Engineered air DJ Series User Manual download pdf (Page 12)

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OPERATING FUNCTIONS:

The three major heating and/or cooling functions of DJ (E,P) units are as follows:

Furnace Operation: Defined as space heating or cooling controlled by sensing the space temperature and heating the

return air.

Make-Up Operation: Defined as heating or cooling outside air, controlled by sensing the discharge air temperature.

Heat-Vent Operation: Defined by the heating or cooling of mixed outside and return air, controlled by sensing the space

temperature.

A description of the unit functions and operations are shown on the unit wiring diagram. Carefully check your wiring diagram

to verify that all remote controls are properly located and correctly field wired.

COMPONENT DESCRIPTION:

The following list is intended to describe the type, function and set point of the most commonly used standard and optional

components on PACK units. The unit wiring diagram will indicate which components are used in this unit. Refer to

component manufacturers bulletins supplied in an envelope with this unit for more information.

a) GAS TRAIN

1. PILOT BURNER: Provides pilot gas connection, flame sensor and ignition rod for intermittent or interrupted pilot

applications.

2. COMBINATION VALVE: Combines manual gas shutoff, one stage electric main operating valve and pressure regulation

in one body. Combination valves for spark ignition applications also incorporate an electric pilot valve. Two stage

models provide 50% (low fire), and 100% (high fire) capacities.

3. MECHANICAL MODULATION VALVE: The mechanical modulation valve graduates the flow of gas to the main burner,

depending on the demands of the sensing bulb which is located in the discharge air stream. Inputs are varied from 40%

through 100% of full rate in direct response to the modulating control sensing element and depending on the

temperature of the air leaving the furnace. Discharge air temperature can be maintained within a range of 60

F to 100

(16

C to 38

C) and is adjustable at the mechanical modulating valve.

b) ELECTRICAL

1. FLAME IGNITION CONTROL: Is a device to permit the main gas valve to only open when the pilot burner is proven to

be lit. The ignition control provides the high voltage spark to ignite the pilot gas and also acts as the flame safety device.

After ignition of the pilot gas, the ignition control electronically senses the pilot flame from a separate solid metal probe

in the pilot burner.

2. SINGLE OR TWO STAGE DUCTSTAT: Provides single or two stage heat control of the discharge air of furnace.

Ductstat is mounted in burner cabinet with sensing bulb mounted in outlet. Ductstat is adjustable between 55 Deg.

and 100 Deg. F. (13 Deg. and 38 Deg. C). Set differential at 6 to 8 Deg. F (3-4 Deg. C).

3. SINGLE OR TWO STAGE THERMOSTAT: Provides single or two stage heat control of furnaces by sensing room

temperature. Thermostat is adjustable between 50 Deg. and 95 Deg. F (10 Deg. and 35 Deg. C.). Check current

draw through thermostat and set heat anticipation at the same value.

4. ELECTRONIC HEATING CONTROLLER (MAXITROL- NATURAL & PROPANE GAS):

a) REMOTE SELECTOR: Provides remote manual selection of the discharge air temperature of a furnace when

equipped with electronic modulating valve, amplifier and discharge air sensor. Temperature selection range is 55

Deg. to 90 Deg. F. (13 Deg. to 32 Deg. C). Selector is not temperature sensitive.

b) ROOM OVERRIDE THERMOSTAT: Provides automatic switching to high fire when room override temperature

drops below set-point. The space temperature selection range is 50 Deg. to 80 Deg. F (10 Deg. to 20 Deg. C).

5. ENGINEERED AIR FAMILY OF CONTROLLERS (CTRAC OR DJT): The appropriate information brochures on these

specialized controls have been included in each unit. Only a qualified service person who is familiar with these

controllers should service them.

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Engineered air DJ Series User Manual Page 12

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