TwinTemp
2/
Jr.
Diagnostics
&
Trouble
Shooting
A.
Use
Rhogard
Boiler
antifreeze
with
Protek
922
additive
or
equivalent
with
Aluminum
tank.
Camco
is
acceptable
with
stainless
steel
tank.
1.
Mix
antifreeze
50/50
with
distilled
water
2.
Total
amount
of
antifreeze
held
in
hydronic
system
of
a
Newmar
coach
is
approximately
5.5
gal.
3.
Always
check
fluid
level
and
condition.
4.
Common
cause
of
contamination;
a.
Repeated
introduction
of
air
in
closed
system
causing
fluid
contamination.
b.
Plumbing
leaks,
radiator
cap,
etc.
c.
Do
not
mix
winterizing
afrz.
or
ethylene
glycol
afrz.
with
propylene
glycol
boiler
antifreeze.
d.
Effects
of
contamination,
sludge,
metal
corrosion.
B.
Starting
diagnostics
check
basics;
power,
fault
codes,
etc.
then
use
the
sequence
of
operation
to
aid
diagnostics.
1.
Two
calls
for
ignition,
Antifreeze
temperature
(tank
thermostat
switch)
and
interior
thermostat.
C.
Causes
and
symptoms
of
restricted
flow.
1.
Sludge/restriction
in
plumbing
loop.
2.
Kinked
plumbing
lines
or
connections.
3.
Sounds
associated
with
restricted
flow
are
rattling
knocking
noise
during
propane
ignition
with
ignition
only
lasting
10
‐
20
seconds.
