62
12.1.2 Use with glycol/water mix: If P52 < its standard adjustment value based on the refrigerant type:
1) Heater control:
- If exchanger ambient temperature and water inlet temperature ≤
P52 + 2 K + all compressors off + pump off if P25 ≠ 0 → Heaters on.
- If exchanger ambient temp. sensor fault and water inlet
temperature ≤ P52 + 2 K + all compressors off + pump off
if P25 ≠ 0 → Heaters on.
- If exchanger ambient temperature P265 or water inlet
temperature > P52 + 2 + P222 or if a compressor or a pump is on
if P25 ≠ 0 → Heaters off.
2) Heat trace cable control:
- If outdoor temperature ≤ 0 and water inlet temperature ≤ 0°C +
all compressors off + pump off if P25 ≠ 0 → Heaters on.
- If outdoor temperature sensor fault and water inlet temperature ≤
0°C + all compressors off + pump off if P25 ≠ 0 → Heaters on.
- If outdoor temperature > 0 + P222 or water inlet temperature
≥ 0°C + P222 or if a compressor or a pump is on if P25 ≠ 0 →
Heat trace cables off.
Output state displays:
12.1.3 Controlling frost protection for partial recovery (desuperheater) or total recovery option:
Parameter visible only if P2 (unit type) = air-to-water or reversible air-to-water:
Default value:
- No if P29 (total recovery) = No
- Yes if P29 = Yes
- If P29.1 = Yes and outdoor temperature ≤ P220: heat trace cables on
- If P29.1 = Yes and outdoor temperature sensor fault: heat trace cables on
- If P29.1 = Yes and outdoor temperature > P220 + P222: heat trace cables off.
The heat trace cables will be controlled by output 4 on terminal block J5 on additional board 1 (1-circuit cycle reversal). If P29.1 is set to „Yes‟
and the link with ADDitional board 1 is missing, a link fault should appear.
Output state display:
12.2 Water loop winter protection
In heating mode:
This function is possible only if P142 = Yes, the automatic
operation control input is open and the On/Off button on the
console is set to „On‟.
In this case the function must maintain water inlet temperature on
the heat exchanger at 30°C as soon as the outdoor temperature
falls below 3°C (2 K differential).
The return temperature will be maintained at 30°C if the outdoor
temperature sensor ever malfunctions.
In cooling mode:
This function is possible only if P142 = Yes, the automatic
operation control input is open and the On/Off button on the
console is set to „On‟. In this case the pump is turned on if the
outdoor temperature falls below P220 and shut off at P220 + P222.
The pump will be forced on if the outdoor temperature sensor
ever malfunctions.
13 MANAGEMENT OF THE FUNCTIONS
13.1 Management of the compressor protections
13.1.1 Short-cycle protection:
Information from compressor manufacturer:
Compressors are not allowed to start more than 12 times an hour
(on/off time of 5 minutes and minimum of 3 minutes between starts).
The on time + off time will be adjustable via parameter P50.
The auxiliary heaters do not operate during short-cycle protection.
On power-up, the SCP = 0 minutes and the minimum off time =
3 minutes.
In test mode, the short-cycle protection is shunted. The compressor can start up immediately at the end of the pump start-up time delay.
The information is displayed only if a call is made to turn on the stage while the time delay is counting down.
P 4 3 5 H E A T T R A C E
C A B L E O U T P U T O N
P 4 3 6 H E A T E R
O U T P U T O N
P 2 9 . 1 H E A T R E C O V . E X C H .
F R O S T P R O T E C T I O N Y E S
P 4 3 7 R E C O V E R Y F R O S T
P R O T . O U T P U T O N
S H O R T - C Y C L E P R O T E C T I O N
S T A G E x C I R x x x m n x x s
S T A G E x C I R C U I T x A T
M I N . S T O P x x m n x x s
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