Carrier 58BB - Manual (Page 8)

IMPORTANT; Remove shippmg pad from
motor moiintkig angle before operating blower.
Initial Start-Up
When first lighting furnace pilot:
1. Open all warm air registers.
2. Set room thermostat to lowest setting.
3. If humidifier is installed with system, open
water supply valve.
4. If line voltage switch is provided in furnace
circuit, turn it to “Off” position.
5. Turn gas cock dial (see Fig. 7 and Fig. 8) to
“Off” position.
6. Wait approximately 5 minutes to allow gas
wliich may have accumulated in burner com­
partment to escape.
7. Turn gas cock dial to “Pilot” position.
8. On Unitrol 7000 valves, depress and hold gas
cock dial while lighting pilot burner. If valve is
equipped for 100% shutoff, allow pilot to burn
a p p r o x i m a t e l y one-half minute before
releasing dial (Unitrol 7000 valve) or before
depressing automatic pilot reset button (Essex
TF 555 valve). If pilot does not remain lighted,
repeat operation allowing longer period before
releasing dial or depressing button. If neces­
s a r y , a d j u s t pilot. (See Pilot Burner
Adjustment.)
9. Turn gas cock dial to “On” position.
10. Set room thermostat at desired temperature
position.
IMPORTANT; For the Unitroi 7000 models
equipped with a pressure regulator, do not
adjust gas input between “Pilot” and “On”
positions on the gas cock dial.
START-UP AND SERVICE
Pilot Burner Adjustment
1 .
2 .
3.
Remove pilot adjustment cap. (See Fig. 7.)
Adjust pilot key to provide properly sized
flame. (Ignition flame should extend outward
and upward approximately 1.5 in. from the
stem of the pilot.) Turn screw clockwise for
high flame or counterclockwise for low flame.
Replace pilot adjustment cap.
Combustion Air Adjustment
Primary air shutters are provided on all furnaces
to enable adjustment of the primary air supply to
get proper flame characteristics. Adjust the air
shutters as follows;
1. After furnace has been operating for 15
minutes, loosen air shutter screw on each
burner face.
2
.
3.
Close air shutter until yellow tips appear in
flame. Then, open air shutter until yellow tips
disappear and flame has soft blue cone.
Secure air shutters in position by tightening
each air shutter screw.
Blower Speed Adjustment
Adjust on installation for nameplate tempera­
ture rise. (See Table 1.)
1. For direct drive speed change (58BB furnaces),
perform the following;
a. Rotate speed-change plug or move line lead
from fan switch to desired speed terminal.
When plug is rotated, desired speed marking
should face away from motor shaft.
Speeds on plug are marked. High (•),
Medium-High (••), Medium-Low (•••), and
Low (••••)
b. For speed selection on direct drive model
with terminal connections, change terminal
at motor. (See Fig. 5 and Fig. 6.)
C
GAS COCK DIAL
PILOT
CONNECTION
OUTLET
(NOT VISIBLE)
AUTOMATIC
PILOT RESET
BUTTON*
PRESSURE TAP
(NOT VISIBLE)
PILOT ADJUSTMENT
CAP
VENT
REGULATOR ADJUSTMENT
SCREW CAP
GAS COCK DIAL
PILOT
CONNECTION
PILOT
ADJUSTMENT
CAP
thermocouple
CONNECTION
VENT
(NOT VISIBLE)
REGULATOR
ADJUSTMENT
SCREW CAP
- outlet
(NOT VISIBLE)
PRESSURE TAP
(NOT VISIBLE)
ESSEX TF 555
(Used on 58BB Furnaces)
UNITROL 7000
(Used on 58BD Furnaces)
•"Available only on valves equipped for 100% shutoff.
Fig. 7 — Combination Gas Valves