EMI T3HB Multi-ZoneHeat Pump Refrigerant Charge Table, Circuit, Evaporator, Line, Factory, Total

Multi-Zone Heat Pump Refrigerant Piping Installation

Multi-Zone Heat Pump Refrigerant Charge Table

Circuit	Evaporator	Line	Line	Line	Factory	Total
Capacity Btuh	Pairing	Chg/ft	Length	Adjust	Charge	Charge
	WLH09		10 ft	3 oz		45 oz
9000	CAH12	0.25 oz	25 ft	6 oz	42	48 oz
	UNH09		50 ft	13 oz		55 oz
	WLH12		10 ft	3 oz		49 oz
12000	CAH12	0.25 oz	25 ft	6 oz	46	52 oz
	UNH12		50 ft	13 oz		59 oz
	WLH24		10 ft	6 oz		86 oz
18000	CAH24	0.56 oz	25 ft	14 oz	63	94 oz
	UNH24		50 ft **	28 oz **		108 oz
	WLH24		10 ft	6 oz		86 oz
24000	CAH24	0.56 oz	25 ft	14 oz	80	94 oz
	UNH24		50 ft	28 oz		108 oz

**Any 18,000 Btuh circuit with more than 87 feet of tubing (> 112 oz of total refrigerant charge) requires a 25W wrap around Crankcase Heater.

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.

Field Charging

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 fow, 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 S & T series (S2HB, T2HB, T3HB & T4HB) have 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.

Multi-zone Heat Pump Condensing Units 13 www.enviromaster.com