TAC Pneumatic Products Catalog

S52x Series, S53x Series, S54x Series (239X-500 Series)
Typical Applications
2
From Timer
& E/P Relay
(16 psig day,
25 psig night)
16psig
M M
1
2
M
B
5 4 3
1
To Final
Control Devices
25psig
1 Selector Switch
with Day-Auto-
Night Dial
Switch
Position
Figure 1 Automatic or Manual Changeover of Day/Night System.
Figure 2 Internal Port Connections.
Ports Thermostat Supply Pressure
Connected Day Night
1 1 & 5 16 psig –
2 2 & 5 16 psig 2 25 psig 2
3 3 & 5
– 25 psig
2 Supplied from an E/P relay controlled by a programmed timer.
1 2 5 4 3 1 2 5 4 3 1 2 5 4 3 1 2 5 4 3 1 2 5 4 3 1 2 5 4 3 1 2 3 4 5 1 2 5 4 3 1 2 5 4 3
S520
Port 5 blocked
S530
Ports not connected to 5 blocked
S540
Ports not connected to 5 blocked
1 2 5 4 3 1 2 5 4 3 1 2 5 4 3 1 2 5 4 3 1 2 5 4 3 1 2 5 4 3 1 2 5 4 3 1 2 5 4 3 1 2 5 4 3
S521
Port 1 Port 2
blocked blocked
S531
Ports not connected to 5 vented
S541
Ports not connected to 5 vented
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