Daikin DP14U Series, Installation Instructions Manual

14

8.  Smell for gas, including near the ground. This is important 

because some types of gas are heavier than air. If you have 

waited five minutes and you do smell gas, immediately 

follow the warnings near the beginning of this manual. If 

having waited for five minutes and no gas smell is noted, 

move the gas control valve switch to the ON position.

9.  Replace the heat exchanger door on the side of the unit.
10.  Open the manual gas valve external to the unit.
11.  Turn on the electrical power supply to the unit.
12.  Set the thermostat to desired setting.

Gas Supply And Manifold Check

Gas supply pressure and manifold pressure with the burners 

operating must be as specified on the rating plate.

NOTE:

 Use adapter kit #0151K00000S to measure gas pressure 

on White-Rodgers 36J22Y gas valves.

Gas Supply Pressure Measurement

CAUTION

T

O

PREVENT

UNRELIABLE

OPERATION

OR

EQUIPMENT

DAMAGE

, 

THE

INLET

GAS

SUPPLY

PRESSURE

MUST

BE

AS

SPECIFIED

ON

THE

UNIT

RATING

PLATE

WITH

ALL

OTHER

HOUSEHOLD

GAS

FIRED

APPLIANCES

OPERATING

.

The line pressure supplied to the gas valve must be within 

the Inlet Gas Supply Pressure range specified. The supply 

pressure can be measured at the gas valve inlet pressure 

tap or at a hose fitting installed in the gas piping drip leg.  

The supply pressure must be measured with the unit OFF.  

To measure inlet pressure, use the following procedure.

White-Rodgers Model 36J22Y-204

1. 

Turn OFF gas to furnace at the manual gas shutoff valve 

external to the furnace.

2.  Turn OFF all electrical power to the system.
3.  Inlet pressure tap connections:

a.  White-Rodgers valve:
  Back inlet pressure test screw (inlet pressure tap out one 

turn (counterclockwise, not more than one turn).

4.  Connect manometer (or appropriate pressure gauge) at 

either the gas valve inlet pressure tap or the gas piping drip 

leg. See White-Rodgers 36J22Y-204 gas valve for location 

of inlet pressure tap.

5.  Turn ON the gas supply.

6.  Turn On power and operate the furnace and all other gas 

consuming appliances on the same gas supply line. 

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

leaks at screw (White-Rodgers valve). Bubbles forming 

indicate a leak. SHUT OFF GAS AND REPAIR ALL LEAKS 

IMMEDIATELY!

8. 

Measure the gas supply pressure with burners firing. Adjust 

supply pressure using the 

Inlet Gas Supply Pressure 

table 

shown below. If supply pressure reading differs from the 

table, make necessary adjustments to pressure regulator, 

gas piping size, etc., and/or consult with local gas utility.

Natural Gas

Min. 5.0" W.C., Max. 10.0" W.C.

INLET GAS SUPPLY PRESSURE

9.  Turn OFF all electrical power and gas supply to the system.
10. 

Remove the manometer hose from the hose barb fitting or 

inlet pressure Tap.

11.  Replace inlet pressure tap:

a.  White-Rodgers valve:
  Turn inlet pressure test screw in to seal pressure port 

(clockwise, 7 in-lb minimum).

12.  Retest for leaks. If bubbles form, shut down gas and   repair 

leaks immediately.

13.  If there are no leaks, turn ON electrical power and gas 

supply to the system.

14.  Turn valve switch ON.

NOTE:

 If measuring gas pressure at the drip leg, a field-supplied 

hose barb fitting must be installed prior to making the hose 

connection. If using the inlet pressure Tap on the White-Rodgers 

gas valve, then use the 36G/J Valve Pressure Check Kit, 

Goodman Part No. 0151K00000S.

Measuring Inlet Gas Pressure (Alt. Method)

Gas Manifold Pressure Measurement and 

Adjustment

T

O

PREVENT

UNRELIABLE

OPERATION

OR

EQUIPMENT

DAMAGE

, 

THE

GAS

MANIFOLD

PRESSURE

MUST

BE

AS

SPECIFIED

ON

THE

UNIT

RATING

PLATE

. O

NLY

MINOR

ADJUSTMENTS

SHOULD

BE

MADE

BY

ADJUSTING

THE

GAS

VALVE

PRESSURE

REGULATOR

.

CAUTION

Only small variations in gas pressure should be made by adjusting 

the gas valve pressure regulator. The manifold pressure must be