Bosch BOVA-36HN1-M18M Manuel d'utilisateur télécharger pdf (Page 22)

Bosch IDS BOVA Installation Instructions

12.2016 | Bosch Thermotechnology Corp.Data subject to change

 Manual Defrost:

1. System must have a call for heat and have been operating for a minimum

of 8 minutes.

2. Press “Force” button on inverter board for 6 seconds to begin forced

defrost.

3. Wait approximately 40 seconds for defrost to initiate.

4. Once defrost initiates, the display will indicate “dF”.

5. Defrost test will terminate automatically, after which the display will

indicate running speed.

6. If a second defrost test is required, repeat step 3 after 5 minutes.

15.4 Compressor crankcase heater description

Refrigerant migration during the OFF cycle can result in noisy start-ups, therefore

a crankcase heater (CCH) is used to minimize refrigerant migration thereby

minimizing start-up noise and/or bearing “wash out”. All CCHs must be installed

on the lower half of the compressor shell. Its purpose is to warm the compressor

on the OFF cycle, driving refrigerantfrom compressor. At initial start-up or after

extended shutdown periods, allow CCH to be energized for at least 12 hours prior to

compressor operation by applying line voltage to heat pump with thermostat OFF.

 CCH operation energizes:

1. First time line voltage is applied and compressor discharge temperature T5 <

104°F.

2. In process of defrosting.

3. Compressor stops running for 4 hours and outdoor ambient temperature T4 <

50°F or T5 < 104°F.

 CCH operation de-energizes:

1. Compressor discharge temperature T5 ≥ 113°F.

15.5 Reversing valve operation

 Reversing valve energizes during heat mode and de-energizes in cool mode.

15.6 Protection functions

 Outdoor coil temperature protection (T3)

i. If T3 > 143.6°F, compressor is de-energized

ii. If T3 < 129.2°F, compressor is energized

 Ambient temperature protection (T4)

i. If 50°F ≤ T4 < 140°F, unit can ope rate in cooling

ii. If -4°F ≤ T4 < 86°F, unit can operate in heating

iii. If T4 < 6.8°F, heat pump will provide 24V control to indoor unit

energizing electric heat (if installed).

 Discharge Temperature (DT) protection (T5)

i. If DT > 239°F during cooling mode, the compressor will stop.

ii. If DT < 194°F during cooling mode, the compressor will restart.

iii. If DT > 221°F during heating mode, the compressor will stop.

iv. If DT < 167°F during heating mode, the compressor will restart.

 High pressure protection (HPS) (mechanical open/close pressure switch)

i. HPS opens at P > 580 PSIG, the compressor and outdoor fan stop.

ii. HPS closes at P < 435 PSIG, the compressor and outdoor fan restart.

 Low pressure protection (LP)

i. If Low Pressure < 43.5 PSI for 5 minutes during cooling mode, the

compressor and outdoor fan will stop.System will attempt to run again

after 6 minutes.

 Module (inverter) protection (TF)

i. If TF > 176°F, the compressor and outdoor fan will stop.

ii. If TF< 145°F, the compressor and outdoor fan will restart.

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Bosch BOVA-36HN1-M18M Manuel d'utilisateur Page 22

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