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1
Determine unit location
Anytime the temperature of any sensor drops below 34°F, the
control turns on the pump contact.
Location
Locate indoor water heaters in a room having a temperature
safely above freezing [32°F (0°C)].
A mechanical room operating under a negative
CAUTION
draft pressure may experience a down draft in
the flue of a water heater 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.
Outdoor installation
A snow screen should be installed to prevent snow and ice ac-
cumulation around the unit or its venting system.
Shut-down and draining
If for any reason, the unit is to be shut off, the following
precautionary measures must be taken:
1.
Shut off gas supply.
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 400 -750
10
DRAIN PLUG
Installation & Operation Manual
Figure 1-2B_Drain the unit_Models 1000 - 2100
Combustion and ventilation air
Provisions for combustion and ventilation air must be in
accordance with Air for Combustion and Ventilation, of the
latest edition of the National Fuel Gas Code, ANSI Z223.1,
in Canada, the latest edition of CAN/CGA-B149 Installation
Code for Gas Burning Appliances and Equipment, or applicable
provisions of the local building codes.
Provide properly-sized openings to the equipment room to
assure adequate combustion air and proper ventilation when
the unit is installed with conventional venting or sidewall
venting.
Combustion air options
Under no circumstances should the
CAUTION
equipment room ever be under a
negative pressure.
should be taken where exhaust fans,
attic fans, clothes dryers, compressors,
air handling units, etc., may take away
air from the unit.
This unit has four combustion air options.
1. Outside Combustion Air, No Ducts
You can direct outside combustion air to this unit using either
one or two permanent openings (see FIG. 1-3).
One Opening
The opening must have a minimum free area of one square
inch per 3000 Btu input (7 cm
opening within 12" (30 cm) of the top of the enclosure.
DRAIN PLUG G (2X)
DR
Particular care
2
per kW). You must locate this
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