Gardner Denver ELECTRA-SAVER II Service Manual page 33

RD. V.
BOOT
C. R
D.S.A
D. S. C.
FUSE
H. D.T.S.
H. M.
l.c. 1.0.
1. C .T.O.
i.o. l.c.
1.0. T. C.
LO.P.S
M
— 1" —
2-Way Normally Open — 2W. N.O. Air
Operated Valve – 90AR1 14.
B.D.V.'s are sized to blow down oil reservoir
in approximately 45 seconds If the com
pressor is started or loads up (low unloaded
HP only) before the reservoir is blown down
the compressor may be starting under load
which may cause motor failure and/or oil
mist will be carried over into the lines
— 24 CA281 — Transparent for PB's when
NEMA 4.
– Control Relay –
24 CA771 – 110/120 V–
50/60 Hz Coil – 2S.P.N.O. Convertible 600
Volt Contacts
— Disconnect Switch Interlock — Aftercooler.
— Disconnect Switch Interlock — Compressor.
— 2-1/4 AMP — 250 Volt — Time Delay Type.
Tan Terminal Board – 24 CA158 (Buss FRN
2-1 /2 or Equal). Blue Terminal Board —
24 CA1026 (Buss MDL 2-1/2 or Equal).
— High Discharge Temperature Switch — Set
230° F.
Single Probe Controller – 24 CA779. Ther-
mistor Probe 24 CA780.
Dual Probe Controller — 21 D80. Thermistor
Probe — 21 D81 (2 Required).
— Terminals on Temperature Switch.
— Hourmeter — 2009369 — 120 V — 60 Hz
(Alternate 2009370 – 110 V – 50 Hz).
— Instant Closing — Instant Opening.
— Instant Closing — Timed Opening.
— Instant Opening — Instant Closing.
— Instant Opening — Timed Closing.
– Low Oil Pressure Switch – 88A31 O Set 10-
15 Psi.
NOTE
When starting unit for first time at final in
stallation loosen tube fitting on bottom of pres-
sure switch After compressor is started and
oil appears at the fitting tighten fitting If
compressor shuts down on low oil pressure on
the first start until all the air has been
bled off thru the blowdown valve before pressing
reset button and restarting the compressor.
—
Motor Starter Coil Contacts etc The oil
cooler starter furnished as standard equip
ment has 1 10/1 20 V— 50/60 Hz coils (See
Note "D" for Compressor Starter.)
M. U.-B. D.V. — Magnetic Unloader — Blowdown Solenoid
Valve— 1 10/120 V— 50/60 Hz— Four Way
– 91 B34.
The LOW DEMAND MODE switch should be
in the "OFF' position when starting the unit
to keep the compressor from cycling rapidly
if service valve is closed
M. W. V.
– Magnetic Water Valve– 11 0/120 V– 50/60
Hz – Two Way Normally Closed – 2W. N.C.
WATER-COOLED OIL COOLER
NEMA 1 NEMA 4
91 B3 – 1-1/2" 91 B24 – 1-1/2"
M. W.V.'S are also shown on the Wiring Dia-
grams for Water-Cooled Aftercoolers (when
used) and are to be sized for the aftercooler
(if used).
O. L
RP. S.
RR
T. C. 1.0.
T. D.
T. 0.1. C.
V. R.
\/
-o-
/ \
— Overload — Heater Contacts
— Reservoir Pressure Switch (not standard on
early models) – 88 H99. Set 5 PSI falling
pressure Prevents compressor starting after
a power shutdown and/or power interruption
until reservoir is below 5 PSI.
– Reset Relay – 24 CA541 – 1 10/120 V —
50/60 Hz Coil – 2S. P. N.O. Convertible 300
Volt Contacts Used with all automatic start
controls which have low oil pressure shut-
down This relay gives LOW VOLTAGE pro
TECTION which means a manual reset is
required after every power turnoff or inter-
ruption See the appropriate control wiring
diagram for additional control switch com
ponents and resetting instructions
— Timed Closing — Instant Opening.
– Time Delay Relay– 24 CA285 – 1 10/120 V
— 50/60 Hz Coil — is set for a maximum of
10 seconds to establish oil pressure after
each start-up If the TD timing coil fails the
compressor will not load when started and
will unload if running when control is cow
stant speed If the TD timing relay fails on
an autostart timed-stop control the com-
pressor will not start if running unit will un-
load and continue running unloaded for the
time setting of TR
— Timed Opening — Instant Closing.
— Voltage Relay
200 Volts – 60 Hz – 24 CA772
230 Volts – 60 hz – 24 CA773
380/460 Volts – 50/60 hz – 24 CA774
575 Volts – 60 hz — 24 CA775
– Jumpers On Terminal Blocks (T. B)
— Indicating Light — 24CA40 (Sylvania 120
PSB or Equal).
13-9-630 Section 4
Page 17