and horizontal supply and return air duct opening locations
so ductwork connection openings being used depend on the installation.
Installation using Horizontal Ductwork - See locations of the horizontal duct open-
ings in FIGURE 10, page 9, and dimensions in FIGURE 1, page 4. Remove the cover
from the horizontal return air opening and re-locate it to cover the vertical return air
opening in the bottom of the cabinet. Remove and discard the cover from the hori-
zontal supply (discharge) air opening. Shipped in the carton with the hood parts (see
Paragraph 6.2), find the cover for the vertical supply air opening. Install the cover to
close the vertical supply air opening.
Installation using Vertical Ductwork - Vertical ductwork connection flanges are in the
roof curb; see dimensions in FIGURE 8, page 8. If vertical ductwork was not installed
from the top or a field-supplied curb is used, a transition may be required for attaching
ductwork. When using vertical ductwork, the horizontal duct opening covers should not
be removed and the vertical supply duct cover shipped in the hood carton will not be
used. .
Requirements and Suggestions for Ductwork Design and Installation
Before operating the unit, be sure that the unused supply and return air openings are
closed with the covers provided.
CAUTION: An external duct system static pressure not within the
limits shown on the rating plate may overload the motors. See
Hazard Levels, page 2.
• Type of Ductwork - The type of duct installation to be used depends in part on
the construction of the roof (whether wood joist, steelbar joist, steel truss, pre-cast
concrete) and the ceiling (whether hung, flush, etc.).
• Ductwork Material - Rectangular duct should be constructed of not lighter than
No. 26 U.S. gauge galvanized iron or No. 24 B & S gauge aluminum.
• Ductwork Structure - All duct sections 24 inches (610mm) or wider, and over 48
inches (1219mm) in length, should be cross broken on top and bottom and should
have standing seams or angle-iron braces. Joints should be S and drive strip, or
locked.
• Through Masonry Walls - No supply air duct should come in contact with
masonry walls. Insulate around all air ducts through masonry walls with not less
than 1/2" (13mm) of insulation. 1" (25mm) is recommended.
• Through Uncooled/Unheated Space - Insulate all exposed supply air ducts
passing through an uncooled or unheated space with at least 1/2" (1" is
recommended) of insulation.
• Duct Supports - Suspend all ducts securely from buildings members. Do not
support ducts solely by the unit duct connections.
Indoor Installation
NOTE: If installing
this ventilation unit
indoors, exhaust and
supply airflow will be
double. Ductwork and
louvers must be sized
accordingly.
(Size 8 - CFM Range is
500-1100; Size 12 - CFM
Range is 900-1500)
Example: A Model
ZQYRA 12 installed
indoors operating at
1500 cfm will require
supply and exhaust
ductwork sized for 3000
cfm.
hood top flange under the edge of the cabinet top. (If needed, loosen the screw
in the cabinet top.) Matching holes, attach the hood on both sides and across the
top.
To complete the installation, slide the filter (M) in place and attach the filter access
panel (K).