Rheem RGFG Installation Instructions Manual page 64

2. MIN HEAT ADJ - This selection per-
mits the adjustment of the low heat
airflow. Operation of this selection
is exactly as with the dipswitches at
SW3 at the furnace control. The
low heat rise can be changed by
increasing or decreasing the airflow
slightly. Adjustments are -15%, -
7.5%, 0, +7.5% and +15%. Note
that when a low heat adjustment is
made, the low heat rate is adjusted
and all points between low and high
heat will be adjusted proportionally
with the greatest adjustment on the
low end and the least adjustment on
the high end. IMPORTANT: Note
that increasing the airflow will
decrease the temperature rise and
decreasing the airflow will increase
the temperature rise. This may not
be obvious at first.
The default factory setting for the
min heat adjustment is "0".
3. MAX HEAT ADJ - This selection
permits the adjustment of the high
heat airflow. Operation of this
selection is exactly as with the dip-
switches at SW3 at the furnace con-
trol. The high heat rise can be
changed by increasing or decreas-
ing the airflow slightly. Adjustments
are -15%, -7.5%, 0, +7.5% and
+15%. Note that when a high heat
adjustment is made, the high heat
rate is adjusted and all points
between high and low heat will be
adjusted proportionally with the
greatest adjustment on the high end
and the least adjustment on the low
end. IMPORTANT: Note that
increasing the airflow will decrease
the temperature rise and decreasing
the airflow will increase the temper-
ature rise. This may not be obvious
at first.
The default factory setting for the
max heat adjustment is "0".
4. FIXED FIRE RATE – This feature
will temporarily fix the gas heating
fire rate to the selection desired.
The selected rate will be applied to
the present heat call only. If there is
no heat call already present when
the selection is attempted, the sys-
tem will not permit the firing rate to
be fixed at the user menu. The firing
rate and blower will be fixed at the
selected rate for the duration of the
existinig heat call or a maximum of
two hours (whichever comes first).
This feature should only be used for
installation, diagnostic, adjustment
and troubleshooting purposes by an
experienced licensed technician.
Selectable firing rates are 40%,
50%, 60%, 70%, 75%, 80%, 85%,
90% and 100%.
64
5. RESET ALL DFLTS – This selec-
tion restores all items in the
"SETUP" menu to the factory
default selections. If "yES" is
selected, all settings in this menu
will be lost.
NOTE: When faults are cleared in
the furnace "SETUP" user menu,
the continuous fan CFM will also be
restored to the factory default set-
ting. (See Continuous Fan
Operation in Communicating
Mode.)
BELOW USER MENU IS USED FOR
NON-COMMUNICATING SYSTEMS
ONLY
"DIPSWITCH" menu – This menu per-
mits viewing of the dipswitch selec-
tions. It is a way to read the dipswitch
selections without the need of translat-
ing the settings manually.
Note: The "DIPSWITCH" menus will
not be displayed at the thermostat.
They are invisible to the thermostat and
can not be displayed. These menus
can only be viewed with the field ser-
vice tool. The reason is that dipswitch
selections do not generally affect oper-
ation of the furnace when using the
communicating mode of operation.
NOTE: The integrated furnace control
does not recognize switch setting
changes while energized. To change
settings, remove power to the board by
turning off the disconnect or switch to
the furnace control or removing power
at the breaker, make changes, then
return power.
1. COOL AIRFLOW – Displays the
value of the cooling airflow select-
ed. See the section of this manual
titled "DIPSWITCH" under "SW1"
(SW1-1 and SW1-2) for details and
selections.
2. HEAT RISE* – Displays the value
selected for the heat rise (either
nominal or nominal plus ten
degrees F). See the section of
this manual titled "DIPSWITCH"
under "SW1" (SW1-3) for details
and selections.
*ALL TEMPERATURES CAN BE
DISPLAYED ONLY IN FAHREN-
HEIT VALUES
3. HI HEAT ADJ – Displays the value
selected at SW3, positions 4 thru 6.
It is the adjustment of the high heat
rate airflow. See the section of this
manual titled "DIPSWITCH" under
"SW3" (SW3-4 thru SW3-6) for
details and selections.
4. LO HEAT ADJ – Displays the
value selected at SW3, positions
1 thru 3. It is the adjustment of
the low heat rate airflow. See
the section of this manual titled
"DIPSWITCH" under "SW3"
(SW3-1 thru SW3-3) for details
and selections.
5. FAN SPD SELECT – Displays
the fan speed selected. See the
section of this manual titled
"DIPSWITCH" under "SW1"
(SW3-4) for details and selec-
tions.
6. AC-HP ADJ – Adjusts the cool-
ing or heat-pump airflow slightly
to change or adjust the tempera-
ture rise slightly. See the sec-
tion of this manual titled "DIP-
SWITCH" under "SW1" (SW1-5
and SW1-6) for details and
selections.
7. ON DEMAND DEHUM –
Toggles the dehumidification
feature on or off. See the sec-
tion of this manual titled "DIP-
SWITCH" under "SW2" (SW2-1)
for details and selections.
8. TST MODE OR STG – Displays
the operation configuration
based on the dipswitch selec-
tions. These selections are
explained in detail in the section
of this manual titled "DIP-
SWITCH" under "SW2" (SW2-2
and SW2-3). Further description
follows:
1 STAGING – (SW2-2 = OFF
and SW2-3 = OFF) Represents
either fully modulating operation
(when valid signal is present) or
staging operation when a single
stage thermostat is connected.
2 STAGING – (SW2-2 = ON and
SW2-3 = ON) Represents timed
staging operation with a two-
stage thermostat.
40 PRCNT TEST – (SW2-2 =
ON and SW2-3 = OFF)
Represents the mode of opera-
tion which will provide 40% heat
rate for any heat call – regard-
less of the rate transmitted by
the thermostat. This mode ends
automatically after the first 60
minutes of operation after
power-up.