Daikin DCG Series Service Instructions Manual page 31

SYSTEM OPERATION
DOOR
PROVIDE CLEARANCE
FOR REMOVAL OF
ACCESS PANELS
MANUAL
SHUTOFF VALVE
GROUND JOINT
UNION
Proper Piping Practice
NOTE: The unit gas supply entrance is factory sealed with
plugs. Keep plugs in place until gas supply is ready to be
installed. Once ready, replace the plugs with the supplied
grommets and install gas supply line.
G P C
AS IPING HECKS
T
O PREVENT PROPERTY DAMAGE OR PERSONAL INJURY DUE TO FIRE
THE FOLLOWING INSTRUCTIONS MUST BE PERFORMED REGARDING GAS
CONNECTIONS AND PRESSURE TESTING
• T
HE UNIT AND ITS GAS CONNECTIONS MUST BE LEAK TESTED
BEFORE PLACING IN OPERATION
,
EXPLOSION OR FIRE NEVER USE A MATCH OR OPEN FLAME TO TEST
. N
FOR LEAKS EVER EXCEED SPECIFIED PRESSURES FOR TESTING
H
IGHER PRESSURE MAY DAMAGE GAS VALVE AND CAUSE
OVERFIRING WHICH MAY RESULT IN PREMATURE HEAT EXCHANGE
.
FAILURE
• T -
HIS UNIT AND ITS SHUT OFF VALVE MUST BE DISCONNECTED FROM
THE GAS SUPPLY DURING ANY PRESSURE TESTING OF THAT SYSTEM
AT TEST PRESSURES IN EXCESS OF
• T
HIS UNIT MUST BE ISOLATED FROM THE GAS SUPPLY SYSTEM BY
CLOSING ITS MANUAL SHUT
TESTING OF THE GAS SUPPLY PIPING SYSTEM AT TEST PRESSURES
1/2 PSIG (3.48
EQUAL TO OR LESS THAN
T
O AVOID PROPERTY DAMAGE OR PERSONAL INJURY
NO OPEN FLAME IN THE VICINITY DURING AIR BLEEDING
There will be air in the gas supply line after testing for leaks
on a new installation. Therefore, the air must be bled from the
line by loosening the ground joint union until pure gas is
expelled. Tighten union and wait for five minutes until all gas
DRIP LEG
CAUTION
:
. B
ECAUSE OF THE DANGER OF
1/2 PSIG (3.48 P ).
K A
-
OFF VALVE DURING ANY PRESSURE
P ).
K A
WARNING
,
BE SURE THERE IS
.
has been dissipated in the air. Be certain there is no open
flame in the vicinity during air bleeding procedure. The unit is
placed in operation by closing the main electrical disconnect
switch for the unit.
PROPANE GAS INSTALLATIONS
T
O AVOID PROPERTY DAMAGE
FIRE OR EXPLOSION CAUSED BY A PROPANE GAS LEAK
DETECTING WARNING DEVICE
ODORANT IN PROPANE GAS
ONLY RELIABLE WAY TO DETECT A PROPANE GAS LEAK
LOCAL PROPANE GAS SUPPLIER ABOUT INSTALLING A GAS DETECTING
.
WARNING DEVICE
IMPORTANT NOTE: Propane gas conversion kits must be
installed to convert units to propane gas.
All propane gas equipment must conform to the safety
standards of the National Board of Fire Underwriters (See
NBFU Manual 58). Line pressure 11.3 - 14" w.c.
For satisfactory operation, propane gas manifold pressure
must be within 9.7 - 10.3 inches w.c. for high fire and within
6.7 - 7.3 inches w.c. low fire at the manifold with all gas
appliances in operation. Maintaining proper gas pressure
depends on three main factors:
,
1. Vaporization rate, which depends on (a) temperature of
the liquid, and (b) wetted surface area of the container or
containers.
2. Proper pressure regulation.
3. Pressure drop in lines between regulators, and between
.
second stage regulator and the appliance. Pipe size
required will depend on length of pipe run and total load
of all appliances.
WARNING
,
PERSONAL INJURY OR DEATH DUE TO
,
INSTALL A GAS
. S
INCE RUST CAN REDUCE THE LEVEL OF
,
A GAS DETECTING WARNING DEVICE IS THE
. C
ONTACT A
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