Nailor Industries, Inc. reserves the right to change any information concerning product or specification without notice or obligation.
Field Wiring
All field wiring must comply with NEC and local codes. Disconnect
switches are optional. Wiring diagrams can be found on labels
affixed to the exterior/interior of the control box enclosure. Unless
specifically requested by customer, all units are wired for a single
point connection to the fan and electric heater (if present). All electric
heaters will be staged per specification. Motors rated for 277 or 120
VAC on units with 480 or 208 VAC ratings respectively are always
connected between the neutral and L1 terminals. The installing
electrician should rotate the incoming electric service by phase to
help balance the building electric load.
Fuse size designates the size of the internal fuse if it is supplied.
Maximum Overcurrent Protection (MOP) designates the largest
breaker or fuse in the electrical service panel that can be used to
protect the unit. See appendix A for calculation details.
Electrical Suggestions and Requirements
1. Provide a safety disconnect per NEC 424-19, 20, 21.
2. Disconnect the power supply before wiring or servicing unit. If
a disconnect switch is present, it should be in the OFF position
while making power connections or repairs.
3. All units with electric heat should have copper wires sized for
minimum circuit ampacity (MCA). See appendix A for calculation
details.
4. Follow wiring diagrams and instructions mounted on the unit.
480V/3 phase heaters, for example, require a neutral wire in
addition to the full sized ground wire. NEC 424-15 and 250 also
require that all units be grounded.
Water Pipe Connections
Exercise extreme caution during "sweating" or brazing process of coil
piping to avoid applying excessive heat to components associated
with valve package. This could cause irreversible damage, requiring
immediate replacement of parts. Make sure valves are in full open
position during brazing process. Heat can be dissipated more
effectively by wrapping a wet towel around the valve body during
the brazing process.
Make sure final piping configuration does not interfere with sensible
cooling coil and integral drip pan. Remove any residual air pockets
from inside the coil through available air vents. Once the coil has
been pressure tested, insulate piping and components as required
to prevent potential condensation issues.
Control Start-up and Operation
Your local Nailor Representative can provide detailed information
about start-up and operating procedures for Nailor’s digital, analog,
and pneumatic controls. For specific information on controls
provided by other manufacturers contact the control manufacturer’s
local or national office. This applies whether the controls were
factory or field installed.
Note:
Digital controllers may use specific communication
addresses based on Building Management Systems,
Architecture and original engineering drawings. Installing
the terminal in a location other than that noted on the label
may result in excessive start-up labor.
Primary Air Damper and Fan Adjustment
Before starting the fan motor:
a. If filters are required, make sure they are installed as intended.
b. Make sure duct system is clear of all debris and foreign objects.
c. Ensure unit enclosure, blower housing and blower wheel are free
of any debris and foreign objects.
Starting the fan motor:
1. Start motor and let it run-in at least 15 minutes. During run-in,
check ductwork connections for leaks and repair if necessary.
2. All 33SZ units are equipped with ECM motors. Set the primary
air dampers as described in (3). Set the fan as described on page
one of the IOM for EPIC Fan Volume Controller with (Genteq
EON) ECM Motor, found in the IOM section at www.nailor.com.
Proportion the dampers after the fan is set. Remember to adjust
the dampers so that they are in the most open condition after
proportioning. This will generate the minimum noise.
3. Set the unit to full cooling. Adjust and set primary maximum cfm
by measuring the airflow with a manometer attached between the
gauge ports in the pneumatic tube leading to the high and low
sides of the inlet air pick-up. A chart is attached to the side of the
unit showing airflow vs. pressure for different inlet sizes. Adjust
and set remote balancing dampers, if present. Do not worry about
airflow at this time; just proportion the outlets with the dampers.
Be sure to leave the dampers in the most possible open position.
This will generate the minimum noise level. Adjust the fan speed
control until the required CFM is obtained (by measuring the air
quantity at the room outlets). Fan should be adjusted with primary
air at maximum set point to ensure that no supply air is discharged
at the induction port. Recheck the fan and primary airflows when
the damper is reset to the minimum set point.
Maintenance Procedures
Warning: Electrical Hazard!
Before Servicing, disconnect all sources of electrical
power, including the complete discharge of any
electric current stored in capacitors included in the
wiring structure. Practice good lockout/tagout procedures
to prevent energizing of the unit during servicing. Failure to
comply with previous statements could yield personal injury
or even result in death.
Fan and Motor
Nailor 33SZ units are equipped with permanently lubricated motors.
Inspect fan and motor assembly for dust and dirt as often as dictated
by operating environment. Clean assembly if necessary.
If fan motor does not run, do the following:
a. Check for free rotation of blower wheel. Make sure no foreign
objects are in fan. Look for signs of freight or job site damage.
b. Check power supply. Disconnects should be in the "ON" position.
Optional fusing should also be inspected. Check transformer for
proper output.
c. Check for proper control signals.
Fan motor runs but emits excessive noise
a. Maximum airflow may be too high, or discharge static pressure
may be incorrect.
b. Blower may have clearance problems. Make sure all components
are securely attached.
c. Verify integrity of ductwork. Leaks or loose connections could
cause noise. Check for rattling diffusers or rattling or incorrectly
adjusted balancing dampers.
Fan motor runs, but airflow too low:
a. May be due to ductwork restrictions, dirty air filters or clogged.
b. Readjust fan speed control on control card.
c. Discharge static pressure may be incorrect. Check balancing dampers.
d. Confirm signal from the motor card to the motor by measuring the
plug at the motor.
If repair or replacement is required
Disconnect all power before servicing. Motor and fan should
be removed as an assembly. Remove the four hex nuts from
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