York SUNLINE PLUS D1EG Instrucciones de operaciones descargar pdf (Pagina 14)

is not detected, then "IC1" will lock out first stage furnace

operation until 24V power is removed from the module either

at the unit or by resetting the room thermostat.

At the same time power was supplied to the “RW1”, a parallel

circuit activates "TDR" which closes the "TDR" contact after

approximately 16 seconds and energizes "K5" which closes

"K5-2" and starts the blower by energizing "3M".

When "TH2" closes, heat relay "RW2" is energized. The

"RW2-1" contact is closed energizing the second stage ignition

module "IC2". "IC2" will immediately start the second stage

ignitor sparking and will open the redundant valve located

inside the second stage main gas valve "GV2" to allow a flow

of gas to the second stage carryover tube. See Figure 11. Only

after the pilot flame has been ignited and the presence of pilot

flame detected at "IC2" by a signal sent back through the flame

sensor is sparking terminated and the main gas valve opened.

Gas flows into each of the second stage main burners and is

ignited from the carryover tube flame.

If "IC2" fails to detect a pilot flame, it will continue to try for a

maximum of 85 seconds to ignite the pilot tube. If the pilot flame

is not detected, then "IC2" will lock out first stage furnace

operation until 24V power is removed from the module either

at the unit or by resetting the room thermostat.

Note that the

second stage furnace can operate even if first stage has locked

out.

When the heating cycle is complete, “TH2" opens

de-energizing the ”RW2" then "TH1" opens de-energizing

"RW1" and "TDR", thus closing all gas valves. The blower motor

will continue to run (approximately 26 seconds after the furnace

is shut down) until “TDR” opens, de-energizing the “K5" relay

and ”3M" contactor.

SAFETY CONTROLS

The control circuit includes the following safety controls:

Limit Control (LS). This control is located inside the heat

exchanger compartment and is set to open at the tempera-

ture indicated in Table 10. It resets automatically. The limit

switch operates when a high temperature condition, caused

by inadequate supply air flow occurs, thus shutting down

the ignition control and closing the main gas valves and

energizing the blower.

Centrifugal Switch (CS). If the draft motor should fail, the

centrifugal switch attached to the shaft of the motor

prevents the ignition controls and gas valves from being

energized.

Redundant Gas Valve. There are two separate gas valves

in the furnace. Each valve contains a main and a redundant

valve. The redundant valves are located upstream of the

main gas valves. Should either or both of the main gas

valves fail in the open position the redundant valves serve

as back-ups and shuts off the flow of gas.

Flame Sensor Rod / 100% Ignition Control Lock-Out. The

flame rods and controls are located per Figure 12. If an

ignition control fails to detect a signal from the flame sensor

indicating the pilot flame is properly ignited, then the main

gas valve will not open. It will continue to try and ignite the

pilot for a maximum of 85 seconds, then if the pilot flame is

not detected, the ignition control will lock out furnace op-

eration until 24V power is removed from the module either

at the unit or by resetting the room thermostat.

Rollout Switch. This switch is located above the main burn-

ers in the control compartment which in the event of a

sustained main burner rollout shuts off and locks out

both

ignition controls closing both gas valves. The ignition con-

trols lock out furnace operation until 24V power is removed

from the controls either at the unit or by resetting the room

thermostat.

Note the auto reset rollout switch must reset

before allowing furnace operation.

HEAT ANTICIPATOR SETPOINTS

It is important that the anticipator setpoint be correct. Too high

of a setting will result in longer heat cycles and a greater

temperature swing in the conditioned space. Reducing the

value below the correct setpoint will give shorter “ON” cycles

and may result in the lowering of the temperture within the

conditioned space.

PRE-START CHECK LIST

Complete the following checks before starting the unit.

1. Check the type of gas being supplied. Be sure that it is the

same as listed on the unit nameplate.

2. Make sure that the vent and combustion air hoods have

been properly installed.

Units

(Tons)

Capacity, MBH

Limit Control

Opens, ÉF

Input Output

15 & 20 300 240 195

15 & 20 400 320 195

TABLE 12 - LIMIT CONTROL SETTING

GAS

VALVE

GAS MAIN

MAIN VALVE

TO MAIN

BURNER

REDUNDANT

VALVE

TO PILOT BURNER

FIG. 11 - GAS VALVE PIPING

Gas Valve

Anticipator Setpoint

1st Stage 2nd Stage

Honeywell

VR8440

0.30 amp 0.11 amp

White-Rodgers

36C68

FIG 12-GAS VALVE AND CONTROLS

530.22-N6Y

14 Unitary Products Group

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 20 21

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