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ON/OFF SWITCH

1/2" NPT INLET

_ _ _,_ ....... PLASTICADJUSTSCREW

(Propane - White,

Natural - Silver)

4/2" NPT OUTLET _

A07804

Fig. 3 - Two-Stage Gas Valve

18. Using a screwdriver, remove plastic adjust screws from both

high and low stage gas regulators (see Fig. 3). Save plastic

adjust screws.

19. Remove regulator springs (silver) from both high and low

stage gas regulators (see Fig. 3). Discard regulator springs.

20. Install propane gas regulator springs (white) shipped with

this kit. One into the low stage gas regulator and one into

the high stage gas regulator (see Fig. 3).

21. Install plastic adjust screw into the high stage gas regulator.

turn clockwise 13.5 turns (see Fig. 3).

22. Install plastic adjust screw into the low stage gas regulator.

turn clockwise 9.5 turns (see Fig. 3).

23. Verify igniter, flame sensor, orifice/main burner

relationship prior to completing conversion. (See Fig. 4.)

Partially slide burner rack assembly into unit.

24. Disconnect the orange wire from the combustion air

pressure switch and connect it to the orange wire on the low

gas pressure switch (LGPS) equipped with a 1/4 in. male

quick-connect terminal. The low gas pressure switch

should have one unconnected orange wire remaining.

Connect this wire to the vacant terminal on the combustion

air pressure switch (see Fig. 11).

25. Reconnect the violet wires removed in item 5 to the rollout

switch and reinstall the rollout switch.

26. Reconnect orange sparker cable to sparker and reconnect

the white flame sensor wire to the flame sensor.

27. Reconnect the remaining wires removed in item 5 to the gas

valve. Connect the gray wires to (HI). Connect the blue

wires to (M). Connect the brown and green/yellow wires to

(C).

28. Slide burner rack assembly into base pan. Align burner rack

with screws on sheet metal partition and slide assembly

back tight to the partition. Replace the screw attaching the

burner rack to the base pan removed in step 4. If the Fan

partition mounting bracket was removed, slide bracket back

into placed and fasten with 2 screws. (See Fig. 2.)

29. Reconnect the brown wire from the burner assembly to the

fan partition panel, using the ground screw saved from Step

30. Remove the 1/8 in. pipe plug on the gas manifold and

connect a pressure manometer (see Fig. 4).

ORIFICE_

0 ?2IN [5 5MM]

0 lOIN [/8 2M}ql

-- FLAME

SENSOR

-- I6NITOR

1 57I [34 8k41qMAX]

AO7889

Fig. 4 - Two-Stage Igniter, Flame Sensor, Orifice/Main

Burner Relationship

31. Reconnect electrical power and gas supply to the unit. For

propane applications, the gas pressure must not be less than

11.0 IN. W.C. or greater than 13 IN. W.C. at the unit

connection. A 1/8-in. NPT plugged tapping, accessible for

test gauge connection, must be installed immediately

upstream of the gas supply connection to the gas valve and

downstream of manual equipment shutoff valve.

The newly installed low gas pressure switch is a safety device used

to guard against adverse burner operating characteristics that can

result from low gas supply pressure. Switch opens at not less than

6.5 IN. W.C. and closes at not greater than 10.2 IN. W.C.

This switch also prevents operation when the propane tank level is

low which can result in gas with a high concentration of impurities,

additives, and residues that have settled to the bottom of the tank.

Operation under these conditions can cause harm to the heat

exchanger system.

This normally open switch closes when gas is supplied to gas valve

under normal operating pressure. The closed switch completes

control circuit. Should an interruption or reduction in gas supply

occur, the gas pressure at switch drops below low gas pressure

switch setting, and switch opens. Any interruption in control

circuit (in which low gas pressure switch is wired) quickly closes

gas valve and stops gas flow to burners.

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Carrier 48EZ(N)-A Specifiche Pagina 5

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