Thermo Products COMBOMAX Models from 8 kW to 24 kW : 240 Volts ( single phase ) - Manual (Page 5)

COMBOMAX MC Electric boiler Set-up, use and care guide (revised January 2006) , Page 5.
Section 3 : INSTALLATION
The manufacturer’s warranty does not cover
any damage or defect caused by installation
or attachment or use of any special
attachment other than those authorized by
the manufacturer into, onto, or in
conjunction with the water heater. The use of
such unauthorized devices may shorten the
life of the water heater and may endanger life
and property. The manufacturer disclaims
any responsibility for such loss or injury
resulting from the use of such unauthorized
devices.
3.1 SAFETY MEASURES
All domestic and commercial installations will
include a pressure relief valve limiting the
operating pressure to 30 psi.
This COMBOMAX
MC electric boiler is designed
for a maximum operating temperature of 190°F.
It is designed as a hot water heating system
only. A 30 to 50% water and ethylene- or
propylene-glycol blend is allowed.
3.2 LOCATION
The COMBOMAX MC water heater should be
installed in a clean, dry location. Long hot water
lines should be insulated to conserve water and
energy. The water heater and water lines should
be protected from exposure to freezing.
COMBOMAX
MC
water heaters must be installed
vertically. Use the adjustable feet to level the
unit.
The COMBOMAX
MC
water heater must be
located or protected so as not to be subject to
physical damage, for example, by moving
vehicles, area flooding, etc..
All models can be installed on combustible floors
and in alcoves. If the water heater is to be
installed in a restaurant or other location where
the floor is frequently cleaned, it must be
elevated to provide at least 6 inches of
clearance from the floor to comply with NSF
International recommendations.
The room temperature must not exceed 80°F or
27°C.
3.3 CLEARANCE
The minimum clearances required for proper
inspection and servicing are as follows:
Table 4: Clearances
Left side 3 inches
Right side 3 inches
Top 24 inches
Front 24 inches
Back 3 inches
3.4 SYSTEM SETUP
Figures 2, 3 and 4 are general connection
diagrams including the circulator, the expansion
tank, the drain cock, the safety valve, the air
bleeder, the flow check valve and the thermo
manometer. Set-up details follow.
3.5 HEATING WATER CIRCUIT
3.5.1 Connecting the heating water
piping
The boiler may be set up alone or in parallel with
others. Parallel connections should be made
using the reverse-piping method to ensure equal
flow through each boiler.
The boiler water supply connector is located on
top of the boiler and the boiler water return
connector is located to the left of the three-way
valve. They are both threaded NPT female
connectors.
Unions are recommended on the hot and cold
water lines to disconnect the water heater easily
for servicing if necessary.
Dielectric (insulating) unions are required for
protection of the water heater if copper-steel
connections are made.
Use only clean copper or approved plastic pipe
for water connections. Local codes or
regulations shall govern the exact type of
material to be used.
Insulate all pipes containing hot water,
especially in unheated areas.
WARNING !