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SECTION 9: M
ULTIBURNER
 H
EATER
 I
NSTALLATION
  
29
9.2 Multiburner System Design Requirements
A CTHN multiburner system has a number of radiant 
tube sections interconnected by manifold tube to a 
pump to form a complete system. Reflectors can be 
used over the manifold tube but are not required.
The system design parameters are such that the 
manifold sections are not subjected to condensate 
when the system is fully heated up. It is required that 
heat-treated aluminized or coated tubing is used for 
the manifold to increase system life and to handle 
initial condensation during start-up. Damper 
couplings may be necessary to balance system 
vacuum. 
Design requirements for a CTHN multiburner system 
are summarized on Page 30, Table 10.
CTHN multiburner heaters are typically shipped as 
burner packages and tube and accessory packages. 
The tube and accessory packages contain enough 
tube, reflector and hanging parts for the radiant 
section of one CTHN heater. Elbows, tees, manifold 
tube, pumps, controls, damper couplings and any 
other parts used beyond the burner, radiant tube and 
reflector must be purchased separately. See Figure 
18
 for a general overview of a simple CTHN 
multiburner system. Depending on system 
requirements, CTHN multiburner systems may be 
controlled by either a ROBERTS GORDON
®
 System 
Control (shown) or by a relay system.
FIGURE 18: Typical CTHN Multiburner System Installation
T
T
Pressure Switch
System Control (optional)
Pump
Exhaust to
Outside
Drawing Not to Scale
Zone 2 Thermostat
Zone 1 Thermostat
Cross
Tee
Radiant Tube
Manifold Tube
Optional Reflector
Burners
Turbulator (if required)