OWNER’S MANUAL
PACKAGED TERMINAL AIR CONDITIONER
Cool / Heat Model
STW-2 Series
Operating Instructions
Contents
Page
Alert Symbols ........................................................... 1
Installation Location ................................................ 2
Electrical Requirements .......................................... 2
Safety Instructions................................................... 2
Names of Parts ......................................................... 2
Control Panel and Operation Functions ................ 2
Front Grille................................................................ 3
Other Features.......................................................... 3
Care and Cleaning.................................................... 4
Tips for Energy Saving............................................ 5
Troubleshooting ....................................................... 5
Installation Instructions
Contents
Model No.
Page
STW-2 Series
IMPORTANT!
Power Source:
Please Read Before Starting................................... 6
1. NAMES OF PARTS............................................. 7
2. WALL CASE AND REAR GRILLE..................... 7
3. INSTALLATION................................................... 7
4. PERMANENT CONNECTION............................. 8
4-1. For 230/208V Units...................................... 8
4-1-1. Preparation ........................................ 8
60 Hz, single-phase, 230/208V & 265V
Alert Sym bols
The follow ing symbols used in this manual alert you to potential-
ly dangerous conditions to users, service personnel or the appli-
ance:
4-1-2. Installation.......................................... 8
4-2. For 265V Units............................................. 8
4-2-1. Preparation ........................................ 8
This sym bol refers to a hazard or
unsafe practice w hich can result in
severe personal injury or death.
WARNING
4-2-2. Installation.......................................... 8
5. AIR LOUVERS.................................................... 9
6. TEMPERATURE LIMITING................................. 9
7. REMOTE CONTROL ........................................ 10
8. FRONT DESK CONTROL ................................ 10
PRODUCT INFORMATION............................... 11
This sym bol refers to a hazard or
unsafe practice w hich can result in
personal injury or product or prop-
erty dam age.
CAUTION
85164119653000
© SANYO 2001
SANYO Electric Co., Ltd.
Osaka, Japan
W
Operation:
Front grille
1. Set the m ode selector for fan, cooling or heating opera-
Louver screws
tion.
2. Set the therm ostat to the desired position. (Refer to the
Setting Tem perature Guide on page 2.)
NOTE
The tem peratures at the Setting Tem perature Guide on
Page 2 are provided for reference only, and m ay differ
from the actual tem perature of the room .
How to stop the air conditioner:
Set the m ode selector to OFF position.
The direction of the heated or cooled air m ay be adjusted
by rem oving and turning the louvers around.
How to restart the air conditioner:
Set the m ode selector to the desired position.
Front Grille
To rem ove:
Additional controls are located behind the front grille.
Pull out to release it from the tabs. Then lift up.
37° OFF VERTICAL
20° OFF VERTICAL
2
Other Features
Front grille
Ventilation Control
The ventilation control lever is located at the upper left
side of the unit, behind the front grille.
1
This knob is set to CLOSE at the factory. When in this
position, the vent door is closed and only indoor air is cir-
culated by the air conditioner. Switching the knob to
OPEN opens the vent door to allow outdoor air to enter
the room . However, leaving the vent door at OPEN
reduces heating or cooling effectiveness and increases
operating costs.
To reinstall:
Place the tabs over the top rail. Push inward until it snaps
into place.
1
2
Air Louvers
Ventilation control lever
To change the louver direction, rem ove the front grille and
2 louver screws that hold the louvers in place. Turn the
louver section 180° (end for end), replace the screws and
replace the front grille. The textured face of the louver
section m ust be facing toward the room side.
Rem ote Control
Rem ote controlling is available with the optional Class 2
Rem ote Controller and Interface kit. See the Installation
Instructions.
3
Fan Cycle Sw itch
Care and Cleaning
Turn off the air conditioner before cleaning.
Air Filters
The air filters should be cleaned at least once every two
weeks. Clogged filters reduce cooling, heating and air
flow.
The Fan Cycle Switch is located under the control panel
behind the front grille. This switch is set to CONT at the
factory to provide continuous fan operation in cool or
heat m odes. Leaving the switch at the CONT setting
allows continuous circulation of room air and will keep
the room tem perature at stable condition. If you want the
fan to cycle on and off with the com pressor or electrical
heater, set the switch to CYCLE.
Keeping these filters clean w ill:
• Decrease cost of operation.
• Save energy.
• Prevent clogged heat exchanger coils.
• Reduce costly com pressor problem s.
THERM
OS
TAT
SELECT
OR
N
OFF
LO
T
HIGH
FA
W
LO
W
HEA
To rem ove the air filters:
COOL
HIGH
COOL
HEA
T
W
ARMER
COOLER
Pull up
2 air filters
Knob
Front
Control panel
THERMOST
AT
SELECT
FAN
OR
To clean the air filters:
• Vacuum off heavy dirt.
OFF
LOW
LOW
COO
HEAT
L
HIGH
HEA
HIG
COO
H
T
L
WA
RM
ER
COOLER
• Run water through the filters.
• Dry thoroughly before replacing.
To reinstall the air filters:
CYCLE
CONT
Push
down
Fan cycle switch
Freeze Protection
Freeze Protection helps prevent plum bing dam age due to
sub-freezing tem peratures — even if you have turned the
m ode selector switch to OFF. The unit autom atically turns
on the heater and fan if the room tem perature falls to
about 46°F.
NOTE
Do not operate the air conditioner without the filters in
place. If a filter becom es torn or dam aged it should be
replaced im m ediately. Operating the unit without the fil-
ters in place or with dam aged filters will allow dirt and
dust to reach the indoor coil and reduce the efficiency of
the unit.
You do not have to do anything to activate the Freeze
Protection. It will work as long as power to the unit has
not been interrupted.
Replacem ent filters (STK01AF) are available from the deal-
er or installer.
Front Grille & Wall Case
Wash the front grille and wall case finish with m ild soap
or detergent and lukewarm water.
4
Control Panel
Troubleshooting
The control panel is shipped with a protective plastic
film . This film can be left on or rem oved. To clean, use a
dam p cloth and m ild detergent.
PROBLEM
POSSIBLE CAUSE
AIR CONDITIONER • The power cord is not plugged in or
DOES NOT
OPERATE
circuit breaker is tripped.
Outdoor Coil
The coil on the outdoor side of the unit should be
checked periodically and cleaned if clogged with dirt or
soot from the atm osphere. If extrem ely dirty, it m ay need
to be professionally steam cleaned.
AIR CONDITIONER • The unit is waiting for the compressor
“DOES NOT COOL
OR HEAT AS IT
SHOULD”
overload protector to reset.
• Curtains, blinds or furniture blocking
the front of the air conditioner are
restricting the air flow.
Base Pan
In som e installations, dirt or other foreign m atter m ay be
blown into the unit from the outside and settle in the
base pan (the bottom of the unit). Check the base pan
periodically and clean it out, if necessary.
• Thermostat control may not be set
high/low enough. Turn the control to a
lower or higher position. (NOTE: In
some installations, the thermostat
control cannot be turned all the way to
the highest end or lowest end. This is
normal. Do not attempt to force the
control beyond its stopping points.)
Tips for Energy Saving
Do not
• A dirty air filter is blocking air flow.
The filter should be cleaned at least
once every 2 weeks. See the instruc-
tions in the cleaning section.
• Block the air intake and outlet of the unit. If they are
obstructed, the unit w ill not w ork w ell, and m ay be
dam aged.
• Let direct sunlight into the room . Use sunshades,
blinds or curtains. If the walls and ceiling of the room
are warm ed by the sun, it will take longer to cool the
room .
• The room m ay have been very hot or
very cold when the air conditioner
was first turned on. Allow tim e for it
to cool down or warm up.
• The ventilation control m ay be set to
the OPEN position, allowing outside
air to enter the room .
Do
• Keep the air filter clean. (Refer to “Care and
Cleaning.”)
• Dust on the surface of the electrical
heater can cause a “burning” odor at
the beginning of the heating opera-
tion. This odor should quickly fade.
“BURNING” ODOR
AT START OF
HEATING
A clogged filter will im pair the perform ance of the unit.
• To prevent conditioned air from escaping, keep win-
dows, doors and any other openings closed.
• Keep the ventilator closed for econom y and m axim um
cooling.
OPERATION
• Relay clicks m ay be heard when the
com pressor or fan cycles on and off.
This is norm al.
OPERATING
SOUNDS
• The fan runs continuously when the
unit is operating unless the Fan Cycle
Switch under the control panel is set
to CYCLE. In this case, the fan cycles
on and off with the electrical heater
or com pressor.
AIR IS NOT
• The Fan Cycle Switch m ay be set to
Fan Cont (continuous). This causes
the fan to blow room air even when
the com pressor is off. The continuous
air flow provides better overall tem-
perature control.
ALWAYS COOL
DURING COOLING
OPERATION
• The Fan Cycle Switch m ay be set to
Fan Cont (continuous). This causes
the fan to blow room air even when
the electrical heater is off. The contin-
uous air flow provides better overall
tem perature control.
AIR IS NOT
ALWAYS HOT
DURING HEATING
OPERATION
5
INSTALLATION INSTRUCTIONS
• DO NOT turn the air conditioner on and off by plugging
and unplugging. Use the Operation switch (SELEC-
TOR).
IMPORTANT!
Please Read Before Starting
• Follow National Electrical Code (NEC) and local codes,
ordinances and regulations. All wiring — including
installation of receptacles, must be in accordance with
these codes.
This air conditioner meets strict safety and operating stan-
dards. As the installer or service person, it is an important
part of your job to install or service the system so it oper-
ates safely and efficiently.
• The NEC requires permanent connection for installa-
tions over 250 volts.
For safe installation and trouble-free operation, you
must:
• Protective devices (fuses or circuit breakers) accept-
able for this air conditioner are specified on the name-
plate of each unit.
•
Carefully read this OWNER’S MANUAL before installa-
tion and service.
• Aluminum building wiring may pose special problems
— consult a qualified electrician.
•
•
•
Follow each installation or service step exactly as shown.
Observe all local, state, and national electrical codes.
When Transporting
Pay close attention to all warning and caution notices
given in this manual.
Be careful when picking up and moving the air conditioner.
Get a partner to help, and bend your knees when lifting to
reduce strain on your back. Sharp edges or thin aluminum
fins on the air conditioner can cut your fingers.
This symbol refers to a hazard or
unsafe practice which can result
in severe personal injury or death.
WARNING
This symbol refers to a hazard or
unsafe practice which can result
When Servicing
CAUTION
in personal injury or product or
property damage.
• Turn the power OFF at the main power box (mains)
before opening the unit to check or repair electrical
parts and wiring.
If Necessary, Get Help
• Keep your fingers and clothing away from any moving parts.
These instructions are all you need for most installation
sites and maintenance conditions. If you require help for a
special problem, contact our sales/service outlet or your
certified dealer for additional instructions.
• Clean up the site after you finish, remembering to
check that no metal scraps or bits of wiring have been
left inside the unit being serviced.
Tools Needed
SPECIAL PRECAUTIONS
When Wiring
Phillips screwdriver
Flat blade screwdriver
Others
ELECTRICAL SHOCK CAN CAUSE SEVERE PERSON-
AL INJURY OR DEATH. ONLY A QUALIFIED, EXPERI-
ENCED ELECTRICIAN SHOULD ATTEMPT TO WIRE
THIS SYSTEM.
CAUTION
• All wiring must conform to local electrical codes.
• Before starting the installation, the power to the direct
connect wiring should be set to OFF.
• Each unit must be properly grounded with a ground (or
earth) wire or through the supply wiring.
• DO NOT, under any circumstances, cut or remove the
third (ground) prong from the power cord plug.
• Ventilate any enclosed areas when installing or testing the
refrigeration system. Escaped refrigerant gas, on contact
with fire or heat, can produce dangerously toxic gas.
• Never use an extension cord with this air conditioner.
• DO NOT use a damaged power cord, plug, or wall out-
let. Replace them immediately.
• Confirm upon completing installation that no refrigerant
gas is leaking. If escaped gas comes in contact with a
stove, gas water heater, electric room heater or other
heat source, it can produce dangerously toxic gas.
• DO NOT change the internal wiring or any part of the
system.
6
1. NAMES OF PARTS
3. INSTALLATION
1) Rem ove the front grille by pulling out at the bot-
tom to release it, then lift it up to clear the rail
along the chassis top.
Rear grille/louver**
Wall case**
Front grille*
Chassis
2
1
* Shipped with the chassis
** Check essential components list on chassis
2) Slide the chassis into the wall case and secure
with four screws through the chassis flange
holes.
2. WALL CASE AND REAR GRILLE
1) The STK01WC wall case m ust be properly
installed according to the instructions packed with
the case.
Wall
2) Rem ove the corrugated stiffener and the outdoor
protective panel. Use the slit in the outdoor panel
as a grip and push out.
3) Install the rear grille from the room side according
to the instructions packed with the grille.
Slit
Protective panel
Wall case
3) Reinstall the front grille by hooking the top over
the rail along the chassis top, then pushing it in
at the bottom .
Stiffener
1
2
7
4. PERMANENT CONNECTION
Screw A
4-1. For 230/ 208V Units
Electrical
junction box
The 230/208V m odel is equipped for connection
with a power cord according to the unit capacity
at the tim e of shipm ent.
Power cord
Should local codes or special requirem ents speci-
fy perm anent connection of this unit, use optional
adapter kit (Cover plate and Bottom plate)
STK02J B.
Screw B
Bottom plate
A power cord is supplied with 230/208V units. For
direct-connect applications, the power cord is cut
and a wire nut connection is m ade to the building
power supply. The cover plate and bottom plate
are the junction box kit. The conduit and wire
nuts are supplied by the installer.
Conduit
Cover plate
4-1-1. Preparation
4-2. For 265V Units
1) The electrical rating m arked on the previously
installed air conditioner m ust be the sam e as the
supply branch circuit.
All 265V units are direct connected and com e
with the cover plate (junction box) and bottom
plate. The conduit is field-supplied by the
installer.
2) The m odification kit provides for connection of
1/2" trade size electrical conduit and connection to
a wiring system in accordance with the National
Electric Code, ANSI/NFPA No. 70-1999.
4-2-1. Preparation
1) The electrical rating m arked on the previously
installed air conditioner m ust be the sam e as the
supply branch circuit.
4-1-2. Installation
1) Rem ove the Front Grille from the chassis by lift-
ing out and up.
2) The unit provides for connection of 1/2 trade size
electrical conduit and provision for connection to
a wiring system in accordance with the National
Electrical Code ANSI/NFPA No. 70-1993.
2) Cut the power cord approxim ately 6" from the
Electrical J unction Box.
4-2-2. Installation
Cut
1) Remove the front grille from the chassis by lifting
out and up to clear mounting brackets. (See “Front
Grille” on page 3.)
Approx. 6"
2) Rem ove the “A” screw and cover plate from the
m ounting plate.
Power plug
Electrical junction box
Screw A
3) Split and strip the wires as shown above.
4) Install the Bottom Plate using the provided field
supplied conduit and power supply conductors to
the unit with screw “B”.
Screws
5) Connect Power Supply wires to the stripped inner
wires with the wire nuts.
6) Dress the wiring inside the com partm ent and
attach the cover plate with screw “A”.
7) Reinstall the Front Grille.
Cover plate
Bottom plate
8
3) Attach the field-supplied conduit to the
bottom plate.
6. TEMPERATURE LIMITING
The norm al range of the therm ostat control is
approxim ately 55°F to 88°F. The control range m ay
be narrowed by the use of the Tem perature Lim iting
screws located behind the control panel.
4) Connect the power supply conductors to
the Term inal block and the Grounding
screw.
5) Attach the cover plate.
Repositioning the screw on the left will lim it the
m axim um tem perature about 3.7°F for each hole in
a clockwise rotation; the screw on the right will lim it
the m inim um tem perature when m oved counter-
clockwise. Lim iting the m axim um and m inim um set-
tings prevents users from turning the controls to
extrem e positions. Restrictions to full rotation of the
therm ostat knob m ay require explanation to the
room occupant that the unit will provide com fort-
able conditions at the settings allowed.
Terminal block
Grounding screw
Cover plate
Bottom plate
Conduit
To access the lim iting screws, rem ove the front
grille, the therm ostat knob and the operation knob
by pulling each knob off its shaft and the control
panel. (See the illustration “Fan Cycle Switch” on
page 4.) Set the lim iting screws to the desired set-
ting, and replace the control panel and the control
knobs. If the settings do not allow sufficient room
tem perature control, the lim iting screws m ay have
to be repositioned.
6) Reinstall the front grille. (See “Front
Grille” on page 3.)
Stop link
Tapped holes (10)
5. AIR LOUVERS
The direction of the heated or cooled air m ay be
adjusted by rem oving and turning the louvers
around.
Thermostat
shaft
(Warmest)
(Coldest)
Temperature limiting screws (location at shipment)
When the lim iting screws are relocated, it is recom -
m ended that the screws be set no higher than the
second hole from the original bottom position. This
provides an operating range between approxim ately
58°F and 80°F. In order to m axim ize the benefit of the
tem perature lim iting, it m ay be necessary to adjust
the lim iting screws seasonally, m aintained at m oder-
ate tem peratures (i.e., heating season tem peratures
lim ited between 60°F and 75°F; cooling season tem -
peratures lim ited between 85°F and 65°F).
To change the louver direction, rem ove the front
grille and 2 louver screws that hold the louvers in
place. Turn the louver section 180° (end for end),
replace the screws and replace the front grille. The
textured face of the louver section m ust be facing
toward the room side.
Front grille
Louver screws
9
7. REMOTE CONTROL
8. FRONT DESK CONTROL
The unit m ay be controlled either by the unit-m ount-
ed controls (Control Panel) or by optional Class 2 ther-
m o controller (SC2001 for Cool/Heat Model and
SC2201 for Heat Pum p Model) with optional Interface
kit (STK02LVC). Detailed instructions are included in
the kit.
The unit m ay be connected to a switch at the front
desk to control on and off operation of the com pres-
sor or heater from the front desk with the optional
interface kit. (See the picture below.) When the switch
is set to OPEN, the unit is operable. When the switch
is set to CLOSED, the unit is m ade inoperative.
Detailed hook-up instructions are in the interface kit.
Follow the recom m ended wire sizing in the table
below. Two wires m ust be used from each FDC switch
to each individual unit.
FDC
Class 2 Remote
Good wiring practices (e.g. twisted pairs, SEPARA-
TION FROM POWER CIRCUITS) m ust be followed to
m inim ize induced voltages which m ay harm the con-
trol system . Do not use a com m on line in the FDC
wiring.
Low voltage
Terminals on Interface kit
A 24V A/C transform er is contained within the unit
and no external voltage should be applied to the unit
through the FDC switch. The Freeze Protection
rem ains in active m ode to help protect against low
tem perature dam age even though the unit m ay be
OFF by FDC.
Recom m ended Wire Size for Front Desk Control
Installation
Wire Size #AWG
Maxim um Allow able Length
#22
#20
#18
#16
600 ft.
900 ft.
1500 ft.
2000 ft.
Interface kit
(optional)
Terminals
10
Product Inform ation
If you have problem s or questions concerning your Air Conditioner, you will need the following inform ation.
Model and serial num bers are on the nam eplate of the cabinet.
Model No.
Serial No.
Date of purchase
Dealer’s address
Phone num ber
11
SANYO FISHER COMPANY
In Canada
A DIVISION OF SANYO NORTH AMERICA CORPORATION
21605 plummer Street, Chatsworth, CA 91311 U.S.A.
SANYO Canada Inc.
300 Applewood Crescent, Concord, Ontario, L4K 5C7, Canada
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