Lochinvar CW 745, CW 645 manual Electrical Requirements, Relief Valve

Lochinvar

NOTE: Incorrect piping of the cold water supply to the system will result

in condensate formation on the heat exchanger and operational problems. Higher water temperatures reduce condensate formation. Refer to drawings in Appendix A.

NOTE: When the unit is installed in Canada, it must conform to the CAE C22.1, Canadian Electrical Code, Part 1, and/or local Electrical Codes.

Relief Valve

This water heater is supplied with temperature and pressure relief valve(s) sized in accordance with ASME Boiler and Pressure Vessel Code, Section IV “Heating Boilers.”

(TABLE H) – COMMON WATER MANIFOLD

SIZE FOR MULTIPLE WATER HEATER

INSTALLATION

Pipe sizing chart provides minimum pipe size for common manifold piping to ensure adequate flow.

NUMBER OF	COMMON MANIFOLD SIZE
UNITS	(Min.)
CW 495 thru 745
1	2”
2	3”
3	31/2”
4	4”
5	5”
6	5”
CW 986 thru 2066
1	21/2”
2	4”
3	4”
4	5”
5	6”
6	6”

ELECTRICAL REQUIREMENTS

(North America)

The appliance is wired for 120 volts.

1.All wiring between the unit and field installed devices shall be made of type T wire [63°F (35°C) rise].

2.The pump must be wired to run continuously when unit is firing.

3.It is recommended that the water heater and pump be wired on separate circuits with properly sized breakers.

(TABLE I) – AMP DRAW DATA

MODEL	FAN(S)	CONTROLS	PUMP	TOTAL AMPS
NUMBER				w/PUMP
CW 495-745	3.4	4.6	5.8	13.8
CW 986-1256	3.4	4.6	7.4	15.4
CW 1436-2066	3.8	4.6	7.4	15.8

14 L o c h i n v a r D E S I G N E R ’ S G U I D E C O P P E R - F I N W A T E R H E A T E R 6 1 5 - 8 8 9 - 8 9 0 0