TWO WAY BLOW, OPPOSITE — D2
When blocking for direction with the Acutherm directional
baffles shown above, the air volume for a given static pres-
sure is reduced from max. flow listed in the performance
guide by:
Reduction
Inlet Designation 3 way
2 way Corner 2 way Opposite
6
.99
.99
1.00
8
.97
.86
.87
10
.88
.75
.72
12
.85
.65
.77
Note that in some instances, even though the pattern is satis-
factory for most applications, the block off is not complete.
As a result, a three-way ST model is ineffective for inducing
room air up a wall or window. DO NOT USE A 3-WAY ST
MODEL TO INDUCE ROOM AIR UP A WALL OR WINDOW.
FIELD INSTALLING BLOW PATTERNS
Acutherm directional baffles are best installed one side at a
time. To do this:
1. Open Therma-Fuser diffuser. ST-C and ST-HC.
a. Open appearance panel. See
Opening the Appearance
Panel
, Pg. 2.
b. Push the balancing lever to the right and up. See
Fig. 3
.
2. Remove the two corner screws that attach the channel
assembly on the side to be blocked off. Make sure you are
blocking off the correct side. The side with the thermostat
should always be blocked first.
3. Slide the Acutherm directional baffle between the channel
bracket and the housing. The slots in the baffles must be
away from the housing and toward the bottom of the dif-
fuser.
4. Replace and tighten the two corner screws.
5. For two-way blow patterns, repeat the above steps for the
second side to be blocked off.
BLOW PATTERNS
Blow Patterns are added by blocking off the air on the appro-
priate sides with Acutherm directional baffles. To increase
capacity and throw from the unblocked sides, the baffles fold
around the diffusion disc. See
Fig. 10
.
Fig. 10 Directional Baffle Location
The rule for blocking the appropriate side is: ALWAYS
INSTALL DIRECTIONAL BAFFLES ON THE THERMAL ELE-
MENT SIDE OF THE THERMA-FUSER DIFFUSER.
See
Fig. 11.
Fig. 11. Correct Sides to Block
THREE WAY BLOW — D3
TWO WAY BLOW, CORNER — D2C
NOTE: a D2C requires two D3 baffles.
Page 5
Directional
Baffle
Appearance
Panel
Damper Disc
D3 Baffle
D3 Baffles
D3 Baffle
D3 Baffle
Continued on next page
