Movincool Classic Plus 26 User manual

SERVICE MANUAL
CLASSIC PLUS 26
DENSO SALES CALIFORNIA, INC.
REGISTERED TO ISO 9002
FILE NO. A55537

© 1999 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. MovinCool is a registerd trademark of DENSO Sales
California, Inc.

SERVICE MANUAL
CLASSIC PLUS 26

i
FOREWORD
This manual has been published to service the MovinCool Classic Plus 26. Please use this service manual only
when servicing the Classic Plus 26.
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 authorized
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

iii
Table of Contents
FOREWORD............................................................................................................................... i
DEFINITION OF TERMS............................................................................................................ i
GENERAL PRECAUTIONS........................................................................................................ i
GENERAL DESCRIPTION ........................................................................................................ 1
CONSTRUCTION, SPECIFICATIONS & DATA ........................................................................ 3
REFRIGERANT SYSTEM.......................................................................................................... 9
ELECTRICAL SYSTEM........................................................................................................... 14
TROUBLESHOOTING AND REPAIR...................................................................................... 19

iv

GENERAL DESCRIPTION
1
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 out-
doors. 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.
CONDENSER
(OUTDOOR UNIT)
EVAPORATOR
(INDOOR UNIT)
Conventional Air Conditioner
Air Flow of MovinCool Spot Cooling System

GENERAL DESCRIPTION
2

CONSTRUCTION, SPECIFICATIONS & DATA
3
Construction of Classic Plus 26

CONSTRUCTION, SPECIFICATIONS & DATA
4
Construction Diagram of Classic Plus 26
Base Panel
Air Filter
Evaporator)
Evaporator
Cool Air Duct
Control Panel
Blower Housing
Evaporator)
Evaporator Fan
Side Panel High Pressure Switch
Exhaust Air Outlet
Side Panel
Condenser
Caster
Rear Panel
Control Box
Compressor
Service Panel
Capillary Tube
Air Filter Condenser)
Modulating Tank
Condenser Fan
Blower Housing
Condenser)
Fan Motor
Upper Panel
Base Panel
Base Panel
Power Cord
Front Panel
Drain Pan
Drain Tube
Drain Tank
Drain Switch

CONSTRUCTION, SPECIFICATIONS & DATA
5
1. Basic Construction
The MovinCool Spot Cooling System is
compact in construction because the con-
denser 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 duct which
can be turned in any direction. All the air
inlets are equipped with filters, while the
exhaust air outlet is protected by wire mesh.
3. Compressor and Fans
The compressor is hermetically sealed. A
two-speed fan motor is used with two cen-
trifugal 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 "Tank
Full" LED and a device to automatically stop
the operation of the unit when the drain tank
reaches a level of approximately 4.0 gallons
(15liters).
Air Flow

CONSTRUCTION, SPECIFICATIONS & DATA
6
Rating Conditions
dry bulb 95oF (35oC)
wet bulb 83oF (28.3 oC)
humidity (60%)
Specifications
power frequency 60Hz
line voltage, single phase 208/230V
power consumption 3.37/3.24 Kw
current consumption 16.8/14.6 Amps
power factor 97%
starting current 62A
power cord 12 (3-core) AWG
Cooling Unit
cooling capability 6,500 Kcal/hr
26,000 Btu/hr
cooling system direct expansion
Blower
type of fan centrifugal fan
air volume: Evaporator (high speed) 708 cfm
Condenser (high speed) 1680 cfm
motor output (high speed) .59/.63 Kw
(low speed) .54/.56 Kw
Compressor
type hermetic scroll
output 1.6kw
refrigerant type R-22
refrigerant capacity 1.87 lbs. (0.85 kg)
Safety Devices
compressor overload protector included
fan motor protector included
anti-freezing thermistor included
full drain tank switch included
automatic restart (power interruption) included
compressor time delay program included
Dimensions & Weight
W x D x H (in.) 19.4 x 28.7 x 47.2
W x D x H (mm) 492 x 730 x 1200
weight (lbs/kg) 235/107
Operating Conditions
inlet air (relative humidity) 113oF (45 oC), < 50%
70oF (21.1 oC), > 50%
Control Device
temperature control included
two speed fan included
Specifications Specifications are subject to change without notice.

CONSTRUCTION, SPECIFICATIONS & DATA
7
23.76
29.24
10.60
3.70 10.80
2.62
7.283.84
3.72
28.40
21.88
2.80
3.88
48.0
44.12
12.56
16.80
19.60
Exterior Dimensions

CONSTRUCTION, SPECIFICATIONS & DATA
8
Cooling Capability Curve (high speed only)
Cool Air Temperature Difference Curve (high speed only)
Power Consumption Curve (high speed only)

REFRIGERANT SYSTEM
9
Refrigerant System
The component parts of the refrigerant system include the following:
•Compressor •Evaporator
•Condenser •High pressure switch
•Capillary tube •Modulating tank
These parts are all connected by copper piping. All the connections have been brazed.
Condenser
Modulating Tank
Evaporator
Capillary Tube
High Pressure Switch
Compressor

REFRIGERANT SYSTEM
10
1. Compressor
The compressor used for the unit is hermetically sealed. The compressor and the compressor motor are in
one casing.
B. Compressor Operation
1) Compression in the scroll is created by
the interaction of an orbiting spiral and a
stationary spiral. Gas enters the outer
openings as one of the spirals orbits.
2) The open passages are sealed off as gas
is drawn into the spiral.
3) As the spiral continues to orbit, the gas is
compressed into two increasingly smaller
pockets.
A. Compressor Theory of Operation
The scroll utilizes an involute spiral which, when matched with a mating scroll form, generates a series of
crescent-shaped gas pockets between the two members. During compression, one scroll remains
stationary (fixed scroll) while the other form (orbiting scroll) is allowed to orbit (but not rotate) around the
first form. As this motion occurs, the pockets between the two forms are slowly pushed to the center of
the two scrolls while simultaneously being reduced in volume. When the pocket reaches the center of
the scroll form, the gas, which is now at a high pressure, is discharged out of a port located at the
center. During compression, several pockets are being compressed simultaneously, resulting in a very
smooth process. Both the suction process (outer portion of the scroll members) and the discharge
process (inner portion) are continuous.

REFRIGERANT SYSTEM
11
4) By the time the gas arrives at the center
port, discharge pressure has been
reached.
5) Actually, during operation, all six gas
passages are in various stages of com-
pression at all times, resulting in nearly
continuous suction and discharge.
NOTE: Upon compressor shut-off, the compressor
may run backward for a moment or two until internal
pressures equalize. This has no effect on compres-
sor durability but may cause an unexpected sound
after the compressor is turned off and should not be
diagnosed as a malfunction.
2. 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
12
3. 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 refriger-
ant 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.
Capillary Tube Dimensions
Qty Purpose of Use I.D. mm) Length mm)
1 For cooling ∅1.5 ± 0.05 540
4. 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.
5. Modulating Tank
The modulating tank consists of a copper pipe
and tank sections, each being separated from the
other. The pipe connects to the evaporator outlet
at one end and to the compressor at the other;
the tank connects to the evaporator inlet. The
modulating tank is covered with insulation to
reduce thermal effects of ambient temperature. It
varies the quantity of refrigerant in the refrigerat-
ing cycle for optimum operating condition; it
stores part of refrigerant under light load and
delivers additional refrigerant to the cycle under
heavy load.
6. High Pressure Switch
The high pressure switch prevents the condenser
and compressor from being damaged by exces-
sively high pressure in the high pressure line of the
refrigeration cycle. The switch is normally closed.
The snap disk responds to variations in pressure
and, if pressure is abnormally high, the snap disk
moves down to push the pin down, causing the
internal contacts to open. This interrupts the
ground signal at the Control Board (J104 connec-
tor) which turns the compressor off.
Possible causes of this trouble include:
A. The condenser air filter is dirty, restricting air
flow.
B) The condenser blower is defective.
Capillary Tube
Modulating Tank
High Pressure Switch