ADJUSTING TEMPERATURE
SETPOINTS (TK-HC, TK-C)
The TK-HC Therma-Fuser diffuser is factory set for
74° F/28°C for both heating and cooling. Because heat
loads in various rooms differ and individual occupants
prefer different temperatures, it is recommended that the
thermostats should not be adjusted until after a few days of
operation.
Room temperature set points are adjusted by screwing
the thermostats in or out – in for cooler or out for warmer.
Determine the set point by aligning the white indicator with
the °F or °C numbers on the temperature scale (See
Fig. 6
).
The thermostats may be slightly harder to screw in or out
when warm because the shaft is extended, putting more
pressure on the thermostat. If you are unable to turn the
thermostat in this situation, cool the thermostat by holding
an ice cube to the large end. The shaft will then contract and
the thermostat will turn easily for adjustment.
BLOW PATTERNS (TK-HC, TK-C, TK-D)
A major selling feature of the TK-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
1-1/8”/ 28.575mm diameter x 5-5/8”/143mm long
insulation (Armaflex) for 3/8”/ 9.525mm refrigeration
lines. Insert between the housing and the diffusion
plate/blade assembly and wedge between the standoffs
(See Fig. 7). Take care to clear the damper hinges so
that the damper operates freely.
The rule for blocking the appropriate side is:
Always block
the side adjacent to the thermost.
(See
Fig. 8
for examples.)
When blocking for direction, reduce maximum air volume
for a given static pressure and throw in the performance
guide by:
Blow Patterns
Reduction
3 way (D3)
.80
2 way opposite (D2)
.64
2 way corner (D2C)
.59
1 way (D1)
.45
Fig 7. Field installed foam baffle
Page 3 of 6
Fig 6. Room temperature set point adjustment
RECOMMENDED ADJUSTMENTS FOR
VARIOUS CONDITIONS
Thermostats
Read setpoints here
Adjust cooling for higher room temperature set point.
(Screw cooling thermostat out.)
Therma-Fuser diffuser is correct. Check if cooling is
still required, and if not, turn cooling unit off.
Therma-Fuser diffuser is correct. Check for lack of
air or for too warm air temperature.
Adjust cooling thermostat for lower room tempera-
ture set point. (Screw cooling thermostat in.)
Therma-Fuser diffuser is correct. Check for lack of
air or too low air temperature.
Adjust heating thermostat for higher room tempera-
ture set point. (Screw heating thermostat out.)
Adjust heating thermostat for lower room tempera-
ture set point. (Screw heating thermostat in.)
Therma-Fuser diffuser is correct. Check if heating is
still required, and if not, turn it off.
Reduce static pressure. Recommended static pres-
sure is .05 to .25 wg / 10 to 60 Pa at the inlet of the
diffuser. If lower noise level does not result from
lower static pressure, check for and correct noise
generating restrictions in the duct up stream such as
large pressure drops over dampers, heaters, etc.
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Any
Too
Cold
Too
Warm
Too
Cold
Too
Warm
Any
Cooling
Mode
TK-HC
Heating
Mode
TK-HC
Too
Noisy
TK-HC
TK-D
Room
Temp.
Blade
Position
Recommended
Action
THERMA-FUSER
DIFFUSER
Diffusion
Damper
Housing
Probe
Appearance
Panel
Gauge
1250 to
2300 fpm
Figure 7 @ 200%
Figure 3 @200%
