International comfort products R80ESN Installation Instructions Manual page 33

d. Turn gas valve ON/OFF switch to ON.
e. Manually close blower door switch.
f. Set thermostat to call for heat.
g. Remove regulator seal cap and turn regulator adjusting
screw counterclockwise (out) to decrease input rate of
clockwise (in) to increase input rate.
h. Install regulator seal cap.
i. Leave manometer or similar device connected and pro-
ceed to Step 4.
NOTE: DO NOT set manifold pressure less than 3.2- -In. W.C. or
more than 3.8- -In. W.C. for natural gas at sea level. If manifold
pressure is outside this range, change main burner orifices. Refer
to Table 10, 11, 12 and 13.
NOTE: If orifice hole appears damaged or it is suspected to have
been redrilled, check orifice hole with a numbered drill bit of
correct size. Never redrill an orifice. A burr- -free and squarely
aligned orifice hole is essential for proper flame characteristics.
4. Verify natural gas input rate by clocking meter.
NOTE: Gas valve regulator adjustment cap must be in place for
proper input to be clocked.
a. Turn off all other gas appliances and pilots served by the
meter.
b. Run furnace for 3 minutes in heating operation.
c. Measure time (in sec) for gas meter to complete 1 revolu-
tion and note reading. The 2 or 5 cubic feet dial provides
a more accurate measurement of gas flow.
d. Refer to Table 12 for cubic ft. of gas per hr.
e. Multiply gas rate (cu ft./hr) by heating value (Btuh/cu ft.)
to obtain input.
If clocked rate does not match required input from Step 1,
increase manifold pressure to increase input or decrease manifold
pressure to decrease input. Repeat steps b through e until correct
input is achieved. Reinstall regulator seal cap on gas valve.
5. Set temperature rise. The furnace must operate within the
temperature rise ranges specified on the furnace rating
plate. Do not exceed temperature rise range specified on
unit rating plate. Determine the temperature rise as fol-
lows:
NOTE: Blower access door must be installed when taking
temperature rise reading. Leaving blower access door off will
result in incorrect temperature measurements.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Disconnect 115- -v electrical power and install lockout tag
before changing speed tap.
a. Place thermometers in return and supply ducts as close
to furnace as possible. Be sure thermometers do not see
radiant heat from heat exchangers. Radiant heat affects
temperature rise readings. This practice is particularly im-
portant with straight- -run ducts.
b. When thermometer readings stabilize, subtract return- -air
temperature from supply- -air temperature to determine air
temperature rise.
NOTE: If the temperature rise is outside this range, first check:
(1.) Gas input for heating operation.
(2.) Derate for altitude if applicable.
441 01 6200 00
c. Adjust air temperature rise by adjusting blower speed. In-
d. Turn thermostat down below room temperature and re-
e. To change motor speed selection for heating, remove
f. If the same motor speed tap is needed for heating and
g. Repeat steps a through e.
h. When correct input rate and temperature rise is achieved,
i. Remove manometer or similar device from gas valve.
j. Reinstall manifold pressure tap plug in gas valve.
Specifications are subject to change without notice.
(3.) Return and supply ducts for excessive restrictions
causing static pressures greater than 0.50- -In. W.C.
crease blower speed to reduce temperature rise. Decrease
blower speed to increase temperature rise
move blower access door.
blower motor lead from control HEAT terminal (See Fig.
24.) Select desired blower motor speed lead from one of
the other terminals and relocate it to the HEAT terminal
(See Table 5 for lead color identification). Reconnect
original lead to SPARE terminal.
cooling, a Jumper Wire accessory kit is available, see
Product Data sheet for the current Jumper Wire accessory
part number. The single wire end of the jumper will be
connected to the desired blower motor speed lead. The
two wire end of the jumper will be connected to the con-
trol board, connecting one wire to the HEAT (heating
blower tap) terminal and the other will be connected to
the COOL (cooling blower tap). Use the provided wire
ties to secure the loose blower motor speed lead and any
other loose wires, being careful not to put tension on any
wire connectors.
turn gas valve ON/OFF switch to OFF.
Fig. 41 - - Gas Control Valve
A06666
33