Important Notes; Field Charging - EMI S2HA Installation, Operation And Maintenance Manual

S2HA & T2HA REFRIGERANT PIPING INSTALLATION SECTION
S2HA & T2HA REFRIGERANT CHARGE TABLE
Circuit
Capacity Btuh
9000
12000
18000
24000
** Any 18,000 Btuh circuit with more than 57 feet of tubing (> 112 oz of total refrigerant charge) requires a 25W

IMPORTANT NOTES:

1. To find the charge adjustment and system charge for any evaporator and
tubing length:
Line Adjustment = (Line Chg/Ft) x Line Length
System Total = Factory Charge + Line Adjustment
2. Round to the nearest ounce and allow for gauges and hoses.
3. Use R22 refrigerant.
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-
Multi-zone Heat Pump Condensing Units
Evaporator Line
Pairing Chg/ft
WLHA09
0.25 oz
CAHB12
WLHA12
0.25 oz
CAHB12
WLHA24
0.56 oz
CAHB24
WLHA24
0.56 oz
CAHB24
wrap around Crank Case Heater.

FIELD CHARGING

Line Line
Length Adjust
10 ft 3 oz
25 ft 6 oz
50 ft 13 oz
10 ft 3 oz
25 ft 6 oz
50 ft 13 oz
10 ft 6 oz
25 ft 14 oz
50 ft ** 28 oz **
10 ft 6 oz
25 ft 14 oz
50 ft 28 oz
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 S & T series (S2HA, T2HA, T3HA &
T4HA) 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.
13
Factory Total
Charge Charge
45 oz
42 48 oz
55 oz
49 oz
46 52 oz
59 oz
86 oz
80 94 oz
108 oz
86 oz
80 94 oz
108 oz
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