Lochinvar 497 - 2067 Determine unit location continued, Outdoor boiler installation, Location, A

Installation & Service Manual

1 Determine unit location (continued)

			Outdoor boiler installation
	TABLE 1A
COMBUSTIBLE FLOOR KITS			Adequate hydronic system antifreeze must be used. A snow
Model		Kit Number
			screen should be installed to prevent snow and ice accumulation
497		CFK3302	around the unit or its venting system.
647		CFK3303	Shut-down and draining
747		CFK3304	If for any reason, the unit is to be shut off, the following
Freeze protection			precautionary measures must be taken:
			1. Shut off gas supply.

Although these units are CSA International design- certified for outdoor installations, such installations are not recommendedinareaswherethedangeroffreezingexists.Youmust provide proper freeze protection for outdoor installations, units installed in unheated mechanical rooms or where temperatures may drop to the freezing point or lower. If freeze protection is not provided for the system, a low ambient temperature alarm is recommended for the mechanical room. Damage to the unit by freezing is non-warrantable.

Anytime the temperature measured at any of the sensors (except the outside air temperature sensor) drops below 40°F, the control turns on the pump contact and the alarm relay. The pump will shut off when both sensors are above 50°F.

Pump operation

This unit is equipped with a pump delay of 30 seconds. If continuous operation of the pump is desired, the pump must be electrically connected to another circuit. Connection of the pump to this unit will provide intermittent pump delay operation.

Location

Locate indoor boilers and water heaters in a room having a tem- perature safely above freezing [32°F (0°C)].

2.Shut off water supply.

3.Shut off electrical supply

4.Drain the unit completely. Remove one threaded plug or bulbwell from the inlet side of the front header and one from the outlet side of the front header on the heat exchanger. Blow all water out of the heat exchanger (see FIG.'s 1-2A and 1-2B).

5.Drain pump and piping.

Figure 1-2A_Drain the unit_Models 497 - 747

CAUTION	A mechanical room operating under a negative
	draft pressure may experience a down draft
	in the flue of a boiler when it is not firing.
	The cold outside air pulled down the flue
	may freeze a heat exchanger. This condition
	must be corrected to provide adequate freeze
	protection.

Hydronic systems anti-freeze

Freeze protection for a heating boiler or hot water supply boiler using an indirect coil can be provided by using hydronic system antifreeze. Follow the appliance manufacturers instructions. Do not use undiluted or automotive type antifreeze.

DRAIN PLUG

Figure 1-2B_Drain the unit_Models 987 - 2067

DRAIN PLUG (2X)

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