EMI Corp User Manual
Page 11
www.enviromaster.com
11
Multi-zone Heat Pump Condensing Units
CIRCUIT
CAPACITY
EVAPORATOR
PAIRING
LINE
CHG/FT
LINE
LENGTH
LINE
ADJUST
FACTORY
CHARGE
SYSTEM
TOTAL
S2HA
S2HA
9,000 Btuh
WLHA09, CAHB12
WLHA12, CAHB12
.25 OZ.
10
25
50
3 OZ.
6 OZ.
13 OZ.
42
45
48
55
12,000 Btuh
WLHA12
CAHB12
.25 OZ.
10
25
50
3 OZ.
6 OZ.
13 OZ.
46
49
52
59
IMPORTANT NOTES:
1. To find the charge adjustment and system charge for any evaporator and tubing length:
Line Adjustment = (Line Charge/FT) x Line Length
System Total = Factory Charge + Line Adjustment
2. Round to the nearest ounce and allow for gauges and hoses.
REFRIGERANT CHARGE TABLE FOR S2HA
REFRIGERANT PIPING INSTALLATION SECTION
The use of the superheat method is highly
recommended for field charging or checking
the existing refrigerant charge in a system.
Because each installation is different in terms
of indoor air flow, refrigerant line length, etc..,
the factory charge may not be correct for
every application. To assure the best perfor-
mance from the air-conditioner, the refrigerant
charge should be checked and adjusted, if
need be, on each installation.
For proper superheat readings, a standard
low-side refrigerant gauge and an accurate
thermometer are needed. A mercury or
stem-type thermometer is not adequate
for suction-line temperatures. We recom-
mend electric thermocouple thermometers
(available at most refrigeration wholesal-
ers); however an accurate remote-bulb
thermometer can be used. When mea-
suring the line temperature, be sure the
thermometer is well insulated to assure
accurate measurements. The chart below
gives superheat values at various outdoor
temperatures. Allow at least 5 minutes run-
ning time between charge adjustments for
the unit to stabilize.
The S2HA has manifold access points on
each of the service valves for the high and
low pressures in cooling mode. There is an
additional “common suction” access point
above each service valve set to provide
low pressure access in the heating mode
as both service valves are at high side
pressure.
FIELD CHARGING