Dwyer AP - Manual (Page 3)

Type AP and AP-41 with Suffix No's.
-153, -2, -3, -26, 36, -88, -89
OPERATION
A variation in control pressure causes the diaphragm to actuate the hermetically
sealed mercury switch to open or close the electrical contact.
APPLICATION
Type AP with suffix numbers -153, -2, -3, -26, -36, -88, -89 are for use with
mediums not injurious to steel, silver solder or Fairprene diaphragm.
Type AP-41 with suffix numbers -153, -2, -3, -26, -36, -88, -89 are for use with
mediums not injurious to 316 SS and PTFE.
MOUNTING
Install control firmly in a LEVEL POSITION on a panel or smooth wall surface by
means of two mounting ears. Where pipe mounting is desired, control may be
connected by means of the 1/4˝ I.P.S. connection. Do not mount control by
twisting the case; use a wrench on the square part of the 4˝ bottom pipe
connection. To level, sight across the two cover screws or check the lower end of
the glass opening in the cover to see that instrument is lined up horizontally.
WIRING
Wire in accordance with local electrical codes or equipment manufacturers’
instructions. See nameplate attached to inside of control case for terminal markings
and electrical rating. Do not overload. Do not oil any parts. Do not tamper with
switch wires. Position of these wires is essential for proper operation. Tampering
with these wires will void warranty.
Type AP and AP-41with Suffix No’s.
153, -2, -3, -26, 36, -88, -89
OPERATION
A variation in control pressure causes the diaphragm to actuate the snap action
switch.
APPLICATIONS
Type AP, APH, APW, APWT with suffix numbers 7021-153 or 8021-153 are for use
with mediums not injurious to steel, silver solder, Nylon/Buna-N diaphragm.
Type AP, APH, APW, APWT with suffix numbers 7041-153 or 8041-153 are for use
with mediums not injurious to 316 SS and PTFE covered diaphragm.
MOUNTING
Mount in any position.
Type AP (general purpose) can be installed on a panel or smooth surface using the
two mounting ears or the 4˝ NPT bottom connection. Do not mount by twisting
the case; use a wrench on the square part of the 4˝ bottom pipe connection.
Type APW-NEMA 3 (weather-resistant): 4˝ male NPT bottom connection.
Type APWT-NEMA 4 (water-tight): 4˝ male NPT bottom connection.
Type APH (explosion-proof ): 4˝ male NPT bottom connection. Or use mounting
bracket No. PP-135-95
WIRING
Wire in accordance with the national Electrical code and local regulations. Observe
wiring diagram inside enclosure and details below for type No. and electrical rating.
Where control is connected directly into the load circuit, it must be wired into hot
side of line. Do not overload. Do not oil any parts.
All Types Single-Pole, Double-Throw (-153) or
Double-Pole, Double Throw (-804) Operation
On Hi On Hi
Common On Lo Common On Lo
-804 - DP-DT
Common
On Hi On Lo
-153 - SP-DT