Lochinvar 000 - 2, 495, 065 service manual Installation with a Chilled Water System, Table - L

Hydronic Heating Boilers and Domestic Water Heaters

INSTALLATION

Continued

Sludge formed as the result of excessive oxygen in the system can restrict water flow resulting in a premature boiler failure. Any boiler damage due to excessive oxygenation is non- warrantable.

Installation with a Chilled Water System

Pipe refrigeration systems in parallel. Install duct coil downstream at cooling coil. Where the hot water heating boiler is connected to a heating coil located in the air handling units which may be exposed to refrigeration air circulation, the boiler piping system must be equipped with flow control valves or other automatic means to prevent gravity circulation of the boiler water during the cooling cycle. The coil must be vented at the high point and hot water from the boiler must enter the coil at this point. Due to the fast heating capacity of the boiler, it is not necessary to provide a ductstat to delay circulator operation. Also, omit thermostat flow checks as the boiler is cold when heating thermostat is satisfied. This provides greater economy over maintaining standby heat (see Figure 29).

EXPANSION

TANK

HEATING AND

COOLING COIL

LOW WATER	PUMP
FLOW SWITCH

Figure 28 - Boiler with Low Temperature Bypass Piping

OUT IN

BOILER

GAS

SUPPLY

WATER SUPPLY

CHILLER

Figure 29 - Installation with a Chilled Water System

TABLE - L

System Temperature Rise Chart Based on Btu/hr Input

		System Temperature Risased on Btu/hr Input									￿T		￿T
		￿T		￿T			￿T		￿T
		10ºF		20ºF			30ºF		40ºF	50ºF			60ºF
Input	Output	GPM FT. HD GPM FT.HD				GPM FT.HD		GPM FT.HD		GPM FT.HD		GPM FT.HD
495,000	400,950	80+	*	40	4.0	27	1.6	20	0.7	16	0.6	13	0.6
645,000	522,450	129+	*	52	5.1	35	3.0	26	1.6	21	0.8	17	0.6
745,000	603,450	149+	*	60	*	40	4.0	30	2.3	24	1.2	20	0.7
985,000	831,600	197+	*	80	5.2	53	2.4	40	1.4	32	1.0	27	0.8
1,255,000	1,058,400	251+	*	102+	*	68	4.3	51	2.5	41	1.6	34	1.1
1,435,000	1,209,000	288+	*	116+	*	78	6.0	58	3.7	47	2.2	39	1.7
1,795,000	1,512,000	360+	*	146+	*	97+	*	73	6.2	58	4.2	49	2.4
2,065,000	1,738,800	414+	*	168+	*	112+	*	84	8.7	67	6.0	56	4.5

+These flow rates exceed recommended flow rates of boiler. If these system temperature rises are used, an external piping by-pass must be installed. * These foot head calculations exceed the maximum allowable flow rate of the boiler. Requires Cupro-Nickel heat exchanger.

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