Master DMA18HOS20230E7 Cub Cased Coil Instruction Manual
- June 1, 2024
- MASTER
Table of Contents
Master DMA18HOS20230E7 Cub Cased Coil
specification
- Document ID : IAG_M_CUBX23_1_EN_FR
- Document Languages: English, French
- Product(s): DMAxxHOS20 + CUB CASED COIL
System Combinations
RHC (Rated Heating Capacity @47°F) MHC (Max Heating Capacity @5°F)
Dimensions
Piping Dimensions (Refrigerant Pre-Charge 25 ft)
Condenser Size (BTU/h)
| ****
18,000
| ****
24,000
| ****
30,000
| ****
36,000
| ****
48,000
| ****
60,000
---|---|---|---|---|---|---
Liquid / Gas mm (in.)
| ****
9.52 / 19 (3/8 / 3/4)
| 9.52 / 22
(3/8 / 7/8)
Max Line Set Length m (ft)
| 30
(98)
| 50
(164)
| 65
(213)
| 65
(213)
| 65
(213)
| 65
(213)
Max. Height Difference m (ft)
| 20
(66)
| 25
(82)
| 30
(98)
| 30
(98)
| 30
(98)
| 30
(98)
Minimum line set length is 15 ft. Additional refrigerant charge for line set lengths beyond 25 ft is 0.69 oz per foot.
Installation
Multiple Position Installation Options
- When installing the CUB coil in a downflow application or on an air handler of a different width, it is critical to use a minimum 4-inch transition as per the installation document shipped with the unit.
Control the system with any 24V 3H/2C heat pump thermostat sold by The Master Group.
- 10/B terminal: configure to energize as B.
- 2W2 terminal: A jumper from W1 to W2, or W2 can be wired for 2-stage furnace operation.
- Minimum recommended thermostat – 3H2C
- Thermostat Brands vary – always refer to the user settings in the product installation manual.
Note : The control wiring diagram shown is typical for a dual fuel application and permits 1st stage furnace operation to prevent blowing cold air during defrost. The thermostat must be configured to NOT allow simultaneous heat pump and furnace operation. Consult the manufacturer’s thermostat-specific literature for details. Proper wiring is crucial to the function of the system; refer to product-specific installation manuals for permissible wiring arrangements. Always adhere to local and national codes.\
Operation
Expected Operation
Condenser operation with A-coil + TXV and 24-Volt Thermostat
Cooling Operation
- When the condenser receives a Y1 call from the thermostat, it generates the demand for an evaporator Coil Temperature Target (CTT) of ~12°C; Y2 demand is ~7°C.
- The condenser suction temperature and pressure sensor are used to calculate the coil temperature (CT) and demand.
- The logic for operation is: Coil Temp (CT) – Y1 (12) or Y2 (7) =▲T
- A greater ▲T will result in higher compressor Hz.
- A smaller ▲T will result in lower compressor Hz.
- The suction pressure and pressure sensor in the condenser will control the compressor frequency
Heating Operation
- When the condenser receives a heat call of Y1 + B, the CTT is Y1 46°C and Y2 50°C. The parameters vary slightly by model.
- The refrigerant metering is done via EEV in the condenser when in heating mode. As the incoming air temperature and discharge pressure fluctuate, the compressor frequency modulates
Technical Support Reference – MP-Service
- Easy to access online support
- No account to create
- Access to all error codes and unit status
- Test sequences available
- Also available at https://mp-service.vip
Note: When using the MP-Service support site it is critical to correctly enter the complete model or serial number. Failure to enter either number correctly and or incompletely will result in a “service paused” error message. Re-enter the model or serial number correctly and completely to view the related error codes and troubleshooting guides. The final page of this document contains a summary of error codes for quick reference. Refer to product-specific literature for additional and complete information.
Disclaimer
This document is intended to provide customers with basic information a glance
at the listed product(s). This basic guide is not exhaustive in scope and is
not to be used as the sole source of information for installation. It should
be used in conjunction with product-specific manuals as applicable.
Specifications are subject to change without notice. It is the installing or
servicing contractor’s responsibility to follow all local and national codes
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