11
2.6 Electrical Connections
Standard and Automatic Purge Saving
2.6.1 Power Connections
NOTE: Check Serial Number Tag for correct voltage.
Connect wires to terminal strip. Connect L1 (line) to position 5, L2 (neu-
tral) to position 6, and ground to position 7. Do not make connections to
terminals labeled with grounding symbol or labeled with RS.
Set the voltage selection switch located at the lower edge of the control
board for the proper supply voltage.
Electrical entry is 7/8” dia. hole for 1/2” nominal conduit entry.
2.6.2 Alarm Connections -
Dry contacts for a remote alarm are supplied at terminals 20, 21, 22.
When the unit is energized and no alarms are in effect, continuity should
exist between terminals 20 and 21, with no continuity between terminals
21 and 22. Alarm contact is common for switching failure alarm and
optional high humidity alarm.
Maximum contact rating is:
240 VAC - 5.0 amps
50 VDC - 1.0 amps
NOTE: Check Serial Number Tag for electrical values.
2.7 Provisions for Purge Exhaust
Purge exhaust must be routed through the factory supplied mufflers or
piped to a remote location.
2.7.1 Purge mufflers - If shipped separately, install purge exhaust muf-
flers in the locations shown in Figure 2C, 2D, or 2E.
2.7.2 If purge exhaust is piped to a remote location, choose a pipe size
large enough so that back pressure through the piping is not
created.
WARNING
Do not operate dryer without one of the above measures.
Exhausting air will result in noise levels above OSHA
permissible levels and exhausting gas could potentially
cause harm to persons or property.
2.8 Initial Desiccant Charge
The dryer is shipped complete with desiccant and ready to operate after
piping and electrical connections are made.
FIGURE 2E Electrical Schematic (Standard Dryers)
CUSTOMER
POWER
CONNECTIONS
(SEE NOTE 1)
GROUND
NEUTRAL
LINE 1
2TB-7
2TB-6
2TB-5
1TB-4
1SS
1TB-3
1TB-2
1FU
125mA
250V
1TB-1
12
T
LOW VOLTAGE
SUPPLY TO SOLID
STATE TIMER AND
CONTROL CIRCUITS
3TB-8
3TB-9
3TB-10
4TB-12
4TB-13
3TB-11
4TB-14
4TB-15
5TB-16
5TB-17
5TB-18
5TB-19
7TB-23
7TB-24
7TB-25
6TB-20
6TB-21
6TB-22
8TB-26
8TB-27
8TB-28
8TB-29
1PS
2PS
CR
CR
CR
POWER OFF/ON SWITCH
SPARE LOAD CONNECTIONS
SOLID STATE
TIMER AND
CONTROL CIRCUIT
STEP DOWN
TRANSFORMER
120/240 VAC
CONTROL BOARD
INLET VOLTAGE
SELECTOR SWITCH
(SEE NOTE 1)
SOLENOID CIRCUIT FUSE
RIGHT TOWER
INLET SWITCHING
SOLENOID
LEFT TOWER
PURGE/
REPRESSURIZATION
SOLENOID
RIGHT TOWER
PURGE/
REPRESSURIZATION
SOLENOID
LEFT TOWER
INLET SWITCHING
SOLENOID
SPARE GROUND
CONNECTIONS
1SST
1SST
1SOL
2SOL
3SOL
4SOL
1Q
2Q
3Q
4Q
GATE
2FU
1.6A
250V
TO SOLID
STATE
TIMER
AND
CONTROL
CIRCUITS
TO SOLID
STATE
TIMER
AND
CONTROL
CIRCUITS
RIGHT TOWER
SWITCHING FAILURE ALARM
PRESSURE SWITCH
LEFT TOWER
SWITCHING FAILURE ALARM
PRESSURE SWITCH
COMMON ALARM
CONTACTS
(SEE NOTE 2)
2SS
10
9
7
1
3
4
6
(120)
(240)
CUSTOMER
COMMON
ALARM
CONNECTIONS
(SEE NOTE 2)
COMMON ALARM
RELAY
(SEE NOTE 2)
GATE
GATE
GATE
(SEE NOTE 1)
(SEE NOTE 1)
(SEE NOTE 1)
(SEE NOTE 1)
CONTROL CIRCUIT FUSE
