EMI DUCTLESS SPLIT SYSTEM
CASSETTE EVAPORATOR
INSTALLATION MANUAL/OPERATING INSTRUCTIONS
P/N# 240-4235 Rev. 1.6 [1/05]
SPARE PARTS: For ease of identification when ordering
spare parts or contacting Enviromaster International LLC
about your unit, please quote the model number and serial
number. This information can be found on the rating plate
attached to your unit.
PRODUCT DESCRIPTION
The EMI Cassette series is available in nominal capacities
of 9,000 to 48,000 Btuh in DX refrigeration and reverse cycle
heat pump (CAH) or DX with hot water coil (CAHW) versions; also available are two pipe chilled water (CAF) and
four pipe chilled and hot water versions (CAF4) in 8,000 to
36,000 Btuh capacities; and, depending on the model, electric heat can also be factory fitted as an option. Designed for
low noise levels, easy installation and maintenance and a
slimline fascia, all ensure minimum obtrusion into the working environment.
NOMINAL CAPACITIES:
CAH/CAHW: 9,000 - 48,000 Btuh
CAF/CAF4: 8,000 - 36,000 Btuh
CONTROLS AND COMPONENTS
GENERAL STATEMENT
LOW VOLT TRANSFORMER (Standard): 24 Volt.
IMPORTANT: The information contained in this
manual is critical to the correct operation and maintenance of the EMI cassette and should be read by
all persons responsible for the installation, start up
and maintenance of the unit.
ELECTRO-MECHANICAL (Standard): Thermostat options
are cooling only, cooling and one stage auxiliary heat, cooling and one stage mechanical heating (heat pump system)
or cooling and two stage heating (heat pump & second stage
auxiliary heat). An optional thermostat can be obtained through
EMI or your local distributor.
SAFETY: The equipment has been designed and manufactured to meet international safety standards but, like any
mechanical/electrical equipment, care must be taken if you
are to obtain the best results.
NOTE: Make sure the thermostat is suitable for unit operation (i.e., cooling only, cooling/electric heat, etc.)
MICROPROCESSOR (Optional): A custom designed microprocessor is fitted to the cassette to enable room conditions to be maintained at a user defined setpoint. Communication to the controller is by a hand held infrared transmitter,
which includes a wall mounting bracket as standard.
1. Service and maintenance of this equipment should only
be carried out by skilled personnel.
2. When working with any air conditioning unit ensure that
the electrical disconnect supplying the unit is switched
off prior to servicing or repair work and that there is no
power to any part of the equipment. In the case of a DX
system, both the indoor and outdoor units should be
switched off.
The microprocessor allows five operating modes. These
modes are - fan only, dry cooling, cooling only, heating only
and heating/cooling auto changeover for maximum versatility. A temperature setpoint between 58°F - 90°F can also be
selected.
3. Also ensure that there are no other power feeds to the
unit such as fire alarm circuits, BMS circuits, etc.
The microprocessor monitors indoor coil temperature and
return air temperature. In heat pump units, a 24VAC signal
from the condensing unit is also monitored to signal the indoor unit that defrost of the outdoor coil is taking place. This
allows the same micro to control both heat pump and cooling only units. The receiver contains a self diagnostic feature. When a low indoor coil temperature is detected the
cooling action is stopped. If a sensor fails then an alarm is
4. Electrical installation, start up and maintenance work on
this equipment should be undertaken by competent and
trained personnel in accordance with local relevant
standards and codes of practice.
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displayed on the fascia mounted receiver. The microprocessor also limits the number of compressor starts per hour to
reduce wear on the compressor.
loosening the four M5 screws retaining the fascia in place.
The fascia can now be slid sideways and pulled away from
the chassis. When removing the Cassette chassis from the
box the four corner brackets should be utilized for lifting. In
order to protect the fascia from dirt and damage, it should be
returned to the box until it is ready to be installed.
The infrared transmitter is used to switch the unit on/off,
change temperature settings, fan speed, operating mode and
to toggle the motorized air sweep (where fitted). The microprocessor also has a built-in clock which can be activated to
enable the unit to be programmed with up to two separate
operating periods for the days of the week (Mon-Fri). The
clock provides On/Off unit operation and is not a night set
back or occupied/unoccupied control function. Mon-Fri will
operate as a ‘block’ of days and cannot be programmed
independently of one another. Saturdays and Sundays can
each be programmed with up to two separate operating periods and are programmed independently of weekdays and
each other.
BLANKING OFF: When branch ducting is to be used,
two polystyrene pieces for blanking off fascia openings are Included with the fascia packing. Up to two
opposing sides may be blanked off.
POSITIONING
CASSETTE - The Cassette installation position should
be selected with the following points in mind:
1. Pipe work, electrical connections and condensate pump
access panel should be readily accessible.
A fascia mounted receiver displays On/Off, cool or heat and
timer/alarm status.
2. When installing a unit with an externally mounted
electrical control panel, ensure that sufficient access to
the panel is provided for maintenance purposes. Access
to the condensate pump access panel should be
provided on all model sizes.
FILTERS: Wire framed filters are fitted. These are reusable
and may be vacuum cleaned.
CONDENSATE PUMP: A condensate pump is fitted to carry
water out of the unit. The pump is fixed to a mounting bracket
which can be withdrawn from the side of the chassis and
incorporates an inspection hole to allow a visual check of
the pump during operation. A float switch is fitted to stop the
cooling action should the pump become blocked or fail.
3. The unit should not be positioned less than 5 ft. from a
wall or similar obstruction, or in a position where the
discharge air could blow directly on the thermostat.
IMPORTANT: TOTAL LIFT FOR THIS PUMP
IS 18” OR LESS.
4. The unit should not be positioned directly above any
obstructions.
AIR VANES: Air outlet vanes are manufactured from aluminum and covered with nylon flock to prevent condensation
from forming. Vanes are manually adjustable on the 2 x 2
model units or driven by an electric motor on all other model
units. Where fitted, the motorized air vanes can be set to
auto sweep or can be stopped in a fixed position.
5. The condensate drain should have sufficient fall (1” per
10’) in any horizontal run between Cassette and drain.
Maximum condensate pump lift is 18".
6. There should be sufficient room above the false ceiling
for installing the Cassette as shown below (see
“dimensions” in this IOM for cabinet sizing):
HEATING: The cassette may be fitted with either electric
heaters or a hot water coil. It is recommended that heat
pumps be fitted with the electric heat option to offset the
defrost cycle. Electric heaters are fitted with over-heat cut
out switches.
Small Cabinet
Medium Cabinet
Large Cabinet
A = 12-3/4” min.
A = 11-1/2” min.
A = 13-1/2” min.
ELECTRO-MECHANICAL THERMOSTAT - In addition to positioning the Cassette correctly, it is very important to locate
the wall mounted thermostat in the optimum position to ensure good temperature control. Therefore the installation
should be selected with the following points in mind:
FRESH AIR CONNECTION: Fresh air may be introduced to
the unit by the addition of ducts connected to the fresh air
knockouts on the Cassette case. It is usually advised that
the fresh air volume is approximately 10% of the unit’s published maximum air flow.
SITE INSTALLATION
UNPACKING: The cassette fascia and main chassis are
supplied together for increased protection. Remove the banding straps and lift the cardboard lid. Remove the bubble wrap
and polystyrene packing pieces to expose the unit. The fascia should be unpacked first by unclipping the inlet grille and
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1. Position the thermostat approximately 5 ft. above floor
level.
OUTER CASE
INSULATION
2. Do not position thermostat where it can be directly
affected by the unit’s discharge air stream.
CASSETTE CASE
INNER CASE INSULATION
3. Avoid external walls and drafts from windows and doors.
4. Avoid positioning near shelves and curtains as these
restrict air movement.
5. Avoid heat sources (direct sunlight, heaters, dimmer
switches, etc.)
FALSE CEILING
GUIDE IN
POSITION
CEILING OPENING: Before beginning the installation, inspect the unit location, test the strength of the unit
mountings (see “Mechanical Information” in this IOM). An
opening in the false ceiling will then have to be cut to the
following sizes:
Small Cabinet
Medium Cabinet
Large Cabinet
NOTE: If the ceiling is not level or even, it is important
that the Cassette is installed level to ensure correct
pump operation and to maintain fan clearances. Any
slight discrepancy between the Cassette and ceiling
will be taken up by the fascia foam seal.
23-1/4” x 23-1/4”
33-7/8” x 33-7/8”
46 x 33-7/8”
Secure unit in position with locknuts and washers on either
side of the Cassette bracket. Ensure threaded rod does not
protrude more than 2” (dimension C) below the mounting
bracket.
A template for ceiling cut-out and rod positions can be found
with the Cassette unit.
NOTE: Make sure the ceiling grid is supported separately
from the Cassette. The ceiling must not be supported by
any part of the Cassette unit, fascia or any associated wiring or pipe work.
The hanger bolts can now be installed (use 3/8 all thread
rod) at the centers shown below:
The unit can now be piped up in accordance with good refrigeration and/or plumbing practices.
CABINET
A
B
23"
SMALL 19-1/2"
MEDIUM 29-5/8" 31-1/2"
LARGE 29-5/8" 43-11/16"
CONDENSATE PIPEWORK: The Cassette is supplied with
a 1/2" diameter flexible PVC hose for connection to copper
or plastic drain pipework. When installing the Cassette the
following points should be remembered:
Prepare the installation guides by folding the metal bracket
by hand along the row of holes.
1. Maximum pump lift is 18”.
2. The highest point in the condensate pipework should be
as close to the unit as possible. This prevents a large
volume of water draining back into the unit when it is
switched off.
FOLDED GUIDE
The Cassette can now be lifted onto the hanging rods and
leveled at the correct distance from the ceiling with the aid of
the installation guides as shown.
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3. Condensate pipework should slope downwards in the
direction of water flow with a minimum gradient of (1” per
10’). There must not be any uphill gradients other than
in the first 18” of pipework from the Cassette.
FASCIA BLANKING PIECE
4. When multiple Cassettes are connected to a common
condensate drain, ensure the drain is large enough to
cope with the volume of condensate from several
Cassettes. It is also recommended to have an air vent in
the condensate pipework to prevent any air locks.
SECTION THROUGH FASCIA
Before tightening the fascia to the unit, connect the two halves
of the vane motor’s plug and socket connection (where applicable).
DUCT COLLARS: Branch duct and fresh air duct collars
can be attached to the Cassette chassis by following the
steps below:
On microprocessor controlled units, ensure that the display
panel cable is routed to the electrical panel and securely
fastened to its connector on the microprocessor circuit board.
(Refer to the unit’s electrical wiring schematic). Take care
to ensure that the connector is connected in the proper orientation and that the wires are not routed such that they
may become trapped, cut, broken or chaffed.
1. Refer to the relevant illustration for your Cassette (pages
6 -7 in this IOM) to become familiarized with knock-out
hole locations.
2. The insulation is pre-cut to aid location and removal of
the relevant section. Rub hand across surface of
insulation to reveal exact location of knock-out.
The fascia can now be tightened up to the Cassette chassis
until a good seal is obtained between fascia and chassis.
3. Remove the metal knockout from the chassis.
NOTE: Do not over tighten the bolts. To do so may
cause damage to the fascia.
4. Attach the duct collar to the chassis using self tapping
screws.
With filters in place, the inlet grilles can now be fitted to the
fascia to complete the installation.
NOTE: Branch ducts are round and 5 - 6” in diameter.
Fresh Air ducts are square and 3” in diameter.
ELECTRICAL DATA
INSULATION: Refrigerant, chilled water and condensate
pipes should be insulated right up to the Cassette chassis.
Chilled water valves must also be insulated to prevent sweating.
(See Appendix 1 on page 18 for wiring charts and instructions.)
All power and interconnecting wiring between units should
be carried out to conform with local/national electrical codes.
A fused and dedicated electrical supply of the appropriate
phase, frequency and voltage should be installed by the customer. It is also recommended that a local disconnect switch
be connected within 3’ of the unit. In some areas this may
be a code requirement.
ASSEMBLY: Once the services have been connected the
four fascia mounting bolts can be unscrewed approximately
1” from the condensate tray support channels.
The fascia can now be unpacked ready for fitting to the Cassette chassis. Ensure the black fir tree fasteners holding
the fascia polystyrene are pushed in firmly in case of transit
vibration. If a fascia aperture needs blanking off, then take
one of the polystyrene blanking pieces and push it into the
recess in the polystyrene fascia insulation. Fit by removing
the inlet grilles and filters, locating the four fascia mounting
bolts on the chassis through the four keyhole brackets on
the fascia and then sliding the fascia sideways until it locks
into position.
EMI equipment in its standard form is designed for an electrical supply of 208-230V, 1Ph, 60Hz. When connection to a
115V, 1Ph, 60Hz supply is necessary, a factory mounted
buck boost transformer will be fitted to the unit.
The wires should be capable of carrying the maximum load
current under non-fault conditions at the stipulated voltages.
Avoid large voltage drops on cable runs, particularly in low
voltage wiring. The correct cable size must be used to ensure a voltage drop of less than 1 volt in the control wiring.
Once the refrigeration pipe work is complete, the electrical
supply can be connected by routing the cable through the
appropriate casing hole and connecting the supply and ground
cables to the unit’s power terminals. On the medium and
large cabinets, it will be necessary to remove the insulated
condensate tray support rail, adjacent to the casing hole.
NOTE: Up to two non-adjacent sides can be blanked
off.
NOTE: On electro-mechanical units, the fascia must
be installed with the EMI logo along the same edge of
the unit as the electrical panel. On units fitted with
microprocessor controls, orient the fascia with the display panel along the same edge of the unit as the
electrical panel.
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ELECTRICAL SPECIFICATIONS
STANDARD UNIT DATA
POWER SUPPLY
FULL LOAD AMPS
MIN. CIRCUIT AMPACITY (MCA)
REC. FUSE
WITH OPTIONAL ELECTRIC HEAT 1
POWER SUPPLY
ELECTRIC HEAT CAPACITY
HEATER AMPS
FULL LOAD AMPS
MIN. CIRCUIT AMPACITY (MCA)
REC. FUSE WITH HEAT
WITH OPTIONAL BOOST TRANSFORMER 2
POWER SUPPLY
FULL LOAD AMPS
MIN. CIRCUIT AMPACITY (MCA)
REC. FUSE
A
A
A
KW
A
A
A
A
A
A
A
SMALL
MEDIUM
LARGE
230V/1PH/60HZ
0.4
0.5
15
SMALL
230V/1PH/60HZ
1.5
6.52
7.0
8.8
15
SMALL
115V/1PH/60HZ
0.8
1.0
15
230V/1PH/60HZ
0.6
0.75
15
MEDIUM
230V/1PH/60HZ
3.0
13.1
13.7
17.1
20
MEDIUM
115V/1PH/60HZ
1.2
1.5
15
230V/1PH/60HZ
0.9
1.13
15
LARGE
230V/1PH/60HZ
5.0
21.7
22.6
28.3
30
LARGE
115V/1PH/60HZ
1.8
2.26
15
(1) STANDARD UNIT FITTED WITH OPTIONAL ELECTRIC HEATING ELEM ENTS. AVAILABLE WITH 230V M ODEL UNITS ONLY.
(2) STANDARD UNIT FITTED WITH OPTIONAL BOOST TRANSFORM ER FOR CONNECTION TO A 115V ELECTRICAL SUPPLY. ELECTRIC HEAT
IS NOT AVAILABLE WITH THIS OPTION.
The vacuum pump should be operated until a pressure of
500 microns absolute pressure is reached, at which time
the vacuum pump should be stopped and the vacuum broken with oxygen free nitrogen until the pressure rises above
zero.
REFRIGERATION SYSTEM (DX UNITS)
PIPE INSTALLATION NOTES
1. When cooling only or heat pump units are being installed,
it is usually only necessary to insulate the suction line.
However, if the liquid line is subject to high temperature
or exposed to direct sunlight, this should also be
insulated.
The above operation should be repeated a second time.
The system should then be evacuated a third time but this
time to 100 microns absolute pressure. After stopping the
pump, open the condensing unit’s service valves to break
the vacuum.
2. Maximum equivalent pipe run should be no more than
100’, with a maximum rise of 35’.
3. Horizontal pipe runs should be slightly inclined, so as
to encourage oil to flow in the direction of the compressor,
for better oil return.
START UP PROCEDURES
PRE-START: Once installation is complete it is important
that the following pre-start checks are made.
4. Good refrigeration practices must be employed to ensure
the correct pressure drop and good oil return.
1. All pipe work is complete and insulated where necessary.
PRESSURE TESTING: When installation is complete, fill
the Cassette and interconnecting pipework with dry nitrogen
to a pressure of 150 PSIG. Record the pressure over a period of time (a minimum period of 60 minutes should be sufficient to detect any major leaks, however, ideally 24 hours
should be allowed). If there is any reduction in pressure,
trace the leak and repair before conducting a further pressure test.
2. All fans are able to rotate freely.
3. The Cassette and interconnecting pipe work have
been evacuated correctly and the Condensing Unit’s
service valves are open (DX units only).
4. All electrical connections (both power and control)
are properly terminated.
EVACUATION: Evacuation should be carried out with a high
vacuum pump. The pump should be connected to the high
and low pressure sides of the system via a gauge manifold
fitted with compound gauges. A high vacuum gauge should
be fitted to the system at the furthest point from the vacuum
pump.
5. All condensate drains are installed correctly.
6. The power supply is of the correct voltage and frequency.
7. The units are properly grounded in accordance with
current electrical codes.
Triple evacuation should be used to ensure that all contaminants are removed or at least reduced to significantly low
proportions.
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START UP PROCEDURES
8. For microprocessor controlled units, check that
the display panel cable is properly connected to
the microprocessor main circuit board and that the
jumper links are correctly set (refer to unit wiring
schematic). If the links are set incorrectly, remove
main power before making any changes.
Once the above pre-start checks have been carried out satisfactorily, the main start up operation can begin.
IMPORTANT: The jumper links referenced in step
8 must be correctly set before applying mains
power, to ensure correct operation of unit. (micro
units only)
9. For microprocessor controlled units, check that
the battery on the main circuit board is in place
and properly connected. Check also that the batteries are installed in the infrared unit.
START UP SHEET EXAMPLE
EMI CASSETTE - CAH/W, CAF/4
ENVIROMASTER INTERNATIONAL LLC
TO BE COMPLETED IN CONJUNCTION WITH START UP PROCEDURE
RETURN ONE COPY TO EM I A ND RETAIN ORIGINA L FOR YOUR RECORDS
TECHNICIAN:
MODEL/SERIAL NO:
COMPANY:
PROJECT:
DATE:
5780 SUCCESS DRIVE
ROM E, NY 13440
TEL: 1-800-228-9364
FAX: 1-800-232-9364
HTTP ://WWW.ENVIROM ASTER.COM
1.0 PRE START UP CHECKLIST
1.1 UNIT CONDITION SATISFACTORY
1.2 PRESSURE TEST WITH DRY NITROGEN
COMMENT:
INITIAL TEST
PRESSURE
FINAL TEST
PRESSURE
TEST DURATION
GPM
1.3 DESIGN WATER FLOW AVAILABLE IF
CHILLED WATER UNIT
1.4 VOLTAGE AT OUTDOOR UNIT
1.5 VOLTAGE AT INDOOR UNIT
1.6 ELECTRICAL CONNECTIONS TIGHT
1.7 JUMPERS SET CORRECTLY (MICRO ONLY)
V
V
YES/NO
YES/NO
2.0 START UP CHECKLIST - INDOOR UNIT
2.1 DISABLE COMPRESSOR SIGNAL
2.2 ON/OFF WORKS
2.3 INDOOR UNIT: THREE FANS SPEEDS
AVAILABLE (MICRO ONLY)
2.4 VANE SWEEP FUNCTIONS
2.5 TIMER FUNCTIONS OPERATE (MICRO ONLY)
2.6 CONDENSATE PUMP OPERATES
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
3.0 START UP CHECKLIST - OUTDOOR UNIT (REFER TO THE RELEVANT OUTDOOR UNIT MANUAL AND, IN ADDITION, NOTE THE FOLLOWING:
3.1 OPERATING PRESSURES
3.2 SUCTION
3.3 DISCHARGE
3.4 AMBIENT TEMPERATURE
35. INDOOR AIR TEMPERATURE
PSIG
PSIG
ºF
ºF
NOTE: A START UP SHEET FOR EVERY UNIT MUST BE RETURNED TO EMI TO VALIDATE THE WARRANTY.
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EMI CASSETTE MECHANICAL DATA
NOTE: Due to EMI’s ongoing product development program, all designs and specifications are subject to change without notice.
CAH/W TECHNICAL DATA
REFRIGERATION
NUMBER OF CIRCUITS
REFRIGERANT TYPE
CABINET DIMENSIONS
HEIGHT
WIDTH
DEPTH
WEIGHT
FASCIA DIMENSIONS
HEIGHT
WIDTH
DEPTH
WEIGHT
CONNECTIONS
SUCTION
LIQUID
CONDENSATE
BRANCH DUCT DIAMETER
FRESH AIR DUCT DIAMETER
HOT WATER INLET*
HOT WATER OUTLET*
FILTRATION
TYPE
QUANTITY
ARRESTANCE
CONDENSATE PUMP
MAXIMUM HEAD
NOMINAL FLOW RATE (GPM)
09-12
1
R22
09-12
10-3/4"
22-1/2"
22-1/2"
40 LBS.
09-12
2-1/4"
25"
25"
5 LBS.
09-12
1/2"
1/4"
1/2"
5"
3"
1/2"
1/2"
09-12
15
18-24
30-36
1
1
1
R22
R22
R22
15
18-24
30-36
9-1/2"
9-1/2"
11-1/2"
32-1/4"
32-1/4"
44-1/2"
32-1/4"
32-1/4"
32-1/4"
64 LBS.
64 LBS.
97 LBS.
15
18-24
30-36
3"
3"
3"
37"
37"
49-1/4"
37"
37"
37"
18 LBS.
18 LBS.
21 LBS.
15
18-24
30-36
1/2"
5/8"*
3/4"
1/4"
3/8"
3/8"
1/2"
1/2"
1/2"
5"
5"
6"
3"
3"
3"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
15
18-24
30-36
WIRE FRAMED PERIFRAME
2
2
3
0.8
0.8
0.8
15
18-24
30-36
18"
18"
18"
0.1
0.1
0.1
1
0.8
09-12
18"
0.1
42-48
1
R22
42-48
11-1/2"
44-1/2"
32-1/4"
97 LBS.
42-48
3"
49-1/4"
37"
21 LBS.
42-48
3/4"**
3/8"
1/2"
6"
3"
1/2"
1/2"
42-48
3
0.8
42-48
18"
0.1
* 3/4" SUCTION A T EM I CONDENSER. ** 7/8" SUCTION A T EM I CONDENSER.
CAF/4 TECHNICAL DATA
CABINET DIMENSIONS
HEIGHT
WIDTH
DEPTH
WEIGHT
FASCIA DIMENSIONS
HEIGHT
WIDTH
DEPTH
WEIGHT
CONNECTIONS
CHILLED WATER INLET
CHILLED WATER OUTLET
CONDENSATE
BRANCH DUCT DIAMETER
FRESH AIR DUCT DIAMETER
HOT WATER INLET*
HOT WATER OUTLET*
FILTRATION
TYPE
QUANTITY
ARRESTANCE
CONDENSATE PUMP
MAXIMUM HEAD
NOMINAL FLOW RATE (GPM)
8
10-3/4"
22-1/2"
22-1/2"
40 LBS.
08
2-1/4"
25"
25"
5 LBS.
08
1/2"
1/2"
1/2"
5"
3"
1/2"
1/2"
08
12
9-1/2"
32-1/4"
32-1/4"
64 LBS.
12
3"
37"
37"
18 LBS.
12
3/4"
3/4"
1/2"
5"
3"
1/2"
1/2"
12
1
0.8
08
18"
0.1
2
0.8
12
18"
0.1
18
20
33
9-1/2"
9-1/2"
11-1/2"
32-1/4"
32-1/4"
44-1/2"
32-1/4"
32-1/4"
32-1/4"
64 LBS.
64 LBS.
97 LBS.
18
20
33
3"
3"
3"
37"
37"
49-1/4"
37"
37"
37"
18 LBS.
18 LBS.
21 LBS.
18
20
33
3/4"
3/4"
3/4"
3/4"
3/4"
3/4"
1/2"
1/2"
1/2"
5"
5"
6"
3"
3"
3"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
18
20
33
WIRE FRAMED PERIFRAME
2
2
3
0.8
0.8
0.8
18
20
33
18"
18"
18"
0.1
0.1
0.1
36
11-1/2"
44-1/2"
32-1/4"
97 LBS.
36
3"
49-1/4"
37"
21 LBS.
36
3/4"
3/4"
1/2"
6"
3"
1/2"
1/2"
36
3
0.8
36
18"
0.1
* UNITS FITTED WITH OP TIONA L HOT WA TER COIL ONLY
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EMI CASSETTE DIMENSIONS
SMALL CABINET
• CAH 9,000 - 12,000
• CAHW 9,000 ONLY
• CAF 8,000 - 12,000
• CAF4 8,000 ONLY
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EMI CASSETTE DIMENSIONS
MEDIUM CABINET
• CAH 15,000 - 24,000
• CAHW 12,000 - 24,000
• CAF 18,000 - 20,000
• CAF4 12,000 - 20,000
LARGE CABINET
• CAH/W 30,000 - 48,000
• CAF/4 33,000 - 36,000
CASSETTE DIMENSIONS (INCHES)
SIZE
A
B
C
11
37
37
MEDIUM
13
49¼
37
LARGE
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D
1¾
1¾
E
32¾
32¾
F
32¾
45
G
2¾
2¾
9
H
½
½
J
Ø5
Ø6
K
3¼
13¼
L
9½
9½
M
¾
¾
N
33¼
45½
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MICROPROCESSOR CONTROLLER
The following pages contain a brief overview of the optional
cassette microprocessor control system and its components.
The Infra-Red Remote Control manual is available from the
unit manufacturer and provides a more comprehensive explanation of the operation and application of the Cassette
microprocessor control system.
ping and starting is also included to allow refrigerant pressures to equalize between high and low sides during the
compressor off period.
IMPORTANT: Before applying main power to the unit,
please ensure jumper link “JMP2” is in the correct
position. JMP2 should be open for DX Non-Heat Pump
or Chilled Water systems and closed for Heat Pump
systems. (A jumper link settings guide can be found
on the Cassette unit’s wiring schematic).
The microprocessor controller has built-in software to limit
the number of starts per hour. This operates by having a
minimum period of ten minutes between consecutive starts.
A four minute delay period between the compressor stop-
COMPRESSOR
230V AC
TERMI-
10A FUSE
230V AC TRANSFORMER
TERMINAL
BATTERY
COMPRESSOR
IR RE-
HEAT OUTPUT
SENSOR
T1 = ROOM SENSOR
T2 = DEFROST INPUT
HEAT INPUT
CONDENSATE
VANE MOTOR OUTPUT
INDOOR FAN
REVERSING VALVE
JUMPER
INFRARED RECEIVER & FASCIA DISPLAY PANEL
The infrared receiver is an extension of the control board and
is located on the fascia of the unit, connected by a 7 pin
plug and socket.
The red indicator will be lit when the in-built time clock function is activated. To disable the time clock, all start/stop
times must be set to 12am via the transmitter (see programming instructions in this installation manual). The red indicator is also used to diagnose operational alarms.
SELF DIAGNOSTICS: The microprocessor controller has a
built-in diagnostics feature so that, in the event of an alarm,
the nature of the fault can be determined. The red timer/
alarm LED flashes on the fascia in a pre-determined frequency depending on the fault. These are identified below:
1. Red Timer/Alarm flashes once every second - indoor coil sensor failure, low coil temperature or
condensate high level trip.
The green On/Off indicator will remain lit when the unit is
running or will flash if heating or cooling is required but the
compressor anti-cycle timer is delaying compressor operation.
2. Red Timer/Alarm flashes once every 5 seconds return air sensor failure.
Refer to the Troubleshooting section of this
manual for further instruction on dealing with
alarms.
Yellow indicators will illuminate to show when the unit is in
“cool” or “heat” mode. These indicators will flash when the
battery on the main circuit board requires changing.
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THE INFRARED TRANSMITTER
STANDARD HAND HELD TRANSMITTER: Small, light and practically designed, the hand held transmitter takes 2 AAA batteries that can be easily
fitted by removing the sliding lid on the underside of the transmitter. Please
pay attention to the polarity and correct orientation of the batteries during
fitting.
When using the infrared handheld transmitter, always point the transmitter
head directly at the receiver. Use the On/Send button to transmit settings to
the microprocessor. At the time of transmission the
symbol will display
and an audible buzzer will sound if the signal has been correctly received.
After changing any of the settings in the transmitter’s LCD display, the new
settings must be transmitted to the unit using the On/Send button before the
changes will take effect.
DISPLAY INDICATORS
ON/SEND
Press this button to switch the unit on and transmit
the system settings. The unit will confirm receipt of
the adjustment by producing a short audible tone.
SELECTOR BUTTONS
TRANSMIT INDICATOR
Flashes when system
settings are transmitted.
MODE OF OPERATION
Selects the mode options: Heat, Cool, Auto Heat/
Cool, Dry Coooling, and Fan Only.
MODE INDICATOR
Highlights Mode of Operation.
FAN
Selects fan speed options: Low, Medium, High,
and Auto.
CLK/TIMER +/Selects and adjusts the clock or weekly program Stop/Start times.
FAN MODE INDICATOR
Highlights Fan Speed.
TEMP +/Adjusts temperature setpoint in intervals of 1ºF
beftween 58 - 90ºF.
CLOCK/TIMER DISPLAY
Shows current day, time,
or weekly program Stop/Start times.
SLEEP
Selects/Deselects sleep mode. Using the On/
Send button, the temperature setpoint will set
back 2ºF after 1 hour, 4ºF after 2 hours.
SETPOINT DISPLAY
Indicated temperature setpoint.
SWING INDICATOR
Indicates operation of the
motorized air vanes (where fitted).
SWING
Causes the motorized air vanes to oscillate
when selected (not applicable to all models).
SLEEP INDICATOR
Indicates when
Sleep mode is selected.
OFF
Switches the unit off (in certain instances the
fan may be subject to a 2 minute run on time to
dissipate residual heat).
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NOTE: Display will stop flashing after 15 seconds.
SETTING UP THE BUILT-IN
TIME CLOCK
2. Select Program 1 by pressing (+) or (-). “Program
1” and “Start Time will flash.
HOW TO SET THE PRESENT TIME
1. Press CLK/Timer: “Clock Set” highlights.
NOTE: Display will stop flashing after 15 seconds.
3. Press (+) or (-) to select and change hours.
4. Press CLK/Timer to move to minutes.
5. Repeat steps 3 and 4. “Stop Time” will flash.
6. Repeat steps 3, 4, and 5. “Program 2” and “Start
Time” will flash.
7. Repeat steps 3, 4, and 5. “Send” will flash.
8. Press On/Send to switch unit on and transmit system settings.
2. Select Hour with either (+) or (-). figure will flash.
3. Press (+) or (-) to change hour.
4. Press CLK/Timer to confirm and advance.
5. Repeat steps 3 and 4 for minutes and day of week.
6. Press CLK/Timer to confirm.
NOTE: A small clock symbol will appear in the transmitter display and the red LED indicator on the fascia
display panel will illuminate to indicate the weekly program is in operation.
HOW TO SET COOL, HEAT, OR AUTO MODE
1. Press Mode button until desired mode is highlighted.
2. Select temperature with Temp +/- buttons (range
58°F to 90°F).
3. Select desired fan speed with Fan button.
4. Press the On/Send to switch unit on and transmit
system settings.
HOW TO SET THE WEEKLY PROGRAM (Saturday)
1. Press CLK/Timer three times. “Program” and “SA”
highlight.
NOTE: Display will stop flashing after 15 seconds.
2. Repeat as per Monday - Friday (above).
HOW TO SET DRY MODE
HOW TO SET THE WEEKLY PROGRAM (Sunday)
Repeat Steps 1, 2, and 4.
1. Press CLK/Timer four times. “Program” and “SU”
highlight.
NOTE: During the dry mode the system operates in
cooling only mode and the indoor fan is fixed at low
speed.
NOTE: display will stop flashing after 15 seconds.
2. Repeat as per Monday - Friday (above).
HOW TO SET FAN ONLY MODE
IMPORTANT: The built-intime clock provides ON/
OFF functionality. The time clock does not provide occupied/unoccupied time control. Refer to
the separate Infrared Controller manual for further details.
Repeat Steps 1, 2, and 4.
NOTE: During the fan only mode only the indoor fan
will operate, cooling and heating will be disabled.
HOW TO SET THE WEEKLY PROGRAM
(Monday - Friday)
1. Press CLK/Timer: twice "Program" highlights.
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IMPORTANT: As of 12/01/04 EMI air handlers will be manufactured with a low Volt transformer installed. At the same
time, EMI outdoor condensers will be manufactures without a low Volt transformer. When connecting an EMI evaporator to a non-EMI condenser, check to ensure that there is a
24V control transformer in either in the indoor unit or outdoor
unit. Only one transformer is required. If a transformer is not
present then one should be added to the indoor unit. If both
the indoor unit and outdoor unit contain a transformer, one
must be remover from the system.
UNIT START UP - INDOOR UNIT
CONTROL CIRCUIT CHECKS (DX Units)
NOTE: Apply power to the Condensing Unit’s crankcase
heater for 24 hours before start up to boil off any liquid that
may be present in the compressor.
1. After 24 hours, the compressor should be isolated
by removing the connection at the “Y” terminal on
the outdoor unit. Main power can now be applied to
the indoor and outdoor units. A system electrical
check can now be carried out.
CONTROL CIRCUIT CHECKS
(Chilled Water Units)
2. Switch on the indoor Cassette unit and check that
the fan cycles correctly.
A thorough pipe work check and pressure test should be
performed before the Cassette controls are set up.
NOTE: In some models there is a two minute fan
run on time to remove residual heat from the Cassette, if the unit is switched off during the heating
mode.
1. Isolate the Cassette from the chilled water supply.
A system electrical check can now be carried out.
2. Switch on the indoor Cassette unit and check that
the fan cycles correctly.
3. On models with microprocessor controls, check
that the High, Medium and Low fan speeds are operating correctly by changing the fan speed via the
transmitter.
NOTE: In some models there is a two minute fan run on
time to remove residual heat from the Cassette, if the unit is
switched off during the heating mode.
4. On models 15-48, check that the motorized vane
sweep functions correctly by toggling the function
on or off, either via the transmitter (micro units) or
via the toggle switch on the back of the electrical
panel lid (electro-mechanical units).
3. On models with microprocessor controls, check
that the High, Medium and Low fan speeds are operating correctly by changing the fan speed via the
transmitter.
5. On micro controlled units, if required, check that
the built-in timer function is programmed and operating correctly. When the timer is activated, the
red LED on the fascia display panel should be lit.
4. On models 15-48, check that the motorized vane
sweep functions correctly by toggling the function
on or off, either via the transmitter (micro units) or
via the toggle switch on the back of the electrical
panel lid (electro-mechanical units).
6. Check the operation of the condensate pump by
pouring 7-8 ounces of water down the pump outlet,
switch the unit on, select cooling mode and the
lowest possible temperature setpoint then observe
the water being pumped from the Cassette.
5. On micro controlled units, if required, check that
the built-in timer function is programmed and operating correctly. When the timer is activated, the
red LED on the fascia display panel should be lit.
7. Where fitted, check the operation of the hot water
valve or the electric heat elements by switching
the system to the heating mode and selecting the
highest possible temperature setpoint.
6. Check the operation of the condensate pump by
pouring 7-8 ounces of water down the pump outlet,
switch the unit on, select cooling mode and the
lowest possible temperature setpoint then observe
the water being pumped from the Cassette.
8. Ensure that the Condensing Unit start up procedure has been carried out as detailed in the corresponding installation manual.
7. Allow chilled water to enter the Cassette and vent
air from the unit by opening the 1/4" air bleed. Retighten the bleed screw once all air has been removed.
9. The compressor signal “Y” (disconnected from the
outdoor unit in step 1) can now be reconnected
and main power applied to the system.
8. Repeat steps 1-4 above for all Cassettes in the
same systems.
The Cassettes are now ready for the system balance to be
performed.
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TROUBLESHOOTING SECTION
TRANSMITTER FAILURE (MICRO UNITS ONLY). Try new
batteries first, if receiver bleeps on transmitting signal, transmitter is OK. If no response press On/Off button on unit
fascia. If the unit responds to the On/Off button transmitter
is faulty.
RED ALARM LED FLASHING AT 1 SECOND
INTERVALS (Microprocessor units only)
POSSIBLE CAUSES/REMEDIES
FAULTY FLOAT SWITCH. See section “Condensate High
Level.”
MICROPROCESSOR FAILURE (MICRO UNITS ONLY). The
microprocessor is the least likely component to be at fault.
Investigate all other possibilities in every section of this
troubleshooting guide first. Replace the micro only after all
other avenues of investigation are exhausted.
FAN TRIP. See section “Fans Will Not Run.”
INDOOR COIL SENSOR FAILURE (CONNECTED TO MICRO TERMINAL ‘T3’). After checking the above, use the
unit wiring schematic to isolate the indoor coil sensor and
measure the resistance. Sensor is 50K@72°F type. Check
and replace if necessary.
WATER LEAKING FROM UNIT
(See “Condensate High Level.”)
POSSIBLE CAUSES/REMEDIES
RED ALARM LED FLASHING AT 5 SECOND
INTERVALS (Microprocessor units only)
CONDENSATE PLUG LOOSE OR MISSING. Check that
the rubber condensate plug is securely fitted to the underside of the unit’s polystyrene drip tray. On some models this
is located underneath the fascia support rails on the pump
side of the unit.
POSSIBLE CAUSES/REMEDIES
RETURN AIR SENSOR FAILURE (CONNECTED TO MICRO
TERMINAL ‘T1’). Use the unit wiring schematic to isolate
the return air sensor and measure the resistance. Sensor is
50K@72°F type. Check and replace if necessary.
UNIT INSTALLED UNEVENLY. With fascia removed, ensure
that the unit chassis is level (at the face) both front to back
and left to right, to ensure correct condensate flow.
UNIT WILL NOT OPERATE
CONDENSATE DRAIN PIPING INSTALLED INCORRECTLY.
Check that the site installed condensate gravity drain slopes
‘downhill’ away from the unit (See installation section of this
manual for more information.)
POSSIBLE CAUSES/REMEDIES
NO POWER (MAIN POWER). Check power supply to the
unit. For micro units, check power to the micro and check
the on board micro fuse.
BLOCKED/KINKED CONDENSATE PIPE. Check condensate pipework for blocks/kinks and clear as necessary. Check
for a water tight connection between the PVC condensate
outlet and the site installed condensate gravity drain.
NO 24V CONTROL CIRCUIT POWER. For DX and chilled
water systems, first check that the condensing unit is
switched on, then check the 24V feed from the control transformer. If not present, check transformer windings – replace
if necessary.
CONDENSATE PUMP BLOCKED OR FAILED. Clear any
blockages and ensure that power is being applied to the
pump. If the pump still does not run, replace the pump.
CONTROL CIRCUIT DISABLED BY UNIT PROTECTION
DEVICE. In some models, particularly electro-mechanical
units, some protection devices (such as freeze-stats, fan
trips, etc) are wired in line with the 24V control circuit feed to
cause the unit to shut down in an alarm condition. Use the
unit’s wiring schematic to identify these devices and investigate accordingly.
FLOAT SWITCH FAILURE. Check that the float switch operates correctly and is properly positioned. Float switch is
normally closed, opens on rise of water level.
CONDENSATE HIGH LEVEL
(Red alarm LED on Micro Unit
will flash at one second intervals.)
INFRARED RECEIVER FAILURE (MICRO UNITS ONLY). If
audible bleep is heard on signal transmission from transmitter and the green LED is lit or flashing, receiver is OK. If
there are no LEDs lit and the unit will not respond to the
transmitter, press the On/Off button on the fascia display
panel. If the unit responds to the On/Off button receiver is
OK. Check transmitter.
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POSSIBLE CAUSES/REMEDIES
MAXIMUM PUMP LIFT EXCEEDED. Check that the condensate pump head is no greater than 18” (See installation
section of this manual for more information).
BLOCKED/KINKED CONDENSATE PIPE. See section “Water Leaking From Unit.”
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TROUBLESHOOTING SECTION
CONDENSATE PUMP BLOCKED OR FAILED. See section “Water Leaking From Unit”
HIGH CONDENSATE LEVEL TRIP. Drain the condensate
tray and investigate. See section “Condensate high Level/”
erating pressures. Check filter condition. (See maintenance
instructions for more information).
COIL FREEZE UP. A coil freeze condition may have caused
excessive condensate to collect in the drip tray. See section “Freeze Protection.”
SENSOR FAILURE (MICRO UNITS ONLY). If any of the
sensors are faulty the microprocessor will disable the cooling operation.
COIL FREEZE
POSSIBLE CAUSES/REMEDIES
OUTDOOR UNIT TRIPPED. Check outdoor unit. refer to
outdoor unit troubleshooting section.
COOLING COIL FREEZE PROTECTION THERMOSTAT
TRIPPED (AUTO-RESET WHEN FREEZE CLEARED).
Freeze stat is normally closed, opens during freeze. Where
fitted, the stat will disable cooling action (sometimes the
entire system) during coil freeze conditions. Use the unit’s
wiring schematic to investigate.
FAULTY VALVE ACTUATOR (CHILLED WATER UNITS
ONLY). Check cooling signal present at actuator. Check
actuator by manually opening the valve. Replace actuator if
necessary.
NO HEATING (HEAT PUMP)
CONDENSING UNIT RUNNING WITH CASSETTE UNIT
SWITCHED OFF (DX SYSTEMS ONLY). System installed
such that it is possible for condensing unit to run with Cassette unit switched off. Check system wiring and disconnect switches.
POSSIBLE CAUSES/REMEDIES
INCORRECT MODE SETTING (MICRO UNITS ONLY).
Check that the transmitter MODE is set to Heat or Auto
Mode.
DIRTY OR BLOCKED AIR FILTER. Clean/replace filters as
necessary. (See maintenance instructions for more information).
JUMPER LINK SETTINGS INCORRECT (MICRO UNITS
ONLY). Check that JMP2 jumper link header on the microprocessor is in the “ON” position. Remove power before
making changes.
SYSTEM HEAD PRESSURE SET TOO LOW. Check condensing pressure, installation of low ambient kit may be required.
SET POINT TOO LOW. Check the set point on the transmitter or wall mounted thermostat and adjust if necessary.
LOSS OF REFRIGERANT. Check system for refrigerant
leaks and repair before recharging.
DEFROST MODE. Unit is defrosting the outdoor coil. Heating will continue automatically after defrosting.
NO COOLING
COMPRESSOR PROTECTION DELAY (MICRO UNITS
ONLY). Check that the green On/Off Led is not flashing. If it
is flashing wait for a maximum of 10 minutes then re-check
if heating is operating.
POSSIBLE CAUSES/REMEDIES
INCORRECT MODE SETTING (MICRO UNITS ONLY).
Check that the transmitter MODE is set to Cooling or Auto
Mode.
COMPRESSOR PROTECTION DELAY (ELECTRO-MECHANICAL DX UNITS ONLY). Wait for ten minutes and
then re-check if cooling is operating
SET POINT TOO HIGH. Check the set point on the transmitter or wall mounted thermostat and adjust if necessary.
OUTDOOR UNIT TRIPPED – Refer to outdoor unit troubleshooting section.
COMPRESSOR PROTECTION DELAY (MICRO UNITS
ONLY). Check that the green On/Off LED is not flashing. If it
is flashing, wait for ten minutes then recheck if cooling is
operating (Applies to chilled water units also).
INDOOR COIL TEMPERATURE TOO HIGH (MICRO UNITS
ONLY) – Check refrigerant charge by measuring operating
pressures. Check filter condition (See maintenance instructions for more information).
COMPRESSOR PROTECTION DELAY (ELECTRO-MECHANICAL DX UNITS ONLY). Wait for ten minutes and
then recheck if cooling is operating.
DIRTY OR BLOCKED AIR FILTER. See section “Coil
Freeze.”
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TROUBLESHOOTING SECTION
NO HEATING (Electric Heat)
FANS WILL NOT RUN
POSSIBLE CAUSES/REMEDIES
POSSIBLE CAUSES/REMEDIES
INCORRECT MODE SETTING (MICRO UNITS ONLY) –
Check that the transmitter Mode is set to Heat or Auto Mode.
LOOSE WIRE – Check all fan wire connections. Use unit’s
electrical schematic to verify that fan is wired correctly.
SET POINT TOO LOW – Check the set point on the transmitter or wall mounted thermostat and adjust if necessary.
FAULTY FAN CAPACITOR – Check fan capacitors, replace
if necessary.
OVERHEAT CUT OUT TRIPPED – (See section “Electric
Overheat.”)
FAULTY FAN MOTOR – Check fan motor protector for open
circuit, replace if necessary.
Investigate cause of over heat condition.
ELECTRIC OVERHEAT
• Possible low airflow, check filter condition. (See
maintenance instructions for more information).
• Possible fan failure. Check fans. (See section “Fans Will
Not Run”)
The electric heat circuit contains one automatic reset and
one manual reset overheat cut-out protection switch for each
electric heat element fitted to the unit. The cut-outs are wired
in line with the mains power flowing in each element and
operate as described below.
Remove power from unit and reset manual overheat cut-out
by rubbing. DO NOT PRESS!!
AUTO CUT-OUT: If the auto cut-out trips, the electric heat is temporarily disabled until the unit temperature falls and causes the overheat cut-out to
automatically reset.
Consult EMI technical support for instruction if necessary.
HEATER ELEMENT FAILED – Investigate and replace if
necessary.
POSSIBLE CAUSES/REMEDIES
MANUAL CUT-OUT: If the manual cut-out trips, the
electric heat is disabled until the unit temperature
falls and the overheat cut-out is manually reset. It
will typically take five minutes for the unit temperature to fall sufficiently to allow the cut-out to be reset. The cut-out should only be reset by a qualified
and competent electrician and with the main power
switched off. Ensure the elements have cooled sufficiently.
INCORRECT MODE SETTING (MICRO UNITS ONLY) –
Check that the transmitter MODE is set to Heat or Auto
Mode.
! WARNING !
FAULTY HEATER RELAY – Check signals to relay and
check action of relay contacts. Replace relay or PCB if necessary.
NO HEATING (Hot Water)
THIS EQUIPMENT CONTAINS LIVE ELECTRICAL AND
MOVING PARTS. ISOLATE ALL ELECTRICAL EQUIPMENT BEFORE ANY MAINTENANCE WORK IS CARRIED OUT!!
SET POINT TOO LOW – Check the set point on the transmitter or wall mounted thermostat and adjust if necessary.
BLOCKED OR DIRTY FILTERS CAUSING LOW AIRFLOW
– Check filter condition (See maintenance instructions for
more information).
NO HOT WATER/PUMPS FAILED – Check hot water source
and supply to unit.
FAULTY VALVE/ACTUATOR – Check actuator by manually opening and closing valve, replace if faulty.
FAULTY HEATER RELAY – Check signals to relay and
check action of relay contacts. Replace relay or PCB if necessary.
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MAINTENANCE
EVERY 3 MONTHS: Check the air filter condition and clean
if necessary (see below).
3. Remove the electrical panel lid and disconnect the
fan connections from within the electrical panel.
EVERY 6 MONTHS: Same as 3 months plus clean condensate tray with biocide suitable for polystyrene and clean fascia.
4. Rotate the fan by hand until two M6 nuts are visible
through the fan mounting access holes. Remove
the two nuts.
EVERY 12 MONTHS: Same as 6 months plus check all
electrical connections for security, check condensate pump
operation, and check the heating and cooling action to ensure proper operation.
5. Rotate the fan 90° until the remaining two nuts are
visible and remove while supporting the fan to prevent it from falling. The fan can now be dropped
down from the unit.
FILTER REMOVAL AND CLEANING
CONDENSATE TRAY REMOVAL
1. Ensure the unit is isolated from the electrical supply and ensure that the fan(s) has come to a complete stop.
1. Unclip the grille catches and remove the grille(s)
from the fascia.
2. Unclip the catches along the edge of each grille
and allow them to hang from the fascia by the
molded plastic hinges located along the opposite
edge.
2. Remove the fascia by loosening the fascia mounting bolts and sliding the fascia horizontally until it
releases from the chassis. If unit is microprocessor controlled, remove display panel cable
from within the electrical panel before removing the fascia.
3. If desired, the grilles can be removed from the fascia completely.
3. Remove electrical panel lid by unscrewing the single
self tapper and pull the lid horizontally away from
the control box.
4. The filter can now be easily slid out of the small
plastic retaining clips on the back of each grille.
4. On medium and large sized units, disconnect the
main wiring from the incoming terminal block and
disconnect the fan wires from their connection points
within the electrical panel. Separate any two part
connectors coming from the electrical panel.
5. Gently vacuum clean the filters on a medium power
vacuum.
6. Replace filters by reversing steps 2 to 4.
NOTE: EMI recommends you keep at least one full
set of cassette air filters as spares.
5. Drain the condensate tray by removing the small
black rubber drain plug, catching any condensate
in a suitable container.
FAN REMOVAL
6. Remove the self tapping screws securing the two
insulated metal condensate tray support channels
and pull the channels away from the condensate
tray. Pull the condensate tray, complete with inlet
ring (on medium and large sized units only) downwards away from chassis.
CAUTION: Isolate from the electrical supply before
commencing work!!
1. Unclip the grille catches and remove the grille(s)
from the fascia.
2. For medium and large-sized units, remove the M6
screws from the black plastic inlet ring and pull the
inlet ring downwards from the condensate tray. For
small units only, remove the fascia by loosening
the four fascia mounting bolts and then slide the
fascia horizontally until it releases from the chassis. Drain the condensate tray by removing the
small black rubber drain plug, catching the condensate (if any) in a suitable container. Remove
the self tapping screws securing the two insulated
metal condensate tray support channels and pull
the channels away from the condensate tray. Pull
the condensate tray downwards away from the chassis.
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CONDENSATE PUMP REMOVAL
1. Disconnect condensate pump and float switch wires
from inside electrical panel.
2. Unscrew the three M4 screws holding the pump
inspection plate in place and pull the pump and
mounting bracket away from the chassis while feeding the pump wires between condensate tray and
insulation.
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APPENDIX A - WIRING CHARTS AND INSTRUCTIONS
TERMINAL BLOCK INSTRUCTION FOR THE
CONNECTION OF HIGH/LOW VOLTAGE WIRES
When connecting line and/or low voltage wires to
the CAH terminal block(s) a 3/32-screw driver
(thermostat type) is required.
1. Insert the screwdriver into the square hole until
you “hit bottom.” This will open the terminal
block so that it will accept your wire(s).
2. Insert the stripped wire into the oval or round
hole.
3. Remove screwdriver to allow the terminal block
to “clamp down” on the wire(s).
IT IS EXTREMELY IMPORTANT THAT THE WIRE(S)
ARE CONNECTED PROPERLY OTHERWISE ARCING
MAY RESULT IN ELECTRICAL DAMAGE OR FIRE!
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APPENDIX B - EXPLODED UNIT DRAWING AND PARTS LIST
SMALL CABINET
• CAH 9,000 - 12,000
• CAHW 9,000 ONLY
• CAF 8,000 - 12,000
• CAF4 8,000 ONLY
22
1
6
8
7
20
21
2
14
3
10
9
18
19
5
4
10
12
13
16
11
23
17
1. Cassette Chassis
2. Evaporator Assembly
3. Electric Heater Element Assembly
4. Condensate Tray
5. Condensate Tray Supports (2)
6. Condensate Pump
7. High Level Switch
8. Condensate Pump Assembly
9. Fan/Motor Assembly
10. Coil/Return Air Sensors
11. Grille
12. Label
13. Air Deflector Vanes (4)
14. Freeze Protection Thermostat (DX Electro-Mechanical Version only)
15. Filter
16. Fascia Assembly
17. Receiver (Microprocessor Version)
18. Terminal Rail, Relays & Timer (Micro & Electro-Mechanical Version)
19. Control Box Lid
20. Control Box
21. PCB Controller (Microprocessor Only)
22. Coil Support Brackets
23. Remote Handset (Microprocessor Only)
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APPENDIX C - EXPLODED UNIT DRAWING AND PARTS LIST
MEDIUM CABINET
1
• CAH 15,000 - 24,000
• CAHW 12,000 - 24,000
• CAF 18,000 - 20,000
• CAF4 12,000 - 20,000
5
6
LARGE CABINET
2
• CAH/W 30,000 - 48,000
• CAF/4 33,000 - 36,000
20
19
3
7
4
18
9
8
10
11
17
16
12
1. Cassette Chassis
2. Evaporator Coil
3. Condensate Tray
4. Condensate Tray Support
5. Condensate Pump
6. High Level Switch
7. Fan & Motor Assembly
8. Fan Inlet Ring
9. Grille
10. Infrared Receiver
11. Vane
12. Vane Motor Assembly
13. Filter
14. Fascia
15. Remote Handset
16. Control Box Lid
17. Control Box PCB
18. Control Box
19. Coil Bracket
20. Expansion Valve
13
14
15
Enviromaster International LLC
5780 Success Drive, Rome, NY 13440
Phone: 1-800-228-9364 / FAX: 1-800-232-9364
Email: emi@enviromaster.com
Web: http://www.enviromaster.com
ENVIROMASTER INTERNATIONAL LLC
20
EMI@ENVIROMASTER.COM