Bulletin 30-21 – Page 11
SPECIFICATIONS
MKC-2 Coil
SERVICE
The Type 180 Solenoid Pilot Control can not be taken apart in
the field. To properly analyze suspected trouble on an instal-
lation, it is advisable to install a pressure gauge by means of a
“T” fitting in the external equalizer connection to the thermo-
static expansion valve, as shown in Figure 12.
By successively opening and closing the circuit to the Pilot
Control only, with the refrigeration system and circulating
fans or pumps in operation, variations approximating con-
densing pressure and suction pressure should be observed on
this gauge.
A. If pressure does not build up rapidly to condensing pressure
when the Pilot Control is de-energized, proceed as follows:
1. Make certain that the electrical circuit has been broken
to the Pilot Control. Since the actuating device is gen-
erally at a remote point, we suggest that a means for
temporarily interrupting the current be made near the
valve installation to facilitate servicing the equipment.
2. Check to see that no restriction exists and pressure
is ahead of both the Solenoid Pilot Control and the
C-032-F Catch-All Filter-Drier.
3. Check to ascertain that the low pressure port is closing
tightly. A leak in many instances can be detected by a
much cooler line from the Pilot Control to the suction
line than the liquid inlet line of the control. A further
check can be made by removing the suction line con-
nection at the Pilot Control and temporarily plugging it.
No leak should be indicated at the suction fitting of the
Pilot Control.
On double-ported thermostatic expansion valves, such as
Sporlan’s Types V and W, the chance of dirt causing leakage
is increased since either port could be partially blocked open.
If this occurs, the leakage would be even greater since both
ports would leak because the seating discs operate on the
same shaft. Therefore, an adequately sized Catch-All should
be installed ahead of the thermostatic expansion valve for
complete protection.
The Type 180 Solenoid Pilot Control is not recommended
for application with other makes of thermostatic expansion
valves. The reason is that Sporlan diaphragm assemblies are
specially designed to withstand the admission of high side
pressure through the external equalizer connection.
The Type 180 may be installed either upright or on its side.
However, it should not be mounted with the coil housing
below the valve body.
INSTALLATION
In addition to first cost, flexibility of the Type 180 offers an
installation savings. Standard 1/4” soft copper tubing is the
only tubing required for the three valve connections as shown
in Figure 12. A C-032-F Catch-All Filter-Drier is furnished with
each Type 180, since protection of the valve ports from system
contaminants is important for proper operation.
Electrical
For normal summer operation of air conditioning systems,
the Type 180 Solenoid Pilot Control may be energized through
any actuating device such as a thermostat, a micro-switch, or
a manual switch. The compressor can be operated separately
through the magnetic starter, wired with a low pressure cut-
out switch for pump down control.
If it is necessary to shut down a system for a long period, the
main liquid line or receiver valve should be closed before
de-energizing the entire system at the main electrical ser-
vice switch. This will protect against compressor floodback
if any of the unusual pressure conditions mentioned in the
Application section occur during shutdown.
DIMENSIONS - Inches (mm)
Suction
3.17”
81 mm
High
Pressure Inlet
Common
2.00”
51 mm
2.66”/ 68 mm
0.44”
11 mm
4.50”/ 114 mm
1.75”/ 44 mm
Coil Removal
Figure 12
Type 180 Standard Coil Ratings
Connections - 1/4 SAE Flare Volts/Cycles Watts
MOPD
psi
300 AC (21 bar)
24/50-60
120/50-60
208-240/50-60
120-208-240/50-60
15225 DC (15.5 bar)
Maximum Rated Pressure - psi 500 (35 bar)
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