Daikin DHG - Accessory Installation

36
THE FOLLOWING INSTRUCTIONS ARE MANDATORY FOR A2L
SY
STEMS AND SUPERSEDE OTHER INSTRUCTIONS
WARNING
ONLY BRAZING TECHNIQUES AND APPROVED MECHANICAL JO INTS SHOULD BE USED TO CONNECT
REFRIGERANT TUBING CONNECTIONS. NON-APPROVED MECHANICAL CONNECTORS AND OTH ER
METH ODS ARE NOT PERMITTED IN THIS SYSTEM CONTAINING A2L REFRIGERANT. APPROVED
MECHANICAL JOINTS WILL BE DETAILED IN TH E PRODUCT' S SPECIFICATION SHEETS.
ST
ANDING PRESSURE TEST/ LEAK DETECTI ON METHOD
Us
ing dry nitrogen or dry helium
, pressurize the s
y
stem to 450 PSIG. Al low the pressure to stabilize an
d
ho
ld for 15 Minutes (minimum). The system is considered leak-free if the pressure does not
drop bel
ow
45
0 PSIG. If, after 15 Minutes, the pressure drops below 450 PSIG, it implies a leak in t he s
y
stem. Procee
d
wi
th identif
y
in
g
and sealin
g
the l eak and repeatin
g
the Standin
g
Pressure Test. Leak t est the s
y
stem usin
g
dr
y nitrogen or dry helium and soapy water to identify leaks.
No refrigerant shall be used
fo
r
pr
essure testing to detect leaks.
Proceed to system evacuation using the Deep Vacuum Method.
DE
EP VACUUM METH OD
Th
e Deep Vacuum Method requires a vacuum pump rated for 500 microns or l ess. This method
effectivel
y
an
d efficiently ensures the system is free of non-
condensable air and moisture. Th e Tr iple Evacuatio
n
Me
thod is detailed in the Service Manual for this product model as an alternative.
To expedite th
e
ev
acuation procedure, it is recommended that the Schrader Cores be removed from the service valves
us
ing a core-removal tool.
1. Connect the vacuum pump, micron gauge, and vacuum-
rated hoses to both service valves
.
Evacuation must use both service valves to eliminate system mechanical seals.
2. Evacuate the system t o less than 500 microns.
3. Isolate the pump from the system and hold the
vacuum for 10 minutes (minimum). Typically
,
pressure will rise slowly during this period. If the pressure rises to less than 1000 microns an
d
remains steady, the system is considered leak-free; proceed t o system charging and startup.
4. If pressure rises above 1000 microns but holds steady below 2000 microns, non-
condensable ai
r
or moisture may remain
, or a small leak may be present. Return to step 2: If the same result i
s
achieved, check for leaks and repair. Repeat t he evacuation procedure.
5. If pressure rises above 2000 microns, a leak is present. Check for leaks and repair
them. Th en
,
repeat t he evacuation procedure.
AC
CESSORY INSTALLATION
WARNING
ALL ACCESSORI ES THAT MAY BECOME A POTENTI AL IGNITION SOURCE IF INSTALLED, SUCH AS
ELECTRONIC AIR CLEANERS, MUST ONLY BE POWERED TH ROUGH OUR ACCESSORY CONTROL
BOARD KIT. IF AN ELECTRONIC AIR CLEANER IS ALREADY INSTALLED IN THE DUCT WORK AND NOT
CONNECTED TO THE ACCESSORY CONTROL BOARD, IT WILL HAVE TO BE DISABLED OR REMOVED.
ENSURE THAT ANY ADDITIONAL WIRING FROM THE INDOOR UNIT TO TH E ACCESSORY CONTROL
BOARD IS ROUTED AND PROTECTED FROM DAMAGE AND WEAR, AVOIDING THE FLUE PIPE AND ANY
JOINTS THAT MAY NEED BRAZED OR DISCONNECTED FOR SERVICE.
REFER TO THE PRODUCT SPECIFICATI ON SHEET FOR THE ACCESSORY CONTROL BOARD KIT PART
NUMBER