Installation; Installation Codes; Equipment Base; Stacking - Rheem Raypa DELTA 399B Installation And Operation Manual

The temperature of the water in the heater can be reg-
ulated by using the temperature controller. To comply
with safety regulations, the temperature controller is
set at the lowest setting when shipped from the factory.
To adjust the water temperature, insert a small straight
screwdriver into the adjustment screw on the front of
temperature controller and turn the wheel to the de-
sired setting (See Fig. 4.).
Fig. 4: Temperature Control
ACAUTION: Hotter water increases the risk of
scalding! There is a hot water scald potential if
the thermostat is set too high.

INSTALLATION

Installation Codes

Installations must follow these codes:
• Local, state, provincial, and national codes, laws,
regulations and ordinances
• National Fuel Gas Code, ANSI Z223.1/NFPA 54 –
latest edition (NFGC)
• National Electrical Code, ANSI/NFPA 70 - latest
edition (NEC)
• Standard for Controls and Safety Devices for Auto-
matically Fired Boilers, ANSI/ASME CSD-1, when
required (CSD-1)
• For Canada only: CAN/CGA B149 Installation
Code (B149) and CSA C22.1 C.E.C. Part 1 (C22.1)

Equipment Base

The heater should be mounted on a level, structurally
sound surface. The heater is approved for installation
on a combustible surface but must NEVER be installed
on carpeting. Gas-fueled equipment installed in en-
closed parking garages must be located at least 18 in.
above the floor.

Stacking

Delta Limited units can be stacked two units high with
an optional stacking rack. A stacking kit is available
from Raypak for this type of installation.
ACAUTION: The heaters should be located in
an area where water leakage will not result in
damage to the area adjacent to the appliances or
to the structure. When such locations cannot be
avoided, it is recommended that a suitable catch
pan, adequately drained, be installed under the
appliance. The pan must not restrict air flow.
REQUIRES OPTIONAL VENT TEE.
REQUIRES OPTIONAL VENT TEE IF VENTED OUT BACK
OF HEATER.
Fig. 5: Typical Stacked Installation
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