Roberts Gorden UHD[X][S][R] 200 DUCT HEATER INSTALLATION 5.1 General, Minimum Inlet Duct Length

SECTION 5: DUCT HEATER INSTALLATION

SECTION 5: DUCT HEATER INSTALLATION 5.1 General

To connect the inlet and outlet ducts to the heater, Duct-Mate or similar flanges may be slid over the duct connector flanges supplied on the unit and secured with screws. The connection to the duct then can be made using the Duct-Mate clips. The ducts must have removable access panels upstream and downstream of the heater. These panels must be of appropriate size and placement so that smoke or reflected light could be observed to indicate the presence of leaks in the heat exchanger. Covers for these openings should be sealed to prevent leakage.

Any transition into the inlet of the heater should be smooth, with a taper of no more than 15°. If elbows are required, they should be of either broad radius or fitted with properly designed air turns. Consult a professional to ensure air turns are properly designed.

The heater must be installed on the positive pressure side of the circulating air blower. Air flow through the heater must be as shown on Page 7, Figure 2 and may not be reversed. The air flow must be adjusted such that it is within the acceptable

5.1.1 Minimum Inlet Duct Length

range shown on Page 7, Section 5.1.2. The minimum inlet duct lengths shown on Page 7, Section 5.1.1 must be observed. Pressure drop through the heat exchanger at various air flows is shown on Page 7, Section 5.1.2.

Figure 2: Air Flow Direction

Model	Duct Length	Duct Size (W X H)
UHD[X][S][R] 150-175	52" (132 cm)	28" x 24" (71 cm x 60 cm)
UHD[X][S][R] 200-250	60" (162 cm)	28" x 32 1/4" (71 cm x 103 cm)
UHD[X][S][R] 300-400	75" (190 cm)	28" x 40 1/2" (71 cm x 82 cm)

5.1.2 Temperature Rise and Pressure Drop Ranges

	UHD[X][S][R] 150				UHD[X][S][R] 175				UHD[X][S][R] 200			UHD[X][S][R] 225
Airflow		Temperature	Pressure	Airflow		Temperature	Pressure	Airflow	Temperature	Pressure	Airflow	Temperature	Pressure
(CFM)		Rise (°F)	Drop	(CFM)		Rise (°F)	Drop	(CFM)	Rise (°F)	Drop	(CFM)	Rise (°F)	Drop
			(in wc)				(in wc)			(in wc)			(in wc)
1,360		83	0.02	1,400		95	0.03	2,050	73	0.025	2,100	80	0.035
1,950		58	0.035	2,180		62	0.06	2,600	58	0.035	2,800	61	0.052
2,800		41	0.057	3,244		42	0.10	3,600	42	0.056	4,600	37	0.110
3,700		31	0.083	4,370		31	0.15	5,500	28	0.100	6,230	27	0.167
4,700		24	0.12	5,160		27	0.19	6,570	23.5	0.129	7,400	23	0.214
5,800		20	0.16	6,850		20	0.29	7,750	20	0.163	8,300	20	0.253
	UHD[X][S][R] 250				UHD[X][S][R] 300				UHD[X][S][R] 350			UHD[X][S][R] 400
Airflow		Temperature	Pressure	Airflow		Temperature	Pressure	Airflow	Temperature	Pressure	Airflow	Temperature	Pressure
(CFM)		Rise (°F)	Drop	(CFM)		Rise (°F)	Drop	(CFM)	Rise (°F)	Drop	(CFM)	Rise (°F)	Drop
			(in wc)				(in wc)			(in wc)			(in wc)
2,350		80	0.05	2,700		23	0.02	3,120	86	0.03	3,420	86	0.04
3,000		63	0.07	4,735		50	0.06	4,880	56	0.07	5,200	57	0.08
4,400		43	0.13	6,813		35	0.12	6,612	41	0.123	6,700	45	0.13
5,900		32	0.19	8,000		30	0.17	9,140	30	0.23	8,850	34	0.21
7,625		25	0.28	9,300		26	0.22	10,500	26	0.30	11,600	26	0.36
8,850		22	0.35	10,200		86	0.27	13,600	22	0.48	14,200	22	0.53

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