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guide by:
Housing
Blow Patterns
3 way (D3)
2 way opposite (D2)
VARITHERM SMALL SQUARE VAV DIFFUSER
2 way corner (D2C)
1 way (D1)
Probe
BLOW PATTERNS (VKD-HC, VKD-C, VKD-D)
FIG. 7 FIELD INSTALLED FOAM BAFFLE
Fig 7. Field installed foam baffle
6
VARITHERM SMALL SQUARE VAV DIFFUSER - Manual | priceindustries.com/vavdiffusers
Reduction
.80
.64
.59
.45
Figure 7 @ 200%
THERMA-FUSER
DIFFUSER
A major selling feature of the VKD-HC diffusers is the ability to
easily add or remove blow patterns in the field. This is done by
blocking the air off behind the blades on the appropriate sides.
DO NOT:
•
Disconnect the spokes.
•
Tape, screw or otherwise lock the blade closed. This
unbalances the loads on the center bearings.
•
Block the venturi nozzle.
DO block air flow behind the blades or between the standoffs.
(Standoffs are the supports between the housing and the
diffusion plate.) Ways to do this are:
1.
Factory installed directional baffles. These are strips of
metal wrapped around the standoffs to block one, two or
three sides. These can be removed in the field after first
removing the diffusion plate assembly.
2.
Field installed directional baffles. These are made of
1-
"/ 28.575mm diameter x 5-
1
/
8
(Armaflex) for
between the housing and the diffusionplate/blade
assembly and wedge between the standoffs (See Fig. 7).
Take care to clear the damper hinges sothat the damper
operates freely.
The rule for blocking the appropriate side is: Always block the
thermostat side. (See Fig. 7 for examples.)
NOTE:
Some earlier VBD-C and VBD-CW models have one
induction slot by the thermostat instead of four venturi nozzles.
Page 3 of 6
The rule for blocking the appropriate side for this version is:
Never block the thermostat side.
When blocking for direction, the air volume for a given
static pressure is reduced from max. air volume listed in the
performance guide by:
Blow Patterns
3 way (D3)
2 way opposite (D2)
2 way corner (D2C)
1 way (D1)
"/143mm longinsulation
5
/
8
"/ 9.525mm refrigerationlines. Insert
3
/
8
Blade Opening
0.80
0.64
0.59
0.45
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