York DHG180 Installation Instruction

Also see for SUNLINE DHG 180: Installation instruction

York DHG180 Installation Instruction Manual pdf 11 page image

035-17233-000-C-0702Unitary Products 11Check all connections for leaks when piping is completed,using a soap solution. NEVER USE A FLAME.VENT AND COMBUSTION AIR HOODSTwo vent hoods and a combustion air hood (with screens) areshipped attached to the blower housing in the blower com-partment. These hoods must be installed to assure properunit function. All hoods must be fastened to the outside of thegas heat access panel with the screws provided in the bagalso attached to the blower housing.The screen for the combustion air intake hood is secured asshown on the label attached to the hood. The top flange ofthis hood slips in under the top of the access panel openingwhen installing. Refer to Figure 8.Each vent hood is installed by inserting the top flange of thehood into the slotted opening in the access panel and secur-ing in place.OPTIONAL ECONOMIZER/MOTORIZED DAMPERRAIN HOODThe instruction for the optional economizer/motorizeddamper rain hood can be found in form 44-320-2. Use theseinstructions when field assembling an economizer rain hoodonto a unit.The outdoor and return air dampers, the damper actuator, thedamper linkage, the outdoor and return air divider baffles,and all the control sensors are factory mounted as part of theFactory installed economizer option.ENTHALPY SET POINT ADJUSTMENTRemove the economizer access panel from the unit to checkthe following adjustments. Loosen but do not remove the twopanel latches.1. The enthalpy set point may now be set by selecting thedesired setpoint shown in Figure 9. Adjust as follows:• For a single enthalpy operation, carefully turn the setpoint adjusting screw to the A, B, C or D setting corre-sponding to the lettered curve.• For a dual enthalpy operation, carefully turn the set pointadjusting screw fully clockwise past the D setting.2. To check that the damper blades move smoothly withoutbinding, carefully turn the minimum position adjustingscrew fully clockwise and then energize and de-energizeterminals R to G. With terminals R to G energized, turnthe minimum position screw counterclockwise until thedesired minimum position has been attained.3. Replace the economizer access panel. Reposition thetwo latches horizontally and retighten the screws.POWER EXHAUST/BAROMETRIC RELIEF DAMPERAND RAIN HOOD OPTIONThe instructions for the power exhaust/barometric reliefdamper and rain hood can be found in form 44-320-10. Theexhaust fan, all supporting brackets, angles, and the wiringare factory installed as part of the power exhaust option.All of the components, including the dampers, hardware, andmounting instructions are shipped in a single package exter-nal from the unit. The hood must be field assembled andinstalled.Power exhaust is not available as a field installed option.FIGURE 8 : VENT AND COMBUSTION AIRHOODSVENT AIROUTLETHOODSSLOTTEDOPENINGS INACCESS PANELCOMBUSTIONAIR INTAKEHOOD GAS HEATACCESSPANELSExtreme care must be exercised in turning boththe setpoint and minimum position adjustingscrews to prevent twisting them off.