WARNING
Please read this installation sheet fully and
carefully. The PG20 Pressure Guard is a mains
voltage device. Death or serious injury may
result if this product is not correctly installed
and used.
INTRODUCTION
The PG20 Pressure Guard is a microprocessor controlled
solid-state pressure switch. It is designed for guarding
pipework and equipment against over or under pressure.
The PG20 features two adjustable trip points that can be
independently set to stop a pump if pressure exceeds
settable levels. The low level trip point feature has an
automatic 10-second time delay buffer built in to allow
normal pressure fluctuations to be ignored. System
pressure can drop to below the low level trip point setting
for up to 10 seconds without triggering the switch and
shutting down any equipment in the control circuit. The
PG20 also has a fine tune zeroing adjustment that allows
the switch to be calibrated accurately to any required
pressure within its range. The fine tune adjustment dial
can also be used to offset the entire operating range of
the switch and to select pressure set points that may lie in
between the main dial graduations of the switch.
WARNING
The PG20 Pressure Guard is water resistant
to IP67. This rating only applies if the clear
control lid is in place and its two fixing screws
fully tightened. The PG20 is not water resistant
unless the clear lid is in place and fully secured.
Always replace the clear lid and fully tighten
its two screws after making changes to the
settings. The PG20 may present a shock hazard
and death or serious injury may result if water
enters the PG20’s electrical housing. There are
no user serviceable parts in this device. Under
no circumstances should the main housing be
opened. Warranty on this product is automatically
void if the sealed body screws are opened.
IMPORTANT
This installation and usage information sheet must be
read with reference to the specific switch model being
installed. The supply voltage, power switching capacity
and the pressure rating of the switches may vary from
model to model and it is very important to understand the
limitations of a specific model before installing it.
MODELS
PG20 - 240 - S - 5 - NO
CONTACTS
NO = NORMALLY OPEN
NC = NORMALLY CLOSED
CABLE CORES
4 = 4 CORE 10Amp CABLE
5 = 5 CORE 16Amp CABLE
SUPPLY VOLTAGE
240 = 220 to 240VAC
24 = 24VAC or DC
PRESSURE RANGE
20 = 0 to 20 Bars
CABLE
NO LETTER - 10Amp PLUG & PLAY
HD = HEAVY DUTY 15Amp CABLES 2 X 2M LONG
S = SINGLE CABLE 2M LONG WITH 4 or 5 CORES
OPERATING ENVIRONMENT
Ambient Temperature Range 1ºC to 50ºC
Liquid Temperature Range
1ºC to 60ºC, See note below
Ingress Protection Rating
IP67
Supply PG20-240
(all 240VAC Models)
220 to 250VAC 50Hz
Supply PG20-24-S-5
(24VAC/DC Model)
12 to 28 Volts AC or DC, 100mA
OPERATING RANGE
High Pressure Trip Point
Adjustable from 5 to 19 Bars in
15 steps
Can also be set to zero if high cut
out is not required
Low Pressure Trip Point
Adjustable from 1 to 15 Bars in
15 steps
Can also be set to zero if low cut
out is not required
Fine Tune Adjustment
Range is plus to minus 1 Bar in
16 steps
Start Timer Adjustment
Range
Adjustable from zero to
180 seconds in 16 steps
Maximum Switched Load
PG20-240-S-5
240VAC 50Hz 6Amps
For control circuit applications only
Maximum Switched Load
PG20-24-S-5
240VAC 50Hz 6Amps
For control circuit applications only
Maximum Switched Load
PG20-240-S-4
240VAC 50Hz 10Amps
(for motor loads to 3HP only)
Maximum Switched Load
PG20-240-HD
240VAC 50Hz 15Amps
(for motor loads to 5HP only)
Operating Pressure Range
0 to 20 Bars (0 to 300psi),
See note below
Burst Pressure
45 Bars (650 psi)
WARNING SAFETY NOTE: In the interests of safety
the PG20 Pressure Guard must NOT be used in hot
water applications (>60ºC). The PG20 Pressure Guard
is designed to operate at pressures up to 20 Bars (300
psi) and must not be used in applications where either
the static or dynamic pressure exceeds this rating.
INSTALLING AND USING
THE KELCO PG20 PRESSURE GUARD
