2
F100d
JAN 2011
MATERIAL SPECIFICATIONS
Defrost Steps:
PUMPOUT
0 to 15 minutes
HOT GAS
0 to 45 minutes
EQUALIZE
0 to 5 minutes
FAN DELAY 0 to 5 minutes
(For
Plus
models, see page 6.)
Relays: SPDT, 10 amp rating each
Defrost Interval:
24 hour clock, 96 settings (15 min. increments)
7-day clock, 84 settings (2 hour increments)
Remote Initiate models, user selectable
Battery Back-Up: 90 hours for quartz time clock
Power: 115V 50/60Hz; 230V 50/60Hz
Terminal Strip: Accepts 14-22 AWG wire sizes
Controller Temperature Range: -20ºF to 120ºF (-29°C
to 50°C) ambient
Enclosure: NEMA 4, high impact polycarbonate clear
cover, gasketed
Auxiliary ¼” spade terminals for optional defrost
initiate or temperature terminate
ADVANTAGES
The control settings are in refrigeration terms, “defrost
steps”, which make setting and adjusting the Frost
Master® controller simple and easy to understand.
The defrost starts with the removal of liquid refrigerant
from the evaporator before starting the frost melt
period. PUMPOUT (step 1) reduces the load caused
by the cold residual liquid refrigerant and exposes
more internal surface area to the hot gas. HOT GAS
(step 2) introduces the hot gas (or other frost melting
medium) to the evaporator for a set period of time or
can be temperature terminated. EQUALIZE (step 3)
reduces the relatively high pressure inside the newly
defrosted evaporator, thus eliminating the sudden,
sometimes radical surge in suction pressure when
the suction solenoid valve is reopened. FAN DELAY
(step 4) freezes the water droplets from the melted
frost to the evaporator surface instead of permitting
them to blow into the refrigerated space. NORMAL
refrigeration resumes by starting the fan motor.
Usage of all steps is at the designer’s option and any
step may be skipped by setting the defrost step time
adjustment to zero.
When used in conjunction with a Demand Initiate
Defrost device, this controller can limit the number
of defrosts per day or week by not defrosting unless
necessary; the time clock can be used to prevent
defrost from happening when it would not be
advantageous. Temperature terminate contacts are
provided to optionally connect a thermostat or other
device for minimized defrost time.
The Remote Initiate models (clockless) require only
an external, momentary dry contact closure of the
initiate terminals from a computer, PLC, push button,
etc. to start a defrost cycle. This facilitates great
flexibility in various and unusual applications. Frost
Master
®
Plus
models are available having an additional
defrost step, SOFT GAS, to minimize pressure shock
when hot gas is introduced to evaporator. Also, these
models have a built-in temperature terminate feature;
see page 6.
INSTALLATION
Mount controller, which has a watertight enclosure,
in an indoor location away from potential impact
or vibration. To fasten, use four screws (0.5” or
longer); see installation dimensions below. Do not
exceed controller ambient temperature range. Allow
space below enclosure for electrical connections. A
½” conduit knockout (0.88” hole) is provided. Any
additional holes must be located at the bottom of the
enclosure to avoid dust and water damage. Conduit
fittings should be of a watertight seal design where
applicable. Install 5 amp fuse to protect controller
from electrical shorts; see pages 5 and 7.
The Frost Master® is available, less enclosure, with
metal mounting plate, for installation in electrical panel
or approved outdoor enclosure; see below.
INSTALLATION DIMENSIONS
WITH ENCLOSURE
LESS ENCLOSURE WITH METAL MOUNTING PLATE
0.19'' (5 mm) MOUNTING
BOTTOM VIEW
FRONT VIEW
(175 mm)
(157 mm)
(100 mm)
1/2'' CONDUIT KNOCK-OUT
ENCLOSURE BASE
COVER SCREWS (TYPICAL)
CLEAR COVER
3.94''
6.18''
6.89''
(175 mm)
(157 mm)
(29 mm)
1.13
HOLES LOCATED
BEHIND COVER SCREWS
6.89''
6.18''
(88 mm)
FMP
MODELS
ONLY
MODELS
ONLY
FMP
(128 mm)
5.05''
3.45''
2.95''
(75 mm)
(75 mm)
2.95''
0.34''
0.34''
(9 mm)
(9 mm)
SIDE VIEW
FRONT VIEW
0.19'' (5 mm) MOUNTING HOLES
4 PLACES
3.00'' (TYPICAL)
6.88''
7.25''
(175 mm)
(184 mm)
(41 mm)
(159 mm)
(76 mm)
(14 mm)
(86 mm)
6.25''
METAL MOUNTING PLATE
1.63'' (TYPICAL)
(1 mm)
0.19''
(5 mm)
0.03''
0.56''
3.38''
