Advertisement
Quick Links
AAF@
OPERATION AND
MAINTENANCE
DATA
~
MODEL AV FLOOR MOUNTED
MODEL AH CEILING MOUNTED
SPLIT SYSTEM ASHP UNIT VENTILATOR
100% OUTDOOR
AIR MODEL
WHAT IS A UNIT VENTILATOR?
Your unit ventilator can be classified as a kind of classroom
"thermal
handy man." Unit ventilators maintain a clean, com-
fortable, healthy environment
automatically.
They heat, ven-
tilate
and
provide
natural
cooling
(with outdoor
air) or
mechanical
cooling.*
Your room temperature
should be neither too hot nor too
cold. The unit ventilator provides just the right amount of pro-
perly conditioned
air to meet the needs of various types of
activity throughout
the day.
If the air being discharged
by the unit feels cold to your
hand, it is because the room needs this cooling effect to pre-
vent overheating.
Please observe these simple rules to
assure efficient operation of your unit
ventilator.
1.
Keep doors and windows closed to allow the unit to
function
properly.
2. DO NOT attempt to adjust the unit thermostat.
Ask
the custodian
or other authorized
person to make
adjustments
if needed.
*Refrigeration
cooling is used instead of outdoor air during
warm weather.
HOW YOUR UNIT VENTILATOR
WORKS
,,
,
Q
3
6
SOMETIMES
YOUR
UNIT
VENTILATOR
WILL
BE
SENDING
HEATED ROOM AIR INTO YOUR CLASS-
ROOM
USUALLY
THIS OCCURS
BEFORE
OCCU-
PANCY
,2
9
693
6
SOMETIMES
YOUR
UNIT
VENTILATOR
WILL
BE
SENDING
A MIXTURE
OF ROOM AIR AND FRESH
OUTDOOR
AIR
INTO YOUR
CLASSROOM
THIS
USUALLY
OCCURS
INTERMITTENTLY
ALL
DAY
LONG
,2
,
8
6
"SOMETIMES
YOUR
UNIT VENTILATOR
WILL BE
SENDING ONLY FRESH, OUTDOOR
AIR INTO YOUR
CLASSROOM
TO COOL
THE ROOM,
COUNTER-
ACTING
THE HEAT GENERATED
BY THE PUPILS,
LIGHTS AND SUN THIS ALSO MAY OCCUR INTER-
MITTENTLY
ALL DAY LONG
OPERATION
GENERAL — The model AV and AH ASHP features a split
system refrigeration system to provide both heating and cool-
ing. The unit is also capable
of providing
free cooling
by
automatically delivering
up to 100% outdoor air. Please read
this bulletin carefully. It is important
to understand
how the
unit operates. A properly maintained unit should provide years
of troublefree
service.
UNIT OPERATION — Place the main power "on-off"
switch,
accessible behind the center front access panel (see Figure
1), in the "On" position. This switch should remain in the "On"
position except when servicing the unit or when the unit is
to be shut down for an extended
period,
ROOM AIR FANS — The room air fans will run continuously
during the occupied
period. During the unoccupied
period
(night setback), the fans will run only on a call for heat or cool-
ing. NOTE: When the unit is not furnished
with any type of
night setback
arrangement,
the fan will run continuously
unless the unit is manually
turned off.
COOLING — Mechanical
cooling is provided by a conven-
tional sealed refrigeration system whereby heat from the room
is absorbed by the refrigerant in the indoor coil and, through
the action of the compressor, is transferred to the outdoor coil.
The unit is capable of bringing
in up to 100% outside air to
cool the room. Therefore,
the refrigeration
system only
operates during those periods when the outside temperature
is too warm to cool the room.
HEATING — The refrigeration
system includes a "reversing
valve" which can reverse the operation
of the refrigeration
system so that heat from the outside air is absorbed
by the
refrigerant
in the outdoor coil and transferred
to the indoor
coil where it is used to heat the room. This is "Reverse-Cycle
Refrigeration"
or "Heat Pump"
mode of operation.
0
1991
SnyderGeneral Corporation
Advertisement
