12
IM 725 (1-02)
Step 3
Make Piping Connections
Be sure the hot and chilled water supply and return system are
thoroughly flushed and cleaned before connecting piping to the
unit ventilator.
In All Systems
Be sure to install the control valve(s) on the correct unit ventilator.
Indiscriminate mixing of valves in the field can result in valves
improperly sized for the desired flow rate, which can result in poor
operation and coil freezeups. Install control valve so there is at least
2" (51mm) minimum clearance to remove the actuator from the valve
body.
Be certain that the control valve is installed correctly, with its
orientation vertical. Valves should be installed at least 5
°
off center.
Be certain that the control valves are installed with the proper
port orientation to provide proper flow and fail safe operation.
Incorrect installation can result in improper unit operation, and/
or the possibility of coil freeze-up.
With future servicing considerations in mind, use standard, field-
supplied shutoff valves and union connections; this permits easy
removal of the coil or control valve if servicing is required.
While brazing have an extinguisher readily available. Wear
appropriate eye and hand protection. Ensure all areas with
shared ventilation have ample fresh air ventilation.
Refer to figure 1 and figures 22 through 27 and attach the unit
ventilator to the wall through the four (4) mounting holes provided,
using field-supplied fasteners appropriate to the wall construction and
the washers provided in the brown envelope with these instructions
(figure 25). Envelope also contains allen wrench to provide access to
unit. Push the unit ventilator tight to the wall structure so that the
outdoor air seals are compressed. Secure the wall fasteners to prevent
the unit ventilator from moving and tipping over.
Remove moldings
behind unit
Before setting the unit ventilator in place, if it is a cooling unit, check
the condensate drain hand connection to be sure it is the same as the
cooling coil hand of connection, and that it agrees with the drain stub-
up. If necessary, move condensate drain cap to the opposite end.
Do
not discard (see figure 24).
Before setting the unit ventilator in position, be sure that field-
supplied electrical connections are in place, de-energized and in
accordance with the plans.
Move the unit ventilator into position against the wall surface. Check
to see that the unit ventilator is level, from end to end and back to front.
Using a 4' level is recommended. Leveling bolts are located at each
end of the front kickplate (see figure 27).
Unit must be anchored to an internal wall column or other suitable
support (see figure 1, page 3)
11"
(279 mm)
7
⁄
8
"
22 mm)
O.D. Copper
Drain
7
⁄
8
"
(22 mm)
O.D. Copper
Drain
5"
(127 mm)
Condensate
Drain
Figure 24 - Move Condensate Drain Cap To Opposite End of Drain Stub-Up.
Left Hand
Front View of End Compartment
Right Hand
11"
(279 mm)
Figure 25 - Shipping Envelope Contents
Figure 26 - Setting The Unit Ventilator In Place
Figure 27 - Leveling Legs Location
DANGER
!
Disconnect all electrical power before servicing unit to prevent
injury or death due to electrical shock.
CAUTION
!
CAUTION
!
WARNING
!
CAUTION
!
