Rheem (-)GRC Series Installation Instructions Manual page 50

SETTING BLOWER
TIMINGS
The Honeywell UT ELECTRONIC
CONTROLS and Invensys Climate
Controls IFC'S (Integrated Furnace
Controls) have three or four quick
connect terminals for connecting the
motor speed leads. These are:
1. FAN SPEED — motor runs on
this speed when the thermostat
is in the "FAN ON" position.
2. COOL — connect desired
cooling speed.
3. HEAT — connect desired
heating speed.
4. HEAT/COOL (not available on
UT Electronic Controls-1028-925
control board) or Invensys
Climate Controls ICC-H1MC7-01
— connect desired speed when
heating and cooling speed are
the same.
IMPORTANT: Do not connect any
motor speeds to "HEAT" and "COOL"
if you use the "HEAT/COOL" terminal.
5. If heating and continuous fan
speed are the same, "piggyback"
jumper across "FAN" and "HEAT"
terminals.
See Figures 51, 52 & 53 for
instructions for setting the blower
"OFF" timings.
If cooling speed and fan speed are
desired to be the same, this may be
accomplished by not connecting "Y"
to the integrated furnace control.
If desired for cool, fan and heat to all
be the same speed, then "piggyback"
jumper "H/C" to "FAN" and do not
connect "Y" to the integrated furnace
control. Do not connect anything to
"H" or "C."
50
FIGURE 51
UT Electronic Controls 1028-928
BLOWER OFF TIMINGS
ON
NOTE: SWITCH 3 IS USED FOR
TWINNING APPLICATIONS.
I402
OFF TIME SWITCH 1 SWITCH 2
90 SEC. OFF
120 SEC. OFF
160 SEC. ON
180 SEC. ON
FIGURE 52
UT Electronic Controls 1012-925A
& Invensys Climate Controls
ICC-H1MC7
BLOWER OFF TIMINGS
(TIMER IS
RED BLOCK
ON BOARD)
OFF TIME SWITCH 1 SWITCH 2
90 SEC. OFF
120 SEC. OFF
160 SEC. ON
180 SEC. ON
FIGURE 53
UT Electronic Controls 1012-925B
BLOWER OFF TIMINGS
GAS FURNACE (DIRECT
DRIVE) INSTRUCTIONS
FOR CHANGING BLOWER
SPEED
WARNING
DISCONNECT THE ELECTRICAL
SUPPLY TO THE FURNACE
BEFORE ATTEMPTING TO
CHANGE THE BLOWER SPEED.
FAILURE TO DO SO CAN CAUSE
ELECTRICAL SHOCK RESULTING
IN PERSONAL INJURY OR DEATH.
ON
The blower motor is wired for blower
OFF
speeds required for normal operation
OFF
as shown.
ON
If additional blower speed taps are
available (leads connected to "M1"
and "M2" on the electronic control),
speeds may be changed if necessary
to fit requirements of the particular
installation. Reconnect the unused
motor leads to "M1" or "M2." Check
motor lead color for speed
designation.
Heating speeds should not be
reduced where it could cause the
furnace air temperature to rise to
I335 exceed the maximum outlet air
temperature specified for the unit.
IMPORTANT: Always check air
ON
temperature rise after changing the
OFF
heating speed for any reason.
OFF
ON