EMI WLCA User Manual

SAFETY: The equipment has been designed and manufac-
tured to meet international safety standards but, like any
mechanical/electrical equipment, care must be taken if you
are to obtain the best results.

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.

3. Also ensure that there are no other power feeds to the

unit such as fire alarm circuits, BMS circuits, etc.

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.

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.

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) ver-
sions; 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, elec-
tric 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 work-
ing environment.

LOW VOLT TRANSFORMER (Standard): 24 Volt.

ELECTRO-MECHANICAL (Standard): Thermostat options
are cooling only, cooling and one stage auxiliary heat, cool-
ing 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.

MICROPROCESSOR (Optional): A custom designed mi-
croprocessor is fitted to the cassette to enable room condi-
tions to be maintained at a user defined setpoint. Communi-
cation to the controller is by a hand held infrared transmitter,
which includes a wall mounting bracket as standard.

The microprocessor allows five operating modes. These
modes are - fan only, dry cooling, cooling only, heating only
and heating/cooling auto changeover for maximum versatil-
ity. A temperature setpoint between 58°F - 90°F can also be
selected.

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 in-
door unit that defrost of the outdoor coil is taking place. This
allows the same micro to control both heat pump and cool-
ing only units. The receiver contains a self diagnostic fea-
ture. When a low indoor coil temperature is detected the
cooling action is stopped. If a sensor fails then an alarm is

P/N# 240-4235 Rev. 1.6 [1/05]

CAH/CAHW: 9,000 - 48,000 Btuh

CAF/CAF4: 8,000 - 36,000 Btuh