P7810A-D PRESSURETROL® CONTROLLER
65-0268—1
4
Controller next to the pressure gauge in the
manufacturer-provided fitting on the boiler. See Fig. 2 and 4.
Mount at a remote location to avoid excessive vibration, or
mount in a special mounting on a low water cutoff.
IMPORTANT
1. Locate the P7810 Pressuretrol® Controller where
ambient temperature does not exceed 140°F (60°C).
2. Use pipe compound sparingly to avoid clogging the
hole in the pipe or the sensor element fitting.
3. Do not hand tighten the controller connection by
holding the case. Use a wrench on the flats of the
sensor fitting to avoid leaks and damage to the case.
4. Level the controller for appearance.
5. Install the P7810 where the relative humidity never
reaches the saturation point. The P7810 is designed
to operate in a maximum 85 percent relative
humidity, continuous, noncondensing moisture
environment. Condensing moisture can cause a
shutdown.
6. Do not install the P7810 where it could be subjected
to vibration in excess of 0.5G continuous maximum
vibration.
7. The P7810 is not designed to be weather tight. If
installed outdoors, protect the P7810 with an
approved weather-tight enclosure.
CAUTION
Equipment Damage Hazard.
Incorrect installation of the L404 Pressure
Controller can damage the equipment and may
require boiler replacement.
Install the L404C Pressuretrol® as shown in Fig. 2 and
3 to prevent equipment damage.
Fig. 2. Connecting P7810A,B Pressuretrol® Controller to
steam boiler.
Fig. 3. Right and wrong mounting of steam trap (siphon
loop) for the L404 Pressuretrol® Controller, with
approximate dimensions in in. (mm).
Mounting
Make all pipe connections in accordance with applicable local
standards. Use parallel jaw wrench to tighten P7810
Controller hexagonal fitting to avoid leaks and damage to the
case.
Mounting P7810 Controller Next to Pressure Gauge
To mount the P7810 Pressuretrol® Controller next to the
pressure gauge:
1.
Remove the pressure gauge.
2.
Replace the gauge with a siphon loop with tee
connector on top.
Fig. 4. Connecting P7810C,D Pressuretrol® Controller to
steam boiler.
P7810A,B
L404C
LIMIT
L91
GAUGE
MOD.
BOILER
M4879B
SIPHON
LOOP
4-1/2 TO 5-1/2
(114.3 TO 139.7)
BOILER
14026
STEAM TRAP
(SIPHON LOOP)
TEE
PRESSURE
GAUGE
PRESSURE
CONTROLLER
M8934A
1
1
1/4 IN. BLACK IRON PIPE WITH 1/4 - 18 NPT EXTERNAL
TRHEADS ON BOTH ENDS. BEND THE STEAM TRAP
(SIPHON LOOP) TO LEVEL THE CONTROLLER.
CORRECT
BOILER
2-1/4
(57.2)
DIA.
INCORRECT
P7810C,D
GAUGE
BOILER
M11891
