Operator`s manual

PUREHEAT™ HYDRONIC AIR HEATER OPERATOR’S MANUAL – SECTION 2

2-7

2-8

2.4.2 Warming the Heat Transfer Fluid

1. Use the UP/DOWN arrow keys to adjust the temperature set-point on the TC to 70°F (21°C). (Refer to

Appendixes A-2 and A-3.)

2. Turn the BURNER Switch ON, then verify the following:

a. The Burner Motor starts (after a five second delay) and fires fifteen seconds later. If the Burner

fails to start, refer to Appendixes A-12 and A-13.

b. The Burner runs clean, quiet and with no

visible smoke. If the Burner operation is in question, a

qualified service technician should check Burner settings and emissions.

NOTE: Section 4.3, BURNER COMBUSTION VERIFICATION AND ADJUSTMENT, provides detailed

instructions for testing Burner emissions and settings.

2.4.3 Initiating Flow through Heat Transfer Hose

(Refer to Appendix B-1.)

1. Position the following valves as directed below:

a. OPEN the Suction Valve #3. (Photo 2-6)

b. Verify Cross-Connect Valve #5 is OPEN. (Photo 2-13)

c. Verify Return Valve #2 is fully CLOSED. (Photo 2-5)

2. Turn the PUMP Switch ON at the Main Control Panel until the Pump Motor has reached full RPM. The

Dashboard Pressure Gauge will read an approximate 50 psig. Slowly OPEN Return Valve #2, lowering

operating pressure, to a minimum of 30 psig on the Dashboard Pressure Gauge for optimum flow rate.

(Photo 2-8)

If ambient temperatures are below -

15ºF (-26ºC), you must

pre-heat the

Pump before turning the Pump ON.

3. Turn each Heat Xchanger™ BLOWER or FAN

Switch ON and verify the thermostat is at the

desired set point temperature. Output air

temperature will increase as the system warms

up.

NOTE: Blowers will not run if the Heat Xchanger™

thermostats are set too low.

4. Periodically verify proper system operation using

the dashboard gauges. Adjust Return Valve #2 so that the

Dashboard Pressure Gauge maintains 30 psig. Min. The Return

Flow Indicator should spin. The HTF return

temperature should

read approximately 40º to 50ºF (22º to 28ºC) less than the supply

temperature (red numbers on the Main Control Panel). (Photo 2-7

and 2-8)

5. Set the TC to temperature required for application.

NOTE: Always set the TC to 180°F (82°C) for thawing, frost prevention

and air heating applications. Concrete curing applications

usually require temperature settings below 180ºF (82ºC).