2
Low ambient lockout
locks out com-
pressor at ambient temperatures below
40 F to extend compressor life.
Random restart
is used when power
is turned on after a power outage. A
built-in random restart (3 to 4 minutes)
prevents all the compressors from re-
starting simultaneously.
Compressor restart delay
of 3 min-
utes ensures that system pressures are
allowed to equalize before a compres-
sor restart, which extends compressor
life.
Front desk control
allows the user,
when the unit is wired to a front desk
console, to enable or disable each unit
from the front desk, thus saving the en-
ergy used to condition unoccupied
rooms.
Fan delay
allows the evaporator blow-
er to continue running for up to
45 seconds after the thermostat is sat-
isfied. This feature maximizes cooling
performance.
Ease of service
A service pullout is factory installed for
service convenience and maintenance.
Filter brackets and throwaway filter
are shipped with each unit and are field
installed over the unit’s evaporator
coil. Filter size is 18 x 24 x 1-inch.
Adjustable operation
An adjustable fresh air (manual) damp-
er can be used to meet code require-
ments for fresh air introduction. When
opened, the fresh air vent allows up to
50 cfm of outside air to be introduced
into the equipment closet. The air then
mixes with return air entering the clos-
et through the return-air grille. See Ap-
plication Data section for more
information.
Thermostat control
The 52V unit is easily controlled by a
standard low voltage wall-mounted
thermostat instead of complicated unit-
mounted controls. Low voltage wires
are routed out the left side of the
cabinet.
Easy installation
Rear or side installation wall sleeves
are provided for pre-installation. When
ready, the 52V unit is simply slid into
the sleeve and the ductwork and elec-
trical are connected.
The sleeve is weight-bearing and sup-
ports the entire weight of the 52V unit.
The sleeve provides a weather tight
seal against wind and water infiltration.
A
3
/
4
-in. male NPT fitting is provided
in the bottom of the sleeve for field
connection to a condensate riser.
Four wall sleeve depths are available
to accommodate wall thickness from 5
to 20 inches. Each sleeve includes a
factory-installed weather guard to
cover the sleeve opening during
construction.
Unique sleeve drain conden-
sate system
A factory-installed drain line connects
the evaporator drain pan to a vertical
pipe connection in the 52V basepan.
Evaporator condensate is delivered
from the unit to a catch tray in the wall
sleeve and exits the sleeve through the
3
/
4
-in. male NPT fitting.
This design allows the plumber to
completely pipe the drain to a conden-
sate riser during the pre-installation
stage, thus decreasing the likelihood of
condensate connection problems usu-
ally encountered when trying to con-
nect the HVAC (heating, ventilation,
and air conditioning) condensate drain
to the riser after the HVAC unit is in-
stalled in the closet.
This feature also allows the 52V unit
to be removed for service without
disconnecting the condensate piping.
This configuration does not require any
additional closet space to make the
drain connection, as do some competi-
tive products.
Redundant systems
If for any reason the primary conden-
sate riser becomes clogged, water will
fill the catch tray and then be diverted
through the sleeve to the exterior of
the building, in a secondary system,
rather than be allowed to overflow into
the closet or living area. Rain water en-
tering the sleeve is automatically divert-
ed to the building exterior as well.
Return air options
Ductable return air tabs are provided
on the inlet of the evaporator coil to
permit the connection of return air
ductwork if required by local codes.
Please note that most installations
would not normally require ducted re-
turn air.
Attractive appearance
The new flush-style architectural louver
is an attractive extruded aluminum ar-
chitectural louver that attaches to the
outside face of the wall sleeve. The
blades of the grille recess into the wall
sleeve for a neat, flush appearance.
Louvers install from the inside of the
wall sleeve. The 52V unit should not
be installed into the sleeve before in-
stalling the louver.
Features/Benefits (cont)
Table of contents
Page
Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Capacity Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4,5
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Field-Installed Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7,8
Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11,12
Typical Wiring Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14,15
Typical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18,19
