RVZC30 (and BB/T/TBB/WA), RVZP30 (and BB/T/TBB/WA), RVC24
32
0407
any further adjustments. Replace the valve stem cap after the
valve super-heat has been adjusted. BE CERTAIN THE VALVE
STEM CAP IS WIPED DRY FIRST.
! CAUTION !
DISCONNECT POWER TO THE CASE
BEFORE SERVICING ELECTRICAL COMPONENTS TO
AVOID PERSONAL INJURY AND DAMAGE TO THE UNIT.
Defrost Heater Element
On 30" door cases one heater is located on the front of the coil
and one on the rear of the coil (Figure 25). On 24" door cases
and wraparound cases, the heater element is located under
the coil (Figure 26). The electric wire leads are connected in
the junction box behind the front kick rail.
Heater Element Removal
Front and rear heater location (VZ and VZT 30” door)
The defrost heaters are located on the front and rear face of
the coil. The front heater is located approximately 1" off the
floor and the rear heater is approximately 2" off the floor. The
heater is secured to the coil by a number of stainless steel
heater retaining clips. Heaters are fastened to the floor on the
right hand side of the coil. Remove fasteners holding the heater
to the floor.
The front heater can be removed by pulling the retaining clip
away from the coil and sliding the heater out from under the
clip.
The rear heater can be removed by raising the heater retain-
ing clip. Raise each clip about 2 inches above the coil working
from right to left on the coil. Repeat this process until the
retaining clips are free of the coil. The heater will slide up with
the retaining clip.
Under coil location (VZ 24” and WA and WB door)
To remove the defrost element, remove the coil covers. Lift the
inner coil cover upward and tip the fan housing forward. This
will expose the coil. Remove both fan housing end brackets
and center coil supports, then slide out the complete heater
pan assembly from under the coil. Slowly lift the heater pan
assembly between the coil and fan housing, turning it on edge
while lifting.
Heaters are installed in the reverse order of how they were
removed.
Evaporator Fans
Air is circulated throughout the case with 115-volt low tempera-
ture fan motors. These motors must be operating at all times
except during defrost. Fan motors should be replaced with
motors having the same characteristics including type, physi-
cal size, wattage and RPM.
Air Curtain Velocity
Air curtain velocity is affected by stocking levels, coil frost
loads, temperature and fan condition. The measurement
method also affects the reading. Zero Zone recommends
using an Alnor Velometer Jr., set to the 0-to-800 fpm range.
Air velocity should be measured at the back edge of the
discharge air honeycomb, at the center of the middle door in
the case (other doors have slightly lower velocity). A typical
VZ velocity reading is 425 feet per minute in a fully-packed
freezer, after the freezer has defrosted and pulled down to
operating temperature. A typical VZT velocity reading is 400
feet per minute under the same conditions. Air curtain
velocity in a partially-packed freezer is significantly lower
because more air exits the back wall duct holes.
Fan Removal
1.
Turn off power to fans. Remove coil cover.
2.
Unplug fan from fan power supply plug located on the
front face of the fan housing.
3.
Remove the fan blade nut and fan blade.
4.
Remove the two mounting bolts and remove the fan
assembly from the fan housing.
5.
Remove the three fan motor mounting screws from the
back of the fan motor.
6.
Reverse steps 1 - 5 to install.
Ballasts — 1-Door, WA and WB
Most Zero Zone case ballasts are located in the door mullion.
Ballasts for the 1 door, WA & WB, are located behind the
kickplate.
Fluorescent Lighting
T-8 lighting is standard on all cases. These systems use a lens
to direct light output evenly across the shelves. Turn off power
before servicing the lamps. The lens must be removed to ac-
cess the lamp. The lens must be replaced after servicing for
proper operation. Detailed information is contained in the door
instruction booklet.
Optional Lighting
When optional lighting systems (LED, fiber optic) are supplied,
separate instructions are supplied with the case.
Summary of Contents for RVZC30
Page 1: ......
Page 2: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 2 0407...
Page 5: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 5 0407 Figure 1 Case label information...
Page 9: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 9 0407 Figure 5B All base locations...
Page 10: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 10 0407 Figure 5C All base locations...
Page 24: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 24 0407 Figure 23 Hot gas wiring...
Page 25: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 25 0407 Figure 24 Single point wiring...
Page 26: ...RVZC30 and BB T TBB WA RVZP30 and BB T TBB WA RVC24 26 0407 Figure 25 Master satellite wiring...
