Instruction manual

39
5 REGULATING THE DOMESTIC
HOT WATER
The heater temperature control knob is
adjusted to its lowest temperature position
when shipped from the factory. Prior to
starting heater, it should be adjusted to a
starting point of 120°F as shown on the
thermostat. After installing the space/water
heater, it is necessary to regulate the flow
rate of the domestic hot water so as to give
a 75°F rise. For this function, you need to
use a flow meter and a thermometer. Place
the flow meter, under a hot water faucet,
closest to the heater and open the faucet
until water temperature is stabilized. The
difference between cold and hot water
should be approximately 75°F. Increase or
decrease the water flow by regulating the
incoming cold water to the heater with the
DHW flow restrictor.
In any case, it is necessary to install a
mixing valve external of the heater.
6 BURNER
The burner, depicted below, is made of
stainless steel and can be used with both
Natural Gas (NAT) or Propane Gas (LP).
6.1 Changing the Gas Type
To convert the heater from one gas type to
another (NAT to LP or LP to NAT). Conversion
kits are available at an additional cost..
6.2 Adjusting Gas Flow and
Pressure to the Burner
The gas pressure is calibrated in the factory.
If any corrections are needed use a
manometer and adjust the pressure
according to Table 1 (back of manual).
Please refer to Figure 22, below.
Loosen the screw (B) on the bottom of the
burner and place one of the manometer tubes
on (B). Turn the burner on and compare the
pressure found with the value given in Table
1. If any adjustments are needed remove
the protection cap (A) and turn the burner
pressure adjustment screw until the value
given in Table 1 is reached. (Turn the screw
clockwise to increase the flame and counter-
clockwise to decrease it). Tighten the screw
that closes the burner gas pressure (B).
Fig.21 - Exploded view of the burner
A Burner unit fixing pin
B Manifold
C O-ring
D Nozzle
E Spacer
F Tie rod
G Burner unit
Figure 22 - Gas valve
A Burner pressure adjustment screw
(under cap screw)
B Burner gas pressure probe
C Gas control knob
D Inlet gas pressure probe
A INSTALLATION INSTRUCTIONS