SA-Series Technical Manual
13
Cambridge Air Solutions
INSTALLATION INSTRUCTIONS
ELECTRICAL WIRING
IMPORTANT
Before attempting electrical installation, review the
following instructions and the wiring and connection
diagrams to make sure you have a thorough
understanding of the requirements.
WARNING:
High voltage electrical input to this equipment is
required. Extreme caution should be exercised.
This equipment must be electrically grounded in
accordance with local codes or in accordance with
National Electrical Code ANSI/NFPA No. 70 or the
Canadian Electrical Code C22.1.
1. Check the heater nameplate to determine the
voltage and amperage requirements.
IMPORTANT
Do not proceed with installation unless the supply
voltage agrees with the nameplate voltage. If supply
voltage does not agree with nameplate voltage, check
with your local agent or Cambridge Air Solutions
Customer Service Group at
1-800-473-4569
to
determine what changes are required.
2. Install the supply wiring and adequate Branch
Circuit Protection in accordance with National
Electric Code ANSI/NFPA 70 or Canadian
Electrical Code C22.1.
3. Mount the remote control station. This panel
should be located inside of the building and
convenient to the operator without being
susceptible to damage.
4. Any temperature sensors should be located along
a perimeter wall and out of the direct path of
the discharge air or air infiltration. Consult the
design drawing and/or Cambridge’s Customer
Service Group for placement assistance. Do
not locate remote mounted temperature sensors
immediately adjacent to overhead doors because
infiltration air can affect the sensor when the door
is closed and the sensor may not adequately sense
the temperature when the door is open. In this
application, the sensor should be located on the first
column in from the outside wall.
CAUTION:
Observe special notes and instructions on Wiring
and Connection Diagrams regarding sensor
installation.
The wiring for any temperature sensors mounted
remote from the remote control station must be
shielded, twisted-pair wiring and must run separate
from other AC wiring.
If the thermistor is not mounted remote from the
remote control station, trim the excess wire length
from the thermistor, as required.
Shielded wire which is routed to the heater’s electrical
control enclosure should extend beyond the high
voltage section of the enclosure before the shielding is
terminated and the wiring is distributed to its ultimate
destination.
Shielding must be grounded at the remote control
station end only.
5. Wire the remote control station and other
temperature control options using Class II wiring
per the Cambridge wiring diagram and National
Electrical Code Article 725 or Canadian Electrical
Code C22.1 section 16 or local codes.
6. Connect the supply wiring to an electric
disconnect switch (by others) having adequate
ampacity per National Electrical Code, Article
430, ANSI/NFPA 70 or Canadian Electrical
Code C22.1 Sections 12 and 28. See the heater
nameplate for voltage and ampacity requirements.
IMPORTANT
Power and control wiring inlets on all outdoor units
must be sealed with silicone caulk to prevent moisture
accumulation.
7. Return the wiring diagram to the manual holder.
Replace and fasten all access covers.
WARNING:
Do not attempt to start unit at this time.
Premature start-up can result in damage to
equipment and components.
