Lennox International Inc 15CHAX Series installation instructions Cool, Just

COOL

The COOL jumper is used to determine the CFM during cooling operation. This jumper selection is activated for cooling when Y1 is energized.

The blower motor runs at 80 percent of the selected air flow for the first 7−1/2 minutes of each cooling demand. This fea- ture allows for greater humidity removal and saves energy. In the cooling mode, the blower control board delays blower operation for 5 seconds after the compressor starts. The blower continues to operate for 90 seconds after the compressor is de−energized.

HEAT

The HEAT jumper is used to determine CFM during back- up electric heat operation only. These jumper selections are activated only when W is energized.

In the backup heat mode, the blower continues to operate for 2 minutes after the heating demand is satisfied. NOTE − Due to the nature of electric heat, CFM settings are limited.

CONTINUOUS FAN

When the thermostat is set for

and there is no demand for heating or cooling, the blower control will provide 50 percent of the COOL CFM selected.

NOTE − With the proper thermostat and subbase, continu- ous blower operation is possible by closing the R to G cir- cuit. Cooling blower delay is also functional in this mode.

DEHUMIDIFICATION

The blower control board includes an HUM terminal which provides for connection of a humidistat. The JV1 resistor on the blower control board must be cut to activate the HUM terminal. The humidistat must be wired to open on humidity rise. When the dehumidification circuit is used, the variable speed motor will reduce the selected air flow rate by 25 percent when humidity levels are high. An LED (D1) lights when the blower is operating in the dehumidifi- cation mode.

Table 2

15CHAX−24, 15CHAX−30 Blower Performance

0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range

										Jumper Speed Positions
-
JUST"	A		B		C		D		A		B	C		D	A		B		C		D
Jumper
Setting	cfm	L/s	cfm L/s		cfm L/s		cfm L/s		cfm L/s		cfm L/s	cfm L/s	cfm L/s		cfm L/s		cfm L/s		cfm	L/s	cfm	L/s
+	1150 545		920	435	690	325	1035 490		1150 545		1150 545	1150 545	1150 545		575	270	460	215	345	165	520	245
NORM	1000 470		800	380	600	285	900	425	1000 470		1000 470	1000 470	1000 470		500	235	400	190	300	140	450	210
−	850	400	680	320	510	240	765	360	1000 470		1000 470	1000 470	1000 470		425	200	340	160	300	140	385	180

Table 3

15CHAX−36 Blower Performance

0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range

									Jumper Speed Positions
-
JUST"	A	B		C		D		A		B	C		D	A		B		C		D
Jumper
Setting	cfm L/s	cfm L/s		cfm L/s		cfm L/s		cfm L/s		cfm L/s	cfm L/s	cfm L/s		cfm L/s		cfm L/s		cfm	L/s	cfm	L/s
+	1380 650	1150 545		920	435	1265 575		1380 650		1380 650	1150 545	1150 545		690	325	575	270	460	215	635	300
NORM	1200 565	1000 470		800	380	1100 520		1200 565		1200 565	1000 470	1000 470		600	285	500	235	400	190	550	260
−	1020 480	850	400	680	320	935	440	1200 565		1200 565	1000 470	1000 470		510	240	425	200	350	165	470	220

Table 4

15CHAX−42, 15CHAX−48, 15CHAX−60, Blower Performance

0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range

							Jumper Speed Positions
-
JUST"	A		B	C	D	A		B	C		D	A		B		C		D
Jumper
Setting	cfm	L/s	cfm L/s	cfm L/s	cfm L/s	cfm L/s		cfm L/s	cfm L/s	cfm L/s		cfm	L/s	cfm L/s		cfm L/s		cfm L/s
+	2070 975		1840 870	1610 760	1380 650	1610 760		1610 760	1610 760	1610 760		1035 490		920	435	805	380	690	325
NORM	1800 850		1600 755	1400 660	1200 565	1400 660		1400 660	1400 660	1400 660		900	425	800	380	700	330	600	285
−	1530 720		1360 640	1190 560	1020 480	1400 660		1400 660	1400 660	1400 660		765	360	680	320	595	280	510	240

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