Electric, Steam and Hot Water Start-Up

Damper Installation

When a unit is ordered with the low ambient option (i.e., Digit 19 is a “1” in the model number), a damper is factory installed over the condenser fans 2B1, 2B4, 2B13 & 2B14 (depending on unit size). Refer to the illustration in Figure 4-1 for the damper locations.

For field installation, mount the dampers over the con- denser fans at the locations shown in Figure 4-1 and con- nect the actuator for each circuit. (Refer to the Installation Instructions provided with each kit.)

Damper Adjustment (Factory or Field Installed)

The UCM has a factory default setpoint of 90 F. This set- point can be adjusted using the Human Interface program- ming procedures.

Inspect the damper blades for proper alignment and opera- tion. Dampers should be in the closed position during the "Off" cycle. If adjustment is required;

1.At the Human Interface, program the actuator for 0% on circuit #1 and/or circuit #2. (The output signal will go to

0.0VDC.)

2.Loosen the damper shaft "Locking" set screws on the ac- tuator

3.Firmly hold the damper blades in the closed position

4.Retighten the "Locking" set screws.

To check damper operation, program the actuator for 100% on circuit #1 and/or circuit #2. (The output signal will go to 10 VDC and the damper will drive to the full open position.

(Constant Volume & Variable Air Volume Systems)

1.Ensure that the "System" selection switch at the remote panel is in the "Off" position.

2.Close the disconnect switch or circuit protector switch that provides the supply power to the unit's terminal block 1TB1 or the unit mounted disconnect switch 1S14.

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote discon- nects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvert- ently energized. Failure to disconnect power before ser- vicing could result in death or serious injury.

HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK 1TB1 OR UNIT DISCONNECT SWITCH 1S14.

3.Turn the 115 volt control circuit switch 1S1 and the 24 volt control circuit switch 1S70 to the "On" position.

4.Open the Human Interface access door, located in the unit control panel, and press the SERVICE MODE key to display the first service screen. Refer to the latest edition of the appropriate SAHF-PTG manual for CV or VAV ap- plications for the SERVICE TEST screens and program- ming instructions.

Unit Start-Up (Continued)

5.Use Table 4-1 to program the following system compo- nents for operation by scrolling through the Human Inter- face displays;

Electric Heat Supply Fan (On)

Inlet Guide Vanes (100% Open, if applicable) Variable Frequency Drive (100% Output, if applicable)

RTM Occ/Unocc Output (Unoccupied) Heat Stages 1 & 2 (On)

Steam or Hot Water Heat

Supply Fan (On)

Inlet Guide Vanes (100% Open, if applicable) Variable Frequency Drive (100% Output, if applicable)

RTM Occ/Unocc Output (Unoccupied)

Hydronic Heat Actuator (100% Open)

Open the main steam or hot water valve supplying the rooftop heater coils.

6.Once the configuration for the appropriate heating sys- tem is complete, press the NEXT key until the LCD dis- plays the “Start test in __Sec.” screen. Press the + key to designate the delay before the test is to start. This ser- vice test will begin after the TEST START key is pressed and the delay designated in this step has elapsed. Press the ENTER key to confirm this choice.

WARNING

Rotating Components!

During installation, testing, servicing and troubleshoot- ing of this product it may be necessary to measure the speed of rotating components. Have a qualified or li- censed service individual who has been properly trained in handling exposed rotating components, per- form these tasks. Failure to follow all safety precau- tions when exposed to rotating components could re- sult in death or serious injury.

7.Press the TEST START key to start the test. Remember that the delay designated in step 6 must elapse before the fan will begin to operate.

8.Once the system has started, verify that the electric heat or the hydronic heat system is operating properly by us- ing appropriate service technics; i.e. amperage readings, delta tees, etc..

9.Press the STOP key at the Human Interface Module in the unit control panel to stop the system operation.

Gas Furnace Start-Up

(Constant Volume & Variable Air Volume Systems)

It is important to establish and maintain the appropriate air/ fuel mixture to assure that the gas furnace operates safely and efficiently.

Since the proper manifold gas pressure for a particular in- stallation will vary due to the specific BTU content of the lo- cal gas supply, adjust the burner based on carbon dioxide and oxygen levels.