4. INSPECTION. The state or local gas inspector of the side wall
horizontally vented gas fueled equipment shall not approve the
installation unless, upon inspection, the inspector observes carbon
monoxide detectors and signage installed in accordance with the
provisions of 248 CMR 5.08(2)(a)1 through 4.(b)
EXEMPTIONS: The following equipment is exempt from 248 CMR
5.08(2)(a)1 through 4:
1. The equipment listed in Chapter 10 entitled "Equipment Not Required
To Be Vented" in the most current edition of NFPA 54 as adopted by the
2. Product approved side wall horizontally vented gas fueled equipment
installed in a room or structure separate from the dwelling, building or
structure used in whole or in part for residential purposes.
(c) MANUFACTURERS REQUIREMENTS - GAS EQUIPMENT VENTING
SYSTEM REQUIRED. When the manufacturer of Product Approved side
wall horizontally mounted gas equipment provides a venting system
design or venting system components with the equipment, the
instructions provided by the manufacturer for the installation of the
equipment and the venting shall include:
1. Detailed instructions for the installation of the venting system or the
venting system components: and
2. A complete parts list for the venting system design or venting system.
(d)MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING
SYSTEM NOT PROVIDED. When the manufacturer of a product approved
side wall horizontally vented gas fueled equipment does not provide the
parts for the venting of flue gases, but identifies "special venting
systems," the following requirements shall be satisfied by the
1. The referenced "special venting system" instructions shall be included
with the appliance or equipment installation instructions; and
2. The "special venting systems" shall be product approved by the
Board, and the instructions for that system shall include a parts list and
detailed installation instructions.
(e) A copy of all installation instructions for all products approved side
wall horizontally vented gas fueled equipment, all venting instructions,
all parts lists for venting instructions, and/or all venting design
instructions shall remain with the appliance or equipment at the
completion of the installation.
Fig. 53 "Program" key
10.9.1 Memorizing selected temperature
▶ Press buttons
to select desired temperature.
▶ Hold "Program" button for 3 seconds to save temperature.
When LCD stops blinking, temperature is saved in memory.
Using "Program" function
In order to select memorized temperature
▶ Press "Program" key.
LCD shows pre-memorized temperature, which is now the hot water
10.10 Locked condition
This condition is only valid for appliances with one or more remote
Fig. 54 Locked condition
Whenever LCD shows
, the temperature setting cannot be
adjusted because the appliance is in use by a user which already
selected a different temperature. Appliance will be automatically unlock
5 minutes after closing hot water tap.
Maintenance and service
▶ Always shut off the electrical power supply, shut off
the manual gas valve and shut off the water valves
▶ Inspect and clean the complete water heating system
once a year.
▶ Carry out a maintenance as necessary. Immediately
repair all faults to avoid damage to the system.
Annual maintenance table
Inspect venting system
Inspect combustion chamber
Inspect pressure relief
Inspect water filter
Table 16 Annual maintenance
(To remove front cover, see page 9.)
• Venting system - inspect outdoor vent cap on the top of the appliance
for any blockage or restriction. Observe burner flames during heater
operation. (front cover must be removed). Burner flames should be
steady and blue. Yellow, inconsistent (bouncing) flames may be an
indication of poor ventilation or combustion air supply. Inspect the
combustion air inlet pipe for blockage or debris. Inspect combustion
air and exhaust terminations for blockage or debris.
• Inspect burner observation window (Fig.64, #14) for cracks or
spillage of flue gases. Observe burner flames during heater
operation. Flames should be steady and blue with no signs of
yellowing. Yellow burner flames are an indication of improper
combustion. Refer to Section 5, page 11 of this manual to verify
exhaust system and combustion air supply meets manufacturer's
Maintenance and service | 29
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