2
P47 Installation Instructions
Note:
If the boiler manufacturer
recommends a specific mounting
location for the pressure control,
follow the manufacturer’s
mounting recommendations.
Wiring
!
WARNING:
Risk of
electrical shock.
Disconnect the power
supply before mounting and
wiring to prevent possible
electrical shock. On multiple
circuit units, more than one
circuit may have to be
disconnected.
!
CAUTION:
Risk of
equipment damage.
Disconnect the power
supply before mounting and
wiring to prevent possible
equipment damage. On
multiple circuit units, more
than one circuit may have to
be disconnected.
All wiring must conform to the
local, national, and regional
regulations. Do not install the
control on electrical loads in
excess of the rating that is listed
on the inside of the control
cover. Use copper conductors
only.
IMPORTANT: Use the terminal
screws furnished in the
switch (8-32 x
1/4 in.). Longer terminal
screws can interfere with
the switch mechanism and
damage the switch.
Refer to Figures 8 and 9 for the
SPDT wiring hookups on EA and
FA types. The red terminal is
common, the red to yellow circuit
closes on pressure increase, and
the red to blue circuit opens on
pressure increase.
See Figures 4-7 for wiring
hookups on other P47 models.
Adjustment
Figure 3 illustrates open-high
models. On open low models,
adjusting screw “A” raises or
lowers the cut-in point (this also
raises or lowers the cutout point
by a like amount). Set the cut-in
point first using adjusting screw
“A.” Cutout adjusting screw
“B”changes the cutout point only.
Checkout Procedure
Before leaving the installation,
observe at least three complete
operating cycles to be sure that
all components are functioning
correctly.
Test the limit switch function to
be sure the system shuts down
when the limit contacts open.
Repairs and Replacement
Field repairs must not be made
except for replacement of the
knob and cover. For a
replacement knob or cover,
contact the nearest Johnson
Controls distributor.
Fig. 3 -- Interior view of P47AA (open-high control)
