S-Series Technical Manual
79
Cambridge Air Solutions
MAINTENANCE INSTRUCTIONS
m
WARNING:
Turn the disconnect switch off when performing
service or maintenance functions.
BLOWER BEARING LUBRICATION
Heaters with 3 HP or smaller motors have
permanently lubricated, double shielded and double
sealed ball bearings which do not require additional
lubrication. Heaters with 5 HP or larger motors
require lubrication on intervals of 3 to 6 months. Use
Duralube AW-2G, Goldplex (Lithplex HC 150 SMG),
Shell Gadus S2V100 2 or Mobilith AW2 grease.
Grease should be bearing quality and compatible to
lithium bases thickener.
MOTOR BEARING LUBRICATION
Motors are pregreased normally with Exxon Polyrex
EM. Equivalent greases which are compatible with
the Exxon Mobil lithium complex greases and electric
motor polyurea greases per ASTM D6185.
Annual Motor
Operation
Recommended
Lubrication Interval
NEMA 215T
Frame or
smaller
NEMA 254
Frame or
larger
Intermittent Operation -
>5000 hours
5 years
3 years
Continuous Operation -
Standard Service
2 years
1 year
Seasonal Service
(Motor is idle for 6
months or more)
1 year
Continuous Operation -
Severe Service
(High ambient, dirty
or moist location, high
vibration)
6 months
FILTERS
Filters may be provided in a V-bank filter section.
Filters may be of the disposable or permanent type.
Service the filters as needed based on the ”loading”
experienced. Clean filters typically start out with a
pressure drop across the filters between 0.15 and 0.25”
WC. Cleaning or replacement is generally required
below the pressure drop increased by a factor of 4
times the initial clean value.
Turn off the heater before servicing the filters.
Remove the filters from the filter section by opening
the filter access door. Handle the filters carefully to
prevent debris from being dislodged from the filter
into the heater.
Permanent Filters are 2” thick expanded aluminum
washable filters in aluminum frames.
Permanent filters can be cleaned using a stream of
water or soap and water. Back flush the filters until
the water comes out clean. If soap is used, ensure that
all soap is rinsed out of the filter. Visually inspect the
filter to ensure that it is clean. Allow to dry before
returning to service.
Disposable Filters are 2” thick cotton/polyester
panels with galvanized expanded metal pleat support
grids and beverage board frames.
Disposable filters are replaced when they become
dirty. Replace the filter with the same size of filter
which is removed from the filter section. Note the
airflow markings on the filter.
Model
Quantity
Size
S400/S800
2
20” x 25” x 2”
S950/S1200/S1600
4
20” x 25” x 2”
S1850/S2200/S3200
12
16” x 25” x 2”
