Adjusting Temperature Setpoints; Blow Patterns - Price Acutherm THERMA-FUSER SYSTEMS Installation & Operation Manual

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
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.
Read setpoints here
Fig 6. Room temperature set point adjustment
RECOMMENDED ADJUSTMENTS FOR
VARIOUS CONDITIONS
Room Blade
Temp. Position
Cooling Too Open Adjust cooling for higher room temperature set point.
Mode Cold (Screw cooling thermostat out.)
Closed Therma-Fuser diffuser is correct. Check if cooling is
still required, and if not, turn cooling unit off.
Too Open Therma-Fuser diffuser is correct. Check for lack of
Warm air or for too warm air temperature.
TK-HC
Closed Adjust cooling thermostat for lower room tempera-
ture set point. (Screw cooling thermostat in.)
Heating Too Open Therma-Fuser diffuser is correct. Check for lack of
Mode Cold air or too low air temperature.
Closed Adjust heating thermostat for higher room tempera-
ture set point. (Screw heating thermostat out.)
TK-HC Too Open Adjust heating thermostat for lower room tempera-
Warm ture set point. (Screw heating thermostat in.)
Closed Therma-Fuser diffuser is correct. Check if heating is
still required, and if not, turn it off.
Too Any Any Reduce static pressure. Recommended static pres-
Noisy 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
TK-HC generating restrictions in the duct up stream such as
TK-D large pressure drops over dampers, heaters, etc.
Fig. 6).
Figure 3 @200%
Thermostats
Appearance
Panel
Gauge
1250 to
2300 fpm
Recommended
Action
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
When blocking for direction, reduce maximum air volume
Diffusion
for a given static pressure and throw in the performance
Damper
guide by:
Housing

Blow Patterns

3 way (D3)
2 way opposite (D2)
2 way corner (D2C)
1 way (D1)
Probe
Fig 7. Field installed foam baffle
Figure 7 @ 200%
for examples.)
Fig. 8
Reduction
.80
.64
.59
.45
THERMA-FUSER
DIFFUSER
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