Installation and Maintenance Manual

Maintenance
UV-SVN02C-EN 87
reservoir to the bearing surface without the use of grooves
or holes in the inner bearing surface. Do not alter the inner
bearing in any way.
Fill the bearing reservoir every six months with a
No. 10 SAE, non- detergent, automotive type oil.
Motor
The fan motor is an electronically commutated motor.
To replace the fan motor, complete the following steps:
1. Turn off power to the unit and remove the front cover.
2. Complete steps for return air grille and filter removal.
3. Complete steps for removal of drain pan if face and
b
ypass option is installed.
4. Complete steps for removal of fan board.
5. Disconnect the motor ground wire.
6. Using a 7/16-in. Allen wrenc
h, loosen the coupling on
the fan shaft.
7. Loosen the screw on the motor clamp until it allow the
motor to be lifted off the base.
8. Lift the motor and pull forward until fan shaft separates
from the motor.
9. Attach new motor to fan shaft and reverse steps to
complete installation.
Modulating Valves (3-Wire Floating)
The valve should be services by a trained, experienced
technician. For detailed installation and removal steps,
refer to “Modulating Water Valves (Option),” p. 24 in this
manual.
For general servicing or malfunction, follow one of the
appropriate steps:
1. If the valve is leaking, drain system OR isolate valve
from the system. DO NOT remove valve body from
plumbing.
2. Check to see if the cartridge ne
eds to be replaced. If so,
follow appropriate steps explained for cartridge
assembly removal.
3. If the motor or other interna
l parts of the actuator is
damaged, replace the entire actuator assembly.
Notes:
• These h
ydronic valves are designed and tested for
silent operation. However, water noise may occur as a
result of high water velocity. Piping noises may also
occur in high temperature (over 212°F) systems with
insufficient water pressure.
• Do not use petroleum-based or mineral oil type boiler
additives. Compounds with a 50-percent water dilution
that can be used are diethylene glycol, etheylene glycol
and propylene glycol.
Preventive Maintenance
A comprehensive preventive maintenance program
should be established for a unit ventilator system. The
following are several key elements:
• Inspect the filters monthly.
• Inspect and clean the drain pans every three months.
• Check the coils for “dirt” accum
ulation every three to
six months.
• Clean the coils at least once each year.
• Inspect the unit ventilator insulation every three
m
onths; thoroughly clean as needed.
UV-SVN02_-EN.book Page 87 Thursday, January 24, 2013 4:48 PM