Trane UHSB Installation, Operation And Maintenance Manual page 56

Table 42. Troubleshooting Guide
Symptoms
A. Leaking coil
B. Poor output on steam
C. Poor output on steam or hot water
D. Noisy or vibrating unit
Table 43. Unit Equipment Start-Up
Customer____________________________________________
Type of equipment: Unit Heater
Serial Number________________________________________
Name Plate Voltage___________________________________
Steam______________________________________________
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?
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
56
Maintenance
Possible Cause(s)
1. Frozen coil.
2. Defective coil.
3. Corrosion.
4. Leak in joint.
1. Check for air in coil.
2. Lint on coil fins
1. No circulation of water through coil.
2. Short cycling of motor.
3. Backward rotating motor.
1. Damaged fan blade.
2. Dirty fan blade.
Job Name & Number___________________________________
Pre-Inspection Information (with power off)
Model Number________________________________________
Name Plate Amperage_________________________________
Hotwater____________________________________________
the four panel mounting bolts. See
Figure 58.
Figure 58. Cross Section View
Corrective Action
1. Replace.
2. Replace.
3. Replace
4. Braze joint if joint is exposed where leak has
occurred.
1. Repair or replace thermostatic air vent.
2. Clean coil and fins. Check filter and clean.
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.
1. Change fan blade.
2. Clean fan blade.
Top
Panel
Bottom
Panel
Fan Guard
Mounting Screws
Panel Mounting
Bolts
UH-SVX01A-EN