Lennox International Inc Gas Packaged Units, 15GCSX installation instructions Cool

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 feature allows for greater humidity removal and saves energy.

In the cooling mode, the blower control 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 gas heat operation only. These jumper selections are activated only when W1 is energized.

In the heating mode, the blower control delays blower operation for 30 seconds after the flame is established. The

blower continues to operate for 90 seconds after the gas valve is de−energized.

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, continuous blower operation is possible by closing the R to G circuit. Cooling blower delay is also functional in this mode.

DEHUMIDIFICATION

The blower control includes an HUM terminal which provides for connection of a humidistat. The JV1 resistor on the blower control 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 dehumidification mode.

Table 4

15GCSXAV−24, 15GCSXAV−30 Blower Performance

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

										Jumper Speed Positions
ADJUST			Speed								T" Speed								FAN" Speed
	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		1265	595	1150	545	1035 490		920	435	575		270	460	215	345	165	520	245
NORM	1000	470	800	380	600	285	900	425	1100	520	1000 470		900	425	800	380	500		235	400	190	300	140	450	210
−	850	400	680	320	510	240	765	360	935	440	850	400	765	360	680	320	425	200		340 160		300	140	385	180

Table 5

15GCSXAV−36 Blower Performance

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

										Jumper Speed Positions
ADJUST			Speed								T" Speed								FAN" Speed
	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		1555	735	1265 595		1150	545	1035 490		690		325	575	270	460	215	635	300
NORM	1200	565	1000 470		800	380	1100	520	1350	635	1100 520		1000 470		900	425	600		285	500	235	400	190	550	260
−	1020 480		850	400	680	320	935	440	1150 540		935	440	850	400	765	360	510	240		425 200		350	165	470	220

Table 6

15GCSXAV−42, 15GCSX(A,B)V−48, 15GCSX(A,B)V−60, Blower Performance

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

								Jumper Speed Positions
			Speed						T" Speed						FAN" Speed
Jumper	A		B	C		D	A		B	C		D		A		B		C		D
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	2015	950	1900 895	1555 735		1325 625		1035	490	920	435	805	380	690	325
NORM	1800	850	1600 755	1400 660		1200 565	1750	825	1650 780	1350 635		1150 545		900	425	800	380	700	330	600	285
−	1530	720	1360 640	1190	560	1020 480	1490	700	1405 660	1150	540	980	460	765	360	680	320	595	280	510	240

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