Carrier 58MVP 170 Series, Руководство по устранению неисправностей

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STEP ACTION YES NO GO TO
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Turn power on and depress door switch. Use a piece of
tape to hold switch closed.
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45 Jumper R and W/W1 thermostat terminals. 46
46 Does status code 33 occur during low heat? 47 57
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Clean or replace filter if necessary, then recycle furnace
after limit resets.
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Observe furnace operation for 25 minutes or until status
code 33 starts flashing.
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49 Does status code 33 occur? 50 10
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Is furnace considerably overfired (10or more)? Clock input
rate. Do not use manifold pressure method unless using
propane.
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Ensure gas inlet pressure and burner orifices (natural or
propane) are correct. Then adjust gas valve to proper rate
per Installation, Start-Up, and Operating Instructions. If it
cannot be adjusted to proper rate, replace gas valve.
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52 Is temperature rise within rise range? 54 53
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Does the installation have a bypass humidifier or zoning
system bypass?
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Turn power off and install a temperature probe in front of
limit switch button.
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Turn power on and cycle unit. Does limit switch open at a
temperature at least 10 deg. F below temperature setpoint
for limit switch? (EXAMPLE: The setpoint is 220 deg F, but
the switch opens at a temperature below 210 deg F.)
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The problem may be related to poor air distribution or ex-
cessive pressure drop across filter. Check filter and return-
air grilles for blockage. Add turning vanes, more supply
openings, or more return-air openings. Use Appendix D to
evaluate external static pressure.
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57 While the unit is operating in low heat jumper R and W2. 47
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With blower access panel in place record temperature rise
across return air duct before and after the bypass.
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59 Is temperature rise from bypass greater than 15 deg. F? 60 61
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The bypass is oversized. Adjust damper or replace with
properly sized bypass.
10
61 Does installation have modulating zone dampers? 62 66
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Disable modulating zone damper system with all dampers
in open position except bypass damper. If installation is
equipped with a bypass damper, it should be in the closed
position.
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Turn power off and disconnect jumper from the R thermo-
stat terminal. Turn power back on and reconnect jumper to
R thermostat terminal. Observe for 15 minutes with the
blower access panel in place.
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64 Does status code 33 flash? 66 65
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The problem is caused by the modulating zone damper sys-
tem. Check the zoning system manufacturer’s Installation
and Troubleshooting guide for corrective action.
10
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Turn power off and install a temperature probe in front of
limit switch button.
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Turn power on and cycle unit. Does limit switch open at a
temperature at least 10 deg. F below temperature setpoint
for limit switch? (EXAMPLE: The setpoint is 220 deg F, but
the switch opens at a temperature below 210 deg F.)
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Adjust the blower airflow using dip switch SW1-3 and
SW1-4 to get the temperature rise within the rise range.
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