Reznor MAPS - A,B,C Users Manual Manual de usuario descargar pdf (Pagina 25)

Form O-MAPSIII&IV Cabinets A/B/C, P/N 257004R8, Page 25

4.2 Heat Section

Controls

4.2.1 General

The heat section controls are in the low voltage compartment. See FIGURE 1, page 5.

4.2.2 Ignition System

for Modulating Gas

Control

FIGURE 14A -

Ignition Control

Module (Deep

Modulation Board)

in the Electrical

Compartment

Normal Furnace Operation (LED 3-Character Display in FIGURE 14A)

LED Display Heat Mode Description

OFF Mode (OFF) System Idle - Control board has power, no faults found, no call for heat.

PURGE Mode

(Pur)

System is purging the heat exchanger – No gas on, no ame, inducer runs for

the specied purge timings. Purge cycles occur immediately before and after

each burner operation.

IGNITION Mode

(Ign)

System is initiating burner operation – Igniter energized, modulating valve

moved to ignition setting, gas on. Maintained for the trial-for-ignition period

and the ve second ame stabilization period.

WARM-UP Mode

(HEA)

Period between Ignition and Run – System checks completed before

modulation control begins.

RUN Mode (run) Normal modulating operation.

Ignition Retry (rEt)

System has had a failed ignition attempt or has lost ame during burner

operation and is beginning another ignition cycle.

The control has a built-in, self-diagnostic capability. The control continuously monitors

its own operation and the operation of the heat section including direct spark ignition,

safety and modulating valves, and venter motor speed. The 3-digit display on the con-

trol indicates the current system state, warnings, failures, and test modes.

Controller LED Information (displayed on power up)

Display Info (example only) Description

C CAb Furnace series or model name, for example, "C cabinet

series"

400 Heat Section Size

nAt or LP Fuel type

1.01 Software version

The control module is located in the control compartment with an additional board to

control spark that is attached directly to the side of the burner. Do not attempt to disas-

semble either board. However, each heating season check the lead wires for insulation

deterioration and good connections.

If replacement is required, these boards must be replaced with identical parts.

3-Character Display

Plug

IMPORTANT: The control

module is P/N 257246 for

all sizes of MAPS

III&IV

Cabinet C heat sections

and P/N 258319 on all

MAPS

III&IV Cabinet

A and B heat sections.

However, the ID plug on

each board is unique for

each size of heat section.

A replacement board will

require either a new ID plug

or reuse of the ID plug from

the board being replaced.

NOTE: Operating and

Lockout Error Codes

displayed on ignition

controller 3-character

display (FIGURE 14A) are

listed in Troubleshooting

Paragraph 7.3.3.

FIGURE 14B - Spark

Ignition Board,

P/N 257975

Spark Board is attached

to the side of the burner.

CAUTION: Due to high

voltage on the spark wire

and electrode, do not

touch when energized. See

Hazard Levels, page 3.

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 39 40

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