Heating Frosting Revision Factor; Model Selection And Installation; Notices For Model Selection - Gree GMV-S120WL/A-S Service Manual

4) Hm: Height difference (m) between two units when indoor unit is in higher powition of
outdoor unit;
5) L: One way equivelent pipe length

7.7 Heating frosting revision factor

When outdoor environment satisfies certain conditions (temperature and humidity conditions),
unit may appears frosting or defrosting situation, which will weaken heating capacity of whole unit,
thus please calculate frosting revision factor for heating load model selection.
Frosting revision factor is as below:
Air inlet dry bulb
temperature of outdoor
heat exchanger
（℃/RH85%）
Revision factor of whole
unit (defrosting) capacity
8. Product Model Selection

8.1 Notices for model selection

8.1.1 Model selection and installation

Item
This unit must connect to indoor unit of
air conditioner, and total rated capacity
of indoor unit should account for
80%~100% of rated capacity of outdoor
For design and installation of
embedding pipe of floor heating:
clearance between floor heating pipes
should be within 100~150mm, and pipe
Model
diameter should be as large as possible
selection
within the selectable range (it is
and
recommended to be over DN20);
installation
Floor heating should be controlled by
different rooms, and install floor heating
shunt valve (floor heating performer).
Floor heating can be controlled for
designated room. New generation hot
water generator can directly control floor
heating shunt valve, for specific
operation can refer to instruction manual
of hot water generator.
GMV5 Home DC Inverter Multi VRF Units
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Contents
unit
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Instruction
If it's too low, it will impact defrosting effect, and if it's
too high, it will increase energy consumption of heating
water in winter;
1. Heat pump belongs to low-temperature heat source,
the water yielding temperature can be 35~40° C under
high energy efficiency. So when designing floor
heating, please do not design according to centralized
heating of boiler.
2. If clearance between floor heating pipes is too large,
and pipe diameter is too small, it will increase heat load
and water resistance, which will cause low heat
exchange efficiency and increase of energy
consumption.
It can avoid turning on floor heating of all the rooms.
This function is energy-saving.
34
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