Atwood Mobile Products 2540 System Checks, THERMOSTAT INSTALLATION MODEL 2H2C, Diagnostic Chart

THERMOSTAT INSTALLATION (MODEL 2H2C)

FURNACE - MODEL 2540 MUST USE THIS THERMOSTAT

The thermostat is very sensitive. HANDLE WITH CARE AT ALL TIMES.

Locate thermostat 48˝ to 54˝ above floor on an INTERIOR wall. Pick a dry area where air circulation is good. EXTERIOR wall location must have a 3/4˝ spacer between thermostat and exterior wall.

1.Be sure all electrical power has been disconnected from the air con- ditioner, furnace and the power supply.

2.Do not install the thermostat where there are unusual heating condi- tions: such as direct sunlight, heat producing appliances (television, radio, wall lamp, etc.) or a furnace or air conditioner supply register.

3.ATTACHING THE WALL THERMOSTAT. Separate the thermostat body from the sub-base by gently squeezing the top and bottom. Pull wires through access hole in base plate. Attach thermostat sub-base to the wall at the desired mounting location. Mount the sub-base to the wall before connecting the wires. See instruction provided with thermostat.

SYSTEM CHECKS

NOTE: A SOFT lockout is a condition that is timed and will make addition- al attempts to correct the problem. A HARD lockout requires reset of the thermostat or turning the power switch off then back on.

PROPANE GAS PRESSURE TEST

The furnace and any individual shut-off valve must be disconnected from gas supply piping system during any pressure testing of system at test pressures of more than 1/2 PSI.

Before furnace is connected piping systems must be tested to be leak free. The test must maintain air pressure of at least 6˝ of mercury or 3 PSI for at least 10 minutes.

The entire piping system must be maintained within a range of 10-14˝ W.C. when all appliances are in operation. Test gas connections for leakage with a leak test solution.

STATIC PRESSURE TEST

CASING STATIC PRESSURE TABLE

If duct static pressure cannot be set, casing static pressure should not exceed the values listed below when taken cold.

￿WARNING

FIRE OR EXPLOSION

•Never check for leaks with an open flame.

DIAGNOSTIC CHART

A diagnostic LED is located inside the exterior access cover on the out- side edge of the horizontal (2) stage control board. The following graph defines the codes.

NUMBER OF LED FLASHES	DIANOSTIC INFORMATION	LOCKOUT
1	Low Input voltage	SOFT
2	Ignition Failure	SOFT
3	Open High Limit	SOFT
4	Stuck Sail Switch	HARD
5	Module Fault	HARD

DUCTING SYSTEM	OPERATING VOLTS	FLEXIBLE	HARD
DC MODELS	12	0.25˝ W.C.	0.35˝ W.C.

Voltage greater than indicated will cause higher static readings. Reducing the number of duct turns and stretching ducts will increase air flow and reduce static pressure. Adding ducts or increasing dis- charge system (hard ducting) will also reduce static pressure. NOTE: Special tool required to take casing static pressures.

Location for Static Pressure Tap for casing is on the back of casing (top left corner) (FIG 3).

2-STAGE - MODEL 2540

4 WIRING

ELECTRONIC

DIGITAL

THERMOSTAT

MOTOR

RED

BLACK

YELLOW

+12 VDC				RED
+THERMO		1	1
		2	2	BLUE
-12 VDC		3	3	YELLOW
		4	4
-THERMO
				GREEN
		5	5
		6	6
	BULK HEAD
	CONNECTOR

CUSTOMER SUPPLIED WIRE

￿

WHITE

LIMIT SWITCH

RED
	IGNITION￿	ELECTRODE
DUAL	CONTROL	CHASSIS
CONTROL
		GROUND
6 5 4 3 21
WHITE		HIGH TENSION
BLACK	ORANGE	RED
	BLUE
	YELLOW

BROWN

SAIL￿

SWITCH

CHASSIS

GROUND

IMPORTANT: If any original wire has to	VALVE
be replaced, it must be replaced with
type 105˚C or it's equivalent.

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