Lenox XC14 Usedo Notweighcharge-Inm Thodunit, Use Weigh-Inmethod, Do Not Charge Unit

65ºF

START: Measure outdoor ambient temperature

and

ABOVE

USEDO NOTWEIGHCHARGE-IN M THODUNIT

Weigh(Results-in orofremovechargingrefrigerantat low	ABOVE or
	BELOW
bas d upon line length
temperatures not reliable)	64ºF and
	BELOW

APPROACH TXV

If refrigerant is added or removed, retest to confirm that unit is properly charged.

1.Connect gauge set as illustrated in figure 18.

2.Confirm proper airflow across coil using figure 20.

3.Compare unit pressures with table 4, Normal Operating Pressures.

4.Set thermostat to call for heat (must have a cooling load between 70-80ºF (21−26ºC).

5.When heat demand is satisfied, set thermostat to call for cooling.

6.Allow temperatures and pressures to stabilize.

7.Record outdoor ambient temperature: AMBº =_________

8.Record liquid line temperature: LIQº = __________

9.Subtract to determine approach (APPº): LIQº_____ − AMBº _____ = APPº_____

10.Compare results with table below.

If value is greater than shown (high approach), add refrigerant; if less than shown (liquid temperature too close to ambient temperature, low approach), remove refrigerant.

APPº (Approach) Values(F:+/−1.0° [C: +/−0.6°])

ºF (ºC)*	−018	−024	−030	−036	−041	−042	−047	−048	−060
65 (18)	4 (2.2)	2 (1.1)	2 (1.1)	2 (1.1)	3 (1.7)	6 (3.3)	9 (5.0)	7 (3.9)	8 (4.4)
75 (24)	5 (2.8)	4 (2.2)	4 (2.2)	5 (2.8)	3 (1.7)	6 (3.3)	9 (5.0)	8 (4.4)	9 (5.0)
85 (29)	6 (3.3)	4 (2.2	6 (3.3)	8 (4.4)	4 (2.2)	8 (4.4)	8 (4.4)	8 (4.4)	9 (5.0)
95 (35)	5 (2,8)	4 (2.2)	5 (2.8)	7 (3.9)	4 (2.2)	8 (4.4)	8 (4.4)	8 (4.4)	9 (5.0)
105 (41)	3 (1.7)	4 (2.2	5 (2.8)	6 (3.3)	4 (2.2)	8 (4.4)	8 (4.4)	8 (4.4)	9 (5.0)
115 (45)	3 (1.7)	3 (1.7)	4 (2.2)	6 (3.3)	5 (2.8)	8 (4.4)	8 (4.4)	9 (5.0)	9 (5.0)

*Temperature of air entering outdoor coil

Figure 22. Using HFC−410A Approach (TXV) Charge Method

											1.	Connect gauge set as illustrated in figure 18.
START: Measure outdoor ambient temperature							65ºF				2.	Confirm proper airflow across coil using figure 20.
							and				3.	Compare unit pressures with table 4, Normal
							ABOVE					Operating Pressures.
											4.	Set thermostat to call for heat (must have a cooling
USE WEIGH-IN METHOD
												load between 70-80ºF (21−26ºC)
	DO NOT CHARGE UNIT					ABOVE or
Weigh-in or remove refrigerant											5.	Measure outdoor ambient temperature
	(Results of charging at low					BELOW
based upon line length											6.	When heat demand is satisfied, set thermostat to call
	temperatures not reliable)		64ºF and									for cooling
			BELOW								7.	Allow temperatures and pressures to stabilize.
SUBCOOLING TXV												NOTE − If necessary, block outdoor coil to maintain
												325 − 375 psig.
BLOCK OUTDOOR COIL: [sometimes necessary with lower											8.	Record liquid line temperature:
temperatures] Use cardboard or plastic sheet to restrict the airflow												LIQº = ______
through the outdoor coil to achieve pressures from 325−375 psig											9.	Measure liquid line pressure and use the value to
(2240−2585 kPa). Higher pressures are needed to check charge. Block
												determine saturation temperature (see table 3):
equal sections of air intake panels and move coverings sideways until
the liquid pressure is in the above noted ranges.												SATº = ______
						CARDBOARD OR					10.	Subtract to determine subcooling (SCº):
												SATº_____ − LIQº _____ = SCº _____
						PLASTIC SHEETS
	If refrigerant is	If value is									11.	Compare results with table below.
	added or removed,
		MORE than
	verify charge using
		shown, remove
	the Approach								SCº (Subcooling) Values (F:+/−1.0° [C: +/−0.6°])
		refrigerant.
	Method.
					ºF (ºC)*	−018	−024		−030	−036		−041	−042	−047	−048	−060
					65 (18)	10 (5.6)	10 (5.6)	11 (6.1)		13 (7.2)		9 (5.0)	10 (5.6)	6 (3.3)	8 (4.4)	8 (4.4)
				75 (24)		6 (3.3)	7 (3.9)	8 (4.4)		9 (5.0)		7 (3.9)	7 (3.9)	6 (3.3)	8 (4.4)	7 (3.9)
	If value is LESS	MORE or			85 (29)	6 (3.3)	8 (4.4)	6 (3.3)		7 (3.9)		7 (3.9)	8 (4.4)	6 (3.3)	8 (4.4)	8 (4.4)
	than shown, add
		LESS			95 (35)	6 (3.3)	9 (5.0)	6 (3.3)		8 (4.4)		7 (3.9)	8 (4.4)	6 (3.3)	8 (4.4)	7 (3.9)
	refrigerant.
					105 (41)	10 (5.6)	9 (5.0)	7 (3.9)		9 (5.0)		7 (3.9)	8 (4.4)	6 (3.3)	8 (4.4)	6 (3.3)
				115 (45)		10 (5.6)	10 (5.6)	8 (4.4)		10 (5.6)		6 (3.3)	7 (3.9)	5 (2.8)	7 (3.9)	6 (3.3)
					*Temperature of air entering outdoor coil

Figure 23. Using HFC−410A Subcooling (TXV) Charge Method

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