Filter
Top Products
56 UH-SVX01A-EN
Maintenance
Additional "P" Model
Instructions
Fan and Motor Assembly
For cleaning or maintenance
purposes, the fan and motor
assembly may be removed easily
from the Unit Heater. The motor is
attached to the fan guard which is, in
turn, mounted to the top or back
panel of the unit as shown in
Figure 58.
On Vertical Units, reach up through
the fan and remove the fan guard
mounting screws. Lower the motor,
fan and fan guard assembly down
through the fan outlet. If desired, the
top and bottom panels may be
removed from the coil by taking out
Table 42. Troubleshooting Guide
Symptoms Possible Cause(s) Corrective Action
A. Leaking coil 1. Frozen coil.
2. Defective coil.
3. Corrosion.
4. Leak in joint.
1. Replace.
2. Replace.
3. Replace
4. Braze joint if joint is exposed where leak has
occurred.
B. Poor output on steam 1. Check for air in coil.
2. Lint on coil fins
1. Repair or replace thermostatic air vent.
2. Clean coil and fins. Check filter and clean.
C. Poor output on steam or hot water 1. No circulation of water through coil.
2. Short cycling of motor.
3. Backward rotating motor.
1. Check circulation pump. Check for blocked tubes.
2. Check voltage and correct. Check for linted coil and
clean. Check for defective overload and repair or replace
motor.
3. On single phase motor replace motor. On three phase
motor, reverse two leads to change rotation.
D. Noisy or vibrating unit 1. Damaged fan blade.
2. Dirty fan blade.
1. Change fan blade.
2. Clean fan blade.
Table 43. Unit Equipment Start-Up
Customer____________________________________________ Job Name & Number___________________________________
Pre-Inspection Information (with power off)
Type of equipment: Unit Heater
Serial Number________________________________________ Model Number________________________________________
Name Plate Voltage___________________________________ Name Plate Amperage_________________________________
Steam______________________________________________ Hotwater____________________________________________
Questions/Checklist
Are all panels in place?
Has the unit suffered any external damage? If so, what:____________________________________________________________
Does the piping and electric wiring appear to be installed in a professional manner?
Has the piping and electric been inspected by the local authority having jurisdiction?
Is the supply properly sized for the equipment?
Were the installation instructions followed when the equipment was installed?
Have all field installed controls been installed?
Do you understand all the controls on this equipment?
the four panel mounting bolts. See
Figure 58.
Figure 58. Cross Section View
Fan Guard
Mounting Screws
Top
Panel
Panel Mounting
Bolts
Bottom
Panel