Rheem RGPH Installation Instructions Manual page 27

SETTING BLOWER TIMINGS
The Honeywell and UTEC control
boards have 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" position.
2. COOL — connect desired cooling
speed.
3. HEAT — connect desired heating
speed.
4. HEAT/COOL — 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 speed are
the same, jump across "FAN" and
"HEAT" terminals.
See Figures 23, 24 and 25 for instructions
for setting the blower "OFF" timings.
FIGURE 23
UTEC -920 OR WHITE RODGERS
50A62-101 BLOWER OFF
TIMINGS
ON
NOTE: SWITCHES 3 & 4 ARE USED
FOR TWINNING APPLICATIONS.
I402
OFF TIME SWITCH 1
90 SEC. OFF
120 SEC. OFF
160 SEC. ON
180 SEC. ON
FIGURE 24
HONEYWELL E2001
BLOWER OFF TIMINGS
(TIMER IS
RED BLOCK
ON BOARD)
OFF TIME SWITCH 1
90 SEC. ON
120 SEC. OFF
160 SEC. OFF
180 SEC. ON
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 SEVERE
PERSONAL INJURY OR DEATH.
The blower motor is wired for blower
speeds required for normal operation
as shown.
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
FIGURE 25
UTEC - 925
BLOWER OFF TIMINGS
OFF TIME
90 SEC.
120 SEC.
160 SEC.
180 SEC.
SWITCH 2
ON
OFF
OFF
ON
INPUT
BTU/HR
45,000
50,000
67,500
75,000
I335 100,000
SWITCH 2
125,000
OFF
150,000
OFF
ON
Input BTU/HR =
ON
(TIMER IS
RED BLOCK
ON BOARD)
I335
SWITCH 1 SWITCH 2
OFF ON
OFF OFF
ON OFF
ON ON
TABLE 4
METER TIME IN MINUTES AND SECONDS FOR NORMAL
INPUT RATING OF FURNACES EQUIPPED FOR NATURAL
OR LP GAS
METER
HEATING VALUE OF GAS BTU PER CU. FT.
SIZE
900 1000
CU. FT.
MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC.
ONE 1 12 1 20
TEN 12 0 13 20 13
ONE 1 5 1 12
TEN 10 50 12 00 12
ONE 0 48 0 53
TEN 8 0 8 53
ONE 0 44 0 48
TEN 7 12 8 0
ONE 0 33 0 36
TEN 5 24 6 0
ONE 0 26 0 29
TEN 4 19 4 48
ONE 0 31 0 24
TEN 3 36 4 0
Heating Value of Gas (BTU/Ft
Time in Seconds (for 1 cu.ft.) of Gas
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 exceed the
maximum outlet air temperature
specified for the unit.
IMPORTANT: Always check air
temperature rise after changing the
heating speed for any reason.
ADJUSTING OR CHECKING
FURNACE INPUT
The maximum gas supply pressure to
the furnace should be 7 W.C. for
natural gas. The minimum gas supply
pressure for purposes of input
adjustment to the furnace should be 5
W.C.
A properly calibrated manometer or
gauge is required for accurate gas
pressure readings.
The manifold pressure should be set at
3.5 W.C. for natural gas. Only small
variations in the gas flow should be
made by means of the pressure
regulator adjustment. In no case
should the final manifold pressure vary
more than plus or minus 0.3 W.C.
from the above specified pressures.
To adjust the pressure regulator:
1. Remove the regulator cap.
2. Turn the adjustment screw
clockwise to increase pressure or
counterclockwise to decrease
pressure.
3. Replace the regulator cap securely.
1040 1100 2500
1 23 1 28 3 20
50 14 40 33 20
1 15 1 18 3 20
30 13 12 30 00
0 55 0 59 2 13
9 15 9 50 22 13
0 50 0 53 2 0
8 19 8 48 20 0
0 38 0 40 1 30
6 15 6 36 15 0
0 30 0 32 1 12
5 0 5 17 12 0
0 25 0 26 1 0
4 10 4 20 10 0
3 ) x 3600
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