2
2. Service and maintenance of this equipment should only
be carried out by skilled personnel.
3. 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.
4. Also ensure that there are no other power feeds to the
unit such as fire alarm circuits, building management
system (BMS) circuits, etc.
5. Electrical installation, start-up and maintenance work on
this equipment should be undertaken by competent and
trained personnel in accordance with local relevant stan-
dards and codes of practice.
Fig. 1 — Proposition 65 Warning Label
INSPECTION
1. Inspect unit upon arrival. In case of damage, report
immediately to transportation company and your local
factory sales representative.
2. Check rating plate on unit to verify that the power supply
meets available electric power at the point of installation.
3. Inspect unit received for conformance with description of
product ordered (including specifications where applicable).
GENERAL
The 42WKN ceiling cassette units effectively make each area
served an independently controlled temperature zone. Through
thermostatic control of operations, conditions can be varied to
suit diverse requirements or activities. Optional controls, plus
outside and return-air connections, are available to provide for
ventilation and recirculation of room air.
The 42WKN hydronic fan coil unit water connections are
fixed to the unit body to avoid breaks when the pipes are con-
nected. The upper coil connection is supplied with an air purge
valve; the lower connection is supplied with a water purge valve.
Minimum entering water temperature for the water circuit is
39°F; maximum is 180°F. If room temperature goes down to
32°F or lower, it is advisable to empty the water circuit to avoid
the potential for ice breaks.
Refer to Table 1 for unit physical data and Fig. 2-4 for unit di-
mensional data.
DANGER
Appliances must not be installed where they may be ex-
posed to potentially explosive or flammable atmosphere.
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, injury or
death. Read the installation, operating and maintenance
instructions thoroughly before installing or servicing
this equipment.
WARNING
Disconnect power supply before making wiring connec-
tions to prevent electrical shock and equipment damage.
All appliances must be wired strictly in accordance with
the wiring diagram furnished with the appliance. Any
wiring different from the wiring diagram could result in
a hazard to persons and property.
CAUTION
Any original factory wiring that requires replacement
must be replaced with wiring material having a tempera-
ture rating of at least 105°C.
Ensure that the supply voltage to the appliance, as
indicated on the serial plate, is not more than 5% over
rated voltage or less than 5% under the rated voltage.
When servicing or repairing of this equipment, use only
factory-approved service replacement parts. Refer to the
rating plate on the appliance for complete appliance
model number, serial number and company address.
Any substitution of parts or controls not approved by the
factory will be at the owner's risk.
Do not attempt to reuse any mechanical or electrical con-
trollers which have been wet. Replace defective controller.
IMPORTANT: Make sure the ceiling grid is supported
separately from the appliance. The ceiling must not be
supported by any part of the appliance, fascia or any as-
sociated wiring or pipe work.
Start-up and adjustment procedures should be performed
by a qualified service agency.
