HTP MC120 - Manual (Page 61)

61
LP-171 Rev. 4.10.14
3. Fill condensate trap with water.
4. Verify electrical connections are correct and securely attached. Inspect exhaust vent and intake piping for signs of deterioration from
corrosion, physical damage or sagging.
PART 12 – START-UP PROCEDURE
FOR YOUR OWN SAFETY READ BEFORE OPERATING
1. This heater does not have pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the
burner by hand.
2. BEFORE OPERATING: smell all around the heater area for gas. Be sure to smell next to the floor because some gas is heavier than
air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS

Do not try to light any heater.

Do not touch any electric switch; do not use any phone in your building.

Immediately call your gas supplier from a neighbor's phone. Follow the gas suppliers' instructions.

If you cannot reach your gas supplier, call the fire department.

Turn off gas shutoff valve (located outside of the heater) so that the handle is crosswise to the gas pipe. If the handle will not
turn by hand, don't try to force or repair it, call a qualified service technician. Force or attempted repair may result in a fire or
explosion.
4. Do not use this heater if any part has been under water. Immediately call a qualified service technician to inspect the heater and to
replace any part of the control system and any gas control that has been damaged.
5. The heater shall be installed so the gas ignition system components are protected from water (dripping, spraying, rain, etc.) during
heater operation and service (circulator replacement, condensate trap, control replacement, etc.)
Failure to follow these instructions could result in property damage, serious personal injury, or death.
A. OPERATING INSTRUCTIONS
Remove heater cover. If you smell gas, STOP. Follow listed safety instructions. If
you do not smell gas, follow the next steps.
1. Turn on all electric power to heater.
2. If desired, adjust the temperature set point of the heater. The factory default
setting is 180
o F. If changes are necessary follow “Adjusting the Set point” in this
section.
3. Set the thermostat to the desired setting.
4. If the heater
fails to start, refer to the “Troubleshooting” section in the back of
this manual.
B. ADJUSTING THE SET POINT
1. Before changing the temperature from the factory setting of 180 degrees, you must make sure that none of the thermostats are call-
ing for heat. The controller will not memorize a program setting while in a heating cycle.
To adjust the heater temperature simply press in the
{S3} key for three seconds until you see a flashing (C) then an alternate value of
(180). This number is the factory set point of the unit, which is 180 degrees. To change the temperature, simply push either {S1} or {S2}
on the display. {S1} decreases and {S2} increases the heater temperature. The temperature of the heater can be set as low as 50
Degrees or as high 180 Degrees. These ranges are your minimum and maximum heater temperature ranges.
In addition to changing the temperature, you may also change three more settings in this model: 1. heater differential, 2. indirect setting
(with Vision System option), and 3. Celsius to Fahrenheit measurement. Simply press
{S3} to get to next value, the heater differential
setting will appear in the display ch and alternating value of 30. This allows the installer to adjust the activation of the burner based on
the differential temperature setting of the heater. The burner will not start until the outlet water temperature reaches a temperature
equal to the setting for the heater, minus the differential EX: The heater is set to heat at 180°F degrees and the differential is set at
30°F. The burner will not start until the outlet temperature of the system reaches 149°F degrees (180°
– 30°F = 150°F).