Hoshizaki 73168 service manual Rail Cooling

3. Rail Cooling

Problem		Possible Cause				Remedy
[1]	Rail temperature too	a) Warm Food		1.	Warm food recently	1.	Pre-cool food or allow time
	high.				placed in rail area.		for unit to return to setpoint
							temperature.
		b) Rail Pans/Dividers		1.	Missing, not in place.	1.	Replace. Pans must cover
							entire rail for proper cooling.
		c) Outside Heat Source		1.	Too close to unit.	1.	Separate unit from heat
							source.
		d) Rail Switch		1.	"OFF" position.	1.	Move to "NORMAL" or
							"LOW" position.
				2. Bad contacts.		2. Check for continuity and
							replace.
		e) Rail Thermistor		1.	Defective.	1.	See "II.E. Thermistor
							Check."
		f)	Setpoint and/or	1.	Incorrect.	1.	Correct setting(s).
			Temperature				See "II.D.4.c) Temperature
			Correction Factor				Setpoint" or
							"II.D.4.f) Temperature
							Correction Factor" for
							defaults.
		g) Air Filter or Condenser		1.	Clogged, dirty.	1.	Clean.
		h) Rail Liquid Line Valve		1.	Does not open.	1.	Check and replace.
		i)	Service Valve(s)	1.	Partially or completely	1.	Confirm service valve is
					closed.		open.
		j)	Refrigerant	1.	Leak.	1.	Recover, repair leak,
							replace drier, evacuate, and
							recharge.
		k) Expansion Valve		1.	Operating erratically.	1.	Check and replace.
		l)	Compressor	1.	Defective.	1.	See "1.[3] Compressor will
							not start or stops operating."
		m)Control Board		1.	Defective.	1.	Replace.
[2]	Rail temperature too	a) Setpoint and/or		1.	Incorrect.	1.	Correct setting(s).
	low.		Temperature				See "II.D.4.c) Temperature
			Correction Factor				Setpoint" or
							"II.D.4.f)Temperature
							Correction Factor" for
							defaults.
		b) Frozen Food		1.	Frozen food recently	1.	Allow time for unit to return
					placed in refrigerator.		to setpoint temperature.
		c) Rail Thermistor		1.	Defective.	1.	Check and replace.
		d) Rail Liquid Line Valve		1.	Does not close.	1.	Check and replace.
		e) Rail Fan Motor		1.	Defective.	1.	Check and replace.
		f)	Control Board	1.	Defective.	1.	Replace.

36