Lenox 50677201, Elite Series XP14 Units HEAT PUMPS Low Pressure Switch S87

System Operation

IMPORTANT

Some scroll compressor have internal vacuum protector that will unload scrolls when suction pressure goes below 20 psig. A hissing sound will be heard when the compressor is running unloaded. Protector will reset when low pressure in system is raised above 40 psig. DO NOT REPLACE COMPRESSOR.

High Pressure Switch (S4)

This unit is equipped with a auto-reset high pressure switch (single−pole, single−throw) which is located on the liquid line. The switch shuts off the compressor when discharge pressure rises above the factory setting. High Pressure (auto reset) − trip at 590 psig, reset at 418 psig.

Table 5. Indoor Unit Matches, Targeted Subcooling, and Add Charge Values

OD Size

−018

−024

−030

Indoor Model #	Subcool		Additional		OD	Indoor Model #	Subcool		Additional		OD	Indoor Model #	Subcool		Additional
	Heat	Cool	Charge		Size		Heat	Cool	Charge		Size		Heat	Cool	Charge
CBX27UH−018	13	14	1	9		CH33−43C	4	9	1	12		CH33−60D	12	8	0	9
CBX27UH−024	13	14	1	9		CR33−30, −36	22	5	1	0		CH33−62D	19	7	1	7
CBX32MV−018/024	12	14	0	0		CX34−31	17	15	2	10		CR33−50, −60	29	5	0	4
CH33−25A	14	14	0	7	−030	CX34−36	25	6	0	10		CR33−60D	29	5	0	4
CH33−25B	14	13	0	5		CX34−38	14	17	2	10	−042	CX34−49	11	6	1	4
CR33−30/36	12	5	0	7		CX34−42	25	6	0	10		CX34−50, −60	25	8	1	15
CX34−25	15	15	1	1		CX34−43	13	17	2	14		CX34−60	8	8	1	4
CX34−31	14	24	1	12		CX34−44, −48	9	21	2	12		CX34−62C	8	11	3	10
CBX26UH−024	17	3	0	15		CBX26UH−036	31	3	0	4		CX34−62D	11	7	1	15
CBX27UH−024	12	12	1	2		CBX27UH−036	18	3	0	5		CBX26UH−048	20	10	3	11
CBX32M−018, −024	14	11	0	4		CBX27UH−042	11	4	0	1		CBX27UH−048	16	6	0	0
CBX32M−030	12	12	1	2		CBX27UH−048	11	4	0	1		CBX27UH−060	12	6	1	4
CBX32MV−018/024	14	11	0	4		CBX32M−036	18	3	0	5		CBX32M−048	16	6	0	0
CBX32MV−024/030	12	12	1	2		CBX32M−042	18	3	0	5		CBX32M−060	20	8	1	0
CBX32MV−036	11	11	2	1		CBX32MV−036	18	3	0	5		CBX32MV−048	16	6	0	0
CBX40UHV−024	11	11	2	1		CBX32MV−048	11	4	0	1		CBX32MV−060	20	8	1	0
CBX40UHV−030	11	11	2	1		CBX40UHV−042	11	4	0	1		CBX32MV−068	10	8	4	5
CH23−41	10	3	0	0		CBX40UHV−048	11	4	0	1		CBX40UHV−048	16	6	0	0
CH33−25A	20	10	1	1		CBX40UHV−036	18	3	0	5	−048	CBX40UHV−060	20	8	1	0
CH33−25B	19	8	1	2		CH33−43B	14	8	2	1		CH23−68	24	6	2	8
					−036
CH33−31A	15	11	1	15		CH33−43C	26	9	2	10		CH33−50, −60C	17	6	1	5
CH33−36C	10	12	0	0		CH33−44/48B	24	8	2	3		CH33−60D	18	6	0	13
CH33−36A	20	10	1	1		CH33−48C	26	9	2	10		CH33−62D	13	7	3	6
CR33−30, −036	17	4	0	14		CH33−49C	15	8	2	12		CR33−50/60	19	6	1	1
CX34−25	15	9	0	15		CH33−50/60C	15	8	2	12		CR33−60	19	6	1	1
CX34−31	15	16	0	9		CR33−48	38	5	0	0		CX34−49C	10	6	1	9
CX34−36	26	6	0	9		CR33−50, −60	15	5	1	4		CX34−60	28	7	3	14
CX34−38	13	11	1	7		CX34−38	40	4	0	15		CX34−62C	10	6	3	12
CBX26UH−030	19	11	1	5		CX34−43	23	8	2	8		CX34−62D	14	7	3	12
CBX27UH−030	10	2	2	15		CX34−44/48	40	4	0	15		CBX26UH−060	31	6	3	0
CBX27UH−036	10	2	2	15		CX34−49	11	7	3	9		CBX27UH−060	13	7	0	8
CBX32M−030	15	4	2	7		CX34−50/60	23	8	2	8		CBX32M−060	17	5	1	4
CBX32M−036	10	2	2	15		CBX26UH−042	42	5	0	8		CBX32MV−048	20	6	0	0
CBX32MV−024, −030	15	4	2	7		CBX27UH−042	13	5	2	2		CBX32MV−060	17	5	1	4
CBX32MV−036	10	2	2	15		CBX32M−048	13	5	2	2		CBX32MV−068	11	8	2	12
CBX40UHV−030	10	2	2	15		CBX32MV−048	13	5	2	2		CBX40UHV−048	20	6	0	0
CBX40UHV−036	10	2	2	15		CBX40UHV−042	13	5	2	2	−060	CBX40UHV−060	17	5	1	4
CH23−41	11	4	0	8		CBX40UHV−048	13	5	2	2		CH23−68	27	7	0	13
CH23−51	11	6	0	14	−042	CH23−68	20	9	1	5		CH33−50, −60C	11	4	0	0
CH33−31A	16	18	2	8		CH33−43B	7	9	3	2		CH33−62D	19	6	2	4
CH33−31B	16	18	2	6		CH33−43C	22	5	1	0		CR33−50/60	19	6	2	4
CH33−36A	10	6	0	6		CH33−44/48B	18	4	0	0		CR33−60	23	6	1	3
CH33−36B	6	3	0	0		CH33−48C	22	5	1	0		CX34−62C	10	7	2	14
CH33−36C	10	11	1	5		CH33−49C	16	6	1	6		CX34−62D	19	7	3	2
CH33−42B	16	18	2	6		CH33−50, −60C	10	9	3	4

*Amount of charge required in additional to charge shown on unit nameplate.

Low Pressure Switch (S87)

This unit is equipped an auto−reset low pressure switch which is located on the vapor line. The switch shuts off the compressor when the vapor pressure falls below the factory setting. Low Pressure (auto reset) − trip at 25 psig, reset at 40 psig.

Low Pressure Switch Bypass (S41) (Optional)

For use in applications where the heat pump is operated in outdoor ambient temperatures below 15°F.

S Prevents nuisance trips form the low pressure switch S Wired in parallel with the low pressure switch

Thermal Protection Switch (S173)

Mounted

Some units are equipped with a compressor mounted normally closed temperature switch that prevents compressor damage due to overheating caused by internal friction. The switch is located on top of the compressor casing (see figure 1). This switch senses the compressor casing temperature and opens at 239−257°F (115°C−125°C) to shut off compressor operation. The

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