Normal Sequence Of Operation - Daikin DSG Series Installation Instructions Manual

Light commercial packaged gas unit

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Wiring diagram (20 pages)

Table of Contents

ating temperature. A manometer should be connected to the

gas valve to verify pressure is within the specified range (see

following figures for manometer connections). Clockwise

rotation of the pressure regulator screw increases pressure

and gas flow rate. Turn screw counterclockwise to decrease

pressure and gas flow rate. After adjustment the furnace

temperature rise must be within the range specified on the

unit data plate. NOTE: Thermal efficiency of the furnace is a

product efficiency rating determined under continuous oper-

ating conditions independent of any installed system.

Outlet Pressure

Tap

INLET

Inlet Pressure

Tap

White-Rodgers 36G22 - Single Stage

Open to

Atmosphere

Outlet

Pressure Boss

Inlet

Pressure Boss

White-Rodgers 36G54 (2-Stage) Connected to Manometer

Pressure Adjustments

To connect manometer to gas valve:

1. Back outlet pressure test screw (inlet/outlet pressure

boss) out one turn (counterclockwise, not more than one

turn).

2. Attach a hose and manometer to the outlet pressure boss

of the valve.

To remove manometer from gas valve:

1. Remove manometer hose from outlet pressure boss.

2. Turn outlet pressure test screw in to seal pressure port

(clockwise, 7 in-lb. minimum).

Pressure Regulator

Adjustment

(Under Cap Screw)

OUTLET

Gas Valve

On/Off

Selector

Switch

High Fire Regulator

Adjust

Regulator

Vent

Low Fire

Regulator Adjust

3. Turn on electrical power and gas supply to the system.

4. Turn on system power and energize valve.

5. Using a leak detection solution or soap suds, check for

leaks at pressure boss screw. Bubbles forming indicate a

leak. SHUT OFF GAS AND FIX ALL LEAKS IMMEDIATE-

LY.

O PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE

GAS MANIFOLD PRESSURE MUST BE AS SPECIFIED ON THE UNIT

. O

RATING PLATE

NLY MINOR ADJUSTMENTS SHOULD BE MADE BY

ADJUSTING THE GAS VALVE PRESSURE REGULATOR

6. Relight all other appliances turned off in step 1. Be sure all

pilot burners are operating.

Main Burner Flame Check

Flames should be stable, soft and blue (dust may cause or-

ange tips but they must not be yellow) and extending directly

outward from the burner without curling, floating or lifting off.

NOx Screen Check

Verify that the alignment of the NOx screens is at 6 o' clock.

In jurisdictions that do not require low NOx emissions, NOx

screens may be removed.

Temperature Rise Check

Check the temperature rise through the unit by placing ther-

mometers in supply and return air registers as close to the

unit as possible. Thermometers must not be able to sample

temperature directly from the unit heat exchangers, or false

readings could be obtained.

1. All registers must be open; all duct dampers must be in their

final (fully or partially open) position and the unit operated

for 15 minutes before taking readings.

2. The temperature rise must be within the range specified on

the rating plate.

NOTE: Air temperature rise is the temperature difference

between supply and return air.

With a properly designed system, the proper amount of tem-

perature rise will normally be obtained when the unit is op-

erated at rated input with the recommended blower speed.

If the correct amount of temperature rise is not obtained, it

may be necessary to change the blower speed. A higher

blower speed will lower the temperature rise. A slower blow-

er speed will increase the temperature rise.

NOTE: Blower speed MUST be set to give the correct air

temperature rise through the unit as marked on the rating

plate.