MTZ 1220.1, Operator'S Manual

Page: 47 / 244

MTZ 1220.1/1220.3 Section D . Operation controls and instruments
D27
Cab air conditioning and heating
system
If it is installed instead of a heater fan
Climate system control in air condi-
tioning mode
The climate system control panel is in
the central part if cab upper panel.
Control console has the switches (1)
and (2)
By means of air flow switch (1) you
can change air consumption by means
of fan operating speed change. By
means of air flow switch (2) you can
change temperature of the air coming
from cool and dehydrated air deflector in
air conditioning mode.
ATTENTION: air conditioner can be
turned on and operate only when the
engine is running
To turn on the conditioner, proceed
as follows:
- turn the switch (2) (Figure 2.7)
clockwise by 180°C to the beginning of
the blue scale;
- - then turn the switch (1) to one of
the three marked positions (the fan im-
peller has three speeds). In 3-5 mi-
nutes, use the switch (2) to adjust the
desired temperature in the cab;
- with the shutters located on the
upper panel, near to the operator's
head, the mix of external and recircu-
lating air can be adjusted;
To turn off the air conditioner turn
both switches (1) and (2) counter-
clockwise to “0”.
ATTENTION: when working in the
cooling mode, the heater valve must
be closed to prevent simultaneous op-
eration of the air heating and cooling
systems.
Climate system control in heating
mode
ATTENTION: REFILL THE ENGINE
COOLING SYSTEM ONLY WITH AN
ANTIFREEZE AGENT.
For efficient operation of the
heating system, observe the following
recommendations:
1. After refilling the cooling system
with antifreeze agent, start the engine
and, without opening the valve, let the
engine work at medium speed to have
the antifreeze agent in the cooling sys-
tem warmed up to 70 to 80°
С , after
that open the valve, increase the en-
gine speed and let it work for 1 to 2
minutes to have the heat exchanger
filled with the agent. Make sure that the
antifreeze agent is circulating through
the heater. The heat exchanger must
warm up. The coolant level in the heat
exchanger of the engine cooling sys-
tem will drop at that;
2. Add coolant to the diesel engine
heat exchanger to the required level (to
the MAX. mar on the expansion tank);
3. To have the cab quickly warmed
up, turn on the heater fan and open the
recirculation shutters;
4. To discharge the coolant from the
engine heater and cooling system, in-
stall the tractor on an even surface.
Remove the extension tank plug of the
engine cooling system, open the valve
on the cylinder block of the engine and
remove the heater hose from the hea-
ter valve.
ATTENTION: when working in the
heating mode, the switch 2 must be
fully off to prevent simultaneous opera-
tion of the air heating and cooling sys-
tems.