Movincool OFFICE PRO 12 User manual

SERVICE MANUAL
OFFICE PRO 12

© 1998 DENSO SALES CALIFORNIA, INC.
All rights reserved. This book may not be reproduced or copied, in whole or in part, without
the written permission of the publisher. DENSO SALES CALIFORNIA, INC. reserves the right
to make changes without prior notice.

i
FOREWORD
This manual has been published to service the MovinCool Office Pro 12. Please use this service manual only
when servicing the Office Pro 12.
DEFINITION OF TERMS
WARNING: Describes precautions that should be observed in order to prevent injury to the user during
installation or unit operation.
CAUTION: Describes precautions that should be observed in order to prevent damage to the unit or its
components, which may occur during installation or unit operation if sufficient care is not taken.
NOTE: Provides additional information that facilitates installation or unit operation.
GENERAL PRECAUTIONS
WARNINGS:
• All electrical work if necessary, should only be performed by qualified electrical personnel. Repair to
electrical components by non-certified technicians may result in personal injury and/or damage to
the unit. All electrical components replaced must be genuine MovinCool, purchased from an autho-
rized reseller.
• When handling refrigerant, always wear proper eye protection and do not allow the refrigerant to
come in contact with your skin.
• Do not expose refrigerant to an open flame.
• The proper electrical outlet for MovinCool units must be equipped with a “UL” approved ground-fault
breaker to prevent electrical shock from the unit.
• When brazing any tubing, always wear eye protection and work only in a well ventilated area.

ii

GENERAL DESCRIPTION
1
CONDENSER
(OUTDOOR UNIT)
EVAPORATOR
(INDOOR UNIT)
Conventional Air Conditioner
Office Pro 12
Generally speaking conventional air conditioners cool
the entire enclosed environment. They act as “heat
exchangers”, requiring an interior unit (evaporator) to
blow cool air into the interior and an exterior unit
(condenser) to exhaust exchanged heat to the
outdoors. Unlike conventional air conditioners, the
MovinCool Spot Cooling System is a spot cooler
which directs cool air to particular areas or objects.
MovinCool Spot Cooling Systems have the following
features:
1. Compact Design
The innovative design of MovinCool has resulted
in one compact unit, replacing the need for two
separate units.
2. Easy Transportation and Installation
With the whole cooling system built into one
compact unit, MovinCool requires no piping and
can be easily transported and installed.
3. Energy Conservation
MovinCool is economical because it cools only
the area or objects which need to be cooled.

GENERAL DESCRIPTION
2

CONSTRUCTION AND SPECIFICATIONS
3
ø11.575
20.67
27.40
2.204.60
12.40
43.90
3.80
18.5011.30 7.50 21.20
2.40
16.50
19.30
Exterior Dimensions (units: inches)

CONSTRUCTION AND SPECIFICATIONS
4
1.Basic Construction
The MovinCool Spot Cooling System is compact
in construction because the condenser and the
evaporator are enclosed in one unit. The interior
is divided into three sections. The upper front
face is equipped with the evaporator, while the
lower front face contains the drain tank. The rear
section contains the condenser, the compressor
and the control box.
2.Air Flow
Air drawn from the right side face passes through
the condenser which extracts the heat. This hot
air is blown out through the upper exhaust air
duct. Air taken in from the front face is cooled by
the evaporator and then blown through the cool
air vent. All the air inlets are equipped with filters,
while the exhaust air duct is protected by wire
mesh.
3.Compressor and Fans
The compressor is hermetically sealed. Atwo-
speed fan motor is used with two centrifugal fans
to draw air across the evaporator and condenser.
4.Drain Tank
The capacity of the drain tank is 5.0 gallons (19
liters). The unit is equipped with a full tank LED
and a device to automatically stop the unit’s
operation when the drain tank reaches a level of
approximately 4.0 gallons (15 liters).
COOL
AIR OUT
EVAPORATOR
AIR IN
EXHAUST
AIR OUT
CONDENSER
AIR IN

CONSTRUCTION AND SPECIFICATIONS
5
Specifications Specifications are subject to change without notice.
Rating Conditions
dry bulb .................................................................80 oF (26.6 o
C)
wet bulb ................................................................ 67 oF (19.4 o C)
humidity.................................................................(50%)
Specifications
power frequency ................................................... 60Hz
line voltage ............................................................single phase 115 V
power consumption .............................................. 1.23 Kw
current consumption .............................................10.7 Amps
power factor ..........................................................95%
starting current ......................................................32A
power wiring ..........................................................14 (3-core) AWG
Cooling Unit
cooling capability ..................................................2,870 Kcal/hr
..............................................................................11,480 BTU/hr
cooling system ...................................................... direct expansion
Blower
type of fan ............................................................. centrifugal fan
air volume: .............................................................Evaporator (Hi speed) 441 ft 3/min
..............................................................................Condenser (Hi speed) 823 ft 3/min
motor output ......................................................... 0.14 Kw (Hi)
..............................................................................0.08 Kw (Lo)
Compressor
type ....................................................................... rotary
output ....................................................................0.8 Kw
refrigerant type ......................................................R-22
refrigerant capacity ...............................................0.95 lbs (0.43 kg)
Safety Devices
compressor overload relay ....................................included
fan motor protector ............................................... included
anti-freezing thermister ......................................... included
full drain tank switch.............................................. included
power interruption feature ..................................... included
time delay feature ..................................................included
Dimensions & Weight
W x D x H in. (mm).................................................21.2" x 27.4" x 44" (539 x 696 x 1118)
weight lbs. (kg) ......................................................
165 (75)
Operating Conditions
inlet air (relative humidity) ...................................... 95 oF (35 oC), < 50%
..............................................................................65 oF (18.3 oC), > 50%
Control Device
temperature control .............................................. included
programmable timer ..............................................included
two speed fan........................................................included

CONSTRUCTION AND SPECIFICATIONS
6
EXHAUST AIR VENT
COOL AIR VENT
EVAPORATOR
CAPILLARY TUBE
DRAIN TANK
DRAIN SWITCH
CONTROL BOX
COMPRESSOR
CONDENSER
CENTRIFUGAL FAN
Construction of Office Pro 12

CONSTRUCTION AND SPECIFICATIONS
7
ACCUMULATOR
CONDENSER FAN
FAN MOTOR
SIDE PANEL
RIGHT HANDLE
EXHAUST AIR VENT
CONDENSER
POWER CORD
CAPILLARY TUBE
COMPRESSOR
DRAIN TANK
EVAPORATOR
FRONT PANEL
COOL AIR VENT
CASTER
CONTROL PANEL
EVAPORATOR FAN
TOP PANEL
Construction Diagram

CONSTRUCTION AND SPECIFICATIONS
8
@ 115V
40 50 60 70
Relative Humidity of Inlet Air (%)
6 (10.8)
8 (14.4)
10 (18.0)
12 (21.6)
14 (25.2)
Temperature °C (°F)
Cool Air Temperature Difference Curve
10
(50)
15
(59)
20
(68)
25
(77)
15 (59)
20 (68)
25 (77)
30 (86)
35 (95)
Wet Bulb Temperature °C (°F)
Dry Bulb Temperature °C (°F)
2.0 (7.9)
2.4 (9.5)
2.8 (11.1)
3.2 (12.7)
3.6 (14.3)
Cooling Capability
(x10
3
kcal/h (BTU/h))
@ 115V
Cooling Capability Curve
15
(59)
20
(68)
25
(77)
30
(86)
15 (59)
20 (68)
25 (77)
30 (86)
35 (95)
Wet Bulb Temperature °C (°F)
Dry Bulb Temperature °C (°F) Power Consumption (kW)
0.8
1.0
1.2
1.4
1.6 @ 115V
Power Consumption Curve

REFRIGERANT SYSTEM
9
REFRIGERANT
FLOW
COMPRESSOR
ACCUMULATOR
EVAPORATOR
FAN
MOTOR
CONDENSER
CAPILLARY
TUBE
COMPRESSOR
ACCUMULATOR
EVAPORATOR
CONDENSER
CAPILLARY
TUBE
Refrigerant System
1.The component parts of the re frigerant system include the following:
• Compressor • Evaporator
• Condenser • Accumulator
• Capillary tube
These parts are all connected by copper piping. All the connections have been brazed.

REFRIGERANT SYSTEM
10
Compressor Operation
2.Compressor
The compressor used for the unit is hermetically
sealed. The compressor and the compressor
motor are in one casing.
A.Compressor Construction
The construction of a rotary type compressor
is divided into two mechanisms. The drive
mechanism (compressor motor) and the
compression mechanism (compressor).
When the rotor shaft of the motor (drive
mechanism) turns, the roller of the compres-
sor (compression mechanism) rotates to
compress the refrigerant.
B.Basic Compressor Operation
The roller (compression mechanism) is set
eccentrically with a certain distance given
from the axis of the center of the cylinder. A
spring loaded blade is mounted on the
cylinder. The roller turns to compress the
refrigerant in the space between the cylinder
and eccentrically mounted roller.
The blade is in contact with the roller by
means of spring force. It partitions the space
between the suction side and the discharge
side to keep compressed refrigerant from
returning to the suction side.
There is no suction valve. The discharge
valve is designed not to open until the
pressure of the refrigerant within the cylinder
reaches or exceeds that of the refrigerant on
the discharge side. It thus prevents the
backward flow of discharge gas.
3.Condenser
The condenser is a heat exchanger whose
copper tubes are covered with thin aluminum
projections called spine fins. Heat is given off
and absorbed by air being pulled across the
condenser fins by the centrifugal fan and then
expelled through the exhaust air duct.

REFRIGERANT SYSTEM
11
High Temp. / High Press.
Liquid Refrigerant
Low Temp. / Low Press.
Gas and Liquid Mixture
From Evaporator
To Compressor
Capillary Tube
Accumulator
4.Capillary Tube
The capillary tube is a long thin tube and its line
flow resistance serves as an expansion valve. The
length and the inner diameter of the capillary tube
are determined according to the capacity of
refrigeration system, operating conditions and the
amount of refrigerant.
The capillary tube causes the high pressure, high
temperature liquid refrigerant sent from the
condenser to expand rapidly as the refrigerant is
sprayed out through the fixed orifice in the
capillary tube. As a result, the temperature and
state of the refrigerant become low and mist-like,
and therefore it evaporates easily.
5.Evaporator
The evaporator, like the condenser, is a heat
exchanger covered with spine fins. Heat is
removed from the air being pulled across the
evaporator by the centrifugal fan and the resulting
cool air is expelled through the cooling air ducts.
6.Accumulator
The accumulator is mounted on the suction gas
piping between the evaporator ond the compres-
sor. The accumulator separates the liquid refriger-
ant from the gas refrigerant letting only the gas
refrigerant enter the compressor. In the accumu-
lator, suction gas is led into a vessel having a
cylindrical body, and the gas speed is decreased
inside the vessel. This separates the refrigerant
contained in the gas by the force of gravity
causing it to accumulate at the bottom of the
vessel. This protects the compressor from
possible damage caused by the intake of liquid
refrigerant.

REFRIGERANT SYSTEM
12
EVAPORATOR
INLET PIPE
EVAPORATOR
OUTLET PIPE
ASSY
CAPILLARY TUBE
CONNECTING PIPE
(Evaporator to Compressor)
CONNECTING TUBE
(Condenser to Capillary Tube)
COMPRESSOR
SUCTION PIPE
(Insulated)
CONDENSER
OUTLET PIPE
COMPRESSOR
DISCHARGE PIPE
CONDENSER
INLET PIPE
Refrigerant System Piping

ELECTRICAL SYSTEM
13
G
AP
G
SCP TB
T R R1 R2 CC
12
G
1
2
0LCL0
HI
G
CF
12
MC
J4
J5
J6
J2
J1
J3
J8 (AUX1)
RB CB
THS RTH DS
3
2
1
AUX2
MF
IOLF
AP Attachment Plug
TB Terminal Block
CB Control Board
RB Relay Board
MF Fan Motor
MC Compressor Motor
CF Capacitor for Fan
CC Capacitor for Compressor
OLC Overload Relay of Compressor
DS Full Drain Warning Switch
THS Freeze Protection Thermister
RTH Room Thermister
SCP Short Circuit Plate
G Ground
J8 (AUX1) Auxiliary Connector (CPK-3)
AUX2 Auxiliary Connector (not used)
RELAY BOARD
DIP SWITCH
COMPRESSOR
CAPACITOR
FAN
CAPACITOR
TERMINAL
BLOCK
RELAY BOARD
FUSE
Electrical System and Control Box for Office Pro 12

ELECTRICAL SYSTEM
14
1.Basic Operation Of the Office P ro 12 Electrical Circuit
There are two basic components used to control the operation of the Office Pro 12 Electrical System:
•Control Panel Assembly
•Control Box
The Control Panel Assembly contains the Control Panel, Control Board, inputs for the freeze and room
temperature thermisters, drain switch, and a microprocessor.
A.Fan “Only” Mode
Low Fan Mode - When the “Low” Fan Mode button on the control panel is pressed, the microprocessor
turns on the button’s LED and activates the Fan “On” Relay (Relay Board), sending line voltage (115
VAC) to the N.C. (Normally Closed) contacts of the fan “mode” relay. This output is connected to the J5
terminal (relay board) where the LOW SPEED wire of the fan motor is connected.
High Fan Mode – When the “High” Fan Mode button on the control panel is pressed, the microproces-
sor turns on the button’s LED and activates both the Fan “On” Relay and Fan “Mode” Relay. This
sends line voltage (115 VAC) from the Fan “On” Relay to the N.O. (Normally Open) contacts of the Fan
“Mode” Relay. This output is connected to the J6 terminal (Relay Board) where the HIGH SPEED wire
of the Fan Motor is connected.
B.Cool Mode
In addition to Fan “Only” Mode (as described above) when the Cool On/Off button on the control panel
is pressed, the microprocessor turns on the button’s LED and if the Temperature Set Point is less than
the current room temperature, activates the Compressor Relay (Relay Board). This sends line voltage
(115 VAC) to the J4 terminal (Relay Board) where the wire from pin 2 of the Compressor Overload Relay
is connected to Pin 1 of the Compressor Overload Relay is connected (by wire) to the compressor.

ELECTRICAL SYSTEM
15
Compressor
Capacitor Fan Motor
Capacitor
Terminal
Block
Relay Board
Relay Board
Fuse
DIP Switch
Relay Board Fuse
S1
CF
STOP OPERATE
J9
Temperature Scale Display Switch
o
C
o
F
DIPSwitch
Fan Mode Control Switch
STOPOPERATE
Control Box
DIP Switch
Relay Board
2. Control Box
A.Capacitors
The capacitors are used to temporarily boost
the power output available to the fan motor
and the compressor at start-up.
The specifications of each capacitor are
listed below:
CAPACITOR VOLTAGECAPACITANCE
APPLICATION RATING (µf)
Fan Motor 370 7.5
Compressor 370 45
B.Relay Board
The Relay Board receives signals and outputs
from the control board that contains a micro-
processor. The relay board contains the
compressor, fan on and fan mode (speed)
relays. It also contains a step-down trans-
former that converts the line voltage (115
VAC) to 12 volts. This is then converted from
AC to DC and used for relay coil activation.
The 12V (DC) power is sent to the Control
Panel Assembly where it is further reduced to
5 volts for the system logic.
The relay board also contains the DIP-Switch.
The DIP-Switch is used to change the Fan
Mode operation from Stop to Operate and
change both the Set Point and Room tem-
perature display from ˚F to ˚C.
The relay board must be serviced as a
complete assembly. It has only one service-
able component, the fuse. (See below)
Relay Board Fuse
The relay board fuse is the only serviceable
component on the relay board assembly.
This fuse provides protection against damage
to the step-down transformer. It must be
replaced with the exact type of fuse or its
equivalent.
Fuse Specifications: 2/10A 250V
CAUTION: Failure to use the exact type of fuse
could result in damage to the unit and/or its
components. It will also void the unit’s warranty.

ELECTRICAL SYSTEM
16
CF1 (White)
CF2 (Brown/White)
J5 Low (Red)
J6 High (Black)
Ground
(Green/Yellow)
Fan Motor
3.Fan Motor
The fan motor is a single phase, induction type
two-speed motor. The motor rotates fans on the
evaporator side and the condenser side at the
same time.
Specifications:
Rated Voltage: 115 volts 60 hz
Rated Output: High – 135 watts
Low – 81 watts
UL Listed File Number – E-49807
NOTE: An internal overload relay is used to protect
the fan motor. This relay is built into the fan motor
and will interrupt the flow of current when there is
an overcurrent situation or if abnormally high
temperature builds up in the fan motor.
4.Compressor Motor
The compressor motor is a single-phase motor
and is contained within the same housing as the
compressor.
Specifications:
Rated Voltage: 115 volts
Rated Output: 800 watts
5.Compressor Overload Relay
An external compressor overload relay is used to
protect the compressor motor. This relay is
mounted within the connector housing that
attaches to the top of the compressor. The relay
will interrupt the flow of current when there is an
overload condition and a high temperature builds
up in the compressor.
Specifications:
TemperatureVariance Trip Time
(seconds)
Contacts Open 284˚F / 140˚C ±41˚F / ±5˚C
Contacts Closed 165˚F / 74˚C ±48˚F / ±9˚C 2 – 12