22
Fig. 32 — 42SM Unit Knockout Locations
Top View (Typical)
Fig. 33 — 42SM Unit Supply Air Knockout Tab
Location
Fig. 34 — 42SM Unit Supply Air Installation
10. Use adhesive or glue to re-attach insulation that has
pulled away from the unit during knockout removal
process.
11. For ducted applications, tape should be applied along
and around all of the supply air opening knockouts to
prevent air leakage.
Step 2 — Make Electrical Connections
Refer to unit nameplate for required supply voltage, fan and
heater amperage, and required circuit ampacity. Refer to unit
wiring diagram for unit and field wiring. Since each project is
different and each unit on a project may be different, the in-
staller must be familiar with the wiring diagram and name-
plate on the unit before beginning any wiring. Make sure all
electrical connections are in accordance with unit wiring dia-
gram and all applicable codes. The type and sizing of all wir-
ing and other electrical components such as circuit breakers,
disconnect switches, etc. should be determined by the indi-
vidual job requirements, and should not be based on the size
and/or type of connection provided on the equipment. All in-
stallations should be made in compliance with all governing
codes and ordinances. Compliance with all codes is the re-
sponsibility of the installing contractor.
The fan motor(s) should never be controlled by any wiring or
device other than the factory-supplied switch or thermostat/
switch combination unless prior factory authorization is ob-
tained. Fan motor(s) may be temporarily wired for use during
construction only with prior factory approval and only in
strict accordance with the instructions issued at that time.
The unit electrical supply is designed to enter through knock-
outs provided in the top of the unit and pass down through
matching knockouts in the control section top. Where space
allows, power may be pulled directly through the side of the
cabinet into the control section.
All components furnished for field installation by either the
factory or the controls contractor should be located and
checked for proper function and compatibility. All internal
components should be checked for shipping damage, and any
loose connections should be tightened to minimize problems
during start-up.
Any devices such as fan switches or thermostats that have
been furnished from the factory for field installation must be
wired in strict accordance with the wiring diagram that ap-
pears on the unit. Failure to do so could result in personal in-
jury or damage to components, and will void all manufactur-
er's warranties.
The manufacturer assumes no responsibility for any damages
and/or injuries resulting from improper field installation and/
or wiring.
FACTORY-INSTALLED OPTIONS
Condensate Overflow Switch
The condensate overflow switch is used to detect a clogged
condensate drain pan. The condensate switch uses a normally
closed contact to allow the system control power to pass
through the switch energizing the water valves and fans al-
lowing normal operation. When an overflow condition is de-
tected by the switch, it opens the NC contact and de-energizes
the water valve and fans.
Aquastat
The aquastat must be able to sense whether the flowing water
is being chilled or heated and switches a contact closed to pro-
vide automatic summer or winter changeover for the system.
When a two-pipe cooling/heating system with optional auxilia-
ry electric heat is desired, an additional aquastat is required.
If the valve package is field-supplied, the aquastat must be in-
stalled in a location where it will sense the water temperature
regardless of control valve position. A bleed bypass should be
provided for proper operation of aquastat. The bleed line al-
lows a small amount of water to flow from supply to return
piping when the control valve is closed for loop temperature
sensing.
All field wiring must be in accordance with governing codes
and ordinances. Any modification of unit wiring without fac-
tory authorization will invalidate all factory warranties and
nullify any agency listings. The manufacturer assumes no re-
sponsibility for any damages and/or injuries resulting from
improper field installation and/or wiring.
Units may be equipped with line voltage controls or 24 vac
control systems. The following descriptions are for typical
control sequences only. For detailed control operating se-
quence, refer to thermostat operating instructions.
TOP SUPPLY
AIR KNOCKOUT
TOP VIEW
ELECTRICAL
KNOCKOUTS
KNOCKOUT TAB
10 PLACES
DUCT BREAK
4 PLACES
KNOCKOUT TAB
TRIM LINE
UNIT
WALL
UNIT
INSULATION
90º
DUCT FLANGE
IMPORTANT: Refer to unit wiring label for specific func-
tions. Standard wiring diagram configurations are main-
tained in separate Fan Coil Wiring Diagram literature. Re-
fer to unit wiring label for specific functions.
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