Set Temperature Rise - Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual

REGULATOR
Tab{e 11-ARRude Derate MuRipler for U.S.A.
ON/OFF SWITCH
INLET
PRESSURE TAP
REGULATOR
ADJUSTMENT
SCREW
REGULATOR SPRING
(PROPANE - WHITE 6 TURNS
NATURAL - SILVER, 10 TURNS)
GAS PRESSURE
REGULATOR
ADJUSTMENT
ALTITUDE PERCENT
(FT} OF DERATE
0=2000 0
2001=3000 4-6
3001 =4000 6-8
4001=8000 8-10
8001=6000 10-12
6001=7000 12-14
7001=8000 14-16
8001=9000 16-18
9001=t0,000 18-20
* Derate multiplier factors are based on midpoint altitude
BERATE MULTIPUER
FACTOR*
1.00
0.95
0.93
0.91
0.89
0.87
0.85
0.83
0.81
for altitude range
MANIFOLD
PRESSURE TAP
A03142
Fig. 87--Redundant Automatic Gas Control Valve
\
--BURNER J
ORIFICE
Fig. 88--Orifice Holes
BURNER FLAME J_
f_
F
BURNER
MANIFOLD J
Fig. 59--Burner Flame
A93059
A89020
c. Gas valve regulator seal cap MIST be on
d. Turn off all other gas applications and pilots
e. Start fi/rnace and let operate _br 3 minutes.
£ Measure time (in sec) for gas meter to dial to complete 1
revolution,
g. Refer to Table 12 %r cu ft of gas per hr.
h. Multiply gas rate (cu fl&r) X heating value (Bmicu ft)
using natural gas heating value fiom local gas
utility/supplier.
EXAMPLE: (0=2000 ft altitude)
Furnace input t)om rating plate is 100,000 Btuh.
Bm heating input Bmicu ft X cu fthr
Heating value of gas 975 Btuicu _l
Time _br 1 revolution of 2=cu ft dial 70 sec
Gas rate 103 cu ft&r (from Table 12)
Btu heating input 103 X 975 100,425 Bmh.
In this example, the orifice size and manifbld
pressure adjustment is within ÷2 percent of the
_;arnace input rate
48
SET TEMPERATURE RISE
UNIT DAMAGE HAZARD
Failure to fbllow d_is caudon may result in overheating the
heat exchangers or condensing flue gases in heat exchanger
areas not designed for condensate.
Temperature rise must be within limits specified on t:urnace
rating plate. Recommended operation is at mi@oint of rise
range or slightly above.
Determine and adjust air temperature rise as _bllows:
1. Place them_ometers in return and supply ducts as close to
f_ultace as possible Be sure thermometers do not see heat
exchangers so that radiant heat does not affect readings This
practice is particularly important with straight=run ducts.
2. When thermometer readings stabilize, subtract return-air tem-
perature from supply=air temperature to detemaine air tem-
perature rise.
3. Adjust temperature rise by adjusting blower speed. Increase
blower speed to reduce temperature rise. Decrease blower
speed to increase temperature rise.
ELECTRICAL SHOCK HAZARD
Failm'e to _Bllow this warning could result in personal in3u W
or death.
Disconnect 115=v electrical power before changing speed tap.
4. To change blower motor speed selections for heating mode,
remove blower motor lead fiom control HEAT terminal. (See
Fig. 31.) Select desired blower motor speed lead fi'om 1 of the