Bryant TSTATBBN2S01-C Instalační manuál stáhnout pdf (Strana 27)

Page 27

Start up Procedure

When the disconnect switch is closed, high

voltage is present in some areas of the electrical

panel. Exercise caution when working with

energized equipment.

Turn thermostat fan position to “ON”. Blower should start.

2. Balance air ﬂ ow at registers.

3. Adjust all valves to their full open position. Turn on the

line power to all heat pump units.

4. Operate unit in cooling cycle. Room temperature should

be approximately 45-100°F DB. For Start-up check,

loop water temperature entering the heat pumps

should be between 40°F and 90°F.

5. Two factors determine the operating limits of a GT-X

System– (a) return air temperature, and (b) water

temperature. When any one of these factors is at a

minimum or maximum level, the other factor must be

at normal levels to ensure proper unit operation.

a. Adjust the unit thermostat to the coolest position.

Slowly reduce thermostat setting until the

compressor activates.

b. Check for cool air delivery at the unit grille within

a few minutes after the unit has begun to operate.

Note: Units have a ﬁ ve minute time delay in the

control circuit that can be eliminated on the

CXM PCB as shown below in Figure 24. See

controls description for detailed features of the

control.

c. Verify that the compressor is on and that the water

ﬂ ow rate is correct by measuring pressure drop

through the heat exchanger using the Peteʼs plugs

and comparing to Table 12.

d. Check the elevation and cleanliness of the

condensate lines. Dripping may be a sign of a

blocked line. Check that the condensate trap

includes a water seal.

e. Refer to Table 11. Check the difference in

temperature of supply and return water

temperature, usually referred to as Delta-T Water.

If Delta-T Water is outside the range shown in

table 11, check cooling refrigerant pressure in

table 13. Verify correct water ﬂ ow by comparing

unit pressure drop across the heat exchanger

versus the data in Table 12. Heat of rejection

can be calculated and compared to the

speciﬁ cation catalog.

f. Check air temperature drop across the coil when

compressor is operating. Air temperature should

drop between 15°F and 25°F.

g. Turn thermostat to “OFF” position. A hissing

noise indicates proper functioning of the

reversing valve.

6. Operate the heat pump in the heating cycle

immediately after checking cooling cycle operation.

Allow ﬁ ve (5) minutes between tests for pressure to

equalize or cycle the reversing valve to equalize.

a. Turn thermostat to lowest setting and set

thermostat switch to “HEAT” position.

b. Slowly turn thermostat to a higher temperature

until the compressor activates.

Check for warm air delivery at the unit grille within a

few minutes after the unit has begun to operate.

d. Check the temperature of both supply and

discharge water. Refer to Table 11. If temperature

is within range, proceed with test. If temperature

is outside operating range, check heating

refrigerant pressures in Table 13.

Check air temperature rise across the coil when

compressor is operating. Air temperature should rise

between 20°F and 30°F. Heat of extraction

can be calculated and compared to

speciﬁ cation catalog.

f. Check for vibration, noise, and water leaks.

7. If unit fails to operate, perform Troubleshooting

analysis. If the check described fails to reveal the

problem and the unit still does not operate, contact a

trained service technician to ensure proper diagnosis

and repair of the equipment.

8. When testing is complete, set system to maintain

desired comfort level.

9. BE CERTAIN TO FILL OUT AND FORWARD

ALL WARRANTY REGISTRATION PAPERS TO

THE MANUFACTURER.

Note: If performance during any mode appears

abnormal, refer to the troubleshooting section. To

obtain maximum performance the air coil should be

cleaned before start-up. A 10% solution of dishwasher

detergent and water is recommended.

Short test pins together

to enter Test Mode and

speed-up timing and

delays for 20 minutes

Figure 24. Test Mode Pins

CXM Board

WARNING

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