To change the "Fresh Air From Outside" from the side
to the top use the following directions. For port locations
see Appendix B.
Remove the cover of the damper motor with a flat screw
driver. Reverse the Orange and Red wires by moving the
Orange from terminal #2 to terminal #3 and moving the
Red wire from terminal #3 to terminal #2. The end result,
in order to have the "Fresh Air From Outside" connection
to the top port, will be; #1 - White, #2 - Red, #3 - Orange.
Internal Grilles and Diffusers
Locate exhaust grilles and supply diffusers to provide
effective ventilation and avoid short circuiting of airflows.
Adjustable dampers should be provided at every grille
and diffuser location to make balancing of the system
possible.
A proper selection of style and size of grilles and dif-
fusers is required to minimize pressure drop. The velocity
of the airflow should not exceed 400 ft/min [2 m/sec] for
normal applications.
The duct system should be designed according to the
high speed flow rate of the unit. In order to keep the noise
and pressure drop to a minimum, a maximum air velocity
of 1100 ft/min [5.6 m/sec] should be used in calculations
in duct design. The duct runs should be kept as short as
possible with the minimum amount of elbows and transi-
tions. The manufacturer recommends the use of smooth
radius elbows or square elbows with turning vanes to
achieve maximum performance.
Drains
The drain fittings provided with the unit will accept a
3/4" [19mm] NPT coupler (supplied by others). The drain
line for the unit must be fabricated on-site and connected
to the building main. A loop in the hose or trap in the cop-
per or plastic pipe must be provided to prevent sewer
gases from entering the unit when connecting to a drain
as illustrated in Appendix D.
NOTE:
Consult local building code for plumbing require-
ments in your area. If copper pipe is to be used,
ensure not to solder to the 3/4" [19mm] coupler
while it is attached to the plastic drain fitting as
deformation may occur. Ensure adequate slope is
present to allow good drainage (minimum 1/4"/foot
or 6mm/305mm).
Electrical Connections
Power
A terminal block and strain relief bushing or a junction
box is provided for line voltage to make the necessary
power connections.
The electrical requirements are as follows:
Control Box Access For Low Speed Setting
(600 cfm/1
150
cfm only)
Disconnect power to the unit. Remove the four screws
securing the cover plate as shown in Appendix F. Lift off
the control cover plate and switch the red wire as shown
in Appendix F.
Controls
General Information
Fan Interlock Switch
(FF)
External fan control can be achieved by connecting an
external fan source (G) through dry contacts (FF). These
contacts are closed on a call for ventilation or frost control.
Speed Selection
(600 cfm/1
150
cfm only)
There are three speed settings available with the con-
trols, only two of which can be functional at any one time.
The units are factory set to use the low and high speed
taps on the blower motors. If necessary, the medium
speed tap can be used instead of the low speed tap. See
Appendix F for instructions on how to make this change.
Units without the remote wall control option can be shut
off by opening the contact between LOW - COM or HIGH
- COM as shown in Appendix E-2.
Sequence of Operation
Before start-up, check the unit for obstructive packaging,
objects near or in blowers, dampers, heat exchangers, etc.
Once installation is complete, check all modes of operation
to ensure that the unit is working properly. Close the doors
and check for operation on LOW, COM and HIGH. Use a
wall control or the dry contact switching to run fan speeds
as shown in Appendix E-2.
The 700 cfm unit is two speed. Low speed can be initi-
ated by creating a closure across LOW - COM or high
speed can be initiated by creating a closure across HIGH
- COM.
VOLTAGE
120V
120V
120V
MCA
8.6
5.6
13.3
MOP
12
8
15
600 cfm
700 cfm
1
150
cfm
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