38
A06666
Fig. 47 --- Gas Control Valve
BURNER
ORIFICE
A93059
Fig. 48 --- Orifice Hole
R Y W G
10 TURNS
THERMOSTAT SUBBASE
TERMINALS WITH
THERMOSTAT REMOVED
(ANITICIPATOR, CLOCK, ETC.,
MUST BE OUT OF CIRCUIT.)
HOOK-AROUND
AMMETER
EXAMPLE:
5.0 AMPS ON AMMETER
10 TURNS AROUND JAWS
=
0.5 AMPS FOR THERMOSTAT
ANTICIPATOR SETTING
FROM UNIT 24-V
CONTROL TERMINALS
A96316
Fig. 49 --- Amp. Draw Check With Ammeter
FURNACE OVERHEATING HAZARD
Failure to follow this caution may result in reduced furnace
life.
Recheck temperature rise. It must be within limits specified
on the rating plate. Recommended operation is at the
midpoint of rise range or slightly above
CAUTION
!
6. Set thermostat heat anticipator.
a. Mechanical thermostat -- Set thermostat heat
anticipator to match the amp. draw of the electrical
components in the R--W circuit. Accurate amp. draw
readings can be obtained at the wires normally
connected to thermostat subbase terminals, R and W.
The thermostat anticipator should NOT be in the
circuit while measuring current. (1.) Remove
thermostat from subbase or from wall. (2.) Connect an
amp. meter as shown in Fig. 48 across the R and W
subbase terminals or R and W wires at wall.
(3.) Record amp. draw across terminals when furnace
is in heating and after blower starts.
(4.) Set heat anticipator on thermostat per thermostat
instructions and install on subbase or wall.
b. Electronic thermostat: Set cycle rate for 4 cycles per
hr.
7. Adjust blower off delay The blower off delay has 4
adjustable settings from 90 sec to 180 sec. The blower off
delay jumpers are located on the furnace control board.
(See Fig. 25.) To change the blower off delay setting,
move the jumper from one set of pins on the control to the
pins used for the selected blower off delay. Factory off
delay setting is 120 sec.
8. Set airflow CFM for cooling Select the desired blower
motor speed lead for cooling airflow. See Table 5--Air
Delivery--CFM (With Filter). See Table 9 for lead color
identification.
58ST
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