Cook HMD EN Manuel d'utilisateur télécharger pdf (Page 6)

left to right. Use a screw driver on top of modular

gas valve. While monitoring the unit’s temperature

rise, set the maximum ring rate by adjusting the

regulator until the designed temperature rise is

achieved. After setting the maximum ring rate,

reconnect the wire to the amplier. Do not set the

burner maximum ring rate based on gas pressure.

It should be set based on the unit’s designed

temperature rise shown on the label. Setting the

maximum ring rate during mild weather conditions

may cause the high limit to trip out during extreme

conditions requiring manual resetting. Gas trains

are equipped with a combined regulator valve.

Clockwise rotation increases the temperature

rise; counterclockwise rotation decreases the

temperature rise. The minimum setting for the

maximum ring rate may be higher than required.

This is acceptable, the burner will modulate as

needed. To convert from Natural Gas to LP or vice

versa follow the instructions associated with the

high re gas valve.

5. Set the operating temperature.

Maintenance - All year

V-Belt Drives

NOTICE! Do not pry belts on or off

the sheave. Loosen belt tension

until belts can be removed by

simply lifting the belts off the

sheaves. When replacing

V-belts on multiple groove

drives, all belts should

be changed to provide

uniform drive loading.

Do not install new belts

on worn sheaves. If the

sheaves have grooves

worn in them, they must be replaced before new

belts are installed.

method downstream of the blower. Changing the air

volume can signicantly increase the motor’s amps.

If the air volume is changed, the motor’s amps must

be checked to prevent overloading the motor. To

ensure accuracy, the dampers are to be open when

measuring the air volume.

9. Adjust the settings on the optional components.

See the Control Center Layout in the Reference

section for location of optional components.

• Heating Inlet Air Sensor

Typical setting: 60-70ºF

• Building Freeze Protection

Typical setting: 45ºF

• Dirty Filter Gauge

Typical setting: Settings vary greatly for each unit.

Gas

1. Check the supply gas pressure and compare it with

the unit’s nameplate pressure requirements. Adjust

the supply regulator as needed until the supply gas

pressure is within the specied range (see below).

The nameplate is located on the outside of the unit

on the control panel side.

2. Check the settings on the optional high and low

gas pressure switches. The high pressure setting is

typically 8 inches wc (2 kPa) and the low pressure

is setting is typically 3 inches wc (0.7 kPa). The

switches are set at the factory and should not need

adjustment. Adjust the setting only if needed. The

purpose of the high and low gas pressure switches

is to automatically shut down the burner if the inlet

gas pressure is too low for the burner to safely

light, or if the manifold pressure is too high for the

burner to operate properly. Proper air velocity over

the burner is critical on direct red gas units. If the

air velocity is not within the unit specications, the

unit will not operate efciently, may have sporadic

shutdowns, and may produce excessive carbon

monoxide (CO) or other gases.

3. With all access panels in place, the fan running

and discharging 70ºF (21ºC) air, connect a U-Tube

manometer to the outer sensing probes and

measure the static pressure across the burner.

The proper static pressure should be (check CFM /

Static Pressure chart on page 8). If needed, evenly

adjust the bafes, keeping the burner centered in

the opening until the required pressure is obtained.

The pressure drop was set at the factory and may

not need adjustment. When required pressure is

obtained, be sure to reconnect the outer sensing

probes. This process may need to be repeated until

the proper pressure is achieved. This adjustment

will change the air quantity delivered by the unit

and therefore the air quantity delivered should be

rechecked. Refer to the Blower Start-Up section.

• To increase static pressure decrease the opening.

• To decrease static pressure increase the opening.

4. Monitor the unit’s actual temperature rise by placing

a thermocouple in the unit’s inlet and a second in

the discharge, three duct diameters downstream

of the burner. Send the unit to maximum ame

by changing the rotation of the motor pack from

1 foot

1/4 inch

Tolerance

Center Distance Maximum Gap

Up thru 12” 1/16”

12” up through 48 1/8”

Over 48” 1/4”

1 2 3 4 5 6 7 8 9 10 11 ... 15 16

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Cook HMD EN Manuel d'utilisateur Page 6

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