Maintenance Instructions - Cambridge Engineering S Series Technical Manual

MAINTENANCE INSTRUCTIONS

mWARNING:
Turn the disconnect switch off when performing
service or maintenance functions.
BLOWER BEARING LUBRICATION
Heaters with 3 HP or smaller motors have permanent-
ly 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 thick-
ener.
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
Intermittent Operation -
>5000 hours
Continuous Operation -
Standard Service
Seasonal Service
(Motor is idle for 6
months or more)
Continuous Operation -
Severe Service
(High ambient, dirty or
moist location, high vibra-
tion)
Cambridge Engineering, Inc.
Recommended
Lubrication Interval
NEMA 215T NEMA 254
Frame or Frame or
smaller larger
5 years 3 years
2 years 1 year
1 year
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 "load-
ing" 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 pan-
els 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 air-
flow markings on the filter.
Model
S400/S800
S950/S1200/S1600
S1850/S2200/S3200
44
Quantity Size
2 20" x 25" x 2"
4 20" x 25" x 2"
12 16" x 25" x 2"
S-Series Technical Manual