Rheem RGFG Installation Instructions Manual page 50

The memory card is the default mem-
ory location to be used first when
there is any conflict. If the memory
card has been replaced with a card that
has data for another furnace, the fur-
nace will assume the identity of the
"other" furnace. In all cases, the memo-
ry card has the final say about the data
to use. It is only when the memory card
is not present, is corrupt or specifies a
motor larger or smaller than what is
found in the furnace that the furnace
control will use the data stored in the
microprocessor (a mirror of the most
recent memory card with blower size
matching that found in the furnace).
The hierarchy of data to be used in the
event of a lost card or conflict is listed in
order of importance below.
1. If no memory card present, –
a. Furnace shared data from the
"network" is used. Furnace net-
work shared data is defined as a
redundant copy (or copies) of the
critical furnace shared data stored
at various places and components
on the communicating network.
The "network" can be defined as
follows:
I. The "network" can be the fur-
nace control itself if it was pro-
grammed at the factory and the
memory card has been
removed for some reason.
II. The "network" can be a furnace
control which has had a valid
card previously (either attached
or inserted) and removed for
some reason.
III. The "network" can be a furnace
control attached to a communi-
cating condenser and/or ther-
mostat which has copies of the
furnace shared data that can
be retrieved by the furnace
control.
IV. A furnace control sent as a
replacement part will have no
furnace shared data either in
the microprocessor or on the
memory card. The replacement
control does not include a valid
memory card. The furnace
shared data can be added by:
1. Inserting a valid memory
card (e.g. the original memo-
ry card sent with the original
furnace control or a valid
replacement memory card
ordered from ProStock.
or
50
2. by attaching the furnace
control to a communicating
network (e.g. a condenser
and thermostat) which was
previously connected to (and
operating with) a valid fur-
nace control with valid fur-
nace shared data.
Regardless, the memory
card of a replacement con-
trol cannot be programmed
or reprogrammed in the field
with furnace shared data
and will always remain
blank. In fact, this card does
not even contain the elec-
tronic components neces-
sary to turn it into a valid
memory card.
V. Replacement memory cards
with the appropriate furnace
shared data for any given
model can be ordered from
Pro-Stock. In the event that
the original memory card is
lost, the original furnace con-
trol has been replaced and
there is no furnace shared
data on the network (or the fur-
nace is not part of a communi-
cating network (i.e.: is not con-
nected to a communicating
condenser and thermostat)),
the replacement memory card
must be ordered and installed
into the connector at J15 to
give the furnace valid furnace
shared data. The furnace will
not operate properly without
the correct furnace shared
data. When no furnace shared
data is present (either at the
memory card or on the net-
work) a "d1" (NO SHARED
DATA) fault code will be dis-
played at both the thermostat
active fault screen and at the
furnace control (I.F.C.) seven-
segment displays. Also, the
homeowner will be alerted via
the communicating thermostat
with either a CHECK SYSTEM
or CHECK FURNACE error
message displayed on the
main screen.
If the original memory card is
lost, it should be replaced
even if there is valid furnace
shared data on the network.
The valid furnace shared data
on the network should only be
considered as a backup to the
memory card.
b. If valid furnace shared data is
available from the network and
no memory card is present, a
"d4" (MEM CARD INVALID)
fault is displayed at the com-
municating thermostat active
fault screen and at the furnace
seven-segment displays when
in standby mode only (see
fault code priority list). The
homeowner is not alerted
(level 1 fault).
c. If no furnace shared data is
present on the network and a
memory card is either not pre-
sent or the shared data on the
memory card is not valid, a
"d1" (NO SHARED DATA) fault
is displayed at both the com-
municating thermostat active
fault screen and at the furnace
seven-segment displays pro-
vided a higher priority fault
code is not also present (in
which case the higher priority
fault is displayed) (see fault
code priority list). The home-
owner is alerted via the com-
municating thermostat (level 2
fault).
d. If furnace shared data from the
memory card is not valid or is
not present and shared data
from network can be used, the
appropriate fault (d4, d5, d6,
d7 or d8 – see fault codes in
this manual) is displayed at the
communicating thermostat
active fault screen and at the
furnace seven-segment dis-
plays during standby mode
only. The homeowner is not
alerted (level 1 fault).
2. If memory card present
(attached to IFC or inserted in
J15 of the IFC), furnace shared
data from the memory card (if
valid) will be used to write (or re-
write) the network furnace shared
data and furnace shared data
from card will be used. If the data
on that card is not valid,:
a. If furnace shared data on the
memory card
I. is corrupt or invalid ("d4" –
MEM CARD INVALID"),
and/or
II. is for another component or
different furnace series
("d5" – CARD-HARD
CNFLCT),