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Installation & Service Manual NSSD
March, 2002 Page 15
1. Remove bottom trays (1) from case (2).
2. Unclip and lift up fan plenum (3).
3. Disconnect and remove defrost heater (4)
from mounting clips (5) and case (2).
4. Install new defrost heater (4) in reverse
order.
5. Restore electrical power to case.
Rear Ballast Location Replacement
1. Remove screws (1) and rear rail cover (2)
from rear of case.
NOTE
If tappit screws are not available, a star-
washer should be used between the bal-
last and the heads of the screws.
2. Install required number of ballasts (3) in
rear electrical raceway (4) with two
screws (5) each.
3. Identify and connect required wiring har-
nesses (upper, lower, etc...) to the ballast
connectors (6).
4. Replace rear rail cover (2) and secure
with screws (1).
Defrost Heater Replacement
WWAARRNNIINNGG
Always shut off electricity to case before
replacing a defrost heater. Automatic
cycling of fans or electrical power to wire
ends could cause personal injury and/or
death.