M-Series Technical Manual
29
Cambridge Air Solutions
IMPORTANT
Before attempting electrical installation, review the
following instructions and wiring and connection
diagrams to make sure you have a thorough
understanding of what is required.
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.
1. Check the heater nameplate to determine the voltage
and amperage requirements.
CAUTION:
If the supply voltage does not agree with the
nameplate voltage, notify your local agent or
Cambridge Air Solutions’ Customer Service Group
at 800-473-4569.
WARNING:
For roof mounting, the gas and electrical
connections must not penetrate the unit base
or mounting curb. Cambridge Air Solutions
recommends using pitch pockets or roof boots to
seal the penetrations.
2.
Wire the supply wiring and adequate Branch Circuit
Protection in accordance with the National Electric
Code ANSI/NFPA 70.
3. Mount the Remote Control Station in a location inside
of the building and convenient to the operator without
being susceptible to damage.
4. Space temperature sensors are normally located
along a perimeter wall and out of the direct path
of the discharge air or air infiltration. Consult
the design drawing or your local Cambridge Air
Solutions Representative for placement assistance.
Do not locate the remote mounted temperature
sensors immediately adjacent to overhead doors
because the infiltration air can affect the sensor when
the door is closed and may not adequately sense the
temperature when the door is open. In dock areas,
the sensor should be located on the first column in
from the outside wall.
IMPORTANT
Observe the special notes and instructions on
the wiring diagrams including the following:
The wiring for the space temperature
sensors must be shielded, twisted-pair
wiring and must be run separately from
the other line voltage AC wiring. This also
applies to other remotely mounted controls
utilized in the Maxitrol Series 14 and 44
control systems. Shielded wire which is
routed to the electrical control enclosure
on the heater should extend beyond the
high voltage section of the enclosure before
the shielding is removed and the wiring
is distributed to its ultimate destination.
Shielding must be grounded on one end
only.
IMPORTANT
Conduit connections for power and control
wiring must be caulked to ensure a tight seal
and prevent moisture accumulation.
5. Wire the Remote Control Station and other
temperature control options using Class 2 wiring
per Cambridge Air Solutions wiring diagram and
National Electrical Code Article 725 or local codes.
6. Run conduit and primary wiring to the disconnect
switch inside of the control enclosure on the heater
per N.E.C., Article 430, ANSI/NFPA 70.
7. If applicable on vertical mount, feed the damper
wiring cable from the gas train enclosure to the
damper actuator J-box. Follow the instructions
provided that are attached to the cable. Connect
wiring to the damper motor junction box per the
wiring diagram.
8. Return the wiring diagram to the manual holder.
Replace and fasten all access covers.
CAUTION:
Do not attempt to start the make-up air heater
at this time.
Premature start-up can result in damage to the
equipment and components.
INSTALLATION INSTRUCTIONS
ELECTRICAL
