Page 4
5. Changeover close rod position—inward or outward. See
Fig. 8
.
Fig. 8 Changeover Rod
6. Cooling and heating setpoints. See
Fig 6
.
7. Room thermostat position measured to the inside edge of
the induction air inlet. See
Fig. 9
.
Fig. 9 Measure Thermostat Position
8. Min. flow stop setting—percent flow. See
Fig. 5
.
9. Balancing lever position—open or closed. See Fig. 3.
10. 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?
TROUBLE SHOOTING
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 over-
looked. Before calling Acutherm, please complete the data
log for all Therma-Fuser diffusers to be evaluated.
SYSTEM CHECK
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 (Conditions may vary over time; several
measurements at different times may be required):
1. Room temperature 4ft / 1.2m above the floor directly
under the Therma-Fuser diffuser.
2. Supply air temperature at the inlet of the Therma-Fuser
diffuser.
3. Static pressure at the inlet of the Therma-Fuser diffuser.
4. Damper disc opening from the edge of the disc, meas-
ured vertically to the housing. See
Fig. 7
.
Fig. 7 Measure Disc Opening
LOCATION
DATE
TIME
ROOM
TEMP
S.A.
TEMP
DUCT
S.P.
DISC
OPENING
CHANGEOVER
CLOSE ROD
POSITION
SET POINTS
Cooling Heating
ROOM
THERMOSTAT
POSITION
MIN. FLOW
STOP
SETTING
BALANCE
LEVER
POSITION
LOCATION
BY WALL
ETC?
TROUBLE SHOOTING DATA LOG
Housing
Small
Steel Rule
Damper
Disc
21
23 25
21
23 25
°
C
78
74
70
74
°
F
70
Rod outward
Rod inward
21
23 25
21
23 25
°
C
78
74
70
74
°
F
70
Measure with
a small steel rule
