Brochure

Page 28 / Bulletin 30-10
Application Sporlan Solenoid Valves
n
All current values are based on 60 cycles.
n
Volt-ampere ratings are based on inrush currents.
n
Above values are based on the most severe conditions. — Consult Sporlan for coil characteristics on specific valve types.
There are several piping arrangements used for hot
gas defrost systems, one of which is shown in Figure
9. A portion of the compressor discharge gas is passed
through the solenoid valve into the evaporator. The
solenoid valve may be controlled either manually or
automatically for this duty.
Gas defrost valve selection requires a slightly different
approach from the simple pressure drop versus ton-
nage. Be sure to consider the evaporator temperature
correction factors shown at the bottom of the dis-
charge gas capacities table in order to make certain
that the valve selected does have adequate capacity.
Compressor Capacity Reduction Service
Sporlan Solenoid Valves may be used in conjunction
with Sporlan Discharge Bypass Valves for capacity re-
duction service. For capacity information and further
details on the Discharge Bypass Valves see Bulletin
90-40 or consult Sporlan, Washington, MO.
Water Service
See Pages 19 & 20 — Industrial Valves.
Filter-Driers are Essential
Dirt and other system contaminants present a problem
for refrigeration and air conditioning controls. Since
pilot operated solenoid valves operate with rather
close tolerances, system cleanliness is imperative.
The Sporlan Catch-All
®
Filter-Drier filters out
minute particles of dirt and other foreign matter, thus
protecting the valve.
Filtering is important on ammonia systems also. The
replaceable core Catch-All
®
Filter-Driers, designed
for ammonia use, acts as a scale trap to protect sys-
tem components. Therefore, we recommend using a
Sporlan Catch-All
®
Filter-Drier ahead of every so-
lenoid valve on all refrigeration and air conditioning
applications. Contact Sporlan before adding a Catch-
All
®
Filter-Drier in the discharge line.
Transformer Selection for Low-Voltage
Control Systems
Many systems utilize low voltage controls, requir-
ing the use of a transformer for voltage reduction,
normally to 24 volts. The selection of a transformer
is not accomplished by merely selecting one that has
the proper voltage requirements. The volt-ampere
(VA) rating is equally important. To determine the
VA requirement for a specific solenoid valve, refer to
the chart below. It should be noted, that insufficient
transformer capacity will result in reduced operating
power or lowering of the MOPD value.
If more than one solenoid valve and/or other accesso-
ries are operated from the same transformer, then the
transformer VA rating must be determined by adding
the individual accessories’ VA requirements.
Fusing
Sporlan Solenoid Valves are not supplied with fuses.
Fusing should be according to local codes. We recom-
mend fusing the hot leg of the valve wiring with fast
acting fuses and the valve should be grounded either
through the fluid piping or the electrical conduit.
TIKLIOC
/STLOV42
SELCYC06-05
/STLOV021
SELCYC06-05
/STLOV042
SELCYC06-05
GNITARREMROFSNART
SEREPMA-STLOV
SEREPMA-TNERRUC SEREPMA-TNERRUC SEREPMA-TNERRUC
DETARFO%001ROF
EVLAVFODPOM
HSURNI GNIDLOH HSURNI GNIDLOH HSURNI GNIDLOH
1-CKM
1-CKMO
9.1 36. 93. 41. 91. 90. 06
2-CKM
2-CKMO
1.3 4.1 06. 62. 13. 31. 001
Figure 9
Evaporator
Suction
Pressure
Regulator
Re-Evaporator
Compressor
Receiver
Thermostatic
Expansion Valve
Defrost
Solenoid Valve
Condenser