INSTALLATION GUIDE · USER MANUAL
GAS HEATER SERIES
16
PRESSURE RELIEF VALVE WARNING
SAFETY NOTICE:
G&D’s heater units, including Fire and Ice
packaged chiller/heaters, may include a pressure
relief valve (PRV) installed on the piping. Under
normal opera�ng circumstances this safety device
will remain closed; however,
in the event of a
system/controls failure, the PRV could open and
vent
a high-pressure stream of boiling hot glycol.
Fig. 1
shows the Cash Acme brand PRV, model
FWL-
2, installed on a G&D heater unit.
While this situa�on is unlikely, there is a small risk
that the heat
er
piping
could become “valved off,”
with the pipe filled with glycol/water mixture that
has nowhere to flow. In this condi�on, if the
burner
is accidentally ac�vated, pressure in the
pipe could reach dangerously high levels. To
prevent a possible pipe rupture/explosion, the
aforemen�oned PRV is installed near the Rinnai
heater unit.
The exis�ng outlet loca�on may be adequate as
-
is; however,
it is the responsibility of the end-
user to
confirm
the outlet of the PRV is in a safe
loca�on, so that it cannot
spray hot glycol/water
mixture onto nearby personnel.
Extending the PRV outlet to a nearby floor drain is
strongly recommended.
If the
PRV outlet needs
to be extended beyond
the
factory
-
installed loca�on, contract a licensed
plumber to perform the work. E
nsure
the plumber
understands the
purpose of the PRV, and that
they
avoid crea�ng any obstruc�ons in the drain
li
ne that could prevent the safety device from
opera�ng properly.
For addi�onal informa�on, refer to the
specifica�on sheet for the Cash Acme FWL
-2
pressure relie
f
valve. A copy available online at the
following address:
htps://www.cashacme.com/sites/default/files/files/FWL2_
WARNING: HIGH TEMPERATURE FLUIDS ARE
DANGEROUS! SEVERE
INJURY OR DEATH COULD OCCUR.
DO NOT ALLOW THE PRESSURE RELIEF DEVICE TO VENT FLUID DIRECTLY
ONTO PERSONNEL. DO NOT OPERATE THE HEATER UNIT UNLESS THE
PRESSURE RELIEF DEVICE IS INSTALLED AND DRAINS PROPERLY
Figure 1.
Cash Acme FWL
-
2 p
ressure relief
valve
installed on copper pipe near electric hea�ng
element