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VARITHERM SMALL SQUARE VAV DIFFUSER
TROUBLE SHOOTING (VKD-HC, VKD-C)
Trouble shooting Varitherm Small Square VAV diffusers requires looking at the system as a whole. Before examining the Varitherm
Small Square VAV diffuser for failure it is worth the time to be sure the system is functioning properly and that something has not
been overlooked.
System Check List
The system should be:
1.
Delivering 50°- 68°F/10° - 20°C supply air when in
thecooling mode.
2.
Delivering 80°-120°F/26.5° – 49°C supply air when inthe
heating mode.
Varitherm Small Square VAV Diffuser Check List
Once the above checks have been completed, examine and record the following (temperature may vary over time; several
measurements at different times may be required):
1.
Room temperature 4 feet above the floor directly underthe
Varitherm Small Square VAV diffuser.
2.
Supply air temperature at the Varitherm Small Square VAV
diffuser.
3.
Static pressure at the inlet of the Varitherm Small Square
VAV diffuser.
4.
Blade opening from the edge of the blade,
measuredperpendicular to the housing.
5.
Thermostat slider position.
6.
Cooling and heating setpoints.
7.
Damper opening cam—positioned for blades fullyclosed,
partially open or fully open.
8.
Is the Varitherm Small Square VAV diffuser located
within2ft/600mm of a vertical protrusion such as a wallor
dropped beam which could disturb induction airflow?
9.
Is the Varitherm Small Square VAV diffuser located within
2ft / 600mm of a vertical protrusion such as a wall or
dropped beam which could disturb induction air flow?
8
VARITHERM SMALL SQUARE VAV DIFFUSER - Manual | priceindustries.com/vavdiffusers
TROUBLE SHOOTING (TK-HC, TK-C)
Trouble shooting Therma-Fuser diffusers requires looking at
the system as a whole. Before examining the Therma-Fuser
diffuser for failure it is worth the time to be sure the system
is functioning properly and that something has not been
overlooked. Before calling Acutherm, please complete the
data log for all Therma-Fuser diffusers to be evaluated.
SYSTEM CHECK LIST
The system should be:
1.
Delivering 50°- 68°F/10° - 20°C supply air when in the
cooling mode.
2. Delivering 80°-120°F/26.5° – 49°C supply air when in
the heating mode.
3. Maintaining static pressure at the inlet to each Therma-
Fuser diffuser between .05" and .25"wg/12 Pa and 62 Pa.
4. Maintaining continuous fan operation during occupied
hours.
THERMA-FUSER DIFFUSER CHECK LIST
Once the above checks have been completed, examine
and record the following (temperature may vary over time;
several measurements at different times may be required):
1.
Room temperature 4 feet above the floor directly under
the Therma-Fuser diffuser.
2. Supply air temperature at the Therma-Fuser diffuser.
3. Static pressure at the inlet of the Therma-Fuser diffuser.
Measure from induction housing
to edge of slider.
Cooling mode < 7/8 in / 22 mm
Heating mode > 1 in / 25 mm
Read setpoints here
TROUBLE SHOOTING DATA LOG
Location
Date
3.
Maintaining static pressure at the inlet to each Varitherm
Small Square VAV diffuser between .05" and .25"wg/12 Pa
and 62 Pa.
TROUBLE SHOOTING (TK-HC, TK-C)
Trouble shooting Therma-Fuser diffusers requires looking at
4.
Maintaining continuous fan operation during occupied
the system as a whole. Before examining the Therma-Fuser
diffuser for failure it is worth the time to be sure the system
hours.
is functioning properly and that something has not been
overlooked. Before calling Acutherm, please complete the
data log for all Therma-Fuser diffusers to be evaluated.
SYSTEM CHECK LIST
The system should be:
1.
Delivering 50°- 68°F/10° - 20°C supply air when in the
cooling mode.
2. Delivering 80°-120°F/26.5° – 49°C supply air when in
the heating mode.
3. Maintaining static pressure at the inlet to each Therma-
POINT 4
4. Blade opening from the edge of the blade, measured
Fuser diffuser between .05" and .25"wg/12 Pa and 62 Pa.
perpendicular to the housing.
4. Maintaining continuous fan operation during occupied
hours.
Foam
THERMA-FUSER DIFFUSER CHECK LIST
Once the above checks have been completed, examine
and record the following (temperature may vary over time;
several measurements at different times may be required):
1.
Room temperature 4 feet above the floor directly under
the Therma-Fuser diffuser.
2. Supply air temperature at the Therma-Fuser diffuser.
3. Static pressure at the inlet of the Therma-Fuser diffuser.
5. Thermostat slider position.
POINT 5
Measure from induction housing
to edge of slider.
Cooling mode < 7/8 in / 22 mm
Heating mode > 1 in / 25 mm
6. Cooling and heating setpoints.
Thermostats
7.
Damper opening cam—positioned for blades fully
closed, partially open or fully open.
Read setpoints here
8. Is the Therma-Fuser diffuser located within
2ft/600mm of a vertical protrusion such as a wall
or dropped beam which could disturb induction air
VKD-HC DIFFUSER APPEARANCE PANEL REMOVED
flow?
Time
Room
S.A.
Duct
Blade
T-stat
Set Points
Temp
Temp
S.P.
Opening
Slider
Heating Cooling
TROUBLE SHOOTING DATA LOG
Location
Date
Housing
4. Blade opening from the edge of the blade, measured
perpendicular to the housing.
Blade
Foam
Small Steel Rule
TK-HC THERMA-FUSER diffuser
5. Thermostat slider position.
APPEARANCE PANEL REMOVED
6. Cooling and heating setpoints.
Thermostats
7.
Damper opening cam—positioned for blades fully
closed, partially open or fully open.
8. Is the Therma-Fuser diffuser located within
2ft/600mm of a vertical protrusion such as a wall
or dropped beam which could disturb induction air
flow?
Damper
Opening
Cam
Position
Time
Room
S.A.
Duct
Blade
T-stat
Dam
Set Points
Temp
Temp
S.P.
Opening
Slider
Open
Posi
Heating Cooling
Housing
Blade
Small Steel Rule
TK-HC THERMA-FUSER diffuser
APPEARANCE PANEL REMOVED
Page 5 o
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Ca
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