Display Cases 724, 7000, 9000 Series Service and Installation Manual
For customer service, call (800) 733-8829, (800) 773-8821, Fax (989) 773-3210, www.delfield.com
6
Display Cases 724, 7000, 9000 Series Service and Installation Manual
7
For customer service, call (800) 733-8829, (800) 773-8821, Fax (989) 773-3210, www.delfield.com
OPERATION
The units are self-defrosting. They do not require any manual
defrosting. During normal operation, the coil will defrost
automatically whenever the compressor is not operating.
In high humidity areas frost will accumulate on the coil,
reducing the heat transfer that takes place. When this occurs,
the system is designed to sense the frost build-up and shut
off the compressor, thereby allowing it to defrost. Under
these conditions, cabinet temperatures may be warmer than
normal. This is not cause for alarm, but merely indicative of a
properly functioning unit in high humidity conditions.
The unit is set at the factory to maintain between 36°F to
40°F (2°C to 4°C) and should require no adjustments on
initial start-up. If temperatures are not satisfactory adjust the
temperature control. Turning the knob clockwise will make
the cabinet colder.
The temperature control on the 9000 Series is located inside
the cabinet near the top.
The temperature control on the 7000 Series is located behind
the front louvered panel.
The temperature control on Model 724 units is on the back of
the unit in the top left hand corner.
Model 724 units have a main switch that shuts off the entire
unit. The light switch shuts off all three lights. The tempera-
ture control will shut off the condensing unit.
Cleaning the unit
The interior and exterior can be cleaned using soap and warm
water. If this is not sufficient try ammonia and water or a
non-abrasive liquid cleaner.
When cleaning the exterior, always rub with the “grain” of
the stainless steel to avoid marring the finish. Do not use an
abrasive cleaner because it will scratch the stainless steel and
plastic.
The sign insert on Model 724 units is easily removable for
cleaning or replacement:
1 Remove the screws that attach the
perforated top to the unit.
2 Lift off the perforated top and set it aside.
3 Facing the front of the unit, grasp the sign
securely and lift it up and out of the “U”-
shaped channel that holds it in place.
4 Clean with a mild soap and warm water,
and allow the sign to dry thoroughly.
5 Reinsert the sign into the “U”-shaped
channel.
6 Re-attach the perforated top with the
screws.
Doors
To remove the Pike
®
-style doors on the 7000 and 9000
Series, follow these steps:
1 Open the right-hand (outer) sliding door
about 2" to 4" (5 cm to 10 cm).
2 Lift the door vertically far enough to clear
the bottom track.
3 Pull the door towards you and remove it.
4 Repeat steps 1 through 3 for the left-hand
(inner) door.
Condensing unit
The power must be disconnected
before doing any maintenance to the
condensing unit. Failure to observe this
warning may result in electrical shock
and personal injury.
In order to maintain proper refrigeration performance, the
condenser fins must be cleaned of dust, dirt, and grease
regularly. It is recommended that this be done at least every
three months. If conditions are such that the condenser is
totally blocked in three months, the frequency of cleaning
should be increased.
Clean the condenser with a vacuum cleaner or stiff brush. If
extremely dirty a commercially available condenser cleaner
may be required.
Door gaskets
The door gaskets should be cleaned as required to main-
tain their ability to seal properly. Do not use sharp tools or
knives to scrape the bellows as this may tear the gasket and
eliminate its ability to seal. A soft bristle brush and solution
of soap and water should be all that is required to keep the
gaskets clean. Do not use full strength de-greasing agents
on the gasket as they could cause the gasket to crack and
become brittle.
To help prevent the blower coil from becoming corroded,
store all acidic items in sealed containers, and immediately
wipe up all spills.
MAINTENANCE
S
T P
E S
S
T P
E S
