Trane CSAA Gas Heat for Performance Climate Changer Air Handlers

Quick Reference Guide

Introduction

The gas heat section is an integral part of the air-handling system and consists of either an inshot tube or a drum-and-tube gas heat exchanger, a burner, gas train components, and a control panel for electrical connections. An access door is provided for service and maintenance. The gas heat section must be installed in a blow-thru position downstream from the supply fan. Downstream sections require separation by a blank access section, and discharge temperatures must be controlled to prevent exceeding component temperature limits. For drum and tube heaters with direct drive plenum supply fans, a small diffuser section is necessary between the fan and the gas heat section.

Copyright: This document is the property of Trane. Reproduction or use in whole or in part requires written permission. Trane reserves the right to revise this publication and its content at any time without prior notification.

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Revision History: Updated Gas Heat - Inshot MBh output table.

General Information

Gas Heat - Inshot

Table 1. MBh output - gas heat - inshot

MBh Input	MBh Output	Unit Size
MBh Input	MBh Output	4	6	8	10	12	14	17	21	25	30
Nominal cfm		2000	3000	4000	5000	6000	7000	8500	10500	12500	15000
Minimum cfm		1500	2250	3000	3750	4500	5250	6375	7875	9375	11250
120	95	Min MBh Output	19	19
		Nom Temp Rise	43	29
		Max Temp Rise	58	38
250	205	Min MBh Output	21	21	21	21
		Nom Temp Rise	93	62	47	37
		Max Temp Rise	101	83	62	50
400	325	Min MBh Output			33	33	33
		Nom Temp Rise			98	74	59
		Max Temp Rise			101	98	79
500	405	Min MBh Output					41	41
		Nom Temp Rise					92	74	50
		Max Temp Rise					101	98
300	240	Min MBh Output						12	10
		Nom Temp Rise					24	24	24
		Max Temp Rise					36	31	26
400	325	Min MBh Output						5	4	3
		Nom Temp Rise					33	33	33
		Max Temp Rise					48	42	34
600	485	Min MBh Output						7	6	5
		Nom Temp Rise					49	49	49
		Max Temp Rise					66	56	46
775	625	Min MBh Output						10	8	7
		Nom Temp Rise					73	63	52
		Max Temp Rise					98	84	69
1200	970	Min MBh Output								31	31	31
		Nom Temp Rise							54	45	38
		Max Temp Rise							72	61	51

Gas Heat Application Rules - Inshot

The maximum allowable temperature rise is as listed in the table for minimum cfm.
Nominal airflow is based on 500 fpm through a nominal coil (e.g., 500 x unit size 8 = 4000 cfm).
The minimum allowable airflow at full fire is 75 percent of the nominal airflow (e.g., 0.75 x 500 x unit size 8 = 3000 cfm).
The minimum allowable airflow at reduced fire is 50 percent of the nominal airflow (e.g., 0.50 x 500 x unit size 8 = 2000 cfm).
Calculate temperature rise at airflows other than nominal using the equation: Temp Rise = (1000 x MBh) / (1.1 x CFM).
For high altitude applications, derate the heating capacity (MBh) by 4 percent for every 1,000 feet of altitude over 2,000 feet above sea level.
Temperature rise is listed for nominal cfm/minimum cfm.

Motor and Electrical Specifications - Inshot

Table 2. Motor and electrical specifications

Specifications	Gas Heater Input Power	Inducer Motor(a)	Control Power(a)
Volts	115	115
Hertz	60	60	60
Phase	1	1	1
HP	n/a	n/a
FLA/Amps	n/a	6

(a) Powered by a "line to 115 volt" transformer for all gas heaters except 115/60/1 rated units.

Gas Heat - Drum and Tube

Table 3. MBh output - gas heat - drum and tube, sections size 6 to 30

MBh Output	Unit Size
MBh Output	6	8	10	12	14	17	21	25	30
Nominal cfm		3000	4000	5000	6000	7000	8500	10500	12500	15000
Minimum cfm		2250	3000	3750	4500	5250	6375	7875	9375	11250
200	Min MBh Output	30	30	30	30	30	30	30	30
	Nom Temp Rise	61	45	36	30	26	21	17	15
	Max Temp Rise	81	61	48	40	35	29	23	19
300	Min MBh Output	30	30
	Nom Temp Rise	91	68
	Max Temp Rise	101	91
320	Min MBh Output	30	30	30	30	30	30	30
	Nom Temp Rise	58	48	42	34	28	23	19
	Max Temp Rise	78	65	55	46	37	31	26
360	Min MBh Output
	Nom Temp Rise	56	56	56	56	56	56	56
	Max Temp Rise	65	55	47	39	31	26	22
560	Min MBh Output
	Nom Temp Rise	56	56	56	56	56	56	56
	Max Temp Rise	60	48	41	34
700	Min MBh Output
	Nom Temp Rise	80	80	80	80	80	80	80
	Max Temp Rise	75	61	51	42
860	Min MBh Output
	Nom Temp Rise	80	80	80	80	80	80	80
	Max Temp Rise	100	81	68	57
1000	Min MBh Output
	Nom Temp Rise								150	150	150
	Max Temp Rise								87	73	61
1200	Min MBh Output
	Nom Temp Rise								101	97	81
	Max Temp Rise								17	15	12

Table 4. MBh output - gas heat - drum and tube, sections size 35 to 120

MBh Output	Unit Size
MBh Output	35	40	50	57	66	80	100	120
Nominal cfm		17500	20000	25000	28500	33000	40000	50000	60000
Minimum cfm		13125	15000	18750	21375	24750	30000	37500	45000
320	Min MBh Output	30
	Nom Temp Rise	17
	Max Temp Rise	22
360	Min MBh Output
	Nom Temp Rise	19
	Max Temp Rise	25
560	Min MBh Output	56	56	56	56	56	56	56	56
	Nom Temp Rise	29	25	20	18
	Max Temp Rise	39	34	27	24
700	Min MBh Output	80	80	80	80	80	80	80	80
	Nom Temp Rise	36	32	25	22	19
	Max Temp Rise	48	42	34	30	26
860	Min MBh Output	80	80	80	80	80	80	80	80
	Nom Temp Rise	45	39	31	27	24	20
	Max Temp Rise	60	52	42	37	32	26
1000	Min MBh Output	150	150	150	150	150	150	150	150
	Nom Temp Rise	52	45	36	32	28	23	18	15
	Max Temp Rise	69	61	48	43	37	30	24	20
1250	Min MBh Output	150	150	150	150	150	150	150	150
	Nom Temp Rise	65	57	45	40	34	28	23	19
	Max Temp Rise	87	76	61	53	46	38	30	25
1500	Min MBh Output	150	150	150	150	150	150	150	150
	Nom Temp Rise	78	68	55	48	41	34	27	23
	Max Temp Rise	101	91	73	64	55	45	36	30
1750	Min MBh Output	200	200	200	200	200	200	200	200
	Nom Temp Rise	91	80	64	56	48	40	32	27
	Max Temp Rise	101	101	85	74	64	53	42	35
2000	Min MBh Output
	Nom Temp Rise	73	64	55	45	36	30
	Max Temp Rise	97	85	73	61	48	40
2400	Min MBh Output
	Nom Temp Rise					66	55	44	36
	Max Temp Rise					88	73	58	48

Gas Heat Application Rules - Drum and Tube

The maximum allowable temperature rise is as listed in the table for minimum cfm.
Nominal airflow is based on 500 fpm through a nominal coil (e.g., 500 x unit size 8 = 4000 cfm).
The minimum allowable airflow at full fire is 75 percent of the nominal airflow (e.g., 0.75 x 500 x unit size 8 = 3000 cfm).
The minimum allowable airflow at reduced fire is 50 percent of the nominal airflow (e.g., 0.50 x 500 x unit size 8 = 2000 cfm).
Calculate temperature rise at airflows other than nominal using the equation: Temp Rise = (1000 x MBh) / (1.1 x CFM).
For high altitude applications, derate the heating capacity (MBh) by 4 percent for every 1,000 feet of altitude over 2,000 feet above sea level.
Temperature rise is listed for nominal cfm/minimum cfm.
A 20:1 turndown ratio option is available on unit sizes 35 through 120 with 1250 MBH burner capacity and greater.
The 2,500 MBH burner option is only available with 20:1 turndown ratio capacity control.

Gas Heat Vestibule

All inshot tube design heat exchangers have an internal vestibule. For drum and tube exchangers, the vestibule may be internal or external. An external vestibule may be used to house the burner and gas train components, extending the width of the gas heat section (see Figure 1). The external vestibule, if required, ships attached to the gas heat section. Some heaters have gas train components in an internal vestibule (see Figure 2). Refer to Figure 5, p. 10 for vestibule locations.

Figure 1. Gas heat section with external vestibule

Figure 2. Gas heat section with internal vestibule

Dimensions and Weights

Service Clearance Recommendations

A minimum clearance of the section width plus 12 inches on the access door side of the gas heat section is recommended for routine maintenance. This clearance provides sufficient room to replace the heat exchanger if it fails. The section side panels must be removed to access the heat exchanger.

Figure 1. Service clearance for indoor units

Table 1. Service clearance dimensions (inches)

Component	Unit Size	4	6	8	10	12	14	17	21	25	30	35	40	50	57	66	80	100	120
F (gas heat external vestibule)	n/a	89	90	108	100	100	105	115	115	118	136	140	156	156	170	179	180	n/a
F (gas heat internal vestibule)	56	56	63	74	79	84	84	92	92	106	112	125	138	138	153	153	167	194

Notes: The clearance dimensions above are recommended on one side of the unit for regular service and maintenance. Refer to as-built submittals for item locations (filter access doors, coil, piping connections, motor locations, hoods, pipe cabinets, etc.). Ensure sufficient clearance on all sides for access panels, plug panels, or section-to-section attachment brackets. Clearance for starters, VFDs, or other high-voltage devices must comply with NEC requirements. For specific dimensional and weight information, refer to unit submittals. Dimensions and weights in this manual are approximate. Trane has a policy of continuous product improvement and reserves the right to change designs and specifications without notice.

Dimensions and Weight Tables

Table 2. Gas heat dimensions (inches) and weights (pounds) - Inshot

Unit Size	Output Capacity MBh	Length	Weight
004	95	41.136	432
004	205	56.636	625
006	95	41.136	441
006	205	56.636	636
008	325	74.136	856
	205	56.636	691
	325	74.136	919
010	405	84.136	1027
010	325	74.136	970
012	240	44.386	639
012	325	57.386	854
014	485	67.136	997
014	240	44.386	657
017	325	57.386	875
017	485	67.136	1021
021	240	44.386	686
021	325	57.386	910
025	485	67.136	1060
025	650	66.006	1348
030	970	81.006	1646
030	650	66.006	1391
	970	81.006	1695
	650	66.006	1453
	970	81.006	1767

Table 3. Gas heat dimensions (inches) and weights (pounds) - drum and tube

Unit Size	Output Capacity MBh	Length	Weight
6	200	57.00	753
6	300	73.00	901
8	200	57.00	798
8	300	73.00	954
10	200	59.00	953
10	320/360	77.00	1093
12	200	57.00	913
12	320/360	73.00	1132
14	200	57.00	937
14	320/360	68.00	1128
17	200	60.00	1011
17	320/360	71.00	1211
21	560	71.00	1192
21	700	83.00	1480
25	200	60.00	1075
	320/360	69.00	1265
	560	69.00	1247
	700	75.00	1503
30	860	81.00	1606
	1000	87.00	1364
	360/360	69.00	1348
	560	65.00	1307
35	700	75.00	1599
	860	81.00	1711
	1000	90.00	1497
	360/360	66.00	1299
40	560	66.00	1442
	700	76.00	1746
	860	76.00	1805
	1000	85.00	1560
50	320/360	66.00	1402
	560	66.00	1595
	700	73.00	1895
	860	80.00	2046
57	1000	80.00	1724
	1250-1750	101.00	2541
	560	64.00	1854
	700	74.00	2191
66	860	74.00	2281
	1000	77.00	2325.57
	1250-1750	106.00	3267
	2000	114.00	3759
80	560	64.00	1901
	700	74.00	2242
	860	74.00	2332
	1000	77.00	2083
100	1250-1750	106.00	2943
	2000	114.00	3430
	700	74.00	2491
	860	74.00	2581
120	1000	74.00	2301
	1250-1750	109.00	3309
	2000	112.00	3688
	2400	118.00	3890

Table 3. Gas heat dimensions (inches) and weights (pounds) - drum and tube (continued)

Unit Size	Output Capacity MBh	Length	Weight
50	560	64.00	1854
	700	74.00	2191
	860	74.00	2281
	1000	77.00	2325.57
57	1250-1750	106.00	3267
	2000	114.00	3759
	560	64.00	1901
	700	74.00	2242
66	860	74.00	2332
	1000	77.00	2083
	1250-1750	106.00	2943
	2000	114.00	3430
80	700	74.00	2491
	860	74.00	2581
	1000	74.00	2301
	1250-1750	109.00	3309
100	2000	112.00	3688
	2400	118.00	3890
	860	74.00	2199
	1000	74.00	1919
120	1250-1750	109.00	2950
	2000	112.00	3320
	2400	112.00	3455
	1000	84.00	3156
1250-1750	92.00	3879
2000	109.00	4504
2400	121.00	4716
1000	92.00	3125
1250-1750	102.00	3887
2000	109.00	4391
2400	119.00	4669

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